JP2010247199A - Method and device for partial thickness increasing of press-made workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase thickness of at least a part of a bent part of a press-made workpiece while suppressing wrinkles. <P>SOLUTION: A press-made workpiece W is prepared, which comprises an end wall 1, a bent part 2 which is bent to one side from an outer periphery of the end wall 1, and a cylindrical part 3 continuous to the bent part 2. When increasing thickness of at least a part of the bent part 2 of the workpiece W, the workpiece W is clamped by a clamp punch 10 to be adapted to an inner surface of the workpiece W, a clamp die 24 to be adapted to an outer surface of the end wall 1, and a thickness increase guide die 29 which is fitted to its outer periphery in an axially slidable manner, and adapted to the outer peripheral surfaces of the bent part 2 and the cylindrical part 3. A thickness-increasing punch 13 is inserted in a space 15 formed between the clamp punch 10 and the thickness increase guide die 29. The bent part 2 is thickness-increased by applying the compression load in the axial direction to the cylindrical part 3, and the thickness increase guide die 29 is retracted from the clamp die 24 according to the thickness increase. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides at least a part of the bent portion of a press-made workpiece comprising an end wall, a bent portion bent to one side from the outer periphery of the end wall, and a cylindrical portion provided continuously to the bent portion. The present invention relates to a method for increasing the thickness and improvement of the apparatus for increasing the thickness.

  Such a method for partially increasing the thickness of a pressed workpiece is already known as disclosed in Patent Document 1, for example.

Japanese Patent No. 3594445

  In the partial thickening method of the press-made workpiece disclosed in Patent Document 1, an end wall, a bent portion bent to one side from the outer periphery of the end wall, and a cylindrical portion connected to the bent portion are provided. In increasing the thickness of the outer peripheral portion of the end wall of the press-made workpiece, a punch adapted to the inner surface of the workpiece, an inner die adapted to the outer surface of the end wall, and an inner die integrally coupled The workpiece is clamped with an outer die adapted to the outer peripheral surface of the bent portion and the cylindrical portion, and the punch is formed with an annular recess facing the outer peripheral portion of the end wall. By applying an axial compressive load to the cylindrical portion, a part of the cylindrical portion is filled in the concave portion to increase the outer peripheral portion of the end wall.

  However, in the conventional method described above, when an axial compression load is applied to the cylindrical part of the workpiece by the thickening punch, when a part of the bent part of the work is filled into the concave part on the outer periphery of the punch, the material filled in the concave part Since there is nothing that regulates the flow of material, buckling due to buckling occurs in the parts that are thickened by the filling, which may impair the quality of the product.

  The present invention has been made in view of such circumstances, and at least a part of the bent portion of the press-made workpiece can be increased in thickness while suppressing the occurrence of wrinkles, thereby stably supplying a high-quality product. It is an object of the present invention to provide a method for partially thickening a press-made workpiece and an apparatus for thickening the same.

  In order to achieve the above object, the present invention provides a press-made workpiece comprising an end wall, a bent portion bent to one side from the outer periphery of the end wall, and a cylindrical portion connected to the bent portion. Prepare and increase the thickness of at least a part of the bent part of the workpiece, a clamp punch adapted to the inner surface of the workpiece, a clamp die adapted to the outer surface of the end wall, and an axial direction on the outer periphery of the clamp die The workpiece is clamped with a thickening guide die that fits slidably and fits to the outer peripheral surface of the bent portion and the cylindrical portion, and is formed between the clamp punch and the thickening guide die at the tip side of the cylindrical portion. A thickening punch is inserted into the space to be added, an axial compressive load is applied to the cylindrical portion to increase the thickness of the bent portion, and the thickening guide die is retracted with respect to the clamp die in accordance with the increased thickness. One feature.

