JP6216894B1 - Cylindrical member forming device - Google Patents

Abstract

A workpiece (W) having a cylindrical shape is prepared, a holding step for attaching the workpiece to the workpiece holding mechanism (120), and an inner surface and an outer surface of the workpiece are respectively rotated while rotating the workpiece around the workpiece rotation axis (X). A pressing step for pressing from both sides of the inner surface and the outer surface in a state of being sandwiched between the inner pressing member (158) and the outer pressing member (138), and maintaining the pressing in the pressing step, the outer pressing member is pressed against the inner pressing member. And a molding step of moving the member relative to the member in a direction along the workpiece rotation axis.

Description

The present invention relates to an apparatus for forming a metal cylindrical member, in particular, to an apparatus for molding a cylindrical member in the radial direction.

In an aircraft engine, a fan case that covers the outer periphery of a rotating fan is manufactured by molding a cylindrical metal member into a predetermined shape.
When such a cylindrical member is formed, conventionally, a cylindrical or cylindrical mold (core) is disposed inside the cylindrical member, and the cylindrical member is rotated while rotating the mold and the cylindrical member. A spinning process is known in which a cylindrical member is formed into a predetermined shape along the outer periphery of the mold by pressing and deforming the cylindrical member in the direction of the central axis of the mold with a roller-shaped pressing tool from the outside of the mold ( Patent Document 1).

JP 2011-56551 A

In the spinning process described in Patent Document 1, since a predetermined outer peripheral shape is formed on the mold inserted inside as the core of the cylindrical member, the cylindrical member is pressed only from the outside to It can only deal with processing along the outer periphery, that is, reducing the diameter of the cylindrical member.
In addition, since the shape of the cylindrical member after processing depends on the outer peripheral shape of the mold, if the inner diameter of the cylindrical member itself increases, the outer diameter of the mold as the core increases, and the material cost of the mold increases accordingly. And processing cost will increase.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cylindrical member molding apparatus that can downsize a mechanism that supports the inner surface of a cylindrical member and can also press and deform the cylindrical member from the inside of the cylindrical member.

A cylindrical member forming apparatus according to the present invention is provided adjacent to the base, the workpiece holding mechanism rotatably provided around a workpiece rotation axis orthogonal to the upper surface of the base, and the workpiece holding mechanism on the base. An outer pressing mechanism, a side support mechanism provided at a position surrounding the work holding mechanism on the base, and an inner pressing mechanism provided in the vicinity of the work rotation shaft so as to face the outer pressing mechanism. The workpiece holding mechanism includes: a motor attached to the base; one end clamp member attached to the output shaft of the motor; and the other end clamp member disposed apart from the one end clamp member. And the outer pressing mechanism includes an outer pressing member that presses an outer surface of a work held by the work holding mechanism, and the outer pressing member attached to one end. And an elevating mechanism for moving the outer arm in a direction approaching or separating from the base, and the inner pressing mechanism is the same as the work rotation axis. A shaft member having an axis, an inner pressing member that presses the inner surface of the workpiece, and an inner arm that attaches the inner pressing member to one end and moves forward and backward in the radial direction from the shaft member. .

As an example of the cylindrical member molding apparatus according to the present invention, a plurality of the inner pressing mechanisms are provided at equal intervals in the circumferential direction around the shaft member, and the outer pressing mechanisms are the inner pressing mechanisms provided in the plurality. The side support mechanism is arranged to face the remaining one of the plurality of inner pressing mechanisms that does not face the outer pressing mechanism.
At this time, a plurality of the outer pressing mechanisms may be provided in the circumferential direction of the workpiece.

As another example of the cylindrical member forming apparatus according to the present invention, it is preferable that the outer pressing member and the inner pressing member are both formed of rollers.
The elevating mechanism of the outer pressing mechanism may further include a rotating mechanism that can freely change a moving axis for moving the outer arm forward and backward within a plane in which the elevating mechanism moves up and down.
Furthermore, it is good also as a structure provided with the heating mechanism which heats the said workpiece | work.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the mechanism which supports the inner surface of a cylindrical member, a cylindrical member can be press-deformed also from the inner side of a cylindrical member.

