JPH081242A - Press - Google Patents

Abstract

PURPOSE:To perform press forming with high precision by controlling the transfer of a rotary cam in the moving direction of a slide cam, at a stopping point after the rotation of the rotary cam, and thereby preventing deviation of the rotary cam against a mounting surface formed in a lower die. CONSTITUTION:The press is provided with a lower die 5 which is provided with a mounting surface and also a cam groove, an upper die 2 which is arranged facing oppositely to this lower die 5 and which is movable vertically in the lower die direction, and a rotary cam 8 which is arranged in the cam groove and rotatabie from a first stopping point to a second stopping point. The press is also provided with a slide cam 3 by which, while the upper die 2 is lowered, a rotary force is imparted to a rotary cam 8 rotating it from the second sopping point to the first stopping point and which is provided in the upper die in a suspended state so as to be slidable on the rotary cam at the point when the rotary cam is rotated reaching the first stopping point, and a control means 7 for controlling the transfer of the rotary cam 8 in the sliding direction of the slide cam 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device for bending a work held by a rotary cam. More specifically, the present invention relates to a press device for performing negative-angle forming, which is a shape in which a work enters the lower die from the descending locus of the upper die when the work is press-formed.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 63-11089 discloses a method of forming a negative angle on a panel-shaped work using a rotary cam. Hereinafter, this press machine will be described with reference to FIGS. 4 to 6.

FIG. 4 shows an overall sectional view of a conventional press machine. A cam groove 13 having an arcuate cross section is formed in the lower die 5 fixed to the floor surface. This cam groove 13
A rotary cam 8 is inserted into the cam groove 13 and is rotatably disposed in the cam groove 13. A bending portion 20 is formed on the rotary cam 8 and cooperates with a bending blade 21 of the slide cam 3 described later to form a negative angle on the work W. A mounting surface 14 on which the work W is mounted is formed on the upper surface of the lower die 5 in FIG. A ram 1 is arranged so as to face the lower die 5, and the ram 1 is arranged so as to be vertically movable in FIG. 4 by a drive source (not shown). Further, the upper die 2 arranged so as to project downward in FIG. The lower end of the upper mold 2 in FIG. 4 is formed in a tapered shape. A plate-shaped slide cam slide member 11 is arranged along the tapered surface, one surface of which is fixed to the tapered surface of the upper die 2 and the other surface of which allows a slide cam 3 described later to slide.

Further, a slide cam 3 is arranged on the slide cam slide member 11, and the slide cam 3 is slidable along the slide cam slide member 11. A bending blade 21 is formed on the left end of the slide cam 3 in FIG. 4, and the cooperation of the bending blade 21 and the bending portion 20 formed on the rotary cam 8 allows the work W on the mounting surface 14 to be attached to the work W. Perform press molding. The slide cam 3 is constantly urged downward in FIG. 4 by a spring (not shown). Further, the pad 10 is arranged at a portion facing the mounting surface 14. The pad 10 is supported by the ram 1 via a spring 60, and the work W is held between the pad 10 and the mounting surface 14 during press molding.

The piston 50 is slidably arranged in a piston hole 52 formed in the lower die 5, and one end of the piston 50 is connected to the rotary cam 8 via a lever 51. The piston 50 is constantly urged upward in FIG. 4 by a spring 53 press-fitted in a piston hole 52. Therefore, the rotary cam 8 connected to the piston 50 via the lever 51 is also biased in the arrow direction in FIG.

Next, the operation of the above press device will be described with reference to FIGS. 4 to 6. 4 shows the slide cam 3
FIG. 6B is a diagram showing a state immediately after abutting with the slide member 4 for a rotary cam, showing a state where the bending portion 20 of the rotary cam is stopped in a state of escaping from the work W and waiting at a second stop point. There is. FIG. 5 is a diagram in which the slide cam 3 is sliding on the rotary cam slide member 4, and the first stop in which the bending portion 20 of the rotary cam 8 is stopped in a state of being connected to the mounting surface 14. It shows the state of reaching the point. In FIG. 6, the slide cam 3 reaches the first stop point, and the bending blade 21 formed on the slide cam 3 and the bending portion 20 formed on the lower die 5 cooperate to perform negative angle forming on the work W. It shows the state of being.

