JP2015221443A - Spinning device, method od manufacturing tank mirror portion, method of manufacturing tank body portion, method of manufacturing tank, and tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning device capable of preventing a problem in a product shape due to the thermal expansion and the like of rollers, and manufacturing a product with high precision at a low cost.SOLUTION: While rotating a work 301, an inner surface and an outer surface of the work 301 are sandwiched by a molding roller 205 and a mold receiving roller 206 to be molded. A shape of a machined portion of the work 301 is measured by an optical profile measuring apparatus 100. On the basis of a relationship between dimensions of the machined portion of the work 301 and dimensions of a clearance between both rollers 205 and 206, tracks of both rollers 205 and 206 are corrected so as to make the clearance between both rollers 205 and 206 become a value corresponding to a target shape of the machined portion, thereby driving both rollers 205 and 206.

Description

  The present invention relates to a spinning device for forming a joint of a workpiece, a method for manufacturing a tank mirror, a method for manufacturing a tank body, and a tank.

  As a pressure vessel for storing a fluid therein, one manufactured by a metal thin plate or a composite material is known. Among these, a tank for a hot water storage type hot water heater is often used in which a plurality of members made of stainless steel plates are joined by means such as welding. As a manufacturing method of this type of tank, a cylindrical body is formed by welding two opposite sides after a flat plate is rolled and formed, while the flat plate is formed into a bowl shape by pressing such as drawing or overhanging. There is a method in which the mirror part is used as a mirror part and the peripheral part of the mirror part is welded to the openings at both ends of the body part over the entire circumference. Here, welding over the entire circumference of the opening of the body part and the peripheral part of the mirror part is called circumferential welding, and the joint part of the body part and the mirror part is subjected to spinning processing or the like for circumferential welding. A joint having an L-shaped or Z-shaped cross section is formed (for example, Patent Document 1).

  It is desirable to use a butt joint that does not have a gap in order to reduce the thickness and life of the water heater tank, but in general, a butt joint of a thin plate is a gap between two thin plates to be welded or in the thickness direction. A good butt joint cannot be obtained unless the displacement is strictly controlled. In order to obtain a good butt joint by circumferential welding of a water heater tank, it is necessary to strictly control the diameter of the body and the mirror and the dimensions of the joint before welding. In the spinning forming of such a joint, the roller is pressed from the inner surface or the outer surface of the member while rotating the body portion or the mirror portion, or the processing part of the member is sandwiched from the inner surface and the outer surface by two rollers. There is known a method of forming the shape.

  However, in spinning processing, the relative positional relationship between the roller and the processing member and the gap between the rollers that sandwich the processing member from the inner and outer surfaces change due to the atmospheric temperature and heat generated by the processing, which causes problems with the molded joint shape. There was a problem that occurred. Various countermeasures have been studied so far, such as cutting the opening end of a member (for example, Patent Document 2), the temperature of a die or roller of a spinning machine, or roller dimensions. Alternatively, a method of correcting the roller trajectory by monitoring the processing force (for example, Patent Document 3) has been proposed.

JP 2012-148304 A JP 2003-214539 A JP 2000-126826 A

  However, the joint forming method described in Patent Document 2 has a problem in that a cutting process is required to remove cutting chips and processing oil because cutting chips are generated.

  In addition, the spinning method described in Patent Document 3 measures the displacement of a die or a roller due to thermal expansion by various methods, and indirectly predicts the shape change of the product from the measurement information to determine the trajectory of the roller. Since this is a correction method, a prediction error overlaps with a measurement error, so that there is a problem that the correction error increases.

  For example, when a large number of products are processed continuously, not only the roller but also the structural member that supports the roller changes in temperature, affecting the position of the roller. In the first method of Patent Document 3, the temperature of the mold and the rotating surface of the roller is measured without contact, and the locus of the roller is corrected based on the measured value. However, since only the temperature change of the roller is measured, when the number of continuous production increases, the roller temperature rises to a certain temperature and reaches equilibrium, but the structural member that supports the roller having a larger heat capacity than the roller is delayed. Even if the temperature rises and the roller position changes accordingly, there is a problem that the correction for the change does not work.

  In the second method of Patent Document 3, the amount of displacement of the mold and the displacement of the radius of the processing roller are measured by a displacement sensor, and the track of the roller is corrected based on the measurement result. However, when the roller tip shape is an acute angle or the tip radius (R) is small, there is a problem that the displacement measurement error is large.

  In the third method of Patent Document 3, the force applied to the roller is measured by a measurement load cell, the locus data of the roller is automatically corrected based on the measured value, and the machining roller is driven along the corrected locus. However, since the force applied to the roller is affected by variations in the deformation resistance of the material, there is a problem that a correction error tends to occur.

  Furthermore, in the spinning method described in Patent Document 3, the correction amount is calculated in advance by experiments. However, it takes time until the thermal expansion changes of the roller and the mold reach equilibrium, and depending on the season, morning and evening Since the change rates are different, a large amount of prior experiment is required to calculate an appropriate correction amount, and there is a problem that a lot of experiment time and experiment cost are required.

  The present invention has been made in order to solve the above-described problems, and prevents spinning of a product shape caused by thermal expansion of a roller, and enables spinning with high accuracy at low cost. A processing apparatus is provided.

  A first spinning processing apparatus according to the present invention includes a rotating mechanism that rotates the workpiece while the workpiece is mounted on a jig, and a molding that forms the workpiece by sandwiching the workpiece of the workpiece from an inner surface and an outer surface. Roller and molding receiving roller, an optical profile measuring device for measuring the shape of the processed portion, and a measurement value of the optical profile measuring device is input, and the dimensions of the processed portion that are input in advance Based on the relationship between the dimensions of the gap between the rollers, the trajectory of the rollers is corrected so that the gap between the rollers has a value corresponding to the target shape of the workpiece. A controller that drives the rollers on a track is provided.

  The second spinning processing apparatus of the present invention is a molding mechanism for forming the workpiece by sandwiching the workpiece from the inner surface and the outer surface, and a rotating mechanism for rotating the workpiece while the workpiece is mounted on a jig. Roller and molding receiving roller, a transmissive laser sensor for measuring a gap between the two rollers, a measured value of the gap between the two rollers measured by the transmissive laser sensor, and the two rollers set in advance And a control unit that corrects the machining trajectories of the two rollers in accordance with the difference between the two gaps and drives the two rollers with the corrected machining trajectories.

  A third spinning processing apparatus according to the present invention includes: a rotating mechanism that rotates the workpiece while the workpiece is mounted on a jig; and a molding that forms the workpiece by sandwiching the workpiece from the inner surface and the outer surface. And a molding receiving roller, an optical profile measuring device that measures the position of the jig, and a transmission type laser sensor that measures the positions of the two rollers, and the measured position of the jig and the measurement The jig and the two rollers are positioned based on the positions of the two rollers.

The first tank mirror part manufacturing method according to the present invention includes a step of enlarging the diameter of the periphery of the opening of the workpiece by pressing a molding roller from the inner surface of the workpiece while rotating the workpiece molded in a bowl shape. ,
While rotating the work, the opening edge of the work is sandwiched and formed from the inner surface and the outer surface by a forming roller and a forming receiving roller, and the shape of the work portion of the work is measured with an optical profile measuring instrument, Based on the relationship between the dimension of the workpiece and the dimension of the gap between the rollers, the trajectory of the rollers is adjusted so that the gap between the rollers has a value corresponding to the target shape of the workpiece. And a step of forming an L-shaped joint or a Z-shaped joint at the opening edge of the workpiece by correcting and driving the both rollers along the corrected track.

