JP4628928B2 - Sequential molding method - Google Patents

Description

  The present invention relates to a sequential forming method for gradually processing a plate. In particular, it is suitable for a method of sequentially forming a molded product having a flange at the end of the plate.

  Conventionally, a molded product having a flange at an end portion of a plate is manufactured by placing a plate between a female mold and a male mold and pressing it. It is expensive because it requires female and male molds.

As means for reducing the number of molds, a sequential molding method as shown in FIGS. In this method, the outer peripheral portion of the material is fixed to the female die, the material is pushed with a rod-shaped tool, and moved along the inner peripheral surface of the female die, so that the plate is sequentially stretched. On the other hand, Patent Document 2 performs a drawing process sequentially.
JP-A-11-310371 JP-A-10-76321

  Since the sequential molding method can use a single mold, it can be made inexpensive. However, when a flange is formed at the end of the plate by the method of JP-A-11-310371, the plate remains on the outer peripheral portion of the flange. When this plate is unnecessary, it is necessary to cut and remove the outer peripheral portion of the flange.

  Further, when forming a flange by this processing method, it is not possible to make a right angle even if the angle formed by the flange and the bottom plate is a right angle. For example, when the cylinder is overlapped and joined to the flange, if the flange is not at a right angle, the overlap joining is difficult. In addition, it is difficult to form a high flange.

  On the other hand, when the flange is processed by the processing method of Patent Document 2, wrinkles are likely to occur at the joint between the flange and the flange.

  An object of the present invention is to provide a sequential molding method that can be easily molded into a predetermined shape.

The object is to provide a female mold having an inner peripheral surface for forming the material and having a shoulder portion of the inner peripheral surface formed in an arc shape, and a plurality of recesses on the upper surface inside the female mold. And a seat provided with means for fixing the material from the back side, and a plate-like material is placed on the upper surface of the female mold and the seat, and an end of the material is gripped by the upper surface of the female mold Then, the tool provided above the material is relatively moved along the recess, the tool is relatively moved along the recess, and overhanging is performed, and the tool is placed in the other recess. And moving the tool relatively along the recess to perform overhanging to release the end portion of the material gripped on the upper surface of the female mold and to dispose the back surface of the material on the seat in a state where the fixed to the upper surface, the female to The seat is moved downward, and the tool is relatively moved along a shoulder portion whose inner peripheral surface of the female die is formed in an arc shape, thereby placing the tool on the shoulder portion of the female die. This can be achieved by forming the flange portion by overhanging the formed outer edge portion.

  According to the present invention, in a method of sequentially forming using a female mold and a tool, it can be easily formed into a predetermined shape.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows only the left end portion of the apparatus, and other portions have the same configuration as appropriate. FIG. 2 shows a state during the molding.

  The molded product 10 has a bottom plate 11 and has a flange 12 on the outer periphery thereof. The molded product 10 is composed of four sides, the sides are linear, and the corners 12a where the sides meet are arcuate. The surface of the bottom plate 11 and the surface of the flange 12 are substantially perpendicular. In addition to being used alone, the molded product 10 serves as a lid for the end of the cylindrical member. When the flange 12 and the end portion of the tubular member are overlapped and fixed, it is desirable that the flange 12 and the bottom plate 11 are orthogonal to each other.

  The mold 20 is a female mold (outer mold). The female mold 20 is placed horizontally. A material plate 10 b is placed on the upper surface of the female mold 20. A rod-shaped tool 30 is inserted into the female mold 20. The tool 30 descends along the vertical surface of the female die 20 and then moves along the inner peripheral surface of the female die 20. The shape of the inner peripheral surface of the female die 20 is substantially the same as the outer diameter shape of the molded product 10. When the tool 30 makes one turn, the tool 30 repeats the above. Thereby, the flat plate 10b of the material is drawn. Note that lowering the tool 30 is referred to as moving in the drawing direction. This is substantially the movement of the tool 30 in the axial direction and the movement of the molded product 10 in the depth direction.

  The tip of the tool 30 is flat. The corner from the tip to the side is arcuate. This arc is an arc formed by the bottom plate 11 and the flange 12 of the molded product 10. The tool 30 is suspended from an upper movable body (not shown) so as to be freely rotatable. The tool 30 moves along the inner peripheral surface of the female die 20 (corresponding to the flange 12). As the tool 30 moves in contact with the material 10b, the tool 30 is driven to rotate (spin). As a result, the tool 30 does not contact the material 10b at a single point, so that seizure can be prevented. Moreover, lubricating oil is applied to the upper surface of the material 10b.