It is a figure which shows the outline of the shaping | molding apparatus which implements the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: A top view is shown. It is a figure which shows the outline of the shaping | molding apparatus which implements the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: Sectional drawing in the AA cross section of FIG. 1A is shown. It is a figure which shows the outline of the shaping | molding apparatus which enforces the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: Sectional drawing in the BB cross section of FIG. 1B is shown. It is principal part sectional drawing of the process point vicinity which shows the operation | movement performed with the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: The state of a holding | maintenance step is shown. It is principal part sectional drawing of the process point vicinity which shows the operation | movement performed with the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: The 1st step in process is shown. It is principal part sectional drawing of the process point vicinity which shows the operation | movement performed with the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: The 2nd step in process is shown. It is principal part sectional drawing of the process point vicinity which shows the operation | movement performed with the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: The 3rd step in process is shown. It is principal part sectional drawing of the process point vicinity which shows the operation | movement performed with the shaping | molding method of the cylindrical member by Example 1 of this invention, Comprising: The state after a process is shown. It is principal part sectional drawing which shows the modification of the shaping | molding method and shaping | molding apparatus of the cylindrical member by Example 1 of this invention. It is a top view which shows the outline of the shaping | molding apparatus which enforces the shaping | molding method of the cylindrical member by Example 2 of this invention. It is a top view which shows the outline of the shaping | molding apparatus which enforces the shaping | molding method of the cylindrical member by Example 3 of this invention.

<Example 1>
1A and 1B are diagrams schematically illustrating a molding apparatus that performs a cylindrical member molding method according to a first embodiment of the present invention. FIG. 1A is a top view, and FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG. 1C is a cross-sectional view taken along the line BB of FIG. 1B.
A cylindrical member forming apparatus 100 shown in FIG. 1 expands or contracts a cylindrical workpiece W in a radial direction with respect to a central axis X (the same as a workpiece rotation axis X described later). W is formed into an arbitrary shape, and includes a base 110 and a work holding mechanism 120 provided so as to be rotatable around a work rotation axis X orthogonal to the upper surface of the base 110 in a direction indicated by reference sign R; An outer pressing mechanism 130 provided adjacent to the workpiece holding mechanism 120, a side support mechanism 140 provided at a position surrounding the workpiece holding mechanism 120, and a workpiece rotation axis X side facing the outer pressing mechanism 130. And a control device (not shown) for controlling the operation of the mechanism described above.

As shown in FIG. 1B, the base 110 is attached to an upper portion of a housing 112 placed on the floor surface of a factory, and the upper surface thereof is a work holding mechanism 120, an outer pressing mechanism 130, a side support mechanism 140 or It functions as a table on which the inner pressing mechanism 150 and the like are arranged.
A motor 122 having an output shaft 122 a that passes through the base 110 is attached to the housing 112.

The work holding mechanism 120 includes the motor 122 described above, a support plate 124 attached to the output shaft 122a of the motor 122, and a one-end clamp member 126 that is attached to the support plate 124 and holds one end of the work W. , And the other end clamp member 128 that is spaced apart from the one end clamp member 126.
The support plate 124 is a disc fixed to the end portion of the output shaft 122a of the motor 122, and is a member that rotates with the rotation of the output shaft 122a.
Further, the output shaft 122 a is disposed so as to penetrate a shaft member 152 of an inner pressing mechanism 150 described later, and the bottom surface of the support plate 124 is supported on the upper surface of the shaft member 152.

The one-end clamp members 126 are arm-shaped members arranged radially from the workpiece rotation axis X at equal intervals in the circumferential direction, and are fixed integrally to the lower surface of the support plate 124, respectively.
Further, clamp claws 126 a for clamping one end (upper end) of the workpiece W are provided on the lower surface of the one end clamp member 126.

