JP2012051003A - Counter cam device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in a counter cam device wherein a conventional thrust cam device has an adverse effect to expand a holder unit outwardly due to reaction force during processing.SOLUTION: This counter cam device 1 includes at least: a driver unit 5 pressed down by lowering of a moving die; an arcuate movement transmission member 2 transmitting downward movement of the driver unit 5; a vertically-sliding unit 6 having a rear end to which an end of the arcuate movement transmission member 2 is connected so as to be reciprocated to a predetermined direction and having a tip with a tool mounting face to which a tool is fixed; and a holder unit 3 guiding and supporting the arcuate movement transmission member 2 by a curved face sliding part in which a sliding curved face is formed.

Description

  The present invention relates to a die counter cam device for bending a work edge such as bending of a panel edge of an automobile or the like by negative angle forming.

  Conventionally, in processing such as bending of a workpiece, a push-up cam device is known as a mold device suitable for upper bending processing. As described in Patent Document 1 filed by the applicant, the driver unit 12 is moved up and down by the moving mold, and the horizontal slide unit is moved horizontally by the inclined cam surface of the driver unit 12. 13, a vertical slide unit 14 which is moved in the vertical direction by the horizontal movement of the horizontal slide unit 13 and has a mounting surface for the processing tool 14a, and an elastic means 15 for returning the horizontal slide unit 13 to its original position, A guide block 16 that transmits the urging force of the elastic means 15 to the horizontal slide unit 13 and guides the horizontal movement of the horizontal slide unit 13 and these cam mechanisms are accommodated in a bottomed rectangular cylindrical holder unit 17. Is known.

JP 2008-307546 A

  However, in the conventional push-up cam device, as shown in FIG. 9, the side walls 17 b and 17 c of the holder unit 17 have a horizontal pressing force when the driver unit 12 is pressed and a reaction force when the workpiece 18 is processed. It is pushed outward by force (thick arrow). If this is repeated, the life of the driver unit 12 will be adversely affected. Further, due to the side wall 17b of the holder unit 17 and the side walls extending perpendicular to the side wall 17b, the entire push-up cam device becomes large, which hinders downsizing of the entire mold.

Further, the push-up cam device is often used for bending as described above, and a frictional force is generated between the tool and the workpiece after the processing. When the vertical slide unit to which the tool is attached descends due to this frictional force, the vertical slide unit does not follow the movement of the press, the position is initially fixed by the frictional force, and then is a return means The return spring performs a return movement at a rapid speed. There has been a case where a large impact force generated when this sudden movement is stopped and the cam unit is damaged, and it has been a problem to effectively absorb and reduce the impact force.
The counter cam device according to the present invention has been proposed in order to solve such a problem.

The gist for solving the above-mentioned problems of the counter cam device according to the present invention and achieving the object is as follows:
A driver unit pushed down by the lowering of the moving mold,
An arc-shaped movement transmitting member for transmitting the downward movement of the driver unit;
An up-and-down slide unit having a tool mounting surface for connecting an end of the arc-shaped movement transmitting member to a rear end and reciprocating in a predetermined direction and fixing a tool to the tip;
It has at least a holder unit that guides and supports the arc-shaped movement transmitting member by a curved sliding portion formed with a sliding curved surface.

