JPH10291030A - Press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize bending of a work having a part of a negative angle with one process by returning a guide cam without interfering with the work even in the case that the outer shape itself of the work has the negative angle of making unable to return the guide cam. SOLUTION: This is a press die of a type in which a work is bent by lowering a fixing cam 14, and moving a guide cam 10 and a working cam 12 to a working position, after working, the work generated with a negative angle on the bent part is taken out by raising the fixing cam 14 and moving the guide cam 10 and the working cam 12 to the respective original positions. In the case that the outer shape itself of the work bent part has the negative angle being made unable to return the guide cam 10, this negative angle part is bent with a rotary cam 16 installed on the guide cam 10 and an upper hanging cam 18 to rotate this rotary cam 16 to the working position, and the guide cam 10 is returned in the state of this rotary cam 16 being separated from the part of the negative angle part by separating the upper hanging cam 18 from the rotary cam 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double cam type press die capable of taking out a work having a negative angle in a bent portion.

[0002]

2. Description of the Related Art For example, Japanese Utility Model Laid-Open Publication No. Sho 61-82720 discloses a double cam type press die in which bending is performed by a processing cam provided on an upper die and a guide cam provided on a lower die. . Japanese Patent Application Laid-Open No. 4-258316 discloses a technique in which a slide die is approached to a rotary cam provided in a lower die in a press die to perform bending.

FIG. 7 is a configuration diagram showing a general double cam type press for bending. As shown in this drawing, the press die includes a guide cam 50, a processing cam 52, and a fixed cam 54. Then, as shown in FIG. 7A, by lowering the fixed cam 54, the guide cam 50 is moved in the direction of the arrow a, and at the same time, the work cam 52 is moved in the direction of the arrow b to bring the workpiece 30 closer to bend. After the completion of the bending, the fixed cam 54 is raised as shown in FIG. 7B, and the guide cam 50 and the processing cam 52 are returned to the original directions (the directions of the arrows c and d) by a spring force or the like.
At this time, since the guide cam 50 is returned in a direction to enter the inside of the work 30, even if a negative angle is generated in the bent portion 32 of the work 30, it can be taken out.

[0004]

However, as shown in FIG. 8, when the planar shape of the bent portion 32 of the workpiece 30 has a negative angle that makes the return of the guide cam 50 impossible, this negative angle portion 34 and the guide cam 50 interfere with each other. Therefore, it is impossible to move and bend such a negative angle portion 34 by the guide cam 50 and the processing cam 52 in one step.

An object of the invention described in claim 1 is to enable the guide cam to be returned without interfering with the work even if the external shape of the work itself has a negative angle that makes the return of the guide cam impossible. It is to realize bending of a work having such a negative angle portion in one step.

An object of the present invention is to slightly return the guide cam when the outer shape of the bent portion of the work is curved so as to bulge slightly outward in the return direction of the guide cam. It is possible to remove the guide cam from the bent portion of the work alone.

[0007]

According to the first aspect of the present invention,
The work is bent by moving the guide cam and the processing cam to the processing position by lowering the fixed cam, and after processing, the guide cam and the processing cam are moved to their original positions by the raising of the fixed cam to bend. In the case of a press die of a type that enables removal of a workpiece having a negative angle in a processing portion, and in the case where the external shape itself of the bending portion of the workpiece has a negative angle that makes the return of the guide cam impossible, This negative angle portion can be bent by a rotary cam provided on the guide cam and an upper hanging cam that rotates the rotary cam to the processing position. The upper hanging cam is separated from the rotary cam, and the rotary cam is moved by the negative angle. The guide cam is returned in a state away from the portion. Thereby, the guide cam can be returned without interfering with the negative angle portion of the work,
Bending of a workpiece having such a negative angle portion can be performed in one step.

According to a second aspect of the present invention, the guide cam and the processing cam are moved to a processing position by lowering the fixed cam to bend the work, and after the processing, the guide cam and the processing cam are raised by raising the fixed cam. Are moved to their original positions to allow the removal of a workpiece having a negative angle in the bending portion, and the outer shape of the bending portion of the workpiece is in the return direction of the guide cam. In the case of a curved shape that bulges slightly outward along,
The curved portion can be bent by a rotary cam provided on the guide cam and an upper suspension cam for rotating the rotary cam to a processing position, and the upper suspension cam is separated from the rotary cam and the rotary cam is separated from the curved portion. The guide cam is set to be returned in a state where the guide cam is returned.

As described above, even if the bent portion of the work has such a curved portion as described above, the guide cam is detached from the bent portion of the work simply by slightly returning the guide cam, and the work can be taken out. Reducing the return stroke of the guide cam to a small value is advantageous when, for example, a die for punching is installed near the return position of the guide cam. Because, in the conventional technique, when the bending portion of the work has such a curved portion, the return stroke of the guide cam becomes large, and in order to avoid the interference between the guide cam and the die while securing this stroke. It is necessary to reduce the thickness of the guide cam, but the present invention does not affect the thickness (strength) of the guide cam at all.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a press die for crimping bending according to the present embodiment. The press die shown in this drawing is also basically a double cam type, and includes a guide cam 10 movably mounted on a lower die (not shown) side and a guide cam 1.
0, and a fixed cam 14 fixed to an upper die (not shown). When the fixed cam 14 descends, the guide cam 10 and the processing cam 1 are moved.
2 moves in the same manner as in the case of FIG. In the present embodiment, the guide cam 1
A rotary cam 16 is provided in a part of the cam 0, and an upper suspension cam 18 corresponding to the rotary cam 16 is assembled to the upper die.