The other end clamp member 128 is a disk-shaped member having a through hole through which the motor output shaft 122a and the shaft member 152 are inserted in the center, and is provided on the base 110 so as to be rotatable about the workpiece rotation axis X. Supported.
In addition, clamp claws 128 a that clamp the other end (lower end) of the workpiece W are provided on the upper surface of the other end clamp member 128.

As shown in FIG. 1B, one end of the workpiece W is clamped to the clamp pawl 126a of the one end clamp member 126 and the other end of the workpiece is clamped to the clamp pawl 128a of the other end clamp member 128. By placing the workpiece W on the workpiece 110, the workpiece holding mechanism 120 rotates around the workpiece rotation axis X in the direction of reference sign R while holding the workpiece W.
Here, the clamp pawl 126a of the one end clamp member 126 and the clamp pawl 128a of the other end clamp member 128 are configured so that their mounting positions can be changed in the radial direction according to the diameter of the workpiece W.

The outer pressing mechanism 130 includes a main body 132 standing upright from the base 110, an elevating mechanism 134 attached to the main body 132 and moving in a direction approaching or separating from the base 110, and an elevating mechanism 134 attached to the elevating mechanism 134. An outer arm 136 that moves forward and backward in the direction toward the workpiece rotation axis X, and an outer pressing member 138 that is attached to one end of the outer arm 136 and that contacts and presses the outer surface of the workpiece W are included.
The main body 132 includes a guide (not shown) such as a rail along the direction of the arrow D2 along which the elevating mechanism 134 moves, and a drive source (not shown) for elevating the elevating mechanism 134 inside. ).

The elevating mechanism 134 is attached to the side surface of the main body 132 described above, and elevates in the direction of the arrow D2, and advances and retreats the outer arm 136 in the direction of the arrow D1 (direction toward the workpiece rotation axis X). A mechanism (not shown) is incorporated.
Here, as an advancing / retreating mechanism for advancing / retreating the outer arm 136, any means may be employed as long as it can press the outer pressing member 138 against the workpiece W and can counter the reaction force from the workpiece W during molding. For example, a hydraulic piston or a rack and pinion mechanism can be exemplified.

One end of the outer arm 136 is attached to the advance / retreat mechanism of the lifting mechanism 134 described above, and a slit having a U-shaped cross section is formed at the other end in a side view, and the rotation axis C1 (see FIG. 1C) is formed in the slit. An outer pressing member (outer roller) 138 that rotates about the center is attached.
The outer pressing member 138 is a roller that rotates while contacting and pressing the outer surface of the workpiece W, and is formed in a flat shape having an elliptical cross section as shown in FIG. 2, for example, in order to perform more local pressing. The

Then, when the outer pressing member 138 comes into contact with the outer surface of the workpiece W that rotates during processing, the outer pressing member 138 rotates around the rotation axis C1 and continuously presses the outer surface of the workpiece W with the side surface.
With such a configuration, the outer pressing mechanism 130 maintains the contact between the outer pressing member 138 and the workpiece W by moving the lifting mechanism 134 in the direction of the arrow D2 while moving the outer arm 136 in the direction of the arrow D1. In this state, the machining position is moved from the position P1 indicated by the dotted line in FIG. 1B to the position P2 indicated by the broken line.

The side support mechanism 140 includes a main body 142 that stands upright from the base 110, a side support arm 144 that is attached to the side of the main body 142 and moves forward and backward in the direction toward the workpiece rotation axis X, and one end of the side support arm 144. And a side roller 148 attached to the side roller support member 146 and contacting and supporting the outer surface of the workpiece W.
The main body 142 has a built-in advance / retreat mechanism (not shown) that advances and retracts the side support arm 144 in the direction of the arrow D3 (the direction toward the workpiece rotation axis X) on the side surface.