First, as shown in FIG. 4, the work W is mounted on the mounting surface 14, and then a drive source (not shown) is driven to lower the ram 1 in FIG. The pad 10 is brought into contact with the work W on the mounting surface 14 as the ram 1 descends, so that the work W is positioned and fixed.
Further, the ram 1 is lowered while contracting the spring 60. As the ram 1 descends, the upper die 2 also descends, and the slide cam 3 is brought into contact with the rotary cam slide member 4 formed on the rotary cam 8. Further, when the ram 1 is lowered, the slide cam 3 presses the rotary cam slide member 4 downward in FIG. 4 and rotates the rotary cam 8 clockwise in FIG. Further rotation of the rotary cam 8 is restricted and stopped when the rotary cam slide member 4 contacts the contact surface 61 formed on the lower die 5. This state is shown in FIG.

Thereafter, the ram 1 is further lowered to press the rotary cam slide member 4, but the rotary cam slide member 4 does not move in the pressing direction due to the contact with the lower die 5, and is stopped. It will be as it is. Therefore, the slide cam 3 slides on the rotary cam slide member 4 in the direction of arrow A shown in FIG. Then, as the slide cam 3 moves in the direction of arrow A, the bending blade 21 formed on the slide cam 3 and the bending portion 20 formed on the lower die 5 come close to each other, and the state shown in FIG. 6 is obtained. Therefore,
The bending blade 21 formed on the slide cam 3 and the bending portion 20 formed on the lower die 5 cooperate with each other to perform negative angle forming on the work W.

After the negative angle forming is performed on the work W, the ram 1 is raised and the slide cam 3 is also raised accordingly.
Therefore, the rotating cam 8 is rotated in the direction of arrow B in FIG. 4 by the spring 53 arranged on the piston 50, and the bending portion 20 is separated from the mounting surface. Through the above steps 1
The pressing process is completed.

[0010]

However, since the above-mentioned pressing device has a structure in which the rotary cam 8 is rotated in the cam groove 13 formed in the lower die 5, as shown in FIG. A clearance d for allowing is required. Therefore, when the slide cam 3 slides on the rotary cam slide member 4, the frictional force of the slide cam 3 causes the rotary cam 8 to move.
Since a load is applied to the slide cam 3 through the slide member for the rotary cam, the rotary cam 8 is moved by the slide cam 3 by the clearance d.
7 in the sliding direction, and as shown in FIG. 8 which is an enlarged view of the portion I in FIG. 7, a deviation t occurs between the rotary cam 8 and the mounting surface 14 on the lower die 5. The work W on the mounting surface 14 is damaged by the step due to the deviation t when the load by the press molding is applied.

Therefore, according to the present invention, at the first stop point of the rotary cam, the restricting means restricts the movement of the rotary cam in the moving direction of the slide cam, whereby the mounting surface formed on the rotary cam and the lower die. The purpose is to prevent press misalignment and perform accurate press molding.

[0012]

Means for solving the above-mentioned problems of the present invention include a lower die having a placing surface for placing a work on an upper portion thereof and having a cam groove inside thereof. An upper die which is arranged so as to face the lower die and is capable of moving up and down in the lower die direction; and an upper die which is arranged in the cam groove and which stops in a state where the end portion is continuous with the placing surface to form the contour of the work. A rotary cam rotatable from a stop point of 1 to a second stop point at which the end is separated from the work placed over the end and the placement surface, and the upper mold Is applied to the rotary cam while lowering the rotary cam from the second stop point to the first stop point, and the rotary cam rotates to rotate the rotary cam. When it reaches the stop point of No. 1, it is suspended in the upper mold in a slidable state on the rotary cam. In the press device having a slide cam, the first stopping point, in which the rotating cam with a restricting means for restricting the movement of the sliding direction of the slide cam.

[0013]

With the cooperation of the lower die and the tip of the slide cam that descends with the lowering of the upper die while applying the rotational force from the first stop point to the second stop point to the rotary cam, the placement is performed. The work on the surface is pressed. At this time, the restricting means fixes the rotary cam to the cam groove to prevent the rotary cam from moving in the sliding direction of the slide cam.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. The same parts as those of the conventional technique are designated by the same reference numerals.