  A plurality of positioning pins (guides) 23 for the material 10b are erected on the upper surface of the female die 20. When the flat plate of the material 10b is placed on the upper end of the female mold 20, the pin 23 is in contact with the outer periphery of the material 10b. This positions it. The upper end (referred to as a shoulder portion) on the inner peripheral side of the female die 20 has an arc shape. This arc is along the entire circumference of the female mold 20. By this arc, the outer peripheral portion of the material 10b smoothly moves to the inner peripheral side of the female mold 20.

  There is no bottom inside the female mold 20. Inside the female mold 20 is a seat 40 on which the material 10b is placed. The seat 40 is supported by a device 50 capable of controlling the height position. The seat 40 is also in a portion facing the tip (lower end) of the tool 30. The seat 40 is at a location corresponding to the movement trajectory of the tool 30 in the circumferential direction. That is, the material 10 b is sandwiched between the tip of the tool 30 and the seat 40. Furthermore, the seat 40 is also in the central part of the female mold 20. For this reason, the center part of the raw material 10b can be fixed.

  The seat 40 is fixed by placing the material 10b. This fixing is performed by providing an electromagnet on the seat 40 and using a magnetic force. Alternatively, a vacuum suction pad is provided on the upper surface of the seat 40 and vacuum suction is performed. The fixed position is the center of the seat 40 or the like. The material 10b is made of iron, stainless steel, or aluminum alloy.

  A device 50 for raising and lowering the seat 40 will be described. The device 50 includes a plurality of screw mechanisms 51. FIG. 1 shows a set of screw mechanisms. A seat 45 at the lower end of the seat 40 is supported by a screw rod 52 of a screw mechanism 51. The seat 45 has a rotatable nut. As the driving device 55 rotates, the screw rod 52 rotates and the seat 40 moves up and down. A plurality of guides (not shown) for vertically moving the seat 40 are provided between the seat 40 or the seat 45 and the foundation. The device 50 and the female mold 20 are installed on the foundation.

  A sequential molding method will be described. First, a flat plate material (blank) 10b developed based on the shape after molding is prepared. Since the molded product 10 has a quadrangular shape and arcs at the corners, the plan view of the material 10b is substantially quadrangular and the corners are arc-shaped as shown in FIG. The size and shape of the material 10b and the shape of the corner arc are determined in consideration of the shape of the molded product 10. In the expansion, the expansion dimension is calculated based on the surface area and volume of the molded product in the same manner as the rectangular tube drawing. Based on the developed dimensions, the plate is cut by a turret punch press or the like.

  Next, the material 10 b is placed on the upper end of the female mold 20. At this time, the material 10b is also placed on the raised seat 40. The material 10b is positioned by the pin 23.

  Next, the material 10 b is fixed to the seat 40. The fixing position and means are as described above.

  Next, the seat 40 is lowered, and then the tool 30 is lowered. The lowered position of the tool 30 is a position where the material 10b can be positioned between the side surface of the tool 30 and the vertical surface (inner peripheral surface, straight line portion) of the female die 20. That is, the material 10 b is sandwiched between the inner peripheral surface of the female mold 20 and the side surface of the tool 30. In this state, the tool 30 is lowered and moved in the circumferential direction along the inner peripheral surface of the female die 20 as will be described later. The lowering amount of the tool 30 is a position where the tip of the tool 30 contacts the lowered material 10b. For example, when the upper surface of the seat 40 is flush with the upper surface of the female mold 20 (the position where the end of the material 10b is placed) before the seat 40 is lowered, the tip of the tool 30 is in contact with the upper surface of the material 10b. For example, the descending amount of the seat 40 and the tool 30 is the same. Both can be lowered simultaneously.

  When the bottom plate 11 is wide and the thickness is thin and the center portion of the bottom plate 11 is fixed as in this embodiment, the bottom plate 11 is only bent and the outer peripheral portion is not bent by the female mold 20. Subsequently, the tool 30 is bent when the tool 30 is lowered. For this reason, there exists a possibility that the raw material 10b may incline. Further, as will be described later, when the tool 30 is moved in the circumferential direction, the material 10b may rotate. For this reason, the material 10b is fixed to the seat 40.

The lowered position of the tool 30 is a position where the flange 12 can be positioned between the side surface of the tool 30 and the inner peripheral surface of the female die 20. In addition, the perpendicularity of the flange 12 is considered. When considering the squareness, the tool 30 is positioned so that the material 10b is sandwiched between the side surface of the tool 30 and the inner peripheral surface of the female die 20.
Next, the tool 30 is moved along the inner peripheral surface of the female die 20. The tool 30 rotates in a driven manner. The material 10b is sequentially formed by the movement of the tool 30.

