KR101762125B1

KR101762125B1 - Piercing press dies

Info

Publication number: KR101762125B1
Application number: KR1020150132257A
Authority: KR
Inventors: 임동석
Original assignee: 성일기업(주)
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2017-07-27
Also published as: KR20170054583A

Abstract

The present invention relates to a piercing die for perforating a thin plate material, and more particularly, to a piercing die capable of drilling a hole at an accurate position without slipping on a surface of a workpiece and improving the durability of the punch.
Wherein the piercing mold has a shape in which an upper surface thereof is engaged with a lower surface of a workpiece, and a workpiece is seated on an upper surface thereof; An upper mold moving up and down at an upper portion of the lower mold; A cam driver having a first inclined surface formed by chamfering a lower edge in a direction toward the lower mold and moving up and down along the upper mold; And a second inclined surface which is located below the cam driver and is parallel to the first inclined surface. The second inclined surface is pressed by the first inclined surface of the cam driver and moved horizontally Cam slides; A return spring for moving the cam slide in a direction away from the lower mold; A punch protruding from the cam slide in a direction toward the lower mold; A punch guide tube provided between the cam slide and the punch; A cushion spring located inside the punch guide tube and preventing the pressing force when the punch starts to touch the workpiece from being directly applied to the workpiece thereby reducing the possibility of the punch being damaged by the reaction; A part of the punch guide tube and a protective tube surrounding the punch, wherein a cap having a central through-hole is provided at one end of the protective tube; And a connection spring provided between the cam slide and the other end of the protection tube for elastically supporting the protection tube.

Description

Piercing press dies}

The present invention relates to a piercing mold for piercing a thin plate material, and more particularly, to a piercing mold for piercing a hole in a thin plate material, and more particularly to a piercing mold for piercing a surface of a workpiece, .

The steel sheet used to make the body and frame of an automobile is used for drawing, forming, restriking, trimming and piercing so as to have the shape and strength as designed. .

The forming process of the steel sheet as described above is performed by a press mold composed of a lower mold on which the steel sheet is placed and an upper mold which moves up and down on the lower mold and presses the steel sheet on the lower mold.

However, since the surface of the workpiece, which is close to the shape of the overall design through the forming step, is not flat, in order to pierce the hole in the workpiece, it is necessary to change the vertical movement of the upper- .

Open No. 10-2013-0053266 discloses a cam piercing device for a press die, which is one of the related arts related to this type of device. The cam pinion device has a lower one side edge of a cam driver 130, The upward and downward movement of the cam driver 130 can be converted into the movement of the cam slide 120 at an angle close to the male direction by the inclined slide portions 122 and 132 formed by chamfering one side edge.

However, since the forming punch 140 attached to the other side of the cam slide 120 and moving along the cam slide 120 receives the force applied to the cam slide 120 when the hole is drilled in the workpiece, The end portion can be easily damaged.

KR 10-2013-0053266 A

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above and it is an object of the present invention to provide a punch capable of relieving the impact applied to the punch when the punch of the punching die touches the surface of the workpiece to punch holes in the workpiece, The present invention has been made to solve the above problems.

According to a preferred embodiment of the present invention, there is provided a piercing mold for piercing a hole in a workpiece, the piercing mold having a shape in which an upper surface of the lower mold is engaged with a lower surface of the workpiece, An upper mold moving up and down at an upper portion of the lower mold; A cam driver having a first inclined surface formed by chamfering a lower edge in a direction toward the lower mold and moving up and down along the upper mold; And a second inclined surface which is located below the cam driver and is parallel to the first inclined surface. The second inclined surface is pressed by the first inclined surface of the cam driver and moved horizontally Cam slides; A return spring for moving the cam slide in a direction away from the lower mold; A punch protruding from the cam slide in a direction toward the lower mold; A punch guide tube provided between the cam slide and the punch; A cushion spring located inside the punch guide tube and preventing the pressing force when the punch starts to touch the workpiece from being directly applied to the workpiece thereby reducing the possibility of the punch being damaged by the reaction; A part of the punch guide tube and a protective tube surrounding the punch, wherein a cap having a central through-hole is provided at one end of the protective tube; And a connection spring provided between the cam slide and the other end of the protective pipe to elastically support the protective pipe.

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According to another embodiment of the present invention, an elastic plate is attached to the outer surface of the cap.

The piercing die according to the present invention can prevent the punch from being damaged by the pressing force of the cam slide because the punch for directly pressing the workpiece and punching holes in the workpiece is joined to the cam slide through the buffer spring.

The protective pipe formed around the punch can support the punch to further reduce the possibility of the punch being deformed.

1 is a sectional view of a piercing mold according to the present invention.
2 is an explanatory view of a protective tube of the piercing mold.

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piercing mold for perforating a thin plate material used for making a vehicle body and a frame of an automobile and can mitigate the impact applied to the punch when the punch touches the surface of the workpiece, . &Lt; / RTI >

1 is a sectional view of a piercing mold 1 according to the present invention.

The piercing mold 1 according to the present invention includes a lower mold 10, a top mold 20, a cam driver 30, a cam slide 40, a return spring 50, and a punch 60.

The lower mold 10 is a part where the workpiece 2 is seated during the piercing process and the upper surface of the lower mold 10 is engaged with the lower surface of the workpiece 2 so that the workpiece can be stably supported. This prevents the workpiece from being deformed by the applied load. A space larger than the hole is formed at a position coinciding with the hole to be formed in the workpiece in the lower mold 10 so that the piercing process can be easily performed and the scrap generated during the process can be discharged using the passage connected to the upper space .