  The first tank body manufacturing method of the present invention is formed by sandwiching the opening edge of the workpiece from the inner surface and the outer surface with a molding roller and a molding receiving roller while rotating the cylindrical molded workpiece, The shape of the workpiece part of the workpiece is measured with an optical profile measuring instrument, and the gap between the rollers is determined based on the relationship between the dimension of the workpiece and the dimension of the gap between the rollers. The trajectory of both rollers is corrected so as to have a value corresponding to the target shape, and the both rollers are driven by the corrected trajectory, so that a Z-shaped joint or L-shape is formed at the opening edge of the workpiece. A step of forming a joint.

The second tank mirror part manufacturing method of the present invention includes a step of enlarging the diameter of the periphery of the opening of the work by pressing a forming roller from the inner surface of the work while rotating the work formed in a bowl shape. ,
While rotating the workpiece, the opening edge of the workpiece is formed by being sandwiched between an inner surface and an outer surface by a molding roller and a molding receiving roller, and a gap between the two rollers is measured by a transmission laser sensor, and the transmission laser sensor The processing trajectory of both rollers is corrected according to the difference between the measured value of the clearance between the rollers measured by the above and the clearance between the rollers set in advance, and the rollers are moved in the corrected processing trajectory. And a step of forming an L-shaped joint or a Z-shaped joint at the opening edge of the workpiece by driving.

  The second tank body manufacturing method of the present invention is formed by sandwiching the opening edge of the workpiece from the inner surface and the outer surface with a molding roller and a molding receiving roller while rotating the cylindrical molded workpiece, The gap between the two rollers is measured by a transmission laser sensor, and the measured value of the gap between the two rollers measured by the transmission laser sensor and the difference between the preset gap between the two rollers are And a step of forming a Z-shaped joint or an L-shaped joint at the opening edge of the work by correcting the processing trajectories of both rollers and driving the both rollers with the corrected processing trajectories. .

  The tank of the present invention is a tank in which an opening of a bowl-shaped mirror part and an opening of a cylindrical body part are joined, and the diameter of the opening of the mirror part is increased in diameter. The diameter of the cylindrical cross section in the diameter expansion range is 0.5% to 1.3% larger than the diameter of the cylindrical cross section adjacent to the diameter expansion range.

  According to the first spinning processing apparatus of the present invention, the trajectory of both rollers is corrected from the result of optically directly measuring the shape of the workpiece, so that the product dimensions of the workpiece can be corrected with high accuracy. Can do. Further, if only the change rate of the dimension of the workpiece to the displacement of the roller trajectory is known in advance, the correction trajectory of the roller can be obtained, and there is an effect that the preliminary experiment for grasping the correction amount can be simplified.

  According to the second spinning processing apparatus of the present invention, the trajectory of both rollers is corrected from the direct measurement result of the gap between both rollers sandwiching the workpiece, so that the product dimensions of the workpiece can be corrected with high accuracy. Can do.

  According to the third spinning processing apparatus of the present invention, both rollers can be positioned in contact with each other. Therefore, when the rollers are brought into contact with the positioning jig, the roller is pressed too hard. This has the effect of preventing positioning errors.

  According to the manufacturing method of the tank mirror part and the tank body part of the present invention, based on the result of optically directly measuring the shape of the processed part or the result of direct measurement of the gap between both rollers sandwiching the processed part, Since the trajectory is corrected, the product dimension of the workpiece can be corrected with high accuracy.

  According to the tank of the present invention, the roundness of the peripheral edge of the joint between the mirror part and the body part is improved, and a tank with good dimensional accuracy can be provided.

1 is a plan view showing a spinning processing apparatus according to Embodiment 1. FIG. It is a top view which shows the state which mounted | wore the workpiece | work with the spinning processing apparatus of FIG. It is a side view which shows the roller unit of the spinning processing apparatus of FIG. FIG. 3 is an overall schematic diagram illustrating a workpiece forming process according to the first embodiment. It is a side view which shows another structural example of the spinning processing apparatus by Embodiment 1. FIG. FIG. 6 is a cross-sectional view for explaining a workpiece diameter enlargement process according to the first embodiment. 6 is a graph showing the relationship between the roundness of a workpiece and the diameter enlargement ratio according to the first embodiment. FIG. 6 is a diagram for explaining details of a workpiece diameter enlargement process according to the first embodiment. FIG. 3 is a schematic diagram illustrating coordinates of a forming roller in a workpiece diameter enlargement process according to the first embodiment. FIG. 6 is a cross-sectional view for explaining a workpiece flange cutting step according to the first embodiment. FIG. 6 is a cross-sectional view for explaining a workpiece joint forming step according to the first embodiment. FIG. 6 is an enlarged cross-sectional view for explaining a workpiece joint forming step according to the first embodiment. It is a figure which shows the relationship between the joint dimension of a workpiece | work by Embodiment 1, and a roller clearance gap dimension. 3 is a flowchart illustrating a workpiece joint forming process according to the first embodiment. It is a figure which shows the measurement principle of the joint height by the optical profile measuring device of Embodiment 1. FIG. It is a figure which shows the measurement of the joint height by the optical profile measuring device of Embodiment 1. FIG. It is a figure which shows the installation position of the optical profile measuring device of Embodiment 1. FIG. 5 is a plan view showing a spinning processing apparatus according to Embodiment 2. FIG. It is a top view which shows the state which mounted | wore the workpiece | work with the spinning processing apparatus of FIG. It is a figure which shows the structure of the in-body jig | tool and the holding jig of the spinning processing apparatus of FIG. FIG. 6 is an overall schematic diagram illustrating a workpiece forming process according to a second embodiment. FIG. 10 is a partial cross-sectional view showing a workpiece end cutting step according to a second embodiment. FIG. 10 is an enlarged cross-sectional view for explaining a workpiece joint forming step according to a second embodiment. It is a figure which shows the measurement of the joint width by the optical profile measuring device of Embodiment 2, and a joint height. 6 is a flowchart showing a workpiece joint forming process according to a second embodiment. FIG. 6 is a schematic diagram illustrating a roller interval measurement principle of a transmission laser sensor according to a third embodiment. 10 is a flowchart illustrating roller trajectory correction according to the third embodiment. FIG. 6 is a schematic diagram illustrating a roller interval measurement principle of a transmission laser sensor according to a third embodiment. 10 is a flowchart illustrating positioning of a jig and a roller according to a fourth embodiment. It is the schematic which shows welding of the mirror part and trunk | drum of a tank by Embodiment 5. FIG. FIG. 10 is a schematic diagram of a tank according to a fifth embodiment.

Embodiment 1 FIG.
1 is a plan view showing a spinning processing apparatus according to Embodiment 1 of the present invention, FIG. 2 is a plan view showing a state where a workpiece is mounted on the spinning processing apparatus of FIG. 1, and FIG. 3 is a roller of the spinning processing apparatus of FIG. It is a side view which shows a unit.

  As shown in FIGS. 1 to 3, the spinning processing apparatus 201 according to the first embodiment includes a motor 213, a rotation main shaft 202 that transmits the rotational force of the motor 213, a rotation main shaft 202, and a work 301 mounted thereon. An in-mirror jig 203 is provided. The workpiece 301 processed in the first embodiment is, for example, a mirror part of a water heater tank. The workpiece 301 is processed through the molding process shown in FIG. That is, for example, a stainless steel flat plate having a thickness of about 0.5 to 1.0 mm is prepared (FIG. 4A), and this flat plate is formed into a bowl shape by press forming such as deep drawing (FIG. 4B). ). The outermost diameter of the bowl shape is about φ200 mm to φ700 mm. These dimensions are determined by the design dimensions of the water heater tank. The saddle-shaped workpiece formed in FIG. 4 (b) undergoes the steps of diameter enlargement processing in FIG. 4 (c), flange cutting in FIG. 4 (d), and joint formation in FIG. 4 (e). The process of FIG.4 (c)-FIG.4 (e) is a process shape | molded by the spinning processing apparatus 201 of this Embodiment 1. FIG.