  The present invention also relates to a thickening apparatus for carrying out the partial thickening method for a pressed workpiece of the first feature, wherein the first die cushion is placed on one of a bolster and a ram that are arranged so as to be close to and away from each other. A clamp punch that is supported via the inner surface of the workpiece, a clamp die that is supported by the other of the bolster and the ram and conforms to the outer surface of the end wall, and a second die cushion is interposed between the other of the bolster and the ram A thickening guide die fitted to the outer periphery of the clamp die so as to be slidable in the axial direction and fixed to one of the bolster and the ram, A thickening punch that is inserted into a space formed between the clamp punch and the thickening guide die on the tip side of the cylindrical portion and can come into contact with the end surface of the cylindrical portion. After clamping the workpiece with the punch punch, the clamp die, and the thickening guide die, the thickening guide clamp punch is pushed toward the cylindrical portion along with the compression deformation of the first die cushion to increase the thickness of the bent portion. The second feature is that the thickening guide die is retracted against the resilience of the second die cushion along with the increase in thickness.

  According to the first feature of the present invention, in a state where the entire workpiece is clamped by the clamp punch, the clamp die, and the thickening die, an axial compressive load is applied to the cylindrical portion of the workpiece by the thickening punch to bend the workpiece. The thickening guide die is retracted with respect to the clamp die in response to the increase in thickness, so that during the thickening of the bent portion, the flow of the thickening flows on the inner peripheral surface of the thickening guide die. You will be guided and you will be able to prevent wrinkles.

  According to the second feature of the present invention, the thickening punch pushes up the cylindrical portion of the workpiece and applies a compressive load so that the compressive force is concentrated on the bent portion of the workpiece, and a part of the cylindrical portion is bent at the bent portion. The thickness of the bent portion is increased and the increased pressure acts on the inner peripheral surface of the increased thickness guide die, so that the increased thickness guide die resists the resilience of the second die die cushion. To retreat. Therefore, during the increase in the thickness of the bent portion, the repulsive force of the second die die cushion always acts on the portion where the thickness of the bent portion increases from the increased thickness guide die. It will be guided to the inner surface and can prevent wrinkles without buckling.

The longitudinal cross-sectional view of the workpiece | work before thickness increase. The longitudinal cross-sectional view which shows the state which thickened the taper part of the bending part of the said workpiece | work by the method and apparatus of this invention. The state at the time of the attachment of a workpiece | work is shown with the vertical side view of the thickness increase apparatus of this invention. FIG. 4 is a view corresponding to FIG. 3 showing a clamped state of the workpiece. 5 is an enlarged view of 5 in FIG. FIG. 6 is a view corresponding to FIG. 5 showing a state at the start of partial thickening of the workpiece. FIG. 7 is a view corresponding to FIG. 6, showing a state of completion of partial thickening of the workpiece.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  First, drawing work is applied to a metal flat plate to form a workpiece W as shown in FIG. The workpiece W has a bowl-like shape composed of an end wall 1, a bent portion 2 bent to one side from the outer periphery of the end wall 1, and a cylindrical portion 3 connected to the bent portion 2. Further, the bent portion 2 is composed of a curved portion 2 a that continues to the end wall 1 side, and a tapered portion 2 b that connects the curved portion 2 a to the cylindrical portion 3.

  In the embodiment of the present invention, the bent portion 2 of the workpiece W, in particular, the tapered portion 2b is subjected to a thickening as shown in FIG. 2, and the thickening device 5 will be described with reference to FIGS. This will be described below.

  In FIG. 3, a ram 7 that is driven up and down by a power source (not shown) is disposed above the bolster 6 of the press machine. A lower base 8 and a lower die holder 9 are sequentially stacked and fixed on the upper surface of the bolster 6, and a plurality of first spool retainers 11 (only one is shown in the figure) are clamp punches 10 on the lower die holder 9. And the clamp punch 10 is urged upward by the elastic force of the first die cushion 12. The clamp punch 10 has a shape that fits the entire inner surface of the workpiece W, and the workpiece W is fitted and set therein.

  Further, a thickening punch 13 that is fitted to the outer periphery of the clamp punch 10 so as to be relatively slidable is fixed to the lower die holder 9 by a bolt 14, and an upper end portion of the thickening punch 13 is lowered by a lowering guide die 29. At this time, it is fitted into an annular space 15 (see FIG. 5) formed between it and the clamp punch 10 so as to face the lower end surface of the cylindrical portion 3 of the workpiece W.