  Next, every time the tool 30 makes one round, the seat 40 is lowered and the tool 30 is lowered as described above. The lowering amount of both and the lowering position of the tool 30 are as described above. Next, the tool 30 is moved in the circumferential direction along the inner peripheral surface of the female mold.

  Thereafter, the lowering of the seat 40 and the tool 30 and the movement of the tool 30 in the circumferential direction are repeated. By repeating the above steps, the outer peripheral portion of the material 10b moves to the inner peripheral surface of the female die 20. Thereby, drawing is performed. The axial direction of the tool 30 is the drawing direction. The moving direction of the tool 30 along the inner peripheral surface of the female die 20 is the radial direction of the tool 30.

  According to this, since the raw material 10b is deformed at a narrow portion between the female die 20 and the tool 30 and sequentially gives only a small and uniform distortion, the flatness of the bottom plate 11 is kept good.

  In addition, since the flange 12 is formed while being restrained by the female mold 20 over the entire circumference, the flange does not swell outward, and a molded product having excellent squareness between the flat plate portion and the flange portion can be manufactured. In particular, the flange of the corner 12a tends to spread outward by molding, but the flange of the corner 12a is constrained from the outside by the female mold 20 as shown in FIG. That is, in the entire range from the beginning to the end of the drawing process, the flange 12 is sandwiched between the inner peripheral surface of the female die 20 and the side surface of the tool 30, so that the drawing is performed by restraining the flange 12 from inside and outside. Can do. Therefore, processing with high accuracy such as perpendicularity can be performed. It can be easily joined when the flange 12 is overlapped and joined to the end of the tube.

Thus, in the sequential molding using the female mold 20, the seat 40 is provided on the inner peripheral side of the female mold 20, and the material 10b is fixed to the seat 40. Therefore, the material 10b can be fixed, and a predetermined molding is performed. It is something that can be done. The same applies to the case where the molding has progressed and the flange 12 is positioned on the vertical surface of the female die 20. Further, drawing is performed while moving the end portion of the material 10b toward the inner peripheral surface of the female die 20, and the end portion of the material 10b is positioned on the inner peripheral surface of the female die 20 to perform drawing processing. Yes. For this reason, the perpendicularity which the flange 12 and the baseplate 11 comprise can be improved. Further, the height of the flange 12 can be increased. In addition, a decrease in the plate thickness of the flange 12 can be suppressed.
In addition, since the end portion of the material 10b is drawn so as to be movable into the female mold 20, if the material 10b is formed in consideration of the shape after molding, it is necessary to cut the end portion of the flange 12 after molding. Absent. Moreover, since it fixes with the seat 40, positioning can be performed with guides, such as the pin 23. FIG.

  Since a high load is not required unlike press molding, the female mold 20 may be a simple one made of a general steel material or the like, and does not require heat treatment such as quenching or a close surface finish like a press mold.

  A processing machine that performs this sequential forming is a numerically controlled processing device, such as an NC milling machine or a machining center. A tool 30 is installed on the spindle of the numerically controlled machining apparatus. The main shaft is moved along the inner peripheral surface of the female die 20 in the vertical direction by numerical control. The numerically controlled machining apparatus in FIG. 1 is a vertical type. The main shaft having the tool 30 can move in the vertical direction and in one horizontal direction. The female mold 20 and the seat 40 are placed on a table (base). The table can move in the horizontal direction perpendicular to the horizontal direction of movement of the spindle. The tool 30 can be moved along the inner peripheral surface of the female die 20 by these two movements. The lifting device 50 is placed on a table. Instead of the movement of the tool 30 in the vertical direction, the table can be raised and lowered.

  An example will be described. The diameter of the tool 30 is 25 mm, the plate thickness of the material 10b is about 0.5 mm to 4 mm, the distance from the inner peripheral surface of the female die 20 to the side surface of the tool 30 is about 0.8 to 2 times the plate thickness, the tool 30 Depression depth per one stroke (amount of lowering of the seat 40 per stroke): 0.5 to 2 times the plate thickness of the material 10b, height of the flange 12: 5 times the plate thickness of the material 10b It is about 20 times. Further, the height of the flange 12 is 20 mm, the radius of the arc portion (shoulder) of the female die 20 is 5.5 to 13.5 mm, the diameter of the tool 30 is 25 mm, the radius of the tip of the tool 30 is 5.5 mm to 10 mm, The radius of the circular arc part 12a: 100 mm.