  In the spinning processing apparatus 201, the in-mirror jig 203 is shaped such that at least a part thereof is inscribed in the workpiece 301 to be processed. A core pushing jig 204 for pushing the outer surface side of the work 301 is disposed at a position facing the in-mirror jig 203, and the core pushing jig 204 is connected to the core pushing shaft 212. The core pushing shaft 212 can be rotated coaxially with the rotation main shaft 202 and can also be moved in the axial direction by a cylinder 207. The workpiece 301 to be machined is pushed into the in-mirror jig 203 by the core pushing jig 204, and after the machining of the workpiece 301 is completed, the core pushing jig 204 is retracted to be released.

  The “rotating mechanism for rotating the workpiece while the workpiece is mounted on the jig” in the claims refers to the motor 213, the rotation spindle 202, the in-mirror jig 203, the core pushing treatment in the first embodiment. The tool 204, the core pushing shaft 212, and the cylinder 207 are shown.

  The spinning processing apparatus 201 includes roller units 404a and 404b. The roller unit 404a includes a forming roller 205 that processes the workpiece 301 from the inner surface side of the workpiece 301 via the support arm 211a, and a cutting roller 401 that processes the workpiece 301 from the inner surface side of the workpiece 301 via the support arm 211a. It has. The cutting roller 401 and its support arm 211a are not shown in the plan views of FIGS. 1 and 2 because they are disposed below the forming roller 205 and the support arm 211a. The roller unit 404b includes a molding receiving roller 206 that comes into contact with the work 301 from the outer surface side of the work 301 through the support arm 211b, and a cutting receiving roller 402 that comes into contact with the work 301 from the outer surface side of the work 301 through the support arm 211b. I have. The cutting receiving roller 402 and its supporting arm 211b are not shown in the plan views of FIGS. 1 and 2 because they are disposed below the forming receiving roller 206 and its supporting arm 211b.

  FIG. 3 is a view of the roller unit 404a viewed from the side surface direction of the spinning processing apparatus. The forming roller 205 and the cutting roller 401 installed in two stages in the height direction (Z direction) of the roller unit 404a are moved up and down by the driving linear motor 403a. FIG. 3A shows a state where the forming roller 205 is positioned at the processing height. At this time, the work 301 is processed by the forming roller 205. FIG. 3B shows a state in which the cutting roller 401 is positioned at the processing height. At this time, the workpiece 301 is processed by the cutting roller 401. Reference numeral 501 denotes a base of the spinning processing apparatus 201.

  As shown in FIGS. 1 to 3, the roller unit 404a is moved in the horizontal direction (XY direction) on the base 501 of the spinning processing apparatus along the rail 209a by the drive servo motor 210a. Similarly, the roller unit 404b is moved in the horizontal direction (XY direction) on the base 501 of the spinning device along the rail 209b by the drive servo motor 210b.

  In the spinning processing apparatus 201 of FIGS. 1 to 3, the rotation main shaft 202 is configured to be parallel to the ground. However, the present invention is not limited to this, and the rotation main shaft 202 may be installed in the vertical direction with respect to the ground. Absent. 1 to 3, the forming roller 205 and the cutting roller 401 of the roller unit can be switched in the height direction (Z direction), but the arrangement of each roller is in this configuration. It is not limited. For example, as shown in FIG. 5, the forming roller 205 of the roller units 404 a and 404 b and the forming receiver are formed so that the rotation main shaft 202 of the spinning processing device 201 is set to the vertical direction and the workpiece 301 mounted in the vertical direction can be processed. A roller 206 may be disposed.

  1 and 2, the control unit 208 performs drive control of the entire spinning processing apparatus 201, and controls rotation of the motor 213, drive control of the cylinder 207, the molding roller 205, and the molding receiving roller 206. , Driving control of the cutting roller 401 and cutting receiving roller 402, driving control of the driving servo motor 210a of the roller unit 404a, and driving control of the driving servo motor 210b of the roller unit 404b. The optical profile measuring instrument 100 measures the joint shape of the workpiece 301 as described later, and the measurement result is input to the control unit 208.

Next, a workpiece forming process by the spinning processing apparatus according to the first embodiment will be described.
First, as shown in FIG. 2, the first step is to attach the workpiece 301 to the in-mirror jig 203 of the spinning processing apparatus 201 and press the workpiece 301 with a predetermined load by the core pushing jig 204. It is the process of fixing. This is to prevent the workpiece 301 from idling between the in-mirror jig 203 and the core pushing jig 204.

The second process is a process of expanding the diameter of the workpiece shown in FIG.
FIG. 6 is a cross-sectional view showing the vicinity of the workpiece for explaining the process of expanding the diameter of the workpiece. As shown in FIG. 6, while rotating a work 301 that is a mirror part of a water heater tank around the rotation main shaft 202 of the motor, the periphery of the opening of the work 301 is spread outward in the radial direction by using a forming roller 205. The plastic working is performed so that the diameter of the peripheral edge of the opening 301 is enlarged. This plastic working can improve the roundness of the periphery of the opening of the work 301 for the reason described below, and corrects the difference in diameter with the counterpart of the water heater tank, that is, the body of the water heater tank. can do.

FIG. 7 is a graph showing the relationship between the diameter ratio of the roundness of the workpiece and the diameter enlargement ratio (plastic working amount), and FIG. 8 is a diagram showing the work in the process from the diameter enlargement processing of the workpiece to after the joint formation. It is a figure for demonstrating the shape of a mirror part. 8A is the shape of the workpiece 301 after drawing, FIG. 8B is the shape of the workpiece 301 after diameter expansion processing, FIG. 8C is the shape of the workpiece 301 after cutting the drawing flange, FIG. 8D shows the shape of the work 301 after the joint is formed.
The diameter ratio of the roundness on the vertical axis in FIG. 7 indicates the ratio of the diameters of the maximum and minimum two concentric circles circumscribed and inscribed to the opening edge of the workpiece. The diameter expansion rate on the horizontal axis in FIG. 7 indicates the ratio between the diameter D0 of the workpiece opening edge after drawing and the diameter D1 of the workpiece opening edge after diameter expansion and joint molding, and {(D1-D0) / D0. } × 100 (%).
As shown in FIG. 7, a substantially linear relationship is established between the diameter ratio of the roundness of the opening edge of the workpiece and the diameter enlargement ratio (plastic working amount), and the roundness and hot water storage amount required in the assembly process are designed. The diameter expansion rate (plastic working amount) is determined in consideration of the diameter of the water heater tank required in step (1). If the diameter enlargement rate (plastic processing amount) is too small, machining unevenness occurs around the circumference of the workpiece 301. If the diameter enlargement rate (plastic processing amount) is too large, the opening edge of the work 301 is cut after the drawing flange is cut in the next process. For example, the diameter of the workpiece opening edge before and after the plastic working is 0.5 to 1.3 than the original diameter for the mirror part of the water heater tank of φ200 mm to φ700 mm. It is desirable to increase it by about%.

  Next, the diameter expansion range of the workpiece will be described. The range in which the diameter is enlarged, that is, the range in which the forming roller 205 pushes the inner periphery of the work (mirror part) 301 in the radial direction to perform plastic working is as shown in FIG. It is desirable that the range is from about 10 mm to the zenith side and from about 30 mm to the flange side in the zenith direction of the workpiece (mirror part) 301 from the aperture flange end. Particularly in the vicinity of the bending R (R) portion of the flange of the workpiece 301, the workpiece (mirror portion) 301 is subjected to large plastic deformation during drawing and is hardened, and the deformation resistance caused by the rolling direction of the workpiece material is different. Due to the influence of the directionality, when the diameter expansion range overlaps the bending R portion of the drawing flange, the diameter variation of the workpiece does not become uniform on the workpiece circumference.