  On the other hand, an upper base 20 and a slider 21 are sequentially stacked and fixed on the lower surface of the ram 7, and the slider 21 is a plurality of guide posts 22 standing from the lower base 8 (only one is shown in the figure). It is supported so that it can be raised and lowered. A first upper die holder 23 is fixedly connected to the slider 21, and a clamp die 24 is fixed to the first upper die holder 23 with a bolt 25. The clamp die 24 has a lower surface that matches the end wall 1 of the workpiece W and the outer surface of the curved portion 2a.

  Further, a second upper die holder 26 surrounding the first upper die holder 23 is connected to the slider 21 via a plurality of second spool retainers 27 (only one is shown in the figure) so as to be movable up and down by a predetermined distance. The second upper die holder 26 is biased downward by the elastic force of the second die cushion 28. A thickening guide die 29 is fixed to the second upper die holder 26 with bolts 30. The thickening guide die 29 has an inner peripheral surface that matches the outer peripheral surface of the tapered portion 2 b and the cylindrical portion 3 of the workpiece W.

Next, the operation of the first embodiment will be described.
[Attachment of Work W] See FIG. 3 First, as the ram 7 rises, the clamp die 24 and the thickening guide die 29 are raised together with the slider 21, and the work W shown in FIG. At this time, the clamp punch 10 is pushed up to a predetermined rising position regulated by the second spool retainer 27 by the elastic force of the first die cushion 12, and a predetermined gap S1 is formed between the clamp punch 10 and the lower die holder 9. Yes.
[Workpiece clamping start] See FIG. 3 Next, when the ram 7 is lowered, the clamp die 24 and the thickening guide die 29 are lowered together with the slider 21, and the clamp die 24 is bent from the end wall 1 of the workpiece W. The thickening guide die 29 is fitted to the outer peripheral surface of the tapered portion 2b of the workpiece W and the cylindrical portion 3 at the same time and pressed against the outer surface of the portion 2a. The work W is clamped over the entire inner and outer surfaces in cooperation with 10.
[Strengthening work clamp] See FIGS. 4 and 5. Further, when the ram 7 descends, the descending force is transmitted from the clamp die 24 and the thickening guide die 29 to the clamp punch 10 via the work W, Therefore, the clamp punch 10 descends while compressing the first die cushion 12, and the repulsive force of the first die cushion 12 reinforces the clamping force against the workpiece W. During this time, the upper end portion of the thickening punch 13 is fitted into an annular space 15 formed between the outer peripheral surface of the clamp punch 10 and the inner peripheral surface of the thickening guide die 29, and the cylindrical portion of the workpiece W 3 Opposes the lower end surface.
[Start of thickening] Refer to FIG. 6 Further, as the ram 7 descends, the clamp die 24 and the thickening guide die 29, the workpiece W and the clamp punch 10 as a whole further compress and lower the first die cushion 12, and the lower die holder The upper end of the stationary thickening punch 13 fixed to 9 abuts against the lower end surface of the cylindrical portion 3 of the workpiece W. At this stage, the thickening guide die 29 is urged to the lowered position regulated by the second spool retainer 27 by the elastic force of the second die cushion 28, and a predetermined gap S2 is formed between the lower surface of the slider 21. Is forming. On the other hand, a gap S <b> 1 ′ that allows the clamp punch 10 to be further lowered remains between the clamp punch 10 and the lower die holder 9.
[Increase in thickness] See FIG. 7. Further, as the ram 7 descends, the clamp die 24, the increase guide die 29, the workpiece W and the clamp punch 10 as a whole further compress and lower the first die cushion 12, and accordingly The thickening punch 13 relatively pushes up the cylindrical portion 3 of the workpiece W and applies a compressive load. At this time, the expansion of the cylindrical portion 3 of the workpiece W is restricted by the cylindrical surface of the inner peripheral surface of the thickening guide die 29. As a result, the compressive force is concentrated on the tapered portion 2b of the workpiece W, and The thickness of the portion shifts to the tapered portion 2b, and the tapered portion 2b is increased in thickness, and the increased pressure acts on the tapered surface of the inner peripheral surface of the increased thickness guide die 29, whereby the increased thickness guide die. 29 is retracted against the resilience of the second die cushion 28.