A return means for returning the vertical slide unit to its original position; and a stopper member for regulating a return position of the vertical slide unit;
The end of the driver unit and the end of the vertical slide unit are in sliding contact with each sliding surface of the end of the arc-shaped movement transmitting member, or the end of the driver unit and the end of the vertical slide unit The part is pin-coupled to the end of the arcuate movement transmission member;
The push-up direction of the vertical slide unit is a vertical direction or an oblique direction with an inclination angle;
The vertical slide unit has a part of the return means built in the back thereof;
Guide means for guiding the arc-shaped movement transmitting member so as not to deviate from the arc-shaped predetermined path is provided on a part of the members constituting the counter cam device;
The position of the end surface of the holder unit on the upper and lower slide unit side as viewed from the side is in a retracted position or surface compared to the position of the end surface on the workpiece side of the upper and lower slide unit or the tool fixed to the upper and lower slide unit. Being in one position;
A part of the holder unit is extended upward, and the vertical movement of the driver unit is guided and supported by a part of the extension part;
An impact force absorbing cushioning material that absorbs an impact force that is generated when the vertical slide unit is returned by the urging force of the return means is press-fitted or fixed in the buffer member hole of the stopper member or the holder unit, and In order to prevent damage due to deformation without reducing the volume of the material, chamfering by straight lines and curves at the entrance of the hole to be inserted or fixed;
Is included.

  According to the counter cam device of the present invention, the arc-shaped movement transmission member prevents the driver unit and the upper and lower slide units from spreading outward due to reaction forces during workpiece machining. As a result, the burden on the holder unit is reduced, the structure of the holder unit is simplified, the wall thickness and the like can be reduced, and the side walls around the upper and lower slide units are not required. Miniaturization can be achieved, and it can be installed in a small space accompanying the miniaturization of the entire mold.

In the conventional push-up cam device, the return means has an elastic means 15 attached to the lower part of the horizontal slide unit 13 as shown in FIG. 9 to increase the height of the push-up cam device as a whole. In the counter cam device of the present invention, as shown in FIG. 7, since the return means is built in the back of the vertical slide unit, the height dimension can be reduced, and the cylindrical shape opened only above the vertical slide unit. Since it is built in the housing portion 6f and can be attached and detached by a plate 6d fixed to the upper end surface portion of the holder unit 3 with bolts, disassembly and assembly are easy.
In addition, the stopper member and the cushioning material determine the return position of the upper and lower slide units and reduce the impact force when contacting.

  Since the end surface position on the workpiece side of the holder unit is in a retracted position or a flush position compared to the end surface position on the workpiece side of the vertical slide unit or the tool fixed to the vertical slide unit, the mold This eliminates overhang on the side and improves workability. Further, a part of the holder unit is extended upward, and the vertical movement of the driver unit is guided and supported by a part of the extended part, so that the number of parts is reduced and the counter cam is compact and the cost is reduced. It produces various excellent effects of becoming a device.

They are a schematic longitudinal cross-sectional view (A) explaining the general | schematic structure and use condition of the counter cam apparatus 1 based on this invention, and the partial cross section figure (B) which shows the Example of the guide means 9. FIG. It is sectional drawing of the counter cam apparatus 1 of the same invention. It is the perspective view (A), side view (B), front view (C) which shows an example of the attachments 10 and 11, and the perspective view (A), side view (B), and front view (C) of another example. It is the perspective view seen from diagonally upward of the counter cam apparatus 1. FIG. FIG. 2 is a perspective view of the counter cam device 1 as viewed obliquely from below. It is a perspective view which shows schematic structure of the counter cam apparatus 1a which concerns on the other Example of this invention. They are a front view (A) and a rear view (B) of the counter cam device 1a. It is the top view (A), schematic longitudinal cross-sectional view (B), and bottom view (C) of the counter cam apparatus 1a. It is sectional drawing (A)-(D) which shows the example of the press-fit or adhering of the shock absorbing buffer material 3e. It is a schematic longitudinal cross-sectional view explaining the schematic structure and use condition of the counter cam apparatus 20 which concerns on a prior art example.

  As shown in FIG. 1, the counter cam device 1 according to the present invention is configured so that the arc-shaped movement transmitting member 2 is slidably moved in a circular arc shape on the curved sliding portion 3 a of the holder unit 3. And the reaction force of the vertical slide unit are received at the lower part of the holder unit 3.