Next, the trajectory control of the forming roller 205 in the workpiece diameter enlargement processing will be described with reference to FIG.
FIG. 9A is a schematic diagram showing a coordinate system of a workpiece (mirror part) and a forming roller. FIG. 9B is an enlarged cross-sectional view of the Q portion of FIG. 9A, showing the coordinate setting of the standard trajectory for the diameter expansion processing of the forming roller, and FIG. 9C is an enlarged cross-sectional view of the Q portion of FIG. It is a figure and shows the track and coordinate setting of the forming roller when the workpiece diameter is changed from the standard track.
In the process of expanding the diameter of the workpiece, the forming roller 205 operates along a trajectory as shown in FIGS. 9B and 9C and pushes the workpiece (mirror part) 301 outward in the radial direction. The diameter of the periphery of the opening of the work (mirror part) 301 is enlarged. The trajectory of the forming roller 205 is from the standby position of the forming roller 205 to the machining operation with the radial direction of the work (mirror part) 301 as the X-axis coordinate and the rotation axis direction of the work (mirror part) 301 as the Z-axis coordinate. The process and the process until it returns to the standby position after completion of machining are controlled by giving the coordinate points of multiple passing points, the movement speed between the coordinate points, and the rotation speed of the workpiece (mirror part) 301 between them. The forming roller 205 operates by linear interpolation along the passing point.
When the diameter enlargement ratio is changed, as shown in FIG. 9B, only the value of the X-axis coordinate of the machining trajectory is offset by a certain amount among the coordinate points.

The third step is a step of cutting the flange of the workpiece shown in FIG.
This step is a step of cutting a flange (referred to as a drawing flange) generated in the drawing step of the workpiece 301 at a predetermined position. The cutting position of the aperture flange is determined by the design value of the depth of the workpiece (mirror part) 301 and the height of the joint to be formed in the fourth step, but after the joint formation in the fourth step, in the second step It is desirable that the processed diameter expansion range remains about 10 mm.
As shown in FIG. 10, in the cutting process of the drawing flange, the cutting receiving roller 402 is disposed at a predetermined position on the outer peripheral surface of the work 301 and the cutting roller is rotated while the work 301 is rotated by the rotation main shaft 202 of the motor. This is performed by moving 401 along a predetermined path outward in the radial direction from the inner peripheral surface of the work 301. At this time, the workpiece 301 is sandwiched between the cutting receiving roller 402 and the cutting roller 401, and the workpiece 301 is sheared. The workpiece 301 after the drawing flange is cut may have an inner recess or a trumpet shape due to the release of residual stress during drawing. If the opening edge of the workpiece has an inner dent or trumpet shape, there is a problem that the joint shape cannot be formed into a predetermined shape in the joint forming in the fourth step, or the butt is poor during circumferential welding of the joint, resulting in poor welding. It was. However, as described above, an appropriate amount of plastic working (diameter enlargement processing) is applied to the peripheral edge of the workpiece opening in the second step, and the throttle flange is separated at an appropriate position in the third step. Even after cutting, the workpiece opening can be shaped so as to be substantially parallel to the rotation axis, and the molding failure and welding failure of the workpiece can be reduced.

The fourth step is a step of joint forming of the workpiece shown in FIG.
In the workpiece joint forming step, as shown in FIG. 11, the forming receiving roller 206 is disposed so as to be in contact with the outer peripheral surface on the workpiece top portion side by a distance A from the opening side end portion of the workpiece (mirror portion) 301. The molding roller 205 is moved radially outward from the inner surface of the workpiece 301 at a position where the gap S between the molding roller 205 and the molding receiving roller 206 is a predetermined distance while the workpiece 301 is rotated by the rotation main shaft 202 of the motor. Move to. As a result, an L-shaped joint 301 </ b> A can be formed at the opening edge of the work 301 as shown in the enlarged view of the work joint forming in FIG. 12. The gap S is, for example, about 30 to 50% of the workpiece plate thickness. At this time, as will be described later, the joint height of the workpiece 301 is measured by the optical profile measuring instrument 100. Then, by correcting the trajectory of the forming roller 205 based on this measurement result, it is possible to form a joint with small dimensional variation. In the butt welding structure of a joint for a water heater tank, if a displacement in the plate thickness direction occurs between the butt plates, the molten pool melts during welding and welding cannot be performed, or steps are created after welding, resulting in stress concentration. There was a problem that the fatigue strength was lowered. However, according to the roller molding correction method for joint forming according to the present embodiment described below, there is a remarkable effect that variation in joint dimensions can be suppressed and welding defects can be reduced.

  Here, a roller trajectory correction method for workpiece joint forming according to the first embodiment will be described. As described above, the molding receiving roller 206 is positioned on the top side by the distance A from the opening side end of the workpiece (mirror part) 301 as shown in FIG. On the other hand, the molding roller 205 moves outward in the radial direction while keeping the gap S with respect to the molding receiving roller 206 constant. Therefore, at first, the workpiece opening end projecting a predetermined length in the rotation axis direction from the molding receiving roller 206 is molded by the molding roller 205 so as to be bent outward in the radial direction. At this time, if the gap S between the forming roller 205 and the forming receiving roller 206 is set to be smaller than the plate thickness of the workpiece, the plate thickness of the workpiece is compressed by adding ironing, and the L-shaped joint 301A after molding is compressed. Height increases. Further, when the number of processing is very large due to continuous processing, the forming roller 205, the forming receiving roller 206, and the support arms 211a and 211b that support the rollers are thermally expanded due to the accumulation of processing heat. The gap S between the roller 205 and the molding receiving roller 206 is narrowed, and the height of the L-shaped joint 301A is increased.

Here, FIG. 13 is a diagram showing the relationship between the joint dimension and the roller gap dimension. In FIG. 13, when the joint reference height (arbitrarily set value) is H0 and the joint height measured by the optical profile measuring instrument is H, the rate of increase / decrease from the joint reference height is {( H−H0) / H0} × 100 (%), which is the vertical axis of FIG. On the other hand, when the set value of the gap between the rollers is S and the plate thickness of the workpiece material is T, the gap size / plate thickness is S / T × 100 (%), which is the horizontal axis in FIG. Then, assuming that the vertical axis in FIG. 13 is the Y axis and the horizontal axis is the X axis, the approximate expression Y = AX + B: (A <0, B> 0) holds for each workpiece material. That is, a linear relationship is established between the L-shaped joint dimension and the roller gap dimension for each workpiece material.
Then, the relationship between the L-shaped joint dimension and the roller gap dimension for each workpiece material (approximate expression in FIG. 13: Y = AX + B) is input in advance to the control unit 208 of the spinning processing apparatus. Then, the joint height H measured by the optical profile measuring instrument 100 is input to the control unit 208 of the spinning processing apparatus. When the measured height H of the joint is input, the control unit 208 of the spinning apparatus determines a rate of increase / decrease from the reference height of the joint on the vertical axis (Y axis) in FIG. S / T (gap size / plate thickness) of the approximate expression is determined, and the gap S between the rollers corresponding to the measured joint height H is obtained. Then, the control unit 208 of the spinning processing apparatus positions the molding roller 205 and the molding receiving roller 206 so that the obtained gap S between the rollers corresponds to the gap between the rollers corresponding to the target joint height. to correct.

