JPH0767575B2 - Press die for opening edge cutting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a press metal for cutting an open end for straightly cutting an open end of a metal press-formed product formed into a bowl shape, a tubular shape or the like. It is about the type.

[Conventional technology]

A press die conventionally known as a shimmy die (commonly known as an eromeki die) is used to cut and finish the opening edge of a metal press-formed product formed into a bowl shape, a tubular shape, etc. with a press machine. ing. In this open-ended mold, the lower slide body that fits inside the opening edge of the molded product is configured to make a rectangular motion in the lateral direction by the action of the cam during pressing, and the outer peripheral edge of the upper end of the slide part is A shearing force is applied to the opening edge so that the opening edge of the molded product can be cut.

[Problems of conventional technology]

However, in the conventional press mold for cutting the open end, the cam pieces opposed to the cam projections formed on the four peripheral surfaces of the slide body of the lower mold are fixed to the mounting base of the lower mold by bolts or the like. Therefore, when the upper mold moves down, the cam action causes the slide body to make a rectangular motion in the lateral direction to cut the opening edge of the molded product, and then when the upper mold moves up, the trajectory opposite to that when the slide mold descends. Follow to return to the original. For this reason, the slide body slides against the cut end of the molded product again even when it rises, and moves so as to re-cut the cut end, which may cause burrs on the cut end, resulting in poor finish and cutting edge. There was a problem of accelerating the wear of the.

[Means for solving problems]

The press die for cutting an open end of the present invention is intended to solve the above-mentioned problems. It is composed of a lower die and an upper die, and the lower die is provided with a horizontal plate biased upward in a die holder so as to be vertically movable. ,
A slide body is provided on the horizontal plate so as to be slidable in a horizontal plane, cam convex strips are formed on the four peripheral surfaces of the slide body, and a mounting base is fixed on the die holder so as to surround the four peripheral surfaces of the slide body. Then, the mounting base is provided with a cam piece whose wedge-shaped tip is slidably contacted with the cam convex shape, and the upper die is provided with a concave recess capable of holding a molded product, and is slid inside the opening edge of the molded product. The slide body is pressed down together with the horizontal plate by lowering the upper mold so that the bodies are aligned with each other, and at that time, the cam piece acts to slide the slide body in the horizontal plane and the outer peripheral edge of the upper end of the slide body. In a press die for opening end cutting configured to exert a shearing force on the opening end edge of the molded product, a vertical guide hole is formed in the mounting base that is inclined upward and outward, and the guide hole is formed along the guide hole. A cam piece is provided so that it can move up and down diagonally, and the lower part of the cam piece The inner edge of the mounting base so that the rising angle of the guide hole with respect to the horizontal plane is greater than the inclination angle of the upper working surface of the wedge-shaped tip of the cam piece with respect to the horizontal plane. It is characterized by being set.

[Action]

When the slide body descends due to the lowering of the upper die, the cam piece acts on the cam ridge of the slide body and the slide body slides in the horizontal plane to cut the opening edge of the molded product, but the upper die rises. When the slide body rises due to the cam, the cam protrusion does not act as a cam by raising the cam piece along the guide hole in the form of an inclined vertical hole.Therefore, when the upper die is raised, the slide body slides in the horizontal plane. Therefore, it is possible to prevent the cut end of the molded product from sliding again on the slide body.