  As shown in FIG. 1, the counter cam device 1 of the present invention includes a driver unit 5 that is pushed down by lowering a moving mold (not shown), and an arc-shaped movement transmitting member that transmits downward movement of the driver unit 5. 2 and an up-and-down slide unit 6 having a tool mounting surface for connecting the end portion 2a of the arc-shaped movement transmission member 2 to the rear end portion 6a and reciprocating in a predetermined direction and fixing the tool 14a to the tip end portion 6b. And a holder unit 3 for guiding and supporting the arc-shaped movement transmitting member 2 by a curved sliding portion 3a having a sliding curved surface.

  The arc-shaped movement transmission member 2 replaces the conventional horizontal slide unit 13 and is an arc-shaped rigid sliding member having a required width. Both end portions 2 a and 2 b have a part of the functions of the vertical slide unit 14 and the driver unit 12.

  The lower surface 2c of the arc-shaped movement transmitting member 2 is in sliding contact with the curved sliding part 3a of the holder unit 3, and the curved sliding part 3a receives the pressure of the driver unit 5. Therefore, the horizontal component force acting on the side wall 3b of the holder unit 3 is reduced, and the deformation action is reduced.

  After the driver unit 5, the vertical slide unit 6 and the arc-shaped movement transmission member 2 complete the bending process of the end of the workpiece 18 by the lowering of the moving mold, the driver unit 5, the vertical slide unit 6 and the arc-shaped movement transmitting member 2 return to their original positions as the moving mold rises There is a need to.

  As shown in FIG. 2A, the return means incorporates a coil spring 6 e that receives a reaction force by a plate 6 d fixed to the upper end surface of the holder unit 3 with a bolt in the back part of the vertical slide unit 6. Further, when the tool is pulled away from the workpiece 18 after machining, if the vertical slide unit 6 is lowered against the frictional force generated between the tool and the workpiece 18, a large impact force is generated when contacting the positioning member. Therefore, a buffer material 3e for reducing the impact force is provided, and at the same time, a stopper member 3f for positioning the return position of the vertical slide unit 6 is provided.

  As a result, the vertical slide unit 6 and the tool 14a are returned by the urging force of the coil spring 6e as the moving mold rises. Then, the arc-shaped movement transmission member 2 is returned to the original position via the pin 8, and the driver unit 5 is also returned to the original position via the pin 7. The vertical slide unit 6 is returned to a predetermined position by the stopper member 3f, and a large impact force when the vertical slide unit 6 is lowered is also alleviated by the buffer material 3e.

  Further, as shown in FIG. 1, the end 5a of the driver unit 5 and the rear end 6a of the vertical slide unit 6 are connected to the ends 2a and 2b of the arc-shaped movement transmitting member via attachments 10 and 11, respectively. Pins 7 and 8 are pin-coupled. The attachments 10 and 11 are in sliding contact with the lower surface of the driver unit 5 and the lower surface of the upper and lower slide unit 6, respectively, and are movable in the horizontal direction. As shown in FIG. 2B, the attachments 10 and 11 can be formed so as to be movable, such as when the slidable contact surface on the upper surface is flat or in a mountain shape (V-shape). .

  Further, a guide means 9 is provided on a part of the member constituting the counter cam device 1 or on the holder unit 3 for guiding the arc-shaped movement transmitting member 2 so as not to deviate from a predetermined arc-shaped track. As this guide means 9, there is also a method of pressing the head of the bolt against the guide groove 2d as shown in FIG. As shown in FIGS. 1B and 1D, various guide means such as a side wall groove portion, a guide groove, a guide protrusion, and an arc-shaped groove are proposed.

  As shown in FIGS. 1 to 2-A, the position of the end surface 3d on the slide unit side of the holder unit 3 as viewed from the side is the end surface 6c of the upper and lower slide unit 6 or the tool 14a fixed to the upper and lower slide unit 6. Compared to the position of the end surface on the workpiece side, the workpiece is in a retracted position or in a flush position.

