JP2788492B2 - Press mold - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a press die, and more particularly, to a press die that presses a workpiece while holding the workpiece with a stripper.

(Prior Art) As a conventional press die of this type, the one shown in FIG. 3 is known.

In FIG. 3, when the close along the axis L ₁ in a die 3 supported the punch holder 1 on the die holder 2, firstly,
A spring 5 disposed between the punch holder 1 and the stripper 4 is contracted, and the workpiece 6 is pressed by the die 3 by the urging force of the spring 5. Then, the punch 6 is supported by the punch holder 1. 7 is to be punched.

The stripper bolt 8 supports the stripper 4, and the punch plate 9 supports the punch 7 on the punch holder 1.

(Problems to be Solved by the Invention) However, such a conventional press die has a structure in which the work material 6 is pressed by the urging force of the spring 5, so that the work material 6 can be pressed. When a large force is required, there is a problem that the mold becomes large or cannot cope, and there is a problem that maintenance becomes difficult.

That is, when a large force is required to press the workpiece 6, a large number of springs 5 need to be disposed between the punch holder 1 and the stripper 4, and the mold has been increased in size. In particular, when a very large force is required to press, even if a large number of springs 5 are provided, the force for bringing the punch holder 1 closer to the die holder 2 can be obtained by the urging force of the springs 5.
Less than 15% couldn't handle such a case.

Further, since the force for holding the workpiece 6 changes due to a change in the characteristics of the spring 5 with time, the spring 5 needs to be replaced frequently, which has made maintenance difficult.

(Objects of the Invention) Accordingly, the present invention provides a large-sized mold by allowing the ratio of the magnitude of the force for holding the workpiece to the magnitude of the machining force for punching to be freely set without using the biasing force of the spring. It is an object of the present invention to make it possible to sufficiently increase the force for holding a work piece without changing the shape of the workpiece, and to facilitate the maintenance of the mold.

(Constitution of the Invention) In order to achieve the above object, a press die according to the present invention is relatively approached to and separated from a die along a predetermined axis, is opposed to the die, and is inclined with respect to the predetermined axis. A cam driver having a first inclined surface, a stripper provided between the die and the cam driver, and slidably supported by the stripper so as to be movable in a direction perpendicular to the predetermined axis; A slide member having a second inclined surface that abuts against the die, and having a third inclined surface that is opposite to the die and that is inclined with respect to the predetermined axis at the other end; and a sliding member that slides along the predetermined axis. A punch having a fourth inclined surface that is movably supported and abuts on the third inclined surface.

 Hereinafter, a specific description will be given based on examples of the present invention.

1 and 2 are views showing an embodiment of a press die according to the present invention.

 First, the configuration will be described.

1 and 2, reference numeral 11 denotes a die, and the die 11 is supported by a die holder 12. 13 is a cam driver which is supported by the drive member 14 driven in the axial L ₂ direction by the press drive portion (not shown), the cam driver 13 driving member
Relatively toward and spaced die 11 along the axis L ₂ by driving the 14. The cam driver 13 is the first
It has an inclined surface 13a, the first inclined surface 13a has an angle α inclined to the axis L _2. A stripper 15 is provided between the die 11 and the cam driver 13, and the stripper 15 is
The support member 16 supports the drive member 14. The stripper 15 has a slide base 15a, and the slide base 15a slidably supports a slide member 18. The slide member 18 slides in the slide member 18 to move in a direction perpendicular to the axis L _2, and a second inclined surface 18a which abuts the first inclined surface 13a at one end. The slide member 18 has a third inclined surface 18b which faces the die 11 to the other end, the third inclined surface 18b is an angle β inclined to the axis L _2. Reference numeral 19 denotes a punch slidably supported by the stripper 15;
Slides so moves along the axis L _2, a third inclined surface 18
It has a fourth inclined surface 19a abutting on b. Also punch 19
Is adapted to receive an upward biasing force shown in FIGS. 1 and ₂ along the axis L2 from a spring 20 provided between the punch 19 and the stripper 15. Reference numeral 21 denotes a backup plate supported by the stripper 15, and the backup plate
Numeral 21 designates the displacement of the cam driver 13 in the direction of arrow A in FIG. A workpiece 22 is arranged between the stripper 15 and the die 11, and an upper die 23 is constituted by the member on the upper side of FIG.
The lower mold 24 is constituted by the member 22 on the lower side in FIG. That is, the upper die 23 is constituted by the driving member 14, the cam driver 13, the slide member 18, the punch 19, the stripper 15, the spring 20, the backup plate 21 and the bolt 16, and the lower die 24 is constituted by the die 11 and the die holder 12. .

