JPS6024231A - Construction for attaching working cam with press die device - Google Patents

Abstract

PURPOSE:To smooth the sliding contact of a working cam of an upper die and to prevent the damage and seizure thereof with a mechanism for performing horizontal pressing by the sliding press-contact of the working cam with a driven cam provided to a lower die by providing movable clearances to the working cam. CONSTITUTION:A working cam 15 is movable attached by means of bolts 19 and springs 20 into the groove part of an upper die cam holder 13. Clearances S1 are provided to both sides of the cam 15. When the upper die descends, the front end of the cam 15 contacts slidingly under pressure with the mutual grades part 15C of the backup member 4 of a lower die 1 and a driven cam 5, thereby pressing horizontally the cam 5. A work W is then horizontally pressed by a die 8. The cam 15 is smoothly inserted into the inserting part by the clearances S1 and the clearance S2' generated by the springs 20, by which the damage and seizure thereof are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of mounting an operating cam in a press-type device.

Conventionally, an operating cam disposed in an upper die cam holder is lowered between a backup member and a passive cam of the lower die, and the cam surface of the operating cam presses the die at the front end of the passive cam together with the passive cam. There is a press-type device that advances it toward a surface. In this case, the operating cam is immovably fixed to the cam mounting portion of the cam holder by a fitting means or a tightening bolt. For this reason, during press molding in which the operating cam descends between the backup member and the passive cam, the above-mentioned individual abutting system may have a structure in which the operating cam hits the passive cam or the backup member is easily bent. Unbalanced loads and bending forces act on the actuating cam due to the reaction force caused by the bending of the back-up member. The operating cam may be damaged (
In some cases, the operating cam may be damaged (broken, unevenly worn, etc.), or the operating cam may seize between the backup member and the passive cam.

The purpose of this invention is to solve the above-mentioned conventional problems. An actuating cam that can reduce unbalanced loads and bending forces acting on the actuating cam to prevent damage to the actuating cam, seizure, etc. The installation is to provide structure.

Therefore, in this invention, the operating cam is movably attached to the cam attachment part of the cam holder, and during press molding when the operating cam is lowered between the backup member and the passive cam,
By moving the operating cam back and forth or in the left-right direction, the unbalanced load and bending force acting on the operating cam are reduced.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 showing the press mold apparatus, a lower mold 1 disposed on the upper surface of the press mold is mainly composed of a lower mold main body 2, a mandrel 3°, a backup member 4, and a passive cam 5. A passive cam 5 slidably fitted to the upper surface of the lower die main body 2 so as to be movable back and forth is supported by a support pin 6 fitted into the backup member 4, and urged in the backward direction by a return spring 7. A die 8 is fixed to the front end surface of the cam 4.

The upper die 11 disposed on the lower surface of the press ram has an upper die main body 12.
, a cam holder 13, a punch 14, and an operating cam 15.A mounting groove 16 corresponding to the operating cam 15 is vertically formed in the cam mounting portion on the side surface of the cam holder 13. At the upper end, as shown in FIG.
is formed with an engaging cE surface 18.

The mounting groove 16 of the cam holder 13 has a predetermined gap Sl between both sides of the cam holder, as shown in FIG.

The actuating cam 15 is fitted so as to be movable by a predetermined amount in the left and right direction with S1, and the actuating cam 15 is attached so as to be movable in the front and back direction by a support bolt 19 and is attached by an elastic body (a coil spring in this embodiment) 20. Immediately before contacting the abutment cam 5 with the bottom surface of the groove 16, the actuating cam 15 is held in contact with the bottom surface of the mounting groove 16 by the biasing force of the elastic body 20, as shown in FIG.
The back surface of the actuating cam 15 and the support surface 4a on the front surface of the back-up member 4 are separated by a predetermined gap S2 in the front-rear direction. When the operating cam 15 descends to the bottom dead center together with the cam holder 13, the operating cam 1
5 is supported by the support surface 4a of the backup member 4, and a predetermined gap S2' is created between the operating cam 15 and the bottom surface of the mounting groove 16, as shown in FIG.