  The reason for this was that the arc-shaped movement transmission member 2 and the holder unit 3 were pushed up in a curved shape. Conventionally, as shown in FIG. 9, since the vertical slide unit 14 is linearly pressed by the horizontal slide unit 13 and pushed upward by the component force, the thick side wall 17 b that receives the lateral pressure in the holder unit 17 is provided. It was necessary. According to the present invention, since the thick side wall 17b is eliminated and the end surface 6c of the vertical slide unit 6 is retracted, the overhang on the mold side (the difference b between the end surfaces 19a and 19b in FIG. 9) is eliminated (in FIG. 1). The difference between the end faces 19a and 19c is a).

  As shown in FIGS. 1 to 2A, a part 3e of the holder unit 3 is extended upward, and the vertical movement of the driver unit 5 is guided and supported by a part of the extension part. Yes. This holder unit 3 makes it compact and eliminates the need for the up-and-down slide unit 14 as in the prior art, so that the overall size of the counter cam device 1 can be made compact.

  When such a counter cam device 1 is used, first, the moving mold of the mold is lowered from the state where the driver unit 5 is raised to the top dead center, and the driver unit 5 is pushed down. Thereby, the arc-shaped movement transmission member 2 is pushed down via the attachment 10 and the pin 7 and is rotated at an appropriate angle along the curved surface of the curved sliding portion 3a with which the lower surface 2c is in sliding contact.

  Due to the rotation of the arc-shaped movement transmission member 2, the vertical slide unit 6 also moves upward via the pin 8 and the attachment 11. The tool 14a ascends together with the vertical slide unit 6, and the end portion of the workpiece 18 is bent as shown in FIG.

  Thereafter, when the moving mold rises from the bottom dead center to the top dead center, the pushed-down state is released, and the vertical slide unit 6 is lowered by the return means (coil spring 6e) built in the vertical slide unit 6. At the same time, the arc-shaped movement transmission member 2 is pushed back in the reverse direction by the vertical slide unit 6 via the pin 8 and the attachment 11, and the driver unit 5 is also located at the top dead center via the pin 7 and the attachment 10. Return to the original position. Thus, the original state is restored.

  As shown in FIGS. 5 to 7, the counter cam device 1 a according to the second embodiment includes a movement transmission structure between the arc-shaped movement transmission member 2 and the driver unit 5, or the arc-shaped movement transmission member 2 and the vertical slide unit 6. In the attachment 11 and the end portion 2a of the movement transmission member 2, and the attachment 10 and the end portion 2b of the movement transmission member 2, the curved surface portion having an appropriate radius r is arcuate. It becomes a sliding surface and the movement transmission part is surface-joined. The structure is simpler than the pin connection, the number of parts is reduced, and the manufacturing cost can be reduced.

  Since the driver unit 5, the vertical slide unit 6 and the arc-shaped movement transmission member 2 are not connected directly or indirectly, in this case as well, after the end bending process of the workpiece 18 is completed, the moving mold rises. The return means for returning the vertical slide unit 6, the arc-shaped movement transmission member 2 and the driver unit 5 to their original positions is required.

  As shown in FIG. 7, the return means is provided with a coil spring 6 e that receives a reaction force by a plate 6 d fixed with bolts on the upper end surface of the holder unit 3, and this coil spring 6 e is provided on the back of the vertical slide unit 6. It is built in a cylindrical storage portion 6f that is opened only on the top. In addition, by providing return means in the vertical slide unit 6, the arc-type movement transmission member 2 is also returned to the original position by the movement transmission mechanism. The coil spring 6e is not limited to this, and a gas spring or the like may be used to generate an urging force.