FIG. 14 is a flowchart showing a joint forming process for a workpiece according to the first embodiment. The flowchart of FIG. 14 includes a two-stage molding process, that is, preforming and finish molding.
In FIG. 14, first, preforming of joint forming of a workpiece is performed (step S01). In the pre-forming, the forming roller 205 and the forming receiving roller 206 of the spinning processing apparatus 201 are driven in a preset path to form the L-shaped joint 301A of the work 301. This pre-forming step is a preliminary step for confirming the processing state of the L-shaped joint 301A of the workpiece 301 by the spinning processing device in advance before the main forming step.
Next, in step S02, the optical profile measuring instrument 100 measures the joint height H of the L-shaped joint 301A formed in the preforming process.
Next, in step S03, in the control unit 208 of the spinning processing apparatus, the gap between the forming roller 205 and the forming receiving roller 206 corresponding to the joint height H measured by the optical profile measuring instrument 100 as described above. S is obtained.
Next, in step S04, the control unit 208 of the spinning processing apparatus and the forming roller 205 and the molding so that the gap S between the rollers obtained in step S03 becomes the gap between the rollers corresponding to the target joint height. The machining trajectory of the receiving roller 206 is corrected.
Then, in step S05, finish forming of the joint forming of the workpiece is performed. In the finish forming, the forming roller 205 and the forming receiving roller 206 of the spinning processing apparatus 201 are driven on the track corrected in step S04, and the L-shaped joint 301A of the workpiece 301 is finally formed.
In step S06, the number of finishing moldings in step S05 is counted, and when the molding number N reaches a predetermined number Nk, the process returns to step S02 to measure the joint height, calculate the clearance S (step S03), Determination (step S04) and finish molding (step S05) are performed. When the number N of finish forming reaches the predetermined number Nz in step S06, the joint forming of the workpiece is finished.

Next, a method for measuring the joint height using the optical profile measuring instrument 100 according to the first embodiment will be described. FIG. 15 is a diagram illustrating the principle of measuring the joint height by the optical profile measuring instrument 100. As shown in FIG. 15, the optical profile measuring instrument 100 includes a light source 101, a light receiving unit 104 including a lens 102 and a light receiving element 103. The measurement target object reflects light from the light source 101 as scattered light, the reflected light is imaged on the light receiving element 103 through the lens 102 of the light receiving unit 104, and the distance L from the target object is detected by detecting the imaging position. Measure.
As shown in FIG. 16A, the light source 101 and the light receiving unit 104 of the optical profile measuring instrument 100 are installed in the rising direction of the L-shaped joint 301 </ b> A of the work 301. Then, for example, when the laser light emitted from the light source 101 in a band shape passes through the L-shaped joint 301A of the workpiece 301, the rising height h of the L-shaped joint 301A can be measured from the measurement result of FIG. .
FIG. 17 shows the installation position of the optical profile measuring instrument 100, and it is desirable to install the optical profile measuring instrument 100 after passing the forming roller 205 in the rotation direction of the work 301, but the position is not necessarily limited to this position. Since the height dimension of the L-shaped joint 301A varies depending on the circumference of the workpiece, the optical profile measuring instrument 100 measures the circumference by measuring the joint height at an appropriate time interval according to the rotation speed of the workpiece 301. Measure and average at multiple locations.

  When a dielectric displacement sensor or the like is used to measure the joint height, it is difficult to accurately measure the joint height if the joint molding position is shifted, but the optical profile measuring instrument 100 has a certain irradiation range. Therefore, within the irradiation range, there is an effect that the joint dimensions can be accurately measured even if the joint molding position is shifted.

  As described above, according to the first embodiment of the present invention, the trajectory of both rollers is corrected based on the result of optically directly measuring the shape of the workpiece, so that the product dimensions of the workpiece can be made highly accurate. It can be corrected. Further, if only the change rate of the dimension of the workpiece to the displacement of the roller trajectory is known in advance, the correction trajectory of the roller can be obtained, and there is an effect that the preliminary experiment for grasping the correction amount can be simplified.

  Further, there is an effect that the correction accuracy is higher than that of estimating the amount of change in the workpiece shape from the conventionally proposed roller temperature, roller displacement or load load, and estimating the forming correction amount.

Embodiment 2. FIG.
18 is a plan view showing a spinning processing apparatus according to Embodiment 2 of the present invention, FIG. 19 is a plan view showing a state in which a workpiece is mounted on the spinning processing apparatus of FIG. 18, and FIG. 20 is a grip of the spinning processing apparatus of FIG. It is the schematic which shows the structure of a part.

  As shown in FIGS. 18 to 19, the spinning processing apparatus 201 according to the first embodiment includes a motor 213, a rotating main shaft 202 that transmits the rotational force of the motor 213, and an in-body jig 703 connected to the rotating main shaft 202. And a gripping jig 704. The workpiece 601 to be processed in the second embodiment is, for example, a body portion of a water heater tank. The workpiece 601 (the body of the water heater tank) is processed through the molding process shown in FIG. That is, for example, a stainless steel flat plate having a thickness of about 0.5 to 1.0 mm is prepared (FIG. 21A), and this flat plate is roll-bent formed (FIG. 21B). Then, a cylindrical shape is formed by welding two opposite sides after roll bending (FIG. 21 (c)). The outermost diameter of the cylindrical shape is about φ200 to φ700 mm. These dimensions are determined by the design dimensions of the water heater tank. Thereafter, the cylindrical workpiece formed in FIG. 21B is subjected to a workpiece end cutting step in FIG. 21D and a workpiece joint forming step in FIG. In addition, FIG.21 (f) is an enlarged view of the joint cross section of a workpiece | work. The steps of FIG. 21D to FIG. 4E are steps for forming by the spinning processing apparatus 201 of the first embodiment.

  FIG. 20 is a schematic diagram illustrating the configuration of the in-body jig and the holding jig of the workpiece. The in-body jig 703 is connected to the rotation main shaft 202a, and the outer periphery thereof is substantially inscribed in the inner periphery of the work 601 (the body of the water heater tank). The gripping jig 704 includes a fan-shaped gripping block 901 that contacts the inner peripheral surface of the workpiece 601, a support portion 902 that supports the gripping block 901, and a wedge-shaped driven portion 903 that is installed at the end of the support portion 902. doing. The support portion 902 of the gripping jig 704 is movable in the workpiece radial direction along the rail 703a of the in-body jig 703. A conical drive portion 904 is connected to the rotation main shaft 202b. When the drive portion 904 is moved in the direction of arrow R1 in FIG. 20A by the rotation main shaft 202b, the driven portion 903 of the gripping jig 704 is changed to FIG. b) moves in the direction of arrow R2, and as a result, the gripping block 901 pushes and grips the inner peripheral surface of the workpiece 601. In FIG. 20, an example of four gripping blocks 901 is depicted, but the number is not limited to four. The gripping jig 704 has a function of transmitting a rotational force from the rotary spindle 202b to the work 601 and restraining a displacement in the axial direction of the work 601 that occurs during molding.

  Referring back to FIGS. 18 and 19, reference numeral 705 denotes a trunk core pressing jig in contact with the other end of the work 601, which can be rotated coaxially with the rotary main shaft 202 and is also movable in the axial direction by the cylinder 207 and the core pressing shaft 212. It has become. When inserting the workpiece 601 into the in-cylinder jig 703, the trunk core pressing jig 705 presses the workpiece 601 against the end surface stopper 706 to perform axial positioning, and rotates together with the workpiece 601 during the forming process. It has a function of suppressing the end of the side not processed from shaking. Note that the end surface stopper 706 moves backward to a position that does not hinder the forming process after the position of the workpiece 601 is restrained by the gripping jig 704.

  In the second embodiment, the “rotating mechanism for rotating the workpiece while the workpiece is mounted on the jig” in the claims is the motor 213, the rotation main shaft 202, the in-body jig 703, and the gripping jig. 704, a trunk core pressing jig 705, a core pressing shaft 212, and a cylinder 207 are shown.

  As shown in FIGS. 18 and 19, the spinning processing apparatus 201 includes roller units 404a and 404b, and the roller units 404a and 404b have the same configuration as that of the first embodiment. However, the difference from the first embodiment is that the roller unit 404a has a body forming roller 801 that processes the work 601 from the inner surface side of the work 601 instead of the forming roller 205, and the roller unit 404b has a forming receiving roller. Instead of 206, a cylinder forming receiving roller 802 that is in contact with the work 601 from the outer surface side of the work 601 is mounted.