FIG. 2 is a plan view showing a part of the work 30 which is shifted and bent by a press die. As shown in this drawing, the bent portion 32 of the work 30 has a portion 34 at the negative angle with respect to the return direction (the direction of the arrow c) of the guide cam 10 in its planar shape itself. Since the bending cam cannot be performed on the negative angle portion 34 with the processing cam 12, the guide cam 10 corresponding to the negative angle portion 34
Is provided with the rotary cam 16. The upper suspension cam 18 approaches the rotary cam 16 in the direction of the arrow e, and the bending of the portion 34 having the negative angle is performed.

A description will now be given of the approach bending by the press die. As described above, the guide cam 10 is moved to the processing position by the lowering of the fixed cam 14. While maintaining this state, the upper suspension cam 18 comes into contact with the rotary cam 16 as shown in FIG. Further, as shown in FIG.
8 moves to rotate the rotary cam 16 to the processing position, and performs the bending work of the work 30.

Thereafter, when the upper suspension cam 18 rises and separates from the rotary cam 16, as shown in FIG. 3C, the rotary cam 16 rotates in the original direction due to a spring force or the like. Thereby, as shown in FIG.
Is separated from the rotary cam 16. Subsequently, when the fixed cam 14 is lifted away from the guide cam 10, the guide cam 10 is moved together with the rotary cam 16 as shown in FIG.
4, the work 30 can be taken out. As a result, the work 3 having the negative angle portion 34
Zero approach bending can be performed in one step.

FIG. 5 is a plan view showing a part of the work 30. As shown in this drawing, the outer shape of the bent portion 32 of the work 30 has a curved portion 36 which slightly bulges outward along the return direction of the guide cam 10.
In this case, the guide cam 10 is returned in the
5A, the return stroke S1 of the guide cam 10 becomes large in a general press die shown in FIG. 5A.

Therefore, as shown in FIG. 5B, the rotary cam 16 having the curved portion 36 provided on the guide cam 10,
The rotary cam 16 is bent by an upper suspension cam (not shown) that rotates to a processing position, and after the processing, the rotary cam 16 is rotated in the original direction as described above and separated from the curved portion 36 in the state described above. The guide cam 10 is returned. As a result, the return stroke S2 of the guide cam 10 is significantly reduced as compared with the case shown in FIG.

As shown in FIG. 6, a punching die 2 fixed to the lower die 20 near the return position of the guide cam 10.
5A, in order to avoid the interference between the guide cam 10 and the die 22 while securing the large return stroke S1 in the case shown in FIG. It is necessary to reduce the thickness M1 as shown by the solid line in FIG. On the other hand, in the case shown in FIG. 5B, the return stroke S2 of the guide cam 10 can be small, so that the thickness M2 of the guide cam 10 is sufficiently set as shown by the imaginary line in FIG. It is possible to avoid interference between the use die 22 and the guide cam 10.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a press die for bending.

FIG. 2 is a plan view showing a planar shape of a bent portion of a work together with a mold member.

FIG. 3 is an explanatory view showing a bending operation by a rotary cam and an upper suspension cam.

FIG. 4 is a configuration diagram showing a relationship between a rotary cam and a workpiece after processing is completed.

FIG. 5 is a plan view showing a part of a work.

FIG. 6 is an explanatory diagram showing a relationship between a return stroke of a guide cam and a thickness thereof.

FIG. 7 is a configuration diagram showing a general double-cam type bending press.

FIG. 8 is a plan view illustrating a planar shape of a bent portion of a work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Guide cam 12 Working cam 14 Fixed cam 16 Rotary cam 18 Suspended cam 30 Work 32 Bending part 34 Negative angle part 36 Curved part

Claims (2)

[Claims] 1. A guide cam and a processing cam are moved to a processing position by lowering a fixed cam to bend a workpiece, and after the processing, the guide cam and the processing cam are respectively returned to their original positions by raising the fixed cam. The press die is of a type in which a workpiece having a negative angle at the bending portion can be taken out by moving the guide cam to the outer shape itself of the bending portion of the workpiece. In this case, the negative angle portion can be bent by a rotary cam provided on the guide cam and an upper suspension cam that rotates the rotary cam to a processing position. A press die, wherein the guide cam is returned in a state where the cam is separated from the negative angle portion. 2. A guide cam and a processing cam are moved to a processing position by lowering a fixed cam to bend a work, and after the processing, the guide cam and the processing cam are respectively returned to their original positions by raising the fixed cam. The press die is of a type in which a workpiece having a negative angle at the bending portion can be taken out by moving the workpiece to the outside, and the outer shape of the bending portion of the workpiece is slightly outward along the return direction of the guide cam. In the case of a curved shape so as to swell, the curved portion can be bent by a rotary cam provided on a guide cam and an upper suspension cam that rotates the rotary cam to a processing position, and the upper suspension cam is moved from the rotary cam. A press die, wherein the rotary cam is set so as to return the guide cam in a state where the rotary cam is separated from the curved portion.