[Embodiment] Next, an embodiment of a press die for cutting an open end of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a lower mold and 2 is an upper mold. The lower mold 1 is provided in a rectangular frame-shaped die holder 3 so that a flat plate-shaped horizontal plate 4 can be moved up and down while maintaining a horizontal state. The horizontal plate 4 is a plane square, and an extension portion 30 is formed in the center of the two opposite sides thereof. A bolt 5 extending upward is fixed to the extension portion 30 and the bolt 5 is fixed to the coil spring 6.
The horizontal plate 4 is urged upward by being lifted up by the elasticity of. Reference numeral 7 denotes a slide body provided on the horizontal plate 4 so as to be slidable in a horizontal plane. The slide body 7 is composed of a flat square base portion 8 and a circular cut portion 9 provided on the base portion 8, and both are integrally fixed by a bolt 10. Then, cam projections 8a to 8d are formed on the outer peripheral surface of the base portion 8. Reference numeral 11 denotes a collar with a collar that is loosely fitted in a fool hole 12 formed on the horizontal plate 4 and fixed to the lower surface of the slide body 7 with a bolt 13. The collar portion of the collar 11 is brought into contact with the lower surface of the horizontal plate 4. The slide body 7 is slidably held on the horizontal plate 4. Further, 14 is a truncated cone-shaped core provided on the slide body 7 separately from the slide body 7, and a collar 16 with a collar is loosely fitted in a stepped fool hole 15 formed at the center of the core. By fixing the collar 16 with the collar to the slide body 7 with the bolt 17, the core 14 is placed on the slide body 7 without hindering the movement of the slide body 7 in the horizontal plane. There is. Reference numeral 18 indicates that the slide body 7 is settled at the center position on the horizontal plate 4 by pressing the spherical body 20 against the opening edge of the core hole 19 formed in the lower surface of the core 14 by the coil spring 21 provided in the spring chamber of the slide body 7. It is a centripetal mechanism that functions like. Reference numeral 22 denotes a square frame-shaped knockout plate for chip discharge, which is provided so as to surround the base 8 of the slide body 7. The knockout plate 22 is biased upward by the coil spring 23 on the base 8. Is provided.
On the other hand, 24 shown in FIG. 3 is a prismatic base piece fixed to the four corners of the base portion 8 by bolts 51. The base piece 24 has a flange portion 25 projecting outward at an upper end portion thereof. The knockout plate 22 is engaged so that the knockout plate 22 is not disengaged from the slide body 7 side. Reference numeral 26 is a cubic mounting base fixed to the die holder 3 by bolts 27 so as to surround the four sides of the slide body 7. The mounting base 26 is formed with a spring chamber 28 for accommodating the coil spring 6. There is provided a cam piece 36 whose wedge-shaped tip portion 29 is in sliding contact with the cam protrusions 8a to 8d. That is, a vertical guide hole 37 is formed on the mounting base 26 and is inclined upward and outward, and a cam piece 36 is provided so as to be vertically movable along the guide hole 37.
The lower end of the cam piece 36 is bent inward in a V shape and its tip 29 is formed.
Project from the inner surface of the mounting base 26 and are in sliding contact with the cam protrusions 8a to 8d. 38 is a coil spring that presses the cam piece 36 downward, and 39 is a screw that fixes the upper end of the coil spring. The standing angle α of the guide hole 37 with respect to the horizontal plane is
The inclination angle β of the upper working surface 29a of the wedge-shaped tip portion 29 of the cam piece 36 with respect to the horizontal plane is made larger.

Reference numeral 40 is a guide column that guides the upper mold 2 downwardly with respect to the lower mold 1.

In the upper mold 2, a frame-shaped backing plate 43 is fixed by a bolt 42 on a lower surface of a plate-shaped die plate 41, and a punch 44 is fixed to a lower end of the backing plate 43 by a bolt 52. The punch knockout plate 45 is held in the backing plate 43 so as to be vertically movable. Reference numeral 46 is a coil spring that biases the punch knockout plate 45 downward. Further, 47 is a knock pin which is fixed to the punch 44 by a screw 49 and projects downward from the punch 44.

The cam ridges 8a to 8d are formed so that the height positions thereof are slightly different on the four peripheral surfaces of the slide body 7, as shown in FIGS. 4a to 4d.