  It should be noted that the “forming roller and forming receiving roller for forming the processed portion by sandwiching the processed portion of the workpiece from the inner surface and the outer surface” in the claims are the cylinder forming roller 801 and the forming roller 801 in Embodiment 2. A barrel forming receiving roller 802 is shown.

Next, a workpiece forming process by the spinning processing apparatus according to the second embodiment will be described.
First, as shown in FIG. 18 and FIG. 19, the first step is to insert the workpiece 601 into the in-body jig 703 and the gripping jig 704, and axial positioning by the end face stopper 706 and the trunk core pushing jig 705. In addition, the workpiece 601 is gripped by the gripping jig 704.

  The second step is an end cutting step in which a predetermined length is cut from the end surface of the workpiece shown in FIG. As shown in FIG. 22, the end of the workpiece 601 is cut by placing the cutting receiving roller 402 at a predetermined position on the outer surface of the workpiece 601 and rotating the cutting roller 401 from the inner surface of the workpiece 601 while rotating the workpiece 601. The workpiece 601 is sandwiched between the cutting receiving roller 402 and the cutting roller 401 by being moved radially outward along a predetermined trajectory, and sheared at a predetermined position.

  The third step is a Z-shaped joint forming step for the workpiece shown in FIGS. As shown in FIG. 23, the barrel forming receiving roller 802 is disposed so as to be in contact with the outer surface on the other end side by a predetermined length from the opening end portion of the work 601. Then, while rotating the workpiece 601, the drum forming roller 801 is moved from the inner surface side of the workpiece 601 toward the drum forming receiving roller 802 along a predetermined path, and the end of the workpiece 601 is moved to the drum forming receiving roller 802. By pressing, a Z-shaped joint is formed at the open end of the work 601. The body forming receiving roller 802 has a stepped portion 802a having a predetermined shape, and the workpiece 601 is formed in a Z shape along the stepped portion 802a.

  At this time, the optical profile measuring instrument 100 measures the dimension of the Z-shaped joint of the workpiece 601. And based on this measurement result, as will be described later, by correcting the trajectory of the cylinder forming roller 801, it is possible to form a joint with small dimensional variation. When a plurality of workpieces 601 are continuously processed by a spinning processing apparatus, if the number of processing increases or the processing time increases, the rollers and arms that support the rollers are thermally expanded due to the accumulation of processing heat, so There is a problem that the gap between the roller 801 and the cylinder forming receiving roller 802 is narrowed, and as a result, the dimensions of the joint are changed. If the joint dimensions of the workpiece change, when the workpiece is circumferentially welded in the subsequent process, the material melted by welding will increase or decrease, and the target position of the welding torch will change, so the molten pool will melt away There was a problem that welding could not be performed or a step was formed after welding, resulting in a stress-concentrated portion and a decrease in fatigue strength. However, according to the roller molding correction method for joint forming according to the present embodiment described below, the joint dimension variation can be suppressed to a small value, so that there is a remarkable effect that welding defects can be reduced.

  Here, a roller trajectory correction method for workpiece joint forming according to the second embodiment will be described. As described above, the barrel forming receiving roller 802 is positioned on the other end side by a predetermined length from the opening end portion of the work 601 (the barrel portion of the water heater tank) as shown in FIG. On the other hand, the cylinder forming roller 801 operates from a predetermined position on the inner peripheral side of the work 601 in a predetermined path toward the cylinder forming receiving roller 802. Accordingly, the work 601 that protrudes a predetermined length from the cylinder forming receiving roller 802 is initially pressed against the step 802a of the cylinder forming receiving roller 802 while being bent radially outward by the cylinder forming roller 801. Molded into a Z shape.

  At this time, if the gap between the cylinder forming roller 801 and the cylinder forming receiving roller 802 is set to be narrower than the plate thickness of the work 601, the plate thickness of the work 601 is compressed by the ironing process, and the joint dimensions after forming change. To do. In addition, when there are a large number of workpieces in continuous machining of multiple workpieces, the rollers and arms supporting the rollers thermally expand due to the accumulation of machining heat, resulting in a narrow gap between the molding roller and the molding receiving roller. Will change.

Therefore, as shown in FIG. 24, the optical profile measuring instrument 100 measures the shape of the Z-shaped joint 601 </ b> A of the workpiece 601. Here, it has been found that the dimension of the Z-shaped joint 601A and the dimension between the roller gaps have a linear relationship as in the first embodiment. That is, the joint width (length in the workpiece axis direction) and the joint height (height in the workpiece radial direction) of the Z-shaped joint 601A of the workpiece 601 and the gap between the cylinder forming roller 801 and the cylinder forming receiving roller 802 There is a linear relationship between the dimensions.
Then, the relationship between the Z-shaped joint dimension and the roller gap dimension for each workpiece material is input in advance to the control unit 208 of the spinning processing apparatus. Then, the joint width and joint height of the Z-shaped joint 601A measured by the optical profile measuring instrument 100 are input to the control unit 208 of the spinning processing apparatus. When the measured joint width and joint height are input, the control unit 208 of the spinning processing apparatus obtains a clearance S between the rollers corresponding to the measured joint width and joint height. Then, the control unit 208 of the spinning device controls the body forming roller 801 and the body forming receiving roller 802 so that the obtained gap S becomes a space between the rollers corresponding to the target joint width and joint height. Correct the trajectory.

FIG. 25 is a flowchart showing a Z-shaped joint forming process of a workpiece by the spinning device of the second embodiment. The flowchart of FIG. 25 includes a two-stage molding process, that is, preforming and finish molding.
In FIG. 25, first, pre-forming of workpiece joint forming is performed (step S11). In the pre-forming, the cylinder forming roller 801 and the cylinder forming receiving roller 802 of the spinning processing apparatus 201 are driven in a preset path to form the Z-shaped joint 601A of the workpiece 601. This pre-forming is a preliminary process for confirming the processing condition of the Z-shaped joint 601A of the workpiece 601 by a spinning processing device in advance before the main forming.
Next, in step S12, the optical profile measuring instrument 100 measures the joint width and joint height of the Z-shaped joint 601A formed in the preforming process.
Next, in step S13, the control unit 208 of the spinning processing apparatus obtains a gap S between the cylinder forming roller 801 and the cylinder forming receiving roller 802.
Next, in step S14, the control unit 208 of the spinning processing apparatus causes the cylinder forming roller 801 and the cylinder to form the gap S between the rollers corresponding to the target joint width and joint height. The machining trajectory of the molding receiving roller 802 is corrected.
Then, in step S15, finish forming of the joint forming of the workpiece is performed. In the finish forming, the drum forming roller 801 and the drum forming receiving roller 802 of the spinning processing apparatus 201 are driven on the track corrected in step S14, and the Z-shaped joint 601A of the workpiece 601 is finally formed.
In step S16, the number of finish moldings in step S15 is counted, and when the molding number N reaches a predetermined number Nk, the process returns to step S12, the joint width and joint height are measured, and the clearance S is calculated (step S13). Roller track determination (step S14) and finish molding (step S15) are performed. When the number N of finish forming reaches the predetermined number Nz in step S16, the joint forming of the workpiece is finished.

  Conventionally, the correction method according to the second embodiment calculates the correction value directly from the dimensions of the workpiece, compared with the case where the roller thermal expansion amount is predicted from the roller temperature and the processing load, and the correction amount is further calculated therefrom. There is a remarkable effect that the correction accuracy is high and the dimensional variation of the molded product can be suppressed.

  Next, a method for measuring joint dimensions by the optical profile measuring instrument 100 according to the second embodiment will be described. Since the configuration of the optical profile measuring instrument 100 is the same as that of the first embodiment, the description thereof is omitted. As shown in FIG. 24, in the optical profile measuring instrument 100, for example, when a light source that irradiates a laser beam as a light source is used, the distance to the object in the irradiation range can be measured. It is possible to measure the joint shape having dimensions in the axial direction and the radial direction of the workpiece such as 601A, that is, the joint width and joint height of the Z-shaped joint 601A, and the dimensions in the joint width direction and the joint height direction. There is an effect that variations can be detected simultaneously. Further, there is an effect that the joint dimensions can be accurately measured even if the molding position is shifted.