One end of the side support arm 144 is attached to the advancing / retreating mechanism of the main body 142 described above, and a side roller support member 146 having a U-shaped cross section in side view is attached to the other end.
A side roller 148 that rotates about a rotation axis C2 (see FIG. 1C) passing through two opposing surfaces is attached to the side roller support member 146.

The side roller 148 is a cylindrical roller having a height corresponding to the machining width of the workpiece W along the workpiece rotation axis X (see symbol H in FIG. 2A), and its cross-sectional shape is as shown in FIG. 1B. Further, the inner pressing member 158 of the inner pressing mechanism 150 to be described later is formed so as to have a continuously changing diameter corresponding to the cross-sectional shape.
Then, when the side roller 148 comes into contact with the outer surface of the workpiece W that rotates during processing, the side roller 148 rotates around the rotation axis C <b> 2, and guides the rotation of the workpiece W so as to sandwich the workpiece W with the inner pressing member 158. .

The inner pressing mechanism 150 includes a shaft member 152 standing upright from the base 110, an inner arm 154 that is attached to a side surface of the shaft member 152 and moves forward and backward in the direction toward the workpiece rotation axis X, and is attached to one end of the inner arm 154. And an inner pressing member 158 attached to the inner supporting member 156 and contacting and pressing the outer surface of the workpiece W.
The shaft member 152 is a cylindrical member having the same axis as the workpiece rotation axis X, and the output shaft 122a of the motor 122 of the workpiece holding mechanism 120 is inserted into the shaft member 152 as described above.

One end of the inner arm 154 is attached to the side surface of the shaft member 152, and an inner support member 156 having a U-shaped cross section in the side view is attached to the other end.
Further, the inner arm 154 has a built-in advance / retreat mechanism (not shown) that advances and retracts the inner support member 156 in the direction of the arrow D4 (the direction toward the workpiece rotation axis X).

The inner pressing member 158 is a cylindrical roller having a height corresponding to the machining width of the workpiece W along the workpiece rotation axis X (see symbol H in FIG. 2A), and the cross-sectional shape thereof is shown in FIG. 2E. Thus, it forms so that it may become a diameter which changes continuously corresponding to the section shape of work W after processing.
Here, as an example of the inner pressing member (inner roller) 158, a case will be described in which a cross-sectional shape that has two step portions after processing and has a shape that reduces the diameter in two steps is employed.

The inner pressing member 158 is attached so as to rotate around a rotation axis C3 (see FIG. 1C) passing through two opposing surfaces of the inner support member 156.
Then, when the inner pressing member 158 comes into contact with the inner surface of the workpiece W rotating during processing, the inner pressing member 158 rotates around the rotation axis C3 and sandwiches the workpiece W between the outer pressing member 138 or the side rollers 148. Guide the rotation.

As shown in FIGS. 1A to 1C, in the cylindrical member forming apparatus 100 according to the first embodiment of the present invention, the inner pressing member 158 of the inner pressing mechanism 150 has four equal intervals in the circumferential direction of the shaft member 152. It is arranged in each place.
Then, the outer pressing member 138 is located at a position facing one of the four inner pressing members 158, that is, the advancing / retreating direction of the outer pressing member 138 (reference numeral D1 in FIG. 1B) and the inner side. It arrange | positions so that the advancing / retreating direction (code | symbol D4 of FIG. 1B) of the press member 158 may align on the same straight line.
At this time, as an advance / retreat mechanism for advancing / retreating the inner pressing member 158 facing the outer pressing member 138, the inner pressing member 158 is pressed against the workpiece W as well as from the workpiece W at the time of molding as in the case of the outer pressing mechanism 130. The one that can counter the force is adopted.

On the other hand, the side roller 148 described above is disposed at a position facing the inner pressing member 158 that does not face the outer pressing member 138.
At this time, the advancing / retreating direction of the side roller 148 (symbol D3 in FIG. 1B) and the advancing / retreating direction of the inner pressing member 158 (symbol D4 in FIG. 1B) are similarly arranged on the same straight line.