 Next, the operation will be described.

First, when the driving member 14 is driven in the downward direction in FIGS. 1 and ₂ along the axis L2, the upper die 23 approaches the lower die 24, and the stripper 15 is moved as shown in FIG. Contact 22. Next, when the driving member 14 is further driven in the same direction, the first inclined surface 13a of the cam driver 13 contacts the second inclined surface 18a of the slide member 18 and the third inclined surface 18b of the slide member 18 at this time. Is in contact with the fourth inclined surface 19 a of the punch 19, the movement of the punch 19 is restricted by the workpiece 22, and the driving force of the driving member 14 is
Join 18 The force applied to the slide member 18 is divided into a vertical component G and a horizontal component F in FIG. 2 corresponding to the angle α, so that the stripper 15 is separated via the slide base 15a. The workpiece 22 is pressed by the force G, that is, the workpiece 22 is pressed against the die 11 by the force of the component G by the stripper 15. A force is applied to the punch 19 from the slide member 18 by a component force F, and the force applied to the punch 19 corresponds to the vertical component N and the horizontal component M in FIG. Therefore, the workpiece 22 is pressed by the force of the component force N from the punch 19 against the urging force of the spring 20, and is punched out. On the other hand, the component force M is canceled by the reaction force from the stripper 15.

As described above, in the present embodiment, the magnitude of the force for pressing the workpiece 22 and the magnitude of the processing force for punching the workpiece 22 are proportional to the magnitude of the reaction force that the punch 19 receives from the workpiece 22, and Since the ratio between the two can be set freely by a combination of the angles α and β, for example, the pressing force can be made very large to be larger than the punching processing force. Therefore, the size of the mold can be reduced as compared with the conventional one in which a large number of springs are provided to increase the pressing force. Further, it is possible to sufficiently cope with a case where a very large pressing force is required, thereby preventing deformation of the workpiece 22 or the like.

On the other hand, since the force for pressing the workpiece 22 is not due to the urging force of the spring, the maintenance of the mold can be facilitated as compared with the conventional one which requires the spring to be changed over time.

(Effect) According to the present invention, the ratio of the magnitude of the force for pressing the workpiece to the magnitude of the machining force for punching can be freely set without using the biasing force of the spring. The force for holding the workpiece can be sufficiently increased without increasing the size. In addition, it is possible to eliminate the need for replacing the spring due to a change over time, thereby facilitating the maintenance of the mold.

[Brief description of the drawings]

1 and 2 are views showing an embodiment of a press die according to the present invention. FIG. 1 is a cross-sectional view thereof, FIG. 2 is an enlarged cross-sectional view of an essential part thereof, and FIG. 3 is a conventional press die. FIG. 11 ... die, 13 ... cam driver, 13a ... first inclined surface, 15 ... stripper, 18 ... slide member, 18a ... second inclined surface, 18b ... third inclined surface, 19 ... punch , 19a ... The fourth inclined surface.

Claims (1)

(57) [Claims] A cam driver having a first inclined surface relatively approaching and separating from the die along a predetermined axis, facing the die, and having a first inclined surface inclined with respect to the predetermined axis; A stripper provided between the drivers; a stripper slidably supported by the stripper so as to be movable in a direction perpendicular to the predetermined axis; a second inclined surface abutting on the first inclined surface at one end; A sliding member having a third inclined surface facing the die and inclined with respect to the predetermined axis, and slidably supported by a stripper so as to be movable along the predetermined axis, and abutting on the third inclined surface. And a punch having a fourth inclined surface.