  As in the case of the first embodiment, the optical profile measuring instrument 100 is desirably installed after passing the roller in the rotation direction of the workpiece 601, but is not necessarily limited thereto. Since the joint dimensions vary depending on the workpiece circumference, the optical profile measuring instrument 100 measures and averages a plurality of locations in the circumference by measuring joint dimensions at appropriate time intervals according to the number of rotations of the workpiece, and corrects them. Calculate the amount.

  As described above, according to the second embodiment of the present invention, the trajectory of both rollers is corrected from the result of optically directly measuring the shape of the workpiece, so that the product dimensions of the workpiece can be made highly accurate. It can be corrected. Further, if only the change rate of the dimension of the workpiece to the displacement of the roller trajectory is known in advance, the correction trajectory of the roller can be obtained, and there is an effect that the preliminary experiment for grasping the correction amount can be simplified.

  Further, in the first embodiment, an example in which an L-shaped joint is formed on the mirror part of the tank and a Z-shaped joint is formed on the body part of the tank in the second embodiment has been described. The present invention can be similarly applied to the case of forming a shaped joint or the case of forming an L-shaped joint on the body of the tank.

Embodiment 3 FIG.
In the third embodiment of the present invention, the gap between the molding roller and the molding receiving roller is measured by a transmission laser sensor, and the measured value of the gap between both rollers measured by the transmission laser sensor is set in advance. The processing trajectories of both rollers are corrected based on the difference between the gaps of the two rollers, and both rollers are driven by the corrected processing trajectory.

  The third embodiment can be applied to both the joint molding of the workpiece of the first embodiment and the joint molding of the workpiece of the second embodiment. The molding roller and the molding receiving roller described here correspond to the molding roller 205 and the molding receiving roller 206 in the first embodiment, and the cylinder molding roller 801 and the cylinder molding receiving roller in the second embodiment. Corresponds to 802. In the following description, the case where the molding roller 205 and the molding receiving roller 206 of the first embodiment are used will be described. However, the cylinder molding roller 801 and the cylinder molding receiving roller 802 of the second embodiment are used. The same applies to the case.

  As shown in FIG. 26, the transmissive laser sensor 1000 includes a light emitting unit 1001 and a light receiving unit 1002, and laser light is irradiated in a band shape from the light emitting unit 1001 toward the light receiving unit 1002. The light emitting unit 1001 and the light receiving unit 1002 of the transmissive laser sensor 1000 are installed so that the laser beam irradiated in a band shape passes near the position where the distance between the molding roller 205 and the molding receiving roller 206 is the narrowest. . When the molding roller 205 and the molding receiving roller 206 block a part of the laser beam, the light receiving range and light quantity of the light receiving unit 1002 change, and the distance between both rollers can be detected.

FIG. 27 is a flowchart showing the correction of the roller trajectory according to the third embodiment.
In FIG. 27, first, in step S21, with the workpiece removed, the forming roller 205 and the forming receiving roller 206 are driven on a preset processing path.
In step S22, the transmission laser sensor 1000 measures the gap S between the forming roller 205 and the forming receiving roller 206.
Next, in step S23, the control unit 208 of the spinning processing apparatus according to the difference between the gap S between the rollers 205 and 206 measured in step S22 and the preset gap between the rollers. The machining trajectory of the rollers 205 and 206 is corrected.
Then, in step S24, joint forming of the workpiece is performed. In this forming, the forming roller 205 and the forming receiving roller 206 are driven on the processing trajectory corrected in step S23 to form a workpiece joint.
In step S25, the number of times the workpiece is formed in step S24 is counted, and when the number N of forming reaches the predetermined number Nk, the process returns to step S22 to measure the gap S between both rollers, and the roller track is corrected (step S23). Molding (step S24) is performed. If the number N of finish forming reaches the predetermined number Nz in step S25, the joint forming of the workpiece is finished.

  FIG. 26 shows the case where the gap between the molding roller 205 and the molding receiving roller 206 is measured at once by the transmission laser sensor 1000. However, as shown in FIG. The roller 206 may be individually measured to determine the gap between the two rollers. That is, the reference positions of the light emitting unit 1001 and the light receiving unit 1002 are set, and only the forming roller 205 is driven on a preset processing path as shown in FIG. As shown in FIG. 28 (b), only the molding receiving roller 206 is driven by a preset working path to measure the detection position of the molding receiving roller 206, and the gap between the two rollers is obtained from the measured values of both. .

  In the case of directly measuring the joint shape of the workpiece as in the first embodiment and the second embodiment, there is a restriction that the optical profile measuring device must be installed in the vicinity of the workpiece. For example, the measurement can be performed by moving the molding roller and the molding receiving roller to a predetermined measurement position, so that the transmission type laser sensor can be installed at an appropriate position regardless of the shape of the workpiece.

  Further, compared to the case where the thermal expansion amount of the roller is predicted from the roller temperature and the processing load as in the prior art, and the correction amount is further obtained therefrom, according to the present embodiment, the gap between both the rollers is transmitted through the transmission type laser sensor. Since the correction value is obtained by direct measurement in step 1, there is a remarkable effect that the correction accuracy is high and the dimensional variation of the molded product can be suppressed. In addition, since it is not necessary to form a joint by pre-molding, it can be corrected from the first workpiece.

  As described above, according to the third embodiment of the present invention, the trajectory of both rollers is corrected based on the direct measurement result of the gap between both rollers sandwiching the workpiece. It can be corrected.

Embodiment 4 FIG.
In the fourth embodiment of the present invention, the position of a jig on which a workpiece is mounted is measured by an optical profile measuring device, the positions of a molding roller and a molding receiving roller are measured by a transmission laser sensor, and an optical profile is measured. The jig and both rollers are positioned based on the position of the jig measured by the instrument and the positions of both rollers measured by the transmission laser sensor.

  The fourth embodiment can be applied to the spinning processing apparatuses of the first and second embodiments. Here, the same optical profile measuring instrument as the optical profile measuring instrument 100 used in the first and second embodiments is used. The transmission laser sensor is the same as the transmission laser sensor 1000 used in the third embodiment. The jig corresponds to the in-mirror jig 203 and the core pushing jig 204 in the first embodiment, and corresponds to the in-body jig 703, the gripping jig 704, and the trunk pushing jig 705 in the second embodiment. To do. Further, the molding roller and the molding receiving roller correspond to the molding roller 205 and the molding receiving roller 206 in the first embodiment, and correspond to the cylinder molding roller 801 and the cylinder molding receiving roller 802 in the second embodiment. To do.

FIG. 29 is a flowchart showing the positioning of the jig and both rollers according to the fourth embodiment.
In FIG. 29, in step S31, the position of the jig on which the workpiece is mounted is measured by the optical profile measuring instrument.
On the other hand, in step S32, the positions of the molding roller and the molding receiving roller are measured by the transmission type laser sensor.
In step S33, the jig and both rollers are positioned based on the position of the jig measured in step S31 and the positions of the molding roller and the molding receiving roller measured in step S32.

  As described above, according to the present embodiment, the position of the jig is detected by the optical profile measuring instrument, and the positions of both the rollers are detected by the transmission laser sensor. Can be found in contact and instantaneously. Conventionally, when inspecting the positional relationship between a jig and both rollers by changing or replacing, there has been a method of positioning by bringing them into contact with each other or pressing them against the positioning jig, but the contact force increases. There was a problem that excessive indentation was generated or the accuracy was different depending on the operator. In addition, there was a method to make contact determination based on the load current of the servo that drives both rollers. There was a problem that it could not be judged.