  As shown in FIG. 7, the push-up direction of the vertical slide unit 6 is guided vertically in the first and second embodiments with the slide plate 6g sandwiching the neck of the back of the vertical slide unit 6 from both sides. Not limited to this, it can also be pushed up in an oblique direction with an inclination angle. The shock absorbing material 3e for absorbing the impact force at the bottom dead center of the upper and lower slide unit 6 is press-fitted into the hole for the buffer material of the holder unit 3, as shown in FIG. 5, FIG. 6 and FIGS. Or it is fixed. The buffer material 3e is an elastic body such as urethane, for example. Then, in order to prevent damage due to deformation without reducing the volume of the cushioning material, as shown in FIGS. 8A to 8C, chamfering by straight lines and curves is performed at the entrance of the hole to be inserted or fixed. Is preferred.

  In the counter cam devices 1 and 1a as described above, the vertical pressure and the horizontal force in the horizontal direction are received by the arc-shaped curved sliding portion 3a of the holder unit 3, so that the side pressure is reduced. A conventional cantilevered and thick-walled side wall becomes unnecessary.

  The counter cam devices 1 and 1a according to the present invention can be applied to various device devices such as various cam devices by making the load action due to the combination of linearly moving cams curved. .

1,1a counter cam device,
2 arc-shaped movement transmission member, 2a end,
2b end, 2c bottom surface,
2d guide groove,
3 Holder unit, 3a Curved surface sliding part,
3b side wall, 3c guide part,
3d end face, 3e cushioning material,
3f stopper member,
4 Driver guide,
5 Driver unit, 5a end,
6 Vertical slide unit, 6a Rear end,
6b tip, 6c end face,
6d plate, 6e coil spring,
6f storage section, 6g slide plate,
7,8 pins,
9 Guide means,
10,11 attachment,
12 Driver unit,
13 Horizontal slide unit,
14 vertical slide unit, 14a tool,
15 elastic means,
16 guide blocks,
17 Holder unit,
18 works,
19a, 19b, 19c end face,
20 A counter cam device according to a conventional example.

Claims (9)

A driver unit pushed down by the lowering of the moving mold,
An arc-shaped movement transmitting member for transmitting the downward movement of the driver unit;
An up-and-down slide unit having a tool mounting surface that has an end portion of the arc-shaped movement transmission member slidably contacted or connected to the rear end portion and reciprocated in a predetermined direction, and has a tool attached to the tip portion;
Comprising at least a holder unit that guides and supports the arc-shaped movement transmitting member by a curved sliding portion formed with a sliding curved surface;
A counter cam device. A return means for returning the vertical slide unit to its original position and a stopper member for regulating the return position of the vertical slide unit;
The counter cam device according to claim 1. The end of the driver unit and the end of the vertical slide unit are in sliding contact with each sliding surface of the end of the arc-shaped movement transmitting member, or the end of the driver unit and the end of the vertical slide unit Is pin-coupled to the end of the arc-shaped movement transmission member,
The counter cam device according to claim 1 or 2. The up / down slide unit should be pushed up vertically or diagonally with an inclination angle,
The counter cam device according to any one of claims 1 to 3. The vertical slide unit has a built-in part of the return means on its back,
The counter cam device according to claim 2. Guide means for guiding the arc-shaped movement transmitting member so as not to deviate from the arc-shaped predetermined trajectory is provided in a part of the members constituting the counter cam device,
The counter cam device according to claim 1, wherein The position of the end surface of the holder unit on the upper and lower slide unit side as viewed from the side is in a retracted position or flush with the position of the end surface on the workpiece side of the upper and lower slide unit or the tool fixed to the upper and lower slide unit. Being in the position of
A counter cam device according to any one of claims 1 to 6. A part of the holder unit is extended upward, and the vertical movement of the driver unit is guided and supported by a part of the extension part;
The counter cam device according to claim 1, wherein: An impact force absorbing cushioning material that absorbs an impact force that is generated when the vertical slide unit is returned by the urging force of the return means is press-fitted or fixed in the buffer member hole of the stopper member or the holder unit, and In order to prevent damage due to deformation without reducing the volume of the material, chamfering by straight lines and curves at the entrance of the hole to be inserted or fixed,
The counter cam device according to claim 2, wherein

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