Therefore, during the increase in the thickness of the tapered portion 2b, the repulsive force of the second die cushion 28 always acts on the portion where the tapered portion 2b is increased from the increased thickness guide die 29. Therefore, the flow of the increased thickness is increased. It will be guided to the inner peripheral surface of the meat guide die 29, and the occurrence of wrinkles can be prevented without causing buckling.
[End of Thickening] See FIG. 7 In the illustrated example, the thickening of the taper portion 2b ends when the clamp punch 10 comes into contact with the upper surface of the lower die holder 9 and cannot be lowered any further. The upper die holder 26 comes into contact with the slider 21 and the thickening guide die 29 cannot be further retracted, so that the thickening can be terminated.
[Removal of workpiece W after thickening] Refer to FIG. 3 After the thickening is completed, the ram 7 is raised to the original position, and the clamp die 24 and the thickening guide die 29 are moved away from the clamp punch 10 and the clamp punch 10 or the thickening is increased. The workpiece W adhered to the meat guide die 29 is taken out. At this time, a known knockout mechanism that positively peels the workpiece W from the clamp punch 10 or the thickening guide die 29 is used as necessary.

  Thus, it is possible to obtain a high-quality product having the tapered portion 2b which is thickened without causing wrinkles as shown in FIG.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the first and second die cushions 12 and 28 can be of any type, such as a gas type, a spring type, a hydraulic type, and a pneumatic type. Further, the clamp punch 10 and the thickening punch 13 can be attached to the ram 7 side, and the clamp die 24 and the thickening guide die 29 can be attached to the bolster 6 side. Further, in the workpiece W after the thickness increase, further processing can be applied to each part such as the end wall 1, the bent part 2 and the cylindrical part 3 as necessary.

W ··· Work 1 ··· End wall 2 ··· Bending portion 2a ··· Curved portion 2b · · · Tapered portion 3 ··· Cylindrical 6 ··· Bolster 7 ··· Ram 10 · · · Clamp punch 12 · · · First die cushion 13 · · · Thickening punch 15 · · · Space 24 ... Clamp die 28 ... 2nd 1st die cushion 29 ... Thickening guide die

Claims (2)

Made of press comprising an end wall (1), a bent portion (2) bent to one side from the outer periphery of the end wall (1), and a cylindrical portion (3) connected to the bent portion (2) In order to increase the thickness of at least a part of the bent portion (2) of the workpiece (W),
A clamp punch (10) adapted to the inner surface of the workpiece (W), a clamp die (24) adapted to the outer surface of the end wall (1), and axially slidable on the outer periphery of the clamp die (24) The workpiece (W) is clamped with a thickening guide die (29) that fits and fits to the outer peripheral surface of the bent portion (2) and the cylindrical portion (3), and at the tip side of the cylindrical portion (3) The bent portion is formed by inserting a thickening punch (13) into a space (15) formed between the clamp punch (10) and the thickening guide die (29) and applying an axial compressive load to the cylindrical portion (3). (2) A method for partially thickening a workpiece made of a press, wherein the thickness-increasing guide die (29) is moved backward with respect to the clamp die (24) in accordance with the increased thickness. A thickening device for carrying out the partial thickening method for a pressed workpiece according to claim 1,
A clamp punch (10) which is supported by one of a bolster (6) and a ram (7) which are arranged so as to be close to each other and can be separated from each other via a first die cushion (12) and fits the inner surface of the workpiece (W). ), A clamp die (24) supported on the other of the bolster (6) and the ram (7) and adapted to the outer surface of the end wall (1), and a second on the other of the bolster (6) and the ram (7). Increased thickness supported by a die cushion (28) and fitted to the outer periphery of the clamp die (24) so as to be slidable in the axial direction and adapted to the outer peripheral surfaces of the bent portion (2) and the cylindrical portion (3). The guide die (29) is fixedly supported by one of the bolster (6) and the ram (7), and between the clamp punch (10) and the thickening guide die (29) on the tip side of the cylindrical portion (3). Inserted into the space (15) to be formed, And a multiplication may contact meat punch (13) to the surface,
After the workpiece (W) is clamped by the clamp punch (10), the clamp die (24) and the thickening guide die (29) by the close proximity of the bolster (6) and the ram (7), the first die die cushion ( 12) A thickening punch (13) is pushed into the cylindrical portion (3) along with the compressive deformation to increase the thickness of the bent portion (2). ) Is made to recede against the elastic force of the second die cushion (28).

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