  The size of the material 10b will be described. As shown in FIG. 1, the end portion of the material 10 b is above the center of the arc R of the shoulder portion of the female mold 20 or is positioned so as to be closer to the center of the female mold 20 than above the center. When larger than this, in the corner | angular part 12a of the flange 12, a crack is easy to generate | occur | produce in the connection part of the flange 12 and the baseplate 11. FIG.

  In the case of the above embodiment, as shown in FIG. 6, wrinkles 12c are likely to occur at the connecting portion between the straight portion 12b and the corner portion 12a of the flange 12. As the height of the flange 12 increases, wrinkles 12c are likely to occur. FIG. 6 shows wrinkles exaggerated for ease of understanding. As shown in FIG. 7, the straight portion of the flange 12 is inclined linearly from the bottom plate 11. As shown in FIG. 8, the flange of the corner 12 a is along the arc of the shoulder of the female mold 20. Therefore, when the wrinkle 12c starts to occur due to the progress of the drawing process, the drawing process is stopped, and a wrinkle suppressing process for allowing the flange 12 to conform to the arc portion of the female die 20 is performed. This will be described below with reference to FIGS. 9A to 9C.

  When the wrinkle 12c is generated, the drawing process of FIG. 9A (that is, FIG. 1) is stopped and the descent of the seat 40 is stopped. Then, as shown in FIG. 9B, the tool 30 is slightly raised and slightly moved to the outside of the female die 20. That is, the tool 30 is circulated in a state where the material 10b is sandwiched between the arc portions of the shoulders of the female mold 20. If necessary, the tool 30 is further raised slightly, moved slightly to the outside of the female mold 20, and the tool 30 is rotated in a state where the material 10 b is sandwiched between the arc portions of the shoulder of the female mold 20. Do this as many times as necessary. Next, as shown in FIG. 9C, the tool 30 is returned to the position shown in FIG. 9A (FIG. 1), and the drawing step shown in FIG. 9A (that is, FIG. 1) is resumed. That is, the seat 40 and the tool 30 are lowered, and the tool 30 is rotated. When the wrinkle 12c starts to occur after resuming the drawing process, the wrinkle suppressing process is resumed.

  The number of times the squeezing process is performed can determine how many wrinkles are generated by experiments, so that a wrinkle suppressing process can be incorporated in the middle of the squeezing process in advance. The lowering of the seat 40 and the tool 30 and one turn of the tool 30 in the circumferential direction of the female die 20 are referred to as a single drawing process.

  In the above embodiment, the tool 30 is lowered after the seat 40 is lowered. However, it can be lowered at the same time. Further, the tip of the tool 30 is not flat and may be spherical. Moreover, the tool 30 does not need to rotate.

  In the above embodiment, the diameter of the tool 30 is uniform in the axial direction. For this reason, the upper end portion of the flange 12 contacts the side surface of the tool 30 until just before the completion of molding. The upper end of the flange 12 contacts the side surface of the tool 30 every time the tool 30 goes around. If this causes inconvenience, the diameter of the tool 30 at a position facing the upper end of the flange 12 is reduced.

  In the above embodiment, the forming is performed sequentially with the material sandwiched between the tool 30 and the seat 40. However, sequential molding in a sandwiched state is not necessary. For this reason, the lowering amount of the seat 40 is made larger than the lowering amount of the tool 30 at a desired time. There is an interval larger than the thickness of the material 10b between the two. After that, both are lowered while maintaining this interval. In the final stage of drawing, the tool 30 and the seat 40 are lowered so that the bottom plate 11 is sandwiched between the tip of the tool 30 and the seat 40. The tool 30 is moved in the circumferential direction while being sandwiched.

  According to this, the outer peripheral portion of the bottom plate 11 is not sandwiched between the seat 40 and the tip of the tool 30 during the sequential forming. For this reason, a part of plate thickness does not become thin. The bottom plate 11 is fixed to the seat 40 in a bent state. In the final stage, the flatness of the bottom plate 11 and the angle between the bottom surface 11 and the flange 12 are made predetermined by sequentially forming the base plate 11 between the seat 40 and the tip of the tool 30.

  Drawing can be performed by fixing the seat 40 and raising the female die 20. The tool 30 also does not move in the vertical direction during molding. The seat 40 is a position in the axial direction of the tool 30 and is along the inner peripheral surface of the female mold 20. In the embodiment of FIG. 1, the vertical load applied by the tool 30 is applied to the seat 40 (elevating device 50). The seat 40 (45) moves in the vertical direction. For this reason, the seat 40 (45) is easily inclined or further lowered from a predetermined position. For this reason, it is difficult to produce an accurate molded product. In order to prevent this, it is necessary to firmly construct the lifting device 50 that supports the seat 40, which is expensive. However, the vertical load due to the tool 30 is not easily applied to the female die 20. For this reason, when the female mold 20 is moved, the above-described problem is less likely to occur, an accurate molded product can be manufactured, and the apparatus can be configured at low cost. In this case, when the female mold 20 is moved, the movement of the tool 30 may be stopped. In addition, when the female mold 20 is moved or before, the tool 30 can be raised, and after the female mold 20 is raised, the tool 30 can be lowered.

