KR20140114507A

KR20140114507A - Press mold

Info

Publication number: KR20140114507A
Application number: KR1020130027733A
Authority: KR
Inventors: 조용균; 정준영; 이준범
Original assignee: 삼성전자주식회사
Priority date: 2013-03-15
Filing date: 2013-03-15
Publication date: 2014-09-29

Abstract

A press mold capable of suppressing generation of burrs when piercing or blanking the material is disclosed.
According to the present invention, a press die includes a die and a die, a stripper movably installed so as to press and fix the material together with the die, a punch for moving back and forth along a hole formed in the die and the stripper, And protrusions protruding from the periphery of at least one of the holes to prevent formation of burrs in the material at the time of perforation.

Description

Press mold {PRESS MOLD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die, and more particularly, to a press die for simultaneously piercing various portions of a plate material.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a press die, and more particularly, to a press die having an improved structure for minimizing generation of burrs when piercing a workpiece.

In general, a press die includes a blanking die for cutting a predetermined shape from a work according to a method of processing the work, and a piercing die for performing a punching operation for drilling a hole in a material to be used as a product.

When a blanking die or a piercing die is used to cut a material, a clearance is formed between a stripper fixing the material to the portion cut by the punch and a punch for pricing the material, A portion may be deformed and a burr may be generated. The length of the burr may be increased depending on the type and thickness of the material and other production conditions, and the burr is generally formed in an irregular shape.

However, when a hole is formed by piercing, such as an inner surface of a refrigerator, and a component such as an instrument is provided in the hole, a gap may be formed between the hole and the component by a burr formed in the hole. If the gap is left untouched, the foaming liquid may leak during the foaming of the heat insulating material between the trauma and the inner surface. Therefore, it is required to further work for attaching a tape to fill the gap between the hole and the part, and to develop a press mold capable of minimizing generation of burr when the inner ear is pierced so as to omit the taping operation A necessity arises.

One aspect of the present invention provides a press mold capable of suppressing generation of burrs when piercing or blanking the material.

According to an aspect of the present invention, a press die includes: a die;

A stripper movably installed to press the material together with the die;

A punch for advancing and retreating along a hole formed in the die and the stripper, for punching the material; And

And protrusions protruding from at least one of the holes formed in the die and the stripper to prevent burrs from being formed in the material at the time of perforation.

The protrusion may include a horizontal surface protruded to press the material, and a vertical surface recessed from the horizontal surface to form a step.

The protrusion may include a horizontal surface protruded to press the material and an inclined surface inclined in a direction of being recessed from the horizontal surface.

The protrusion may include two surfaces inclined with respect to one surface of the workpiece, and may have a triangular section.

The protrusion may include a sloped surface inclined with respect to one surface of the workpiece and a vertical surface perpendicular to the surface of the workpiece, and the cross section may be formed as a right triangle.

The width of the horizontal plane may be 0.8 to 1.2 mm.

The height of the protrusions may be 0.2 to 0.4 mm.

According to an aspect of the present invention, a press die includes: a die;

A stripper installed vertically movably on an upper portion of the die to fix the material together with the die;

And a punch for advancing and retreating along the hole formed in the die and the stripper for punching the material,

The die may include protrusions protruding along the periphery of the hole to prevent formation of burrs in the material during perforation.

According to the press mold according to the embodiment of the present invention, even if the condition of the material, the processing conditions and the like cause a lot of burrs, it is possible to suppress the occurrence of burrs as much as possible.

Therefore, additional work such as trimming can be omitted in a pierced hole after a pressing operation such as piercing. In particular, when a workpiece is the inner surface of a refrigerator, a gap is formed between the processing hole and the component when the component is installed in the processing hole There is no need to perform taping work to fill the gap in the filling of the insulation between the trauma and the inner side, thereby remarkably reducing the production cost of the product.