The upper mold 20 moves up and down in the upper portion of the lower mold 10 to move the lower portion of the lower mold 10 during the piercing process so as to prevent the workpiece from moving and to move the cam driver 30 .

The cam driver 30 can move the cam slide 40 in the horizontal direction while moving the cam slide 30 in the vertical direction along the upper mold 20. That is, the lower edge of the cam driver 30 in the direction toward the lower die 10 is chamfered with the first inclined surface 31 positioned thereon, and the cam slide 40 is inclined with respect to the second inclined surface 31 parallel to the first inclined surface 31, The second inclined surface 41 is pushed and slid on the first inclined surface 31 and moved horizontally in the direction of approaching the lower mold 10 as the cam driver 30 moves downward .

The punch 60 protruding from the cam slide 40 toward the lower die 10 presses the workpiece 2 placed on the lower die 10 to make a hole in the workpiece. 1 shows a state in which the cam slide 40 is moved in the direction of the lower mold 10 by the cam driver 30 and the punch 60 makes a hole in the workpiece.

A buffer spring (70) is positioned between the cam slide (40) and the punch (60). The cushioning spring 70 slightly reduces the speed at which the punch 60 is moved when the punch 60 starts to touch the workpiece so that the pushing force of the cam slide 40 via the punch 60 against the workpiece, To the workpiece is prevented from being directly applied to the workpiece, thereby reducing the possibility that the punch 60 is damaged due to the reaction.

A punch guide tube G1 having a length longer than the length of the cushioning spring 70 and capable of sliding the punch 60 in the inner space is located around the cushioning spring 70, 70 to prevent the moving path of the punch 60, which is joined to the cam slide 40, from deviating from the straight line.

When a hole is formed in the workpiece, the cam driver 30 moves upward together with the upper die 20, and the pressing on the cam slide 40 is released. The return spring 50 serves to return the cam slide 40, from which the cam driver 30 has been released, to the position before it is pressed by the cam driver 30. [

The return spring 50 may be placed in parallel with the second ramp surface 41 in the cam slide 40 as shown in the figure to return the cam slide 40 back to its original position by pushing the cam driver 30 , The cam slide 40 can be returned to its original position by being disposed in a horizontal direction in which the cam slide 40 is slid.

The punch 60 may be surrounded by a protective tube 80, as shown in Fig. The protective pipe 80 is joined to the cam slide 40 through the connecting spring 81 and the cap 82 having the central through hole is provided at an end of the protective pipe 80 in the direction toward the lower die 10.

The protective pipe 80 supports the end portion of the punch 60 formed to be thin and long so that the punch 60 can be punched through the workpiece so as to prevent the punch 60 from being deformed by the pressing force applied to the punch 60, The punch 60 protrudes through the central through hole of the cap 82 after the protective tube 80 and the protective tube 80 contact the surface of the workpiece and the protective tube 80 is held in place by reducing the length of the connecting spring 81 It does not interfere with the piercing process.

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The inner space of the protective pipe 80 should be formed so as not to prevent the punch 60 from moving. The guide pipe G2 is provided around the connection spring 81 so that the moving path of the protective pipe 80 is in a straight line It is preferable to prevent it from escaping.

An elastic plate 83 may be attached to the outer surface of the cap 82.

The elastic plate 83 is made of rubber or silicon and blocks the possibility that the protective pipe 80 touching the surface of the workpiece deforms the workpiece.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. And thus fall within the scope of the present invention.

1: Piercing mold 10: Lower mold
20: upper mold 30: cam driver
31: first slope 40: cam slide
41: second inclined surface 50: return spring
60: punch 70: buffer spring
80: protective tube 81: connecting spring
82: cap 83: elastic plate
G1: Punch guide tube
G2: Guide tube for protection tube

Claims

A piercing mold for piercing a hole in a workpiece,
A lower mold 10 having an upper surface engaging a lower surface of the workpiece and having a workpiece mounted thereon;
A top 20 moving up and down at the top of the lower mold 10;
A cam driver (30) having a first inclined surface (31) formed by chamfering a lower edge of the upper mold (20) in a direction toward the lower mold (10);
And a second inclined surface 41 located below the cam driver 30 and parallel to the first inclined surface 31. The cam driver 30 moves downward to move the second inclined surface 41 toward the cam driver 30, (40) which is horizontally moved so as to be pressed by the first inclined surface (31) of the lower mold (30) so as to be close to the lower mold (10);
A return spring (50) for moving the cam slide (40) in a direction away from the lower mold (10);
A punch 60 protruding from the cam slide 40 toward the lower die 10;
A punch guide tube (G1) provided between the cam slide (40) and the punch (60);
It is possible to prevent the pressing force when the punch 60 starts to touch the workpiece from being directly applied to the workpiece by being positioned inside the punch guide tube G1 and thereby preventing the punch 60 from being damaged A cushion spring 70 for reducing the cushioning force;
A protective tube 80 surrounding a part of the punch guide tube G1 and the punch 60; a cap 82 having a central through hole at one end of the protective tube 80; And
And a connecting spring (81) provided between the cam slide (40) and the other end of the protective pipe (80) for elastically supporting the protective pipe (80).

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The method according to claim 1,
And an elastic plate (83) is attached to the outer surface of the cap (82).