With these arrangements, a pressing force is applied to the workpiece W from the outer surface side by the outer pressing member 138 and a pressing force is also applied from the inner surface side by the inner pressing member 158.
Then, by controlling the pressing force of the outer pressing member 138 and the pressing force of the inner pressing member 158 with a control device, it is possible to arbitrarily perform a spinning process for expanding or reducing the diameter of the rotating workpiece W. .

Further, as shown in FIG. 1B, the height of the outer pressing member 138 in the direction of the rotation axis C1 is set to be sufficiently smaller than the height of the inner pressing member 158 in the direction of the rotation axis C3.
As a result, the outer pressing member 138 and the inner pressing member 158 correspond to a “spar (contact tool)” and a “mandrel (core)” in a general spinning process, respectively, and the outer surface of the inner pressing member 158 The shape can be transferred to the workpiece W.

On the other hand, the side roller 148 and the inner pressing member 158 facing the side roller 148 are loaded with a pressing force that can maintain contact with the outer surface or the inner surface of the workpiece W.
This functions to guide the rotation of the workpiece W while following changes in the diameter and shape of the workpiece W.

Next, with reference to FIG. 2, an outline of operations performed in the cylindrical member forming method according to the first embodiment of the present invention will be described.
FIG. 2 is a cross-sectional view of a main part in the vicinity of a processing point showing an operation executed in the method for forming a cylindrical member according to the first embodiment of the present invention. FIG. 2A shows a state of a holding step, and FIG. 2C shows the second stage during processing, FIG. 2D shows the third stage during processing, and FIG. 2E shows the state after processing.

As shown in FIG. 2A, in the cylindrical member forming method according to the first embodiment of the present invention, a cylindrical workpiece W is first prepared and attached to the workpiece holding mechanism 120.
Specifically, one end (the upper end in the figure) of the workpiece W is clamped by the clamp claw 126a of the one end clamp member 126, and the other end (the lower end in the figure) is clamped by the clamp claw 128a of the other end clamp member 128. Then, the one-end clamp member 126 is attached to the support plate 124 (not shown).
At this time, the radial positions of the clamp claws 126a and 128a are adjusted according to the workpiece W, and are fixed at the adjusted positions during processing.

Subsequently, the outer pressing mechanism 130, the side support mechanism 140, and the inner pressing mechanism 150 are driven, and the outer pressing member 138 and the inner pressing member 158 are opposed to each other in the immediate vicinity of the workpiece W.
Here, as shown in FIG. 2A, the inner pressing member 158 has stepped portions 158a and 158b in the middle, and gradually decreases in diameter as it reaches the first region H1, the second region H2, and the third region H3. And formed as a roller having a height H.
Similarly, the side roller 148 and the inner pressing member 158 are opposed to each other in the immediate vicinity of the workpiece W even at a position where the side support mechanism 140 that is not a processing point is installed.

Subsequently, as shown in FIG. 2B, as a first-stage forming process, the inner pressing member 158 is processed in the first region H1.
Specifically, while rotating the workpiece W attached to the workpiece holding mechanism 120 in the direction indicated by the arrow R, the outer pressing member 138 from the outer surface side of the workpiece W, the inner pressing member 158 from the inner surface side of the workpiece W, The workpiece W is contacted and pressed (pressing step).
At this time, by individually controlling the pressing force applied by the advancing / retreating mechanism of the outer pressing member 138 and the advancing / retreating mechanism of the inner pressing member 158, it is possible to select a process for reducing the diameter of the workpiece W to the inside or expanding the diameter to the outside. It becomes.

Then, in a state where the workpiece W is sandwiched between the outer pressing member 138 and the inner pressing member 158 and the pressing force is maintained, the processing point (the point where the end surface of the outer pressing member 138 contacts the outer surface of the workpiece W) WP is, for example, the first. The elevating mechanism 134 and the outer arm 136 are driven so as to move from the lower end to the upper end of the region H1 (molding step).
Thereby, the shaping | molding process which transfers the shape of the outer peripheral surface in the 1st area | region H1 of the inner side press member 158 to the workpiece | work W is performed. That is, for example, when the step portion 158a is formed on the inner pressing member 158, the bent portion F1 is formed on the workpiece W.