In the open-end cutting press die having the above-described structure, the core 48 of the lower die 1 is the molded product 48 in which the bowl shape is press-formed in advance.
As shown in FIG. 5, the molded product 48 is clamped by the punch knockout plate 45, and the punch 44 is inserted through the base 24 to slide the slide member 7 when the upper mold 2 is lowered. To reduce. Then, as shown in FIG. 6, against the elasticity of the coil spring 6, the horizontal plate 4 is moved together with the slide body 7.
While moving down, the wedge-shaped tip portion 29 of the cam piece 36 acts on the cam ridges 8a to 8d at that time, and the slide body 7 makes a rectangular motion on the horizontal plate 4. Therefore, the outer peripheral edge of the upper end of the base portion 8 of the slide body 7 cuts the entire circumference of the opening edge of the molded product 48. When the slide body 7 descends, the inclination angle β of the action surface 29a of the tip portion 29 is smaller than the standing angle α of the guide hole 37, and therefore the cam piece 36 in the guide hole 37 is not moved upward and the tip portion is not moved. Department
29 is kept protruding from the inner surface of the mounting base 26. When the upper mold 2 is lifted by cutting the opening edge of the molded product 48 in this way, the slide body 7 is restored upward by the elasticity of the coil spring 6, and at that time, the cam ridges 8a to 8d contact the tip portion 29 again. However, at this time, the cam piece 36 is moved upward along the guide hole 37 against the elasticity of the coil spring 38 and the tip 29 is retracted, so that the slide body 7 does not slide on the horizontal plate 4. Straight up. Then, the knockout plate 22 is lifted by the coil spring 23 to discharge the chips 50.

〔The invention's effect〕

As described above, in the opening end cutting press die of the present invention, the cam piece is provided so as to be movable up and down diagonally, so that when the slide body returns to the upper side, the cam piece acts on the cam ridge of the slide body. Since the slide body is prevented from moving horizontally unnecessarily, it is possible to avoid the cut end of the molded product from coming into sliding contact with the slide body again when the upper die is raised. For this reason, the finish is improved without causing a defective shape such as burrs due to cutting the cut end twice, and the number of times of action of the slide body is halved, so that the wear is reduced, which is a beneficial effect.

[Brief description of drawings]

The drawings show one embodiment of a press die for cutting the open end of the present invention. FIG. 1 is a vertical sectional view when the die is opened, FIG. 2 is a half sectional plan view of a lower die, and FIG. FIG. 2 is a sectional view taken along line AA of FIG.
4a to 4d are longitudinal sectional views of the cam ridge, FIG. 5 and FIG.
The figure is a vertical cross-sectional view showing the operation when the mold is closed. 1 ... Upper mold, 2 ... Lower mold, 3 ... Die holder, 4 ... Horizontal plate, 7 ... Slide body, 8a-8d ... Cam ridge, 14 ...
Core, 26 ... Mounting base, 29 ... Tip, 29a ... Upper working surface, 36 ... Cam piece, 37 ... Guide hole, 48 ... Molded product, α
…… Standing angle, β …… Inclination angle.

Claims (1)

[Claims] 1. A lower die and an upper die, wherein the lower die is provided with a horizontal plate urged upward in a die holder so as to be vertically movable, and a slide body is provided on the horizontal plate so as to be slidable in a horizontal plane. ,
Cam ridges are formed on the four peripheral surfaces of the slide body, and a mounting base is fixedly mounted on the die holder so as to surround the four peripheral surfaces of the slide body, and the wedge-shaped tip of the mounting base slides on the cam convex shape. Provide a cam piece to contact, a concave recess that can hold the molded product in the upper mold, and lower the upper mold so that the slide body matches the inside of the open end of the molded product so that the slide body is leveled. An opening configured such that the slide member slides in a horizontal plane by being pressed down together with the plate and the cam piece acts so that the outer peripheral edge of the upper end of the slide member exerts a shearing force on the opening edge of the molded product. In the end cutting press die, a vertical guide hole is formed in the mounting base that is inclined upward and outward, and a cam piece is provided so as to be vertically movable diagonally along the guide hole. Bend inward in a V shape and attach the wedge-shaped tip to the inner surface of the mount. Issued thereby, the guide hole upright angle wedge-like tip part upper working surface opening end cutting press die that characterized by being larger than the angle of inclination with respect to the horizontal plane of the cam piece with respect to the horizontal plane of the.