JPH0415373Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a back-up device for a guide cam in a press die for bending the edge of a panel.

<Prior art> As shown in FIG. 3, a press die for bending the edge of a panel (hereinafter referred to as work W) has a guide cam 2 movable in the horizontal direction on a lower die 1, and this guide cam 2. A driver 5 is provided on an upper die 4 that moves up and down, and includes a processing cam 3 that is relatively movable above.
The guide cam 2 and the processing cam 3 are moved relative to each other by the wedge engagement, and the curved blade 6 provided on the guide cam 2 and the curved blade 7 provided on the processing cam 3 are brought close to each other, thereby cutting the edge of the workpiece W. It has a structure for bending.

<Problem to be solved by the invention> In the above press die, the curved blade load F due to the wedge engagement of the driver 5 is received only by the casting of the back surface 2a to which the curved blade 6 of the guide cam 2 is attached. . Therefore, if the wall thickness B1 of this back surface portion 2a is small, cracks C will occur and damage will occur. If the wall thickness B1 of the back surface 2a is increased in order to prevent this, the thickness of the receiving surface 1a of the workpiece W of the lower die 1 must be reduced, resulting in poor stability of the workpiece W and product accuracy. This is a problem that causes variations in the values.

<Means for solving the problems> The present invention provides a backup device to solve the above problems, and its characteristic configuration is that the backup device is installed movably in the horizontal direction on the lower mold. Consisting of a guide cam and a processing cam that is relatively movably installed on the guide cam, the guide cam and processing cam are moved relative to each other by the wedge engagement of a driver provided on the upper die that moves up and down, and the guide is In a press die that bends the edge of a workpiece by bringing curved blades provided on opposing surfaces of a cam and a processing cam close to each other, a shaft is attached to the end surface of the processing cam on the side where the curved blade is provided. A back-up receiving block is fixedly installed through the guide cam in the direction of the axis of movement of the guide cam, and a back-up receiving block is provided on the lower part of the part opposite to the back surface of the part provided with the curved blade of the guide cam. and a back-up propeller which intervenes between the back surface of the curved blade portion of the guide cam and the back-up receiving block at the bottom dead center of the press and pivots to a retracted position at the top dead center. It was established.

<Operation> With the above configuration, the back-up roller is moved from the retracted position by the movement of the guide cam that moves with the wedge of the driver due to the downward movement of the upper mold, and the back of the part with the curved blade of the guide cam and the back-up receiver. Intervening with the block and forcibly backing it up,
The curved blade load is received by the lower mold body.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. In FIG. 1, 1 is a lower mold, 2 is a guide cam, 3 is a processing cam, 4 is an upper mold, 5 is a driver, and 6 and 7 are curved blades, which are the same as the conventional structure.

The present invention provides a press mold having the above structure, in which the end surface 3a of the processing cam 3 on the side where the curved blade 7 is provided.
A shaft 10 is fixedly installed by penetrating a hole 11 made in the guide cam 2 in the direction of the moving axis of the processing cam 3, and a lower die of the part of the guide cam 2 facing the back surface 2a provided with the curved blade 6. 1 has a backup receiving block 13, and the rotating shaft 14 supported by this backup receiving block 13 is used as a fulcrum, and the shaft 1
0, and is provided with an operating arm 12 that rotates as the shaft 10 advances and retreats, and the rotating shaft 1
The present invention is characterized in that it is equipped with a guide cam backup device having a configuration in which a backup roller 16 interposed between the back surface portion 2a and the backup receiving block 13 is attached to a rotating arm 15 fixed to the back surface portion 2a.

Next, the operation of the backup device having the above configuration will be explained. FIG. 1 shows the state at the bottom dead center of the press, and at the top dead center of the press, the guide cam 2 is located at the rightward end in FIG. 1, and the processing cam 3 is located at the leftward end. At the leftward advancing end of this machining cam 3, the shaft 1
0 also moves to the left, that is, moves backward, and the actuating arm 12
Rotate clockwise. As a result, the pivot arm 15 also pivots clockwise via the rotating shaft 14, and the backup propeller 16 is pivoted to the retracted position shown by the imaginary line.

When the driver 5 wedges the cam surfaces of the guide cam 2 and the processing cam 3 due to the downward movement of the upper mold 4, the guide cam 2 moves to the left in FIG. 1, and the processing cam 3 moves to the right. The shaft 10 moves forward with the processing cam 3 moving to the right, and the operating arm 12 and the swing arm 15 swing counterclockwise around the rotating shaft 14 to move the backup roller 16 from the retracted position to the back surface 2a and the backup receiving block 13. It rotates in between. At the bottom dead center of the press, as shown in FIG. It is transmitted to the mold 1 and received by the main body of the lower mold 1.

<Effects of the invention> As described above, according to the invention, the back-up roller is rotated using the left-right movement of the processing cam, and the back surface 2a of the guide cam is forcibly backed up to reduce the curved blade load F. Since the structure is such that it is received by the lower mold body, even if the thickness of the back surface portion 2a of the guide cam is made thin, it will not be damaged, and this back surface portion 2a
By reducing the wall thickness of the guide cam, the size of the guide cam can be reduced, reducing costs and weight. Further, by reducing the thickness of the back surface portion 2a, the area of the workpiece receiving surface 1a of the lower die can be secured, which has the effect of improving processing accuracy and quality due to the stability of the workpiece.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a press die equipped with the present invention, FIG. 2 is a perspective view of the present invention, and FIG. 3 is a sectional view of a conventional press die. 1...Lower die, 2...Guide cam, 3...Processing cam, 4...Upper die, 5...Driver, 6, 7...
Curved blade, 10...shaft, 12...operating arm,
13... Backup receiving block, 16... Backup propeller.

Claims (1)

[Scope of utility model registration request] It consists of a guide cam installed movably in the horizontal direction on the lower mold, and a processing cam installed relatively movably on the guide cam. In a press die in which a guide cam and a processing cam are moved relative to each other and curved blades provided on opposing surfaces of the guide cam and processing cam approach each other to bend an edge of a workpiece, the curved blade of the processing cam is A shaft is fixedly installed on the end face of the provided side by penetrating the guide cam in the direction of the moving axis of the processing cam, and a back-up receiver is attached to the lower die of the part opposite to the back surface of the part provided with the curved blade of the guide cam. A block and an operating arm that rotates as the shaft moves forward and backward are provided, and the operating arm intervenes between the back surface of the curved blade portion of the guide cam and the back-up receiving block when the press is at the bottom dead center, and the press is at the top dead center. A backup device for a press-type guide cam, characterized in that it is provided with a backup roller that pivots to a retracted position when a press-type guide cam is activated.