Subsequently, as shown in FIG. 2C, subsequent to the first stage molding process, the second stage molding process in the second region H2 of the inner pressing member 158 is performed.
Specifically, while maintaining the rotation of the workpiece W, the pressing force of the outer pressing member 138 and the inner pressing member 158 is reset, and the inner and outer surfaces of the workpiece W are pressed (pressing step).

Then, with the workpiece W sandwiched between the outer pressing member 138 and the inner pressing member 158 and maintaining the pressing force, the lifting mechanism 134 and the outer arm 136 are moved so that the processing point WP moves from the lower end to the upper end of the second region H2. Is driven (molding step).
Thereby, the shaping | molding process which transfers the shape of the outer peripheral surface in the 2nd area | region H2 of the inner side press member 158 to the workpiece | work W is performed. That is, for example, when the step portion 158b is formed on the inner pressing member 158, the bent portion F2 is formed on the workpiece W.

Subsequently, as shown in FIG. 2D, following the second stage molding process, a third stage molding process in the third region H3 of the inner pressing member 158 is performed.
That is, as in the case of the second stage, while maintaining the rotation of the workpiece W, the inner and outer surfaces of the workpiece W are pressed by the outer pressing member 138 and the inner pressing member 158, and the processing point WP is the lower end of the third region H3. The elevating mechanism 134 and the outer arm 136 are driven so as to move from the upper end to the upper end.
Thereby, the shaping | molding process which transfers the shape of the outer peripheral surface in the 3rd area | region H3 of the inner side press member 158 to the workpiece | work W is performed.

Subsequently, as shown in FIG. 2E, the outer arm 136 of the outer pressing mechanism 130 and the inner arm 154 of the inner pressing mechanism 150 are driven to retract the outer pressing member 138 and the inner pressing member 158 from the workpiece W, Thereafter, the rotation of the workpiece W by the workpiece holding mechanism 120 is stopped.
Thereby, the shape which has the predetermined | prescribed outer diameter which contains the two bending parts F1 and F2 in the workpiece | work W is shape | molded. And the workpiece | work W after a shaping | molding process cut | disconnects the vicinity of the upper end and lower end in the circumferential direction as needed, and becomes a product.

The cylindrical member molding method and molding apparatus according to the first embodiment of the present invention includes the above-described configuration and operation, so that the outer pressing member 138 disposed outside the workpiece W and the inner pressing member 158 disposed inside are pressed. By controlling the pressure, it is possible not only to reduce the diameter of the workpiece W but also to perform a forming process for expanding the diameter.
In addition, since the inner pressing member 158 that presses the inner side of the workpiece W is only required to be disposed at a position facing the outer pressing member 138, the inner pressing member 158 is disposed inside the workpiece W required in the conventional spinning process. The support mechanism for the inner surface of the workpiece W can be reduced in size as compared with the child mold.
Further, by controlling the pressing force between the outer pressing member 138 and the inner pressing member 158, the flow of the metal material due to the plastic deformation of the workpiece W can also be controlled, so that the thickness of the workpiece W can be appropriately changed. .

FIG. 3 is a cross-sectional view of the main part showing a modification of the cylindrical member molding method and molding apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 3, the lifting mechanism 134 of the outer pressing mechanism 130 may further include a rotation mechanism that rotates around a predetermined rotation axis X <b> 1.

As a result, the moving axis on which the outer arm 136 advances and retreats can be freely set within the plane in which the elevating mechanism 134 moves up and down, so that a more complicated shape can be formed by arbitrarily changing the pressing direction to the workpiece W. It can correspond to processing.
Further, since the moving axis of the outer arm 136 can be set to be inclined with respect to the raising / lowering direction of the elevating mechanism 134, the reaction force from the work W applied to the outer pressing member 138, that is, the thrust applied to the rotation axis C1 of the outer pressing member 138. The load can be reduced, and as a result, the life of the outer pressing mechanism 130 can be extended.