  The embodiment of FIG. 10 will be described. The female mold 20 has a bottom surface 21. The width of the bottom surface portion 21 corresponds to the diameter of the tool 30. When the tool 30 is lowered to the lowermost position, the material 10b is sandwiched between the tip of the tool 30 and the bottom surface portion 21. The diameter of the seat 40 is smaller than the inner diameter of the bottom surface portion 21. The lowering amounts of the tool 30 and the seat 40 are substantially the same. The lowering amount of the seat 40 is set such that the bottom plate 11 of the material 10b is not deformed. In the final stage of the drawing process, the height position of the seat 40 is adjusted to the height position of the bottom surface portion 21 of the female mold 20. The tool 30 is moved along the inner peripheral surface of the female die 20 with the material 10b sandwiched between the tip of the tool 30 and the bottom surface portion 21.

  According to this, it suffices to make only the female die 20 to withstand the drawing of the tool 30.

When the size of the outer peripheral portion of the seat 40 is larger than the size of the inner peripheral portion of the bottom surface portion 21 of the female mold 20, and the seat 40 is lowered most, the outer peripheral portion of the seat 40 becomes the bottom surface portion 21 of the female mold 20. Make it appear. According to this, since the seat 40 is supported by the female mold 20 that does not move in the final processing stage, the occurrence of the above-described problems can be suppressed. Further, the material 10b can always be sandwiched between the seat 40 and the tool 30.

  Further, when the seat 40 is fixed and the female die 20 is moved, the seat 40 is provided along the axial direction of the tool 30 and the circumferential direction of the inner peripheral surface of the female die 20. When the female mold 20 is raised most, the material 10b is sandwiched between the outer periphery of the seat 40 and the tool 30. According to this, since the material 10b is supported by the seat 40 which does not move in the final processing stage, the occurrence of the above-described problem can be suppressed.

  The embodiment of FIG. 11 will be described. This embodiment is a case where the height of the flange 12 is increased in the above embodiment. The movement of the seat 40 and the lowering of the tool 30 are the same as in the previous embodiment. The differences will be mainly described below.

  The arc on the inner peripheral side of the upper end of the female mold 20 is relatively large. The arc expands upward. The material 10 b is placed on the female mold 20 and fixed to the seat 40. The movement of the tool 30 will be mainly described. When the outer end portion of the material 10b is placed on the female die 20, the outer end portion of the material 10b is sandwiched between the arc portion of the female die 20 and the tip portion of the tool 30. Thus, the tool 30 is moved along the circumferential direction of the female die 20. After one round, the tool 30 is moved along the arc portion of the female die 20 to the inner circumferential side (downward side). The tool 30 is moved along the circumferential direction of the female die 20 with the material 10b sandwiched between the arc portion of the female die 20 and the tip of the tool 30. As in the embodiment of FIG. 1, when the tool 30 is lowered, the seat 40 is lowered.

  When the tool 30 passes through the arc portion of the female die 20 in this way, the tool 30 is positioned at the same position as in the embodiment of FIG. That is, the tool 30 is moved in the circumferential direction of the female die 20 with the material 10 b positioned between the side surface of the tool 30 and the inner peripheral surface of the female die 20. The subsequent steps are the same as in the embodiment of FIG.

  That is, the tool 30 is moved along the arc R extending from the upper surface of the female die 20 to the inner peripheral surface while being pressed by the tip of the tool 30 from the outer peripheral portion of the material 10 b placed on the upper surface of the female die 20. Then, the material 10 b is positioned between the vertical surface of the female mold 20 and the side surface of the tool 30. This movement is performed by numerical control.

  According to this, since the outer peripheral portion of the material 10b is molded while conforming to the arc of the shoulder of the female die 20, wrinkles can be suppressed and drawing with a high flange height can be realized. In particular, when the corner 12a of the flange 12 is formed, it can be formed while preventing the generation of wrinkles.

