JPH0679361A - Punching device - Google Patents

Abstract

PURPOSE: To firmly hold a stripper to a punching part owing to superior magnetic effect by disposing a magnetic holder at the end part of the stripper. CONSTITUTION: When punching treatment is executed, a punching part 14 retreats upward. A plate P to be worked is inserted into the prescribed position between the lower part of the punching part 14 and the upper surface of a die 20. The punching part 14 moves downward to penetrate the plate P to be worked and advances into the opening of the die 20, whereas the stripper 24 is compressed between the plate P to be worked and a punch holding part 12 and is expanded outward. Next, when the punching part 14 retreats to the upper position again, the stripper 24 itself restores its initial shape. The stripper 24 will not be separated from the punching device 10 owing to the holding force of a magnetic holder 26 applied to the punch holding part 12. Thus, the stripper is firmly held to the punching part, and also the stripper is relatively manufactured at a low cost because of its simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching device, and more particularly to a punching device having a stripper.

[0002]

2. Description of the Related Art Conventionally, a generally used stripper is composed of a tubular member made of a polymeric elastic material, and is a punch part used for forming a through hole in a metal part in a pressing process. Is joined to. The stripper removes the workpiece from the punch when the punch is pulled out from the workpiece. In such a process,
The stripper is held by the punch section only by the frictional action.

[0003]

However, when operating the stripper as described above, the following problems arise. That is, when the punching device is continuously used, the joining effect only by the friction between the stripper and the punching part itself is weakened and deteriorated. This causes the stripper to disengage from the punch, resulting in accidental damage to the pressure-cutting equipment, and more numerous defective through-hole components until the problem is detected and correct treatment is completed. .

The present invention has been made to solve the above problems, and an object of the present invention is to provide a punching device in which a stripper is firmly held by a punch portion.

[0005]

In order to solve the above-mentioned problems, a punching device of the present invention is a punching device for making a through hole in a workpiece, and is a punch holding device made of a material attracted by a magnet. Part, a long punch part that is held by the punch holding part and projects from the punch holding part, and a stripper for removing the punched work piece from the work piece when the punch part moves away from the work piece. , A magnetic holder disposed at one end of the stripper, the punch holding portion has a surface protruding outward in the radial direction from the punch portion, and the punch portion is processed at a distance from the surface of the punch holding portion. The stripper has an article engaging end, and the stripper is composed of a long tubular member made of a flexible and extensible material that is joined to the punch section. The material has a first end proximate the surface of the punch holder and a second end extending beyond the workpiece engaging end of the punch, and the magnetic holder comprises a punch. A second end of the tubular member disposed on a first end of the tubular member that engages the face of the punch holder for magnetically coupling the tubular member to a punch holder that joins with. The end portion is configured to abut the work piece in a manner of pressing the work piece in each punching step and expand outward in the radial direction to more firmly press the magnetic holder against the surface of the punch holding section. did.

[0006]

With the above construction, the stripper is firmly held by the punch portion by the action of the magnetic holder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the punching device 10
Is composed of a punch holding section 12 and a punch section 14. The punch holder 12 is constructed of iron or steel or other suitable material that attracts magnets. On the other hand, the punch portion 14 is composed of a long cylindrical member having a circular cross section over the entire length thereof, and the cylindrical hole 1 in the punch holding portion 12 is formed.
It is rigidly fixed in 6 using any suitable means.
A part 17 of the punch part 14 projects downward beyond the holding part 12. The back plate 18, which is firmly arranged on the punch holding portion 12, covers the upper part of the cylindrical hole 16. The holding unit 12 moves in a direction parallel to the axis of the punch unit 14 (vertical direction in the accompanying drawings) by a power source (not shown).

The punching section 14 punches (presses) a workpiece such as a metal plate P. In the illustrated example, the metal plate P is supported on the die die 20, and the die die 20 has an opening 22 having a diameter substantially equal to that of the punch portion 14. Metal blob 2 punched from metal plate P
3 drops from the opening 22 of the die die 20.

The stripper 24 is supported by the protruding portion 17 of the punch portion 14. The stripper 24 is preferably a long tubular member made of a polymer elastic material having flexibility, extensibility, and compressibility such as rubber. Both ends of this tubular stripper 24 are preferably cut perpendicular to its longitudinal centerline.
The tubular stripper 24 has an inner diameter equal to or slightly shorter than the diameter of the punch portion 14 in a natural or free state, and is preferably joined to the punch portion 14 with a minute friction grip. In a normal state, the upper end of the tubular stripper 24 abuts the lower surface 25 of the punch holding portion 12, and the lower end of the stripper 24 projects downward slightly beyond the lower end of the punch portion as shown in FIG.