<Example 2>
FIG. 4 is a top view schematically showing a molding apparatus that performs the method of molding a cylindrical member according to the second embodiment of the present invention.
Note that in the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 4, in addition to the base 110, the work holding mechanism 120, the side support mechanism 140, the inner pressing mechanism 150, and the control device shown in the first embodiment, the cylindrical member forming apparatus 200 according to the second embodiment includes: A first outer pressing mechanism 130 and a second outer pressing mechanism 230 are provided.
The second outer pressing mechanism 230 includes a main body 232, an elevating mechanism 234, an outer arm 236, and an outer pressing member 238, similarly to the outer pressing mechanism 130 shown in the first embodiment.
The main body 232, the lifting mechanism 234, the outer arm 236, and the outer pressing member 238 have the same structure and function as the main body 132, the lifting mechanism 134, the outer arm 136, and the outer pressing member 138 of the first outer pressing mechanism 130. It is what has.

The second outer pressing mechanism 230 is arranged at a position opposite to the first outer pressing mechanism 130 with the work holding mechanism 120 interposed therebetween.
Thereby, since the processing points with respect to the workpiece W are two at equal intervals, the processing efficiency can be improved.
In addition, by setting the processing points to be opposite to each other at two points, for example, even when a so-called springback (return due to internal stress) occurs due to plastic deformation caused by pressing at the first point, the second point is set. This can be corrected by pressing or further processed, and the processing accuracy can be improved.

<Example 3>
FIG. 5 is a top view schematically showing a molding apparatus that performs the method of molding a cylindrical member according to the third embodiment of the present invention.
In addition, in Example 3, about the thing which is the same structure as what was demonstrated in Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As illustrated in FIG. 5, the cylindrical member forming apparatus 300 according to the third embodiment includes the base 110, the work holding mechanism 120, the outer pressing mechanism 130, the side support mechanism 140, the inner pressing mechanism 150, and the control described in the first embodiment. In addition to the apparatus, a heating mechanism 360 for heating the workpiece W is provided.
The heating mechanism 360 includes a main body part 362 having a built-in configuration such as a heat source, and a heating part 364 attached to a side surface of the main body part 362.

Examples of the heating unit 364 applied to the heating mechanism 360 include a unit that radiates and heats a certain area of the surface of the workpiece W such as an infrared heater or an induction heating device.
Moreover, you may apply as the heating part 364 what can perform the local heat input of the surface of the workpiece | work W, such as a laser and an arc.

And the heating mechanism 360 is arrange | positioned in the position just before the outer side press mechanism 130 regarding the rotation direction of the workpiece | work W so that the heating part 364 may oppose the workpiece | work W. FIG.
As a result, it is possible to apply a pressing force to the processing point and plastically deform it while the workpiece W is heated. Therefore, it is possible to reduce the pressing force applied compared to processing at normal temperature or low temperature. Wear of the member 138, the side roller 148, and the inner pressing member 158 can be suppressed.
Further, instead of the heating mechanism 360 shown in FIG. 5, the forming apparatus 300 itself may be housed in a heating furnace (not shown) for processing.

As mentioned above, although the shaping | molding method and shaping | molding apparatus of the cylindrical member by this invention were demonstrated based on Example 1- Example 3, this invention is not limited to said Example, A various change can be given. .
For example, in the first to third embodiments, the case where the inner pressing mechanisms are arranged at four positions at equal intervals in the circumferential direction of the workpiece is illustrated, but at two or three positions as necessary. Even if it exists, the structure arrange | positioned in five or more places may be sufficient.