  On the other hand, according to the position detection method of both the rollers and the jig according to the fourth embodiment, since the rollers are not brought into contact with each other, there is an effect that the positioning can be performed without causing variation and indentation by the operator. In addition, since the measurement result can be visualized two-dimensionally, more accurate positioning is possible.

Embodiment 5 FIG.
In the fifth embodiment, a tank is manufactured by joining a mirror part and a body part of the tank manufactured in the above embodiment.
30 shows the L-shaped joint 301A of the mirror part 301 of the tank manufactured according to the first or third embodiment and the Z of the trunk part 601 of the tank manufactured according to the second or third embodiment. It is the schematic which shows the place where the character-shaped joint 601A is faced | matched and circumference welding is carried out with the welding machine 1100 over the perimeter of a tank. FIG. 31 is a schematic view showing a tank produced by circumferential welding of the mirror part 301 and the body part 601 of the tank. As described above, a Z-shaped joint is formed on the mirror part 301 of the tank, and an L-shaped joint is formed on the body part 601 of the tank, so that the Z-shaped joint and the L-shaped joint are abutted. Thus, the tank may be manufactured by circumferential welding over the entire circumference.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

100 optical profile measuring device, 101 light source, 102 lens,
DESCRIPTION OF SYMBOLS 103 Light receiving element, 104 Light receiving part, 201 Spinning processing apparatus, 202 Rotating spindle, 203 In-mirror jig, 204 Core pushing jig, 205 Molding roller,
206 molding receiving roller, 207 cylinder, 208 control unit,
209 Drive rail, 210 Drive servo motor, 211 Support arm,
212 core pushing shaft, 213 motor, 301 workpiece, 401 cutting roller,
402 cutting receiving roller, 404 roller unit,
501 Foundation of spinning processing device, 601 work, 703 in-body jig,
704 gripping jig, 705 trunk core pressing jig, 706 end face stopper,
801 Roller for forming a cylinder, 802 Roller for receiving a cylinder, 1901 Grasping block,
902 support unit, 903 driven unit, 1000 transmission type laser sensor,
1001 Light emitting part, 1002 Light receiving part.

Claims (11)

A rotating mechanism for rotating the workpiece in a state where the workpiece is mounted on a jig, a molding roller and a molding receiving roller for sandwiching a workpiece portion of the workpiece from an inner surface and an outer surface, and molding the workpiece portion; An optical profile measuring instrument for measuring the shape of the processed part, and a measurement value of the optical profile measuring instrument are inputted, and the relationship between the dimension of the processed part inputted in advance and the dimension of the gap between the two rollers is And a controller that corrects the trajectories of the rollers so that a gap between the rollers corresponds to a target shape of the workpiece, and drives the rollers with the corrected trajectory. Spinning processing equipment provided. Molding of the workpiece is L-shaped joint molding, the optical profile measuring instrument measures the height of the L-shaped joint, and the control unit measures the measured value of the optical profile measuring instrument. Based on the relationship between the input height dimension of the L-shaped joint and the dimension of the gap between the rollers, the value corresponding to the target L-shaped joint. The spinning processing apparatus according to claim 1, wherein the trajectories of the two rollers are corrected so that the two rollers are driven along the corrected trajectories. The forming of the workpiece is a Z-shaped joint, the optical profile measuring instrument measures the width and height of the Z-shaped joint, and the control unit measures the optical profile measuring instrument. A Z-shaped joint in which the gap between the two rollers is a target based on the relationship between the width and height of the Z-shaped joint that has been input in advance and the dimension of the gap between the two rollers. The spinning processing apparatus according to claim 1, wherein the trajectories of the two rollers are corrected so as to have a value corresponding to, and the rollers are driven on the corrected trajectory. A rotating mechanism that rotates the workpiece while the workpiece is mounted on a jig, a molding roller and a molding receiving roller that sandwich the workpiece portion of the workpiece from an inner surface and an outer surface, and mold the workpiece portion; A transmission type laser sensor for measuring a gap between the rollers, and a measurement value of the gap between the two rollers measured by the transmission type laser sensor and a difference between the preset gap between the two rollers. A spinning processing apparatus comprising a control unit that corrects the machining trajectory of the motor and drives the rollers with the corrected machining trajectory. A rotating mechanism for rotating the workpiece in a state where the workpiece is mounted on a jig, a molding roller and a molding receiving roller for sandwiching a workpiece portion of the workpiece from an inner surface and an outer surface, and molding the workpiece portion; An optical profile measuring instrument for measuring the position of the tool and a transmission type laser sensor for measuring the positions of the two rollers, and the jig based on the measured position of the jig and the measured positions of the two rollers. And a spinning device for positioning the rollers. A method of manufacturing a mirror part of a tank,
Expanding the diameter of the periphery of the opening of the work by pressing a forming roller from the inner surface of the work while rotating the work formed into a bowl shape;
While rotating the work, the opening edge of the work is sandwiched and formed from the inner surface and the outer surface by a forming roller and a forming receiving roller, and the shape of the work portion of the work is measured with an optical profile measuring instrument, Based on the relationship between the dimension of the workpiece and the dimension of the gap between the rollers, the trajectory of the rollers is adjusted so that the gap between the rollers has a value corresponding to the target shape of the workpiece. And a step of forming an L-shaped joint or a Z-shaped joint at the opening edge of the workpiece by correcting and driving the both rollers along the corrected trajectory. A method of manufacturing a tank body,
While rotating the workpiece formed into a cylindrical shape, the opening edge of the workpiece is formed by sandwiching the opening edge of the workpiece from the inner surface and the outer surface with a molding roller and a molding receiving roller, and the shape of the workpiece part of the workpiece is an optical profile measuring instrument. Based on the relationship between the dimension of the workpiece and the dimension of the gap between the rollers, the gap between the rollers is set to a value corresponding to the target shape of the workpiece. A step of forming a Z-shaped joint or an L-shaped joint at the opening edge of the workpiece by correcting the paths of both rollers and driving the both rollers along the corrected path; Production method. A method of manufacturing a mirror part of a tank,
Expanding the diameter of the periphery of the opening of the work by pressing a forming roller from the inner surface of the work while rotating the work formed into a bowl shape;
While rotating the workpiece, the opening edge of the workpiece is formed by being sandwiched between an inner surface and an outer surface by a molding roller and a molding receiving roller, and a gap between the two rollers is measured by a transmission laser sensor, and the transmission laser sensor The processing trajectory of both rollers is corrected according to the difference between the measured value of the clearance between the rollers measured by the above and the clearance between the rollers set in advance, and the rollers are moved in the corrected processing trajectory. And a step of forming an L-shaped joint or a Z-shaped joint at the opening edge of the workpiece by driving. A method of manufacturing a tank body,
While rotating the workpiece formed in a cylindrical shape, the opening edge of the workpiece is formed by sandwiching it between the inner surface and the outer surface with a molding roller and a molding receiving roller, and the gap between the two rollers is measured with a transmission laser sensor, According to the difference between the measured value of the gap between the two rollers measured by the transmissive laser sensor and the gap between the two rollers set in advance, the machining trajectories of the two rollers are corrected, and the corrected machining trajectory is corrected. And a step of forming a Z-shaped joint or an L-shaped joint at the opening edge of the workpiece by driving both rollers. The opening part of the tank mirror part manufactured by the manufacturing method according to claim 6 or claim 8 and the opening part of the tank body part manufactured by the manufacturing method according to claim 7 or claim 9, A tank manufacturing method in which an L-shaped joint formed on one opening edge and a Z-shaped joint formed on the other opening edge are connected by circumferential welding. A tank in which the opening of the bowl-shaped mirror part and the opening of the cylindrical body part are joined, and the periphery of the opening of the mirror part has a diameter expansion range in which the diameter is increased, The diameter of the cylindrical cross section in the diameter expansion range is 0.5% to 1.3% larger than the diameter of the cylindrical cross section adjacent to the diameter expansion range.

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