  The embodiment of FIG. 12 will be described. A presser seat 60 that restrains the outer peripheral portion of the material 10 b to the female mold 20 is provided. The bolt 62 presses the presser seat 60 against the upper surface of the female die 20 via the coil spring 61. In this state, sequential molding is performed in the same manner as in the embodiment shown in FIG. The presser seat 60 presses the material 10b to the female die 20 so that the end of the material 10b moves to the inner peripheral side of the female die 20 by drawing. By increasing the drawing depth, the outer peripheral portion of the material 10 b is released from the presser seat 60 and the restraint is released, and the end of the material 10 b is located on the inner peripheral surface of the female die 20.

  The embodiment of FIG. 13 will be described. The tool 30 includes a ring 35 corresponding to the presser seat 60. The outer diameter of the ring 35 is larger than the outer diameter of the tool 30. The ring 35 is pressed downward by a coil spring 36. The ring 35 can move axially relative to the tool 30. Reference numeral 38 denotes a cylindrical member fixed to the ring 35 to prevent the ring 35 and the like from coming off. The flange 38b at the upper end of the member 38 is caught by the flange 30e of the large diameter portion 30D of the tool 30. 37 is a seat. The position of the tool 30 is the same as in the embodiment of FIG.

  According to this, in the initial stage of molding, the ring 35 presses the outer peripheral portion of the material 10 b against the upper end portion of the female die 20. For this reason, the outer peripheral part of the raw material 10 b is molded while conforming to the arc part at the upper end of the female mold 20. For this reason, wrinkle generation can be suppressed and drawing with a high flange height can be realized.

  The embodiment of FIG. 14 will be described. The material 10e is a preform material formed in advance into a shape approximate to a target shape obtained by sequential forming. The flange 12e at the outer peripheral portion of the preform material 10e expands upward in a trumpet shape. In the initial stage, the flange 12 e is in contact with the arc portion at the upper end of the female mold 20. The position of the tool 30 is the same as in the embodiment of FIG.

  Since the flange 12e having a finally required length is inclined and provided in advance, it is possible to prevent the generation of wrinkles and the cracking of the plate of the sequentially formed portion. The preform material 10e is manufactured by press molding or sequential molding.

  The embodiment of FIG. 15 will be described. The preform material 10g is preformed so that the outermost peripheral portion thereof substantially coincides with the inner peripheral surface of the female mold 20. The flange 12g is expanded in a trumpet shape. The upper end portion of the flange 12g is placed on the arc portion of the female die 20. 10 g of the preform material is placed on the seat 40 and fixed. The tip of the tool 30 is brought into contact with the bottom plate of the preform material 10g. A bottom plate of the preform material 10 g is sandwiched between the tip of the tool 30 and the seat 40. The side surface at the tip of the tool 30 is positioned at the boundary between the bottom plate of the material 10g and the flange 12g.

  In this state, the tool 30 is moved toward the vertical surface of the female die 20, and then moved in the circumferential direction along the vertical surface of the female die 20. That is, the tool 30 is rotated once so as to push the flange portion outward. The gap with the female die 20 is narrowed by about 0.5 to about 2 times the plate thickness every round. The seat 40 does not descend.

  The preform material 10g can be manufactured by sequential molding as in the embodiment of FIG. And it can shape | mold sequentially like the Example of FIG. 14 or FIG.

  The embodiment of FIGS. 16 and 17 will be described. The flange 112 in this embodiment is only on one side of the square. It is not present on all of the outer periphery of the material 110. The side with the flange 112 is arcuate. The material 110 is an extruded shape of an aluminum alloy and has a rib 110r on the upper surface side. The rib has a T-shaped cross section.

  The ribs 110r where the flange 112 is provided are removed by cutting in advance. Further, since the thickness of the face plate 111 of the profile 110 is generally thicker than the thickness suitable for sequential forming, the face plate 111 in the portion where the flange 112 is provided is cut into a thin plate 111b. This cutting is performed by, for example, an end mill. The cutting range of the face plate 111 and the rib 110r is L, which is determined from the moving range of the tool 130.

  The female mold 120 only needs to have the flange 112 portion. Reference numeral 150 denotes a constraining metal fitting that fixes the face plate 111 of the shape member 110 between the seats 140. The metal fitting 150 sandwiches the shape face plate 111 and the seat 140 from above and below. If the face plate 111 may be pierced, it can be fixed to the seat 140 with bolts and nuts.

  Since the flange 112 is only in a part, the rod-shaped tool 130 does not have to be rotated along the inner peripheral surface of the female die 120. What is necessary is just to make it reciprocate like the arrow of FIG. Sequential molding can be performed by both reciprocating motions. The flange to be sequentially formed can be processed even when it is on three sides or on two opposite sides with respect to a rectangular material.