Moreover, although the case where one outer pressing member was provided in the outer pressing mechanism was illustrated, in order to improve the processing efficiency at the same position, in one outer pressing mechanism, for example, a plurality of outer pressing members are provided in the elevation direction. You may comprise as follows.
Furthermore, although the case where the cylindrical roller corresponding to the height which should process a workpiece | work was applied was illustrated as an inner side pressing member of an inner side pressing mechanism, an inner side pressing member is formed with the same flat roller as an outer side pressing member. A configuration may be adopted in which processing is performed by applying a local pressing force only at a processing point sandwiched between the two.

In addition, a measuring mechanism such as a sensor for measuring the outer diameter of the workpiece is added to the molding apparatus exemplified in the first to third embodiments, and data such as a dimensional change during processing is added to the outer pressing mechanism and the inner pressing mechanism. It may be configured to perform feedback control with respect to the pressing force.
Further, a lubricating mechanism for supplying oil, for example, may be added in the vicinity of the outer pressing member and the inner pressing member, particularly at the processing point, so as to reduce wear between the workpiece, the outer pressing member, and the inner pressing member. Good.
In addition, various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 100 Forming apparatus 110 Base 120 Work holding mechanism 122 Motor 122a Output shaft 124 Support plate 126 One end clamp member 126 Clamp claw 128 Other end clamp member 128 Clamp claw 130, 230 Outer pressing mechanism 134, 234 Elevating mechanism 136, 236 Outer arm 138, 238 Outer pressing member 140 Side support mechanism 144 Side support arm 146 Side roller support member 148 Side roller 150 Inner pressing mechanism 152 Shaft member 154 Inner arm 156 Inner support member 158 Inner pressing member 158a, 158b Step 360 Heating mechanism 364 Heating section W Work WP Machining point X Work rotation axis

Claims (6)

A base, a workpiece holding mechanism provided rotatably around a workpiece rotation axis perpendicular to the upper surface of the base, an outer pressing mechanism provided adjacent to the workpiece holding mechanism on the base, and the base A cylindrical member molding apparatus comprising: a side support mechanism provided at a position surrounding the workpiece holding mechanism; and an inner pressing mechanism provided in the vicinity of the workpiece rotation axis so as to face the outer pressing mechanism,
The workpiece holding mechanism includes a motor attached to the base, an end clamp member attached to an output shaft of the motor, and an other end clamp member disposed away from the one end clamp member. And
The outer pressing mechanism includes an outer pressing member that presses the outer surface of the workpiece held by the workpiece holding mechanism, an outer arm that attaches the outer pressing member to one end and moves forward and backward with respect to the workpiece rotation axis, and the outer An elevating mechanism that moves the arm in a direction approaching or separating from the base, and
The inner pressing mechanism includes a shaft member having the same axis as the workpiece rotation shaft, an inner pressing member that presses the inner surface of the workpiece, and an inner pressing member that is attached to one end to move forward and backward in the radial direction from the shaft member. And a cylindrical member forming apparatus. A plurality of the inner pressing mechanisms are provided at equal intervals in the circumferential direction around the shaft member,
The outer pressing mechanism is arranged to face one of the plurality of inner pressing mechanisms provided,
2. The molding of the cylindrical member according to claim 1 , wherein the side surface support mechanism is disposed to face a remaining one of the plurality of the inner pressing mechanisms that does not face the outer pressing mechanism. apparatus. The cylindrical member forming apparatus according to claim 2 , wherein a plurality of the outer pressing mechanisms are provided in a circumferential direction of the workpiece. The cylindrical member forming apparatus according to claim 2 or 3 , wherein each of the outer pressing member and the inner pressing member is a roller. The elevating mechanism of the outer pressing mechanism according to claim 1 to 4, further comprising a freely changeable pivoting mechanism moving shaft to advance and retreat the outer arm in a plane in which the lifting mechanism moves up and down The cylindrical member forming apparatus according to any one of the above. Molding apparatus of the cylindrical member according to any one of claims 1 to 5, further comprising a heating mechanism for heating the workpiece.

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