1 is a schematic view showing a press mold according to an embodiment of the present invention.
2 is an enlarged view of a portion A in Fig.
3 is an enlarged perspective view showing a cutting hole portion of the lower die shown in Fig.
Fig. 4 is an enlarged view showing a state after piercing the material by punching. Fig.
Fig. 5 is an enlarged view of a protruding portion in Fig. 4. Fig.
6 to 9 are views showing the structure of a projection according to another embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a press die according to an embodiment of the present invention, FIG. 2 is an enlarged view of a cutting hole portion in which a workpiece is fixed by a stripper, FIG. 3 is a cross- Fig. 4 is an enlarged view showing a state after piercing the workpiece by a punch. Fig.

1, the press mold 10 includes an upper holder 20, a lower holder 30, and a guide post 40. As shown in FIG.

The upper holder 20 is fixed to a ram (not shown) of a press (not shown) by the shank 50 and can be configured to move up and down according to the guide of the guide post 40 by the operation of the ram. A backing plate 21 and a punch plate 22 are provided in the upper holder 20 and a plurality of mounting holes 22a are formed in the punch plate 22 so that the punch 23 is inserted into the mounting hole 22a And is fixedly mounted on the backing plate 21 and the punch plate 22. The guide post 40 is installed between the upper holder 20 and the lower holder 30 and supports the upper holder 20 movably in the vertical direction with respect to the lower holder 30.

A stripper (24) for fixing the work together with the die (31) is provided at the lower part of the punch plate (22). The stripper 24 is provided with a stripper bolt 25 provided between the upper holder 20 and the stripper 24 and an elastic member 26 provided between the punch plate 22 and the stripper 23, . Therefore, after the stripper 24 moves down with the upper holder 20 by the operation of the ram and contacts the work P, the stripper 24 presses the work P together with the die 31 in the stopped state, And the workpiece P can be processed while the punch 23 continues to move downward. This stripper 24 may be provided on the die 31 instead of the punch plate 22. [

The stripper 24 and the die 31 are provided with cutting holes 24a and 31a on the same vertical axis in order to ensure vertical movement of the punch 23. In the lower holder 30, And a discharge hole 30a for discharging the scrap (S, see Fig.

The punch 23 can be installed on the punch plate 22 by the number of parts to be processed such as piercing on the workpiece P. In the illustrated embodiment, three punches 23 are provided , Which is an example only and can be configured to process the material simultaneously through a greater number of punches as needed.

2 to 4, the protrusion 100 may be provided along the periphery of the cutting hole 31a in the upper end portion 31b of the die 31. As shown in FIG. The protrusion 100 may be provided on a part of the periphery of the cutting hole 31a or may be formed on the entire circumference of the cutting hole 31a as shown in FIG.

The protrusion 100 may be formed as a step protruding from the upper surface of the die 31 by a predetermined height. The protrusion 100 has a horizontal surface 101 protruding from the upper surface 31b of the die 31 at a predetermined height and in contact with the workpiece and a different surface of the upper surface 31b of the die 31 on which the protrusion 100 is not formed And a vertical surface 102 formed in a vertical direction between the portion and the horizontal surface 101.

When the material P is pierced or blanked, burrs may be formed on the cut surface of the material P during the cutting process by the punch 23, The protrusion 100 plays a role of suppressing the occurrence of burrs as much as possible even in a condition in which the material P and processing conditions are likely to generate a lot of burrs.

The protrusion 100 causes the pressing force to be concentrated on the peripheral portion of the cutting hole 31a by the protruding portion when the stripper 24 is lowered to press the work P so that the portion around the cutting hole 31a So that a part of the fractured portion of the material P is cut in the cutting hole 31a of the die 31 in the advancing direction of the punch 23 when the material P is broken by the punch 23 as shown in Fig. So that burrs are prevented from being generated.

Fig. 5 is an enlarged view of a portion A in Fig. 4, and the projection 100 can be protruded by a height H from the upper surface 31b of the die 31 by the vertical surface 102 thereof. If the height H is large, the pressing force can be reliably concentrated by the projection 100, but unnecessary deformation may occur at the cut portion of the work P. Therefore, the height H of the projection 100 may be set to a minimum height for largely applying a pressing force around the cut hole 31a, and the height H may be formed to be 0.2 to 0.4 mm. Experiments have shown that the generation of burrs can be sufficiently suppressed when the height of the projection 100 is about 0.3 mm.