  The embodiment of FIGS. 18 and 19 will be described. As shown in FIG. 18, the molded product of this embodiment has a flange 212 at the end of the bottom plate 211, and a plurality of rows of ribs 215 on the bottom plate 211. The bottom surface of the rib 215 is relatively wide. The flange 212 has four sides of a substantially rectangular bottom plate. The rib 215 protrudes on the opposite side to the protruding direction of the flange 212.

The manufacturing process will be described with reference to FIG. The flat material 210b is placed on the female die 220 and the seat (die) 240, and the ends of the four sides of the material 210b are fixed to the female die 220 by the metal fittings 225. The upper surface of the female mold 220 and the upper surface of the seat 240 are substantially at the same height. The upper surface of the seat 240 has a plurality of rows of recesses 245 having a size corresponding to the ribs 215. The depth of the recess 245 is greater than the height of the rib 215. (FIG. 19 (A))
The tool 30 is positioned at a position where the rib 215 is provided, the tool 30 is lowered, the tool 30 is moved in the circumferential direction along the recess 245, and the rib is provided. This process can be said to be an overhang process. When the tool 30 makes one turn along the recess 245, the tool 30 is moved to a position where another rib 215 is provided, and the overhanging process is performed in the same manner. In this way, the ribs 215 are sequentially provided. Note that the lowering amount of the tool 30 is smaller than the height of the rib 215.

When the tool 30 is rotated once along all the recesses 245, the tool 30 is further lowered and is rotated once along the recesses 245. Similarly, the operation is performed at other rib positions. Repeat this as many times as necessary. In this manner, all the ribs are formed little by little. (Fig. 19B)
When the predetermined rib 215 is formed, the material 210b is fixed to the seat 240 by an electromagnet or vacuum suction, except for the metal fitting 225. (Fig. 19 (C))
Next, the drawing process for providing the flange 212 at the end of the material 210b is performed as in the above embodiment by moving the tool 30 and the female mold 220 (or the seat 240) (FIG. 19D). If the molded product is large, it is desirable to fix the seat 240 and move the female mold 220.

  18 and 19 can be used when a plurality of ribs 215 are provided without providing a flange. The material 210b may be fixed to the seat 240.

  The case where the cross-sectional shape of the rib 215 is substantially triangular will be described. The lowering position of the tool 30 is set so that there is a gap larger than the plate thickness between the end of the recess 245 of the seat 240 and the side surface of the tool 30. Further, a predetermined arc is formed at the connecting portion between the rib 215 and the bottom plate 211. In the above embodiment, there are flanges 212 on four sides, but the same can be done when there are flanges on only three sides.

  The embodiment of FIGS. 20 and 21 will be described. As shown in FIG. 20, the molded product of this embodiment has a flange 312 at the end of the bottom plate 311, and a plurality of rows of ribs 315 on the bottom plate 311. The bottom surface of the rib 315 is relatively wide. The rib 315 protrudes in the same direction as the protruding direction of the flange 312.

The manufacturing process will be described with reference to FIG. The flat material 310b is placed on the female die 320 and the seat (die) 340, and the ends of the four sides of the material 310b are pressed and fixed to the female die 320 by the metal fitting 225. The upper surface of the female mold 320 and the upper surface of the seat 340 are substantially at the same height. A plurality of convex portions 345 having a size corresponding to the ribs 315 are provided on the upper surface of the seat 340 so as to protrude upward. The size (width, length, height) of the convex portion 345 is substantially the same as the size (width, length, height) of the rib 315. (FIG. 21 (A))
From the position where the rib 315 is provided and the tip of the tool 30 contacts the upper surface of the material 310b, the tool 30 and the female die 320 are lowered, the tool 30 is moved along the convex portion 345, and the rib Is provided. This process can be said to be an overhang process. When the tool 30 makes one round along the convex portion 345, the tool 30 is moved to a position where another rib 315 is provided, and the overhanging process is performed in the same manner. In this way, the ribs 315 are sequentially provided. Note that the lowering amount of the tool 30 is smaller than the height of the rib 315.

When the tool 30 is rotated once along all the convex portions 345, the tool 30 and the female die 320 are further lowered and are rotated once along the convex portion 345. Similarly, the operation is performed at other rib positions. Repeat this as many times as necessary. In this manner, all the ribs are formed little by little. (Fig. 21 (B))
When the predetermined rib 315 is formed, the material 310b is fixed to the seat 340 by an electromagnet or vacuum suction, except for the metal fitting 225. (Fig. 21 (C))
Next, the drawing process for providing the flange 312 at the end of the material 310b is performed as in the above embodiment by moving the tool 30 and the female mold 320 (or the seat 340). (FIG. 21D) Since the female mold 320 is moved when the convex portion 345 is formed, the structure can be simplified by moving the female mold 320 also when the flange 320 is formed.