FIG. 1 is an overall sectional view of a pressing apparatus showing an embodiment according to the present invention. The rotation configuration of the rotary cam 8 and the fixing means for the work W are the same as those in the conventional art,
In this embodiment, the regulating means 7 is provided at the contact portion between the lower die 5 and the rotary cam slide member 4. This regulation means 7
As shown in FIG. 2, which is an enlarged view of FIG. 1, includes a convex portion 6 and a concave portion 12, and the convex portion 6 is a contact portion which is a contact portion with the rotary cam slide member 4 on the lower die 5. Formed on surface 61,
It projects upward in FIG. Further, the concave portion 12 is a hole formed in the rotary cam slide member 4 and having a diameter capable of fitting the convex portion 6 therein. Among these, in the convex portion 6, the convex member 30 having the bolt hole 31 is arranged on the tap 32 formed on the contact surface 61 on the lower die 5 as shown in FIG. It is formed by penetrating through and the bolt hole 31. The convex member 30 is formed so as to project upward from the contact surface 61 in FIG. 3 in a state of being assembled on the lower mold 5 by the bolt 33.

Since the convex portion 6 and the concave portion 12 are fitted together when the rotary cam slide member 4 and the lower die 5 are brought into contact with each other, the rotary cam slide member 4 does not move relatively on the lower die 5. Fixed as. Therefore, the rotary cam 8 formed integrally with the rotary cam slide member 4 is also fixed in the cam groove 13 when the slide cam 3 slides on the rotary cam slide member 4, and the rotary cam 8 is fixed. Is restricted from moving in the sliding direction of the slide cam 3.

Other press device configurations or operations are as follows.
It is similar to the prior art. It should be noted that the regulating means 7 is provided in the recess
The same effect can be obtained even when 2 is formed on the lower mold 5 and the convex portion 6 is formed on the rotary cam slide member 4. Further, a plurality of these regulating means 7 can be arranged on the lower die 5 and the rotary cam slide member 4.

The restricting means 7 for the rotary cam 8 in the above-mentioned pressing device forms a hole as the concave portion 12 on the rotary cam slide member 4 side, and forms a protruding portion as the convex portion 6 on the lower mold 5. Therefore, as compared with the conventional press machine, the processing accuracy can be improved with a simple structure.

[0019]

As an effect of the present invention, when the slide cam slides on the rotary cam slide member and a force for moving the rotary cam is applied to the rotary cam, the rotary cam slides by the restricting means. Since the movement of the cam in the sliding direction is restricted, the mounting surface does not shift due to the movement of the rotary cam, and the work on the mounting surface is scratched or deformed during press working. It is possible to prevent

[Brief description of drawings]

FIG. 1 is an overall sectional view showing a press device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a press device according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a press device according to an embodiment of the present invention.

FIG. 4 is an overall cross-sectional view showing a conventional pressing device.

FIG. 5 is an overall sectional view showing a conventional pressing device.

FIG. 6 is an overall sectional view showing a conventional pressing device.

FIG. 7 is a partial cross-sectional view showing a conventional pressing device.

FIG. 8 is a partial cross-sectional view showing a conventional pressing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ram 2 ... Upper mold 3 ... Slide cam 4 ... Rotating cam slide member 5 ... Lower mold 6 ... Convex part 7 ... Regulation means 8 ... Rotating cam 10 ... Pad 11 ... Slide cam slide member 12 ... Recessed part 13 ... Cam Groove 14 ... Placement surface 20 ... Bending portion 21 ... Bending blade 30 ... Convex member 31 ... Bolt hole 32 ... Tap 33 ... Bolt 50 ... Piston 51 ... Lever 52 ... Piston hole 53 ... Spring 60 ... Spring 61 ... Contact surface

Claims (1)

[Claims] 1. A lower die having a placing surface for placing a work thereon and having a cam groove inward, and a lower die, which is arranged so as to face the lower die and can be moved up and down in the direction of the lower die. The upper die and the first stop point which is disposed in the cam groove and stops in a state where the end portion is continuous with the mounting surface and forms the contour of the work, and extends from the end portion to the mounting surface. A rotating cam that is rotatable from a placed work to a second stop point where it stops with the end part being separated, and the rotating cam that descends as the upper die descends while the rotating cam moves to the second stop point. A rotational force that is rotated from a stop point to the first stop point is applied to the rotary cam,
And a slide cam hung on the upper mold in a slidable state on the rotary cam when the rotary cam rotates to reach the first stop point, A press device comprising: a restricting unit that restricts the rotation cam from moving in the slide direction of the slide cam at a stop point.