In addition, if the width W of the projection 100 is large, the effect of dispersing the pressing force to reduce unnecessary deformation that may leave the post-processing material is suppressed by the projection 100 by dispersion of the pressing force It may be reduced by that amount. Therefore, the width W of the projection 100 may be 0.8 to 1.2 mm.

6 to 9 illustrate the structure of a projection according to another embodiment of the present invention. According to the embodiment shown in FIG. 6, it is the same as the embodiment according to FIGS. 1 to 5 as described above, except that the protrusion 110 includes the protruding horizontal surface 111, And the inclined surface 112 is inclined in a direction in which the inclined surface 112 is inclined. The protrusions 110 are configured such that the pressing force applied to the work P by the protrusions 110 is increased to suppress the generation of burrs and at the same time the deformation .

According to the embodiment of FIG. 7, the projection 120 may include two surfaces 121 and 122 inclined with respect to one surface of the work P, and its cross section may be formed as a triangle. According to the embodiment according to FIG. 8 The protrusion 130 includes a sloped surface 131 inclined with respect to one surface of the work P and a vertical surface 132 parallel to the surface of the die 31 forming the cutting hole 31a, As shown in FIG.

The configuration of the protrusions 120 and 130 as in the above two embodiments facilitates concentrating the pressing force applied to the work P so as to more reliably suppress the generation of burrs, The pressing force is concentrated on the end of the protrusion 120 and the protrusion 120 may be deformed, and the material P may also be deformed. Therefore, even if the material P is a soft material such as a plastic material and a deformation such as a mark pressed by the protrusions 120 and 130 occurs on the surface of the material P in contact with the protrusions 120 and 130 Can be applied.

9 shows a structure in which protrusions 140 protrude from the lower surface 24b of the stripper 24 contacting the workpiece P, instead of providing protrusions on the die 31. As shown in FIG. Even if the protrusion 140 is provided on the stripper 24, the pressing force can be concentrated on the portion where the material P is broken. Thus, the effect of suppressing the generation of burrs Can be expected. Although FIG. 9 shows an example in which the protrusion 140 is formed as a step as shown in FIG. 2, it goes without saying that the structure of the protrusion according to FIGS. 6 to 8 can be applied to a stripper as shown in FIG.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, modifications or variations are intended to fall within the scope of the appended claims.

10: press mold 20: upper holder
23: Punch 24: Stripper
30: Lower holder 31: Die
31a: cutting hole 100: projection
101: horizontal plane 102: inclined plane
P: Material

Claims

die;
A stripper movably installed to press the material together with the die;
A punch for advancing and retreating along a hole formed in the die and the stripper, for punching the material; And
And protrusions protruding from at least any one of the holes formed in the die and the stripper to prevent formation of burrs in the material at the time of perforation.

The method according to claim 1,
Wherein the protrusion includes a horizontal surface protruded to press the material and a vertical surface recessed from the horizontal surface to form a step.

The method according to claim 1,
Wherein the protrusion includes a horizontal surface protruded to press the material and an inclined surface inclined in a direction of being recessed from the horizontal surface.

The press mold according to claim 1, wherein the projection includes two surfaces inclined with respect to one surface of the work, and the end surface is formed into a triangle.

The press mold according to claim 1, wherein the protrusion includes a sloped surface inclined to one surface of the workpiece and a vertical surface perpendicular to the one surface, the cross-section of the protrusion being formed as a right triangle.

The press die according to claim 2 or 3, wherein the horizontal plane width is 0.8 to 1.2 mm.

The press mold according to claim 1, wherein a height of the protrusion is 0.2 to 0.4 mm.

A lower die;
A stripper installed vertically movably on an upper portion of the lower die to fix the material together with the lower die;
And a punch for advancing and retreating along a hole formed in the lower die and the stripper,
Wherein the lower die is protruded along the periphery of the hole to prevent a burr from being formed in the material at the time of perforation.