Further, a flange 5a that engages with the locking surface 18 of the holding groove 17 is formed at the upper end of the operating cam 15, and between this flange 5a and the upper mold body 12, the operating cam 15 is Bearing 2 for smooth left and right movement
1 is interposed.

Further, on the lower front surface of the operating cam 15, when the cam descends between the backup member 4 and the passive cam 5, the die 8 and the passive cam 5 are attached to the workpiece W set on the mandrel three times. A cam surface 15c for advancing toward the press surface to the forward end position is formed corresponding to the cam surface 5c of the passive cam 5.

During press molding in which the actuating cam 15 is lowered between the movable cam 5 and the movable cam 5, the cam surface 15c of the actuating cam 15 contacts the cam surface 5c of the passive cam 5, and then slides along the cam surface 5C.
This feeding action causes the passive cam 5 to move forward against the biasing force of the return spring 7. Then, when the die 8, which advances integrally with the passive cam 5, comes into contact with the pressing surface of the workpiece W, the actuating cam 15 resists the urging force of the elastic body 20 and presses against the support surface 4a of the backup member 4. It descends while retreating until it touches the position. When the operating cam 15 descends to the bottom dead center, the passive cam 5 and die 8 move forward to the forward end position, and the press surface of the workpiece W is pressed.

Now, when the cam surface 15c of the actuating cam 15 comes into uneven contact with the cam surface 5c of the passive cam 5 during the above-mentioned press forming, the actuating cam 15 will be moved between the cam 15 and the mounting groove 16. While moving in the left and right direction by an amount corresponding to the amount of gap SL, the backup member 4 and the operating cam 1
This prevents an unbalanced load from acting on the gap operating cam 15 between the cam 15 and the cam 15. Furthermore, due to the gap S2 between the actuating cam 15 and the bank up member 4, the backup member 4
deflection is reduced, and the reaction force is reduced accordingly. Therefore, the bending force acting on the actuating cam 15 is reduced.

In addition, in the above embodiment, in order to smooth the movement of the actuating cam 15 in the front-back direction and the left-right direction, the actuating cam 15 is
A bearing 21 is interposed between the upper surface of the flange 15a and the lower surface of the upper die main body 12, but instead of this bearing 21, a plate made of a material with a small coefficient of friction, for example, a plate made of a ceramic material is interposed. Well done, Ma.
The upper surface of the flange 15a of the actuating cam 15 may be slidably abutted against the lower surface of the upper die main body 12.

That is, according to the present invention, it is possible to reduce the unbalanced load and bending force acting on the operating cam, thereby preventing damage to the operating cam, seizure, etc., and improving durability. be.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a side sectional view showing the state of the operating cam when the upper mold is in the raised position relative to the lower mold, and Fig. 2 shows the attachment of the operating cam and the cam holder. FIG. 3 is a front view showing the state of engagement with the groove, and a side sectional view showing the state of the operating cam when the upper mold is lowered to the bottom dead center with respect to the lower mold. 1...Lower mold 4...Backup member 5...Passive cam 11...Upper mold 13...
・Cam holder 15... Operating cam Applicant: Toyota Motor Corporation Representative Patent attorney Oka 1) Hidehiko

Claims (1)

[Claims] The operating cam disposed in the cam holder of the upper die is lowered between the backup member of the lower die and the passive cam, and the cam surface of the operating cam moves the die at the front end of the cam together with the passive cam to the pressing surface of the workpiece. In a press-type device that is moved forward toward the target, the cam mounting portion of the cam holder is provided with a cam mounting portion so that the operating cam can move in the front-rear direction or left-right direction during press molding in which the operating cam is lowered between the backup member and the passive cam. On the other hand, the mounting of the operating cam in a press-type device, which is characterized by having the operating cam movably mounted, is structured.