  The embodiment of FIGS. 20 and 21 can be used when a plurality of ribs 215 are provided without providing a flange.

  The embodiment of FIG. 22 will be described. A burring 418 is provided around the hole 417 of the molded product 410. The protruding direction of the burring 418 is opposite to the protruding direction of the flange 412 on the outer peripheral portion of the molded product 410. Burring is performed on a material provided with holes 417 for burring 418. The processing procedure is the same as in the case of FIG. The recess 245 becomes a recess for the burring 418. The same applies when a plurality of burrings are provided.

  When the protruding direction of the burring is the same as the protruding direction of the flange 412 on the outer peripheral portion of the molded product, the same procedure as in FIG. 21 is performed. The convex part 345 becomes a convex part for burring. The same applies when a plurality of burrings are provided.

  The present invention can also be applied to a case where a vacuum suction pad or an electromagnet is provided on the male mold, the material is fixed by this, and the outer periphery of the material is sequentially formed with a tool along the outer periphery of the male mold.

  The technical scope of the present invention is not limited to the language described in each claim of the claims or the language described in the section of the means for solving the problem, and includes a range that can be easily replaced by those skilled in the art. It extends.

It is a longitudinal cross-sectional view of the principal part of the shaping | molding apparatus of one Example of this invention. It is a perspective view which shows the relationship between the female die in the middle of shaping | molding, a rod-shaped tool, and a to-be-processed object. It is a top view which shows the processing state of the circular arc part of FIG. It is a perspective view of a molded product. It is a top view of a raw material. It is a top view of the circular arc part of a molded product. It is VII-VII sectional drawing of FIG. It is VIII-VIII sectional drawing of FIG. It is a figure explaining the aperture_diaphragm | restriction process of the other Example of this invention. It is a longitudinal cross-sectional view of the principal part of the other Example of this invention. It is a longitudinal cross-sectional view of the principal part of the other Example of this invention. It is a longitudinal cross-sectional view of the principal part of the shaping | molding apparatus of the other Example of this invention. It is a longitudinal cross-sectional view of the principal part of the shaping | molding apparatus of the other Example of this invention. It is a longitudinal cross-sectional view of the principal part of the other Example of this invention. It is a longitudinal cross-sectional view of the principal part of the other Example of this invention. It is a top view of the principal part of the other Example of this invention. FIG. 17 is a side view of the shaped member after forming in FIG. 16. It is a perspective view of the molded product of the other Example of this invention. It is a figure explaining the manufacturing process of the molded article of FIG. It is a perspective view of the molded product of the other Example of this invention. It is a figure explaining the manufacturing process of the molded article of FIG. It is a perspective view of the molded product of the other Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Molded article, 10b, 110, 210b, 310b ... Material, 11, 211, 311 ... Bottom plate, 12, 112, 212, 312, 412 ... Flange, 12a ... Corner of flange, 20, 120, 220, 320 ... Female mold, 21 ... bottom face of female mold, 30 ... rod-shaped tool, 35 ... presser fitting, 36 ... spring, 40, 140, 240, 340 ... seat, 50 ... lifting device, 60 ... presser seat, 111 ... face plate, 130 ... Bar-shaped metal fittings, 150, 225 ... Fixing metal fittings, 215, 315 ... Ribs, 245 ... Concave parts, 345 ... Convex parts, 417 ... Holes, 418 ... Burrings.

Claims (2)

An inner peripheral surface for forming the material is provided and a shoulder portion of the inner peripheral surface is formed in an arc shape, and the inner surface of the female die is provided with a plurality of recesses on the upper surface, A seat provided with means for fixing the material from the back side;
A flat plate material is placed on the upper surface of the female mold and the seat, and an end of the material is held on the upper surface of the female mold,
Relatively moving the tool provided above the material along the recess,
The tool is relatively moved along the recess to perform overhang processing,
Move the tool to the other recess, move the tool relatively along the recess, and perform overhang processing,
While releasing the end of the material gripped on the upper surface of the female mold, and moving the seat downward relative to the female mold with the back surface of the material fixed to the upper surface of the seat,
The outer edge portion of the material disposed on the shoulder portion of the female mold is stretched by moving the tool relatively along the shoulder portion whose inner peripheral surface of the female mold is formed in an arc shape. To form a flange part,
A sequential molding method characterized by that.   2. The sequential molding method according to claim 1, wherein the means for fixing from the back surface of the material is an electromagnet or a vacuum suction pad provided on the upper surface of the seat.

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