An annular or disk-shaped magnet 26 is disposed on the top of the tubular stripper 24. The magnet 26 has a central opening suitable for penetrating the punch portion, and the magnet 26 itself has a 360 ° circle. It is formed in a flat state over the entire circumference. A concentric recess 28 is formed at the upper end of the stripper 24. Preferably, the recess 28 has a circumferential circumferential wall 30 that is vertically inward in the radial direction,
Further, the recess 28 is arranged radially outward from the inner surface of the stripper 24 in the cylindrical shape. A horizontal upward wall 32 extends from the vertical circumferential wall 30 to the radially outer surface of the stripper 24. Recess 2
The vertical dimension of 8 is preferably equal to the thickness of the magnetic disk 26, and preferably the horizontal dimension of the recess 28 is equal to the difference between the inner and outer diameters of the magnetic disk 26. The magnetic disk 26 is fixed in the recess 28 so as to be concentric with the stripper 24 by using an appropriate means such as an adhesive. In this case, the upper surface of the magnetic disk 26 is flush with the upper end of the stripper 24, and the outer peripheral edge of the magnetic disk 26 is flush with the radially outer surface of the stripper 24.

Considering that the stripper 24 is joined to the projecting portion 17 of the punch section 14 and the upper end of the stripper 24 is in contact with the bottom surface of the punch holding section 12, the upper surface of the magnetic disk 26 is similarly punch-held. It will be appreciated that it is in contact with the bottom surface of section 12. Magnetic disk 2
6 acts as a means for magnetically holding the stripper 24 to the punching device 10 and prevents the stripper 24 from coming off the punching device 10.

When performing the punching process, the punch unit 14
Moves up. Specifically, in the state in which the plate P to be processed is retreated to a position slightly higher than the position shown in FIG.
4 is inserted at a predetermined position between the lower portion and the upper surface of the die die 20. The punch portion 14 drops downward, penetrates the plate P to be processed, and enters the opening of the die die 20. On the other hand, the stripper 24 is compressed between the plate P to be processed and the punch holding portion 12 and expands outward. Next, when the punch section 14 retreats to the upper position shown in FIG. 1, the stripper 24 itself also returns to the shape shown in FIG. Due to the holding force of the magnetic disk 26 with respect to the punch holding portion 12, the stripper 24 does not come off from the punching device 10.

FIG. 2 is a diagram showing another operating state of the punching device shown in FIG. At the position shown in FIG. 2, the outwardly expanded stripper 24 pressurizes the magnetic disk 26 on the outer peripheral surface thereof. Each time the punching device 10 is operated, the pressure due to the outward expansion is further strengthened.
It acts on the second surface 25.

FIG. 3 shows the magnetic disk 2 of FIGS.
6 shows another embodiment in which a magnetic disk 40 is provided instead of No. 6. A structure different from the embodiment shown in FIGS. 1 and 2 will be described. The radial inner end of the magnetic disk 40 is extended, curved inward in the axial direction, and further curved outward in the axial direction. Due to this curved structure, the annular flange 42 is embedded in the constituent members of the stripper 24, and the magnetic disk 4
0 itself is fixed.

FIG. 4 shows the magnetic disk 2 of FIGS.
Instead of No. 6, another embodiment in which a magnetic disk 50 is arranged will be shown. A structure different from the embodiment shown in FIGS. 1 and 2 will be described. The magnetic disk 50 is cut along a line extending radially outward from the inner end in the radial direction, and a plurality of tabs 52 are arranged at an angle. These tabs 52 are curved inward in the axial direction and embedded in the constituent members of the stripper 24 to fix the magnetic disk 50 itself.

In FIGS. 3 and 4, the magnetic disk 4 is shown.
The upper surfaces of 0 and 50 are exposed and are set flush with the upper end surface of the stripper 24. Further, the outer surfaces of the magnetic disks 40 and 50 in the radial direction are also exposed, and are set to be flush with the outer surface of the stripper 24 in the radial direction.

FIG. 5 shows the magnetic disk 5 of FIGS. 1 and 2.
Instead of 0, another embodiment in which a magnetic disk 60 is arranged will be shown. A structure different from the embodiment shown in FIGS. 1 and 2 will be described. A plurality of tabs 62 are arranged at an angle by cutting the magnetic disk 60 from the outer end in the radial direction along a line extending inward in the radial direction. These tabs 62 are curved inward in the axial direction and are embedded in the constituent members of the stripper 24. Magnetic disk 60
Is exposed and is flush with the upper end of the stripper 24. Further, the radially outer surface of the magnetic disk 60 between the plurality of tabs 62 is exposed and is at the same position as the radially outer surface of the stripper 24.

FIG. 6 shows another embodiment of the present invention.
In this embodiment, instead of the magnetic disk in each of the embodiments shown in FIGS. 1 to 5, a magnetic holder made of particulate material 70 is embedded in the upper end area of the stripper 24. Some portions of these particulate materials 70 project from or are sufficiently close to the surface to magnetically attract the punch holder 12 by the upper end of the stripper 24 and the radially outer surface.

[0019]

As described above, according to the present invention, since the magnetic holder is provided at the end of the stripper, the stripper is firmly held by the punch portion due to the excellent magnetic effect. Further, since this stripper has a simple structure, it can be manufactured at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a punching device according to the present invention.

FIG. 2 is a vertical sectional view showing another aspect of the punching device of FIG.

FIG. 3 is a partial cross-sectional view of another punching device according to the present invention.

FIG. 4 is a partial cross-sectional view of yet another punching device according to the present invention.

FIG. 5 is a partial cross-sectional view of yet another punching device according to the present invention.

FIG. 6 is a partial cross-sectional view of yet another punching device according to the present invention.

[Explanation of symbols]

12 punch holding part 14 punch part 24 stripper 25 surface 26, 40, 50, 60 annular disk (magnetic holder) 52, 62 tab (magnetic holder) 70 particulate material (magnetic holder)

Claims (9)

[Claims] 1. A punching device for making a through hole in a workpiece, wherein a punch holding portion made of a material attracted by a magnet, and a length held by the punch holding portion and protruding from the punch holding portion. The punch holding part consists of a long punch part, a stripper for removing the work piece punched out when the punch part leaves the work piece, and a magnetic holder arranged at one end of the stripper. Has a surface projecting outward in the radial direction from the punch section, the punch section has a workpiece engaging end spaced from the surface of the punch holding section, and the stripper has a flexibility for joining to the punch section. And a long tubular member made of a stretchable material, and the tubular member includes a first end portion near the surface of the punch holding portion and the first end portion of the punch portion. A magnetic holder having a second end extending beyond the workpiece engaging end, the magnetic holder magnetically couples the tubular member to a punch holding part that joins the punch part. A second end of the tubular member disposed on a first end of the tubular member that engages a surface abuts the workpiece in a manner that presses the workpiece in each punching step, Further, the punching device is characterized by expanding outward in the radial direction to more firmly press the magnetic holder against the surface of the punch holding portion. 2. The magnetic holder is an annular flat disk concentric with the tubular member of the stripper, and is wholly engaged with the surface of the punch holding portion that projects radially outward from the punch portion. The punching device according to claim 1. 3. A stripper tubular member having a cylindrical inner surface, at a first end thereof being concentric with said tubular member and spaced radially outward from said cylindrical inner surface. The magnetic holder comprises an annular magnetic disk that has an annular recess provided therein and that can be engaged with the surface of the punch holding portion that is disposed in the recess, and the annular magnetic disk is the recess. A punching device according to claim 1, characterized in that it is separated from the punching part by a part of the first end of the tubular member which is present between the tubular inner surface and the cylindrical inner surface. 4. A magnetic disk has an outer surface engageable with a surface of a punch holding portion that projects radially outward from the punch portion, and the outer surface of the magnetic disk is a first end of a tubular member of a stripper. The punching device according to claim 3, wherein the punching device is on the same plane as the section. 5. A magnetic holder is constituted by an annular disk whose inner end in the radial direction is curved axially and inwardly,
The punching device of claim 1, wherein an annular flange is formed that is substantially embedded within the tubular member of the stripper. 6. An annular disc having a radially inner end curved inward in the axial direction and inwardly and continuously curved outward in the radial direction to form a magnetic holder, which is substantially embedded in the tubular member of the stripper. The punching device according to claim 1, wherein a flange is formed. 7. A magnetic holder is constituted by an annular disk whose inner end in the radial direction is curved inward in the axial direction,
The punching device according to claim 1, wherein a plurality of tabs that are embedded at an angle are formed inside the tubular member of the stripper. 8. A magnetic holder is constituted by an annular disk whose outer end in the radial direction is curved inward in the axial direction,
The punching device according to claim 1, wherein a plurality of tabs that are embedded at an angle are formed inside the tubular member of the stripper. 9. The punching device of claim 1, wherein the magnetic holder is a particulate material molded onto the first end of the stripper tubular member.