JP2631813B2 - Upper die unit and punch for V-shaped bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper die device for a V-shaped bending machine for bending a metal plate to be processed into a V-shaped cross section, and more particularly to a V-shaped bending machine. And a punch used for the same.

[0002]

2. Description of the Related Art Conventionally, an upper mold device for this type of processing machine usually includes a punch having a V-shaped cross section and a holder on which the punch is mounted with the mold face downward. Was formed by grinding a steel plate.

[0003]

By the way, the punch of this type of apparatus differs depending on the type, thickness, size, production amount and the like of the plate material to be processed, but usually requires high hardness and wear resistance, for example. You. Therefore, in the case of a conventional example in which a hard steel plate such as a carbon tool steel is obtained by grinding to obtain a punch, this type of processing takes time and labor, so that it is usually avoided that the price of the punch is high. Did not. As a result, in the case of the conventional device, there is a disadvantage that the price of the punch is high and the device itself is expensive. Conventionally, in the case of this type of apparatus, it is usually necessary to replace the punch with a new one in accordance with the life of the punch. However, since the punch is expensive as described above in the conventional product, the maintenance There was a problem that the above cost (running cost) would be high.

[0004] The present invention is to solve such a problem of the conventional product. Therefore, the technical problem of the present invention is to reduce the cost of the punch, the upper die device for the V-shaped bending machine formed so that the device itself and the running cost can be reduced, and the device for this type of device formed so as to be inexpensive. To provide a punch.

[0005]

The present invention employs the following technical means to solve the above-mentioned problems. That is, the present invention provides a punch 1 having a mold surface 1a formed in a V-shaped cross section,
In an upper die apparatus for a V-shaped bending machine having a holder 2 to which the punch 1 is attached with the die surface 1a facing downward, the punch 1 is obtained by dividing the pipe steel material along its longitudinal direction. The punch 1 is made of a member having a curved cross section.
Concave along the longitudinal direction of the punch 1 at the lower portion of the convex curved surface 1b.
A step-shaped relief portion 1c is formed, and the punch 1 is attached to the holder 2 in a vertical state.

In this case, in the present invention, it is preferable that the holder 2 is formed with a concave curved surface 2c which engages with the convex curved surface 1b of the punch 1. In this case, the punch 1
Of the punch 1 can be easily received by the holder 2 and the set of the punch 1 can be prevented.

[0007] Also as a punch 1 for use in the present invention, Ri such a cross-sectional curved member obtained by cutting along the tube steel in the longitudinal direction, in the lower part of the convex curved surface 1b along the longitudinal direction concave
In some cases, a step-shaped relief portion 1c is formed . In this case, the number of divisions of the pipe steel material is arbitrary. Further, the pipe steel material may be separated from the axis center thereof. Although the pipe steel material depends on the type of steel, in the case of carbon steel for machine structure, etc., it is preferable to harden the entire surface after cutting and to perform a surface hardening treatment.

[0008]

According to the present invention, the workpiece 4 is bent into a V-shape by the punch 1 formed of a member having a curved cross section. When the life of the punch 1 has expired, it is removed from the holder 2 and replaced with a new one. Since a plurality of punches 1 can be obtained from one pipe steel material, in the present invention, the punch 1 itself is inexpensive, and the running cost of the apparatus can be reduced accordingly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. Reference numeral 1 denotes a punch whose mold surface 1a has a V-shaped cross section. As shown in FIG. 3, the punch 1 is a curved member having a cross section obtained by dividing a tube steel material into three equal parts along its longitudinal direction, in this embodiment, at intervals of 120 degrees around an axis. Become. In this case, as the pipe steel material, for example, carbon tool steel (steel type JIS, SK4, etc.) is preferable, and it is preferable to harden the entire surface of the pipe steel material after cutting.

Reference numeral 2 denotes a holder for mounting the punch 1 in a vertical state. In this case, as shown in FIG. 2, the punch 1 is fixed to the holder 2 with, for example, a screw 3 having a hexagonal hole. Reference numeral 2a denotes a concave hole formed on the side surface of the holder 2, and the screw 3 is screwed to the punch 1 with its head housed in the concave hole 2a.

Reference numeral 2b denotes a protruding portion for attaching the holder 2 to a drive unit for the upper die device for moving the upper die device up and down. W (see FIG. 2) indicates the bending load. In the case of this embodiment, the punch 1 is attached to the holder 2 such that the vertical line connecting the corner A of the mold surface 1a and the upper corner B is the same as the vertical line at the center of the protrusion 2b. I have.

In general, a plurality of holders 2 are provided in accordance with the length of the punch 1, and the punches 1 are held by the holder 2 at regular intervals. The holder 2 has a concave curved surface 2c that engages with the convex curved surface 1b of the punch 1. Reference numeral 1c denotes a relief portion for preventing the workpiece 4 from hitting the convexly curved surface 1b during pressurization. The relief portion 1c is formed in a concave step shape below the convex curved surface 1b along the longitudinal direction of the punch 1. 5 is a die.

Next, the operation of this embodiment will be described. First, the punch 1 moves down together with the holder 2. As a result, as shown in FIG. 4, the mold surface 1a of the punch 1 bends the workpiece 4 into a V-shape. In this case, in this embodiment, as described above,
Since the punch 1 is attached to the holder 2 so that the vertical line connecting the corner A of the mold surface 1a and the upper corner B is the same as the vertical line at the center of the protrusion 2b of the holder 2, bending is performed. The entire load W is directly applied to the mold surface 1a without being dispersed, and the workpiece 4 is bent in a V-shape. The holder 2 is formed with a concave curved surface 2c which engages with the convex curved surface 1b of the punch 1.
Is caused by the holder 2 without difficulty.

In the above process, according to the present invention, the punch 1 described above may be formed by cutting a pipe steel material. Therefore, as shown in FIG. 5, for example, the dividing angle may be a value obtained by dividing the axis into 90 degrees by 90 degrees, and is arbitrary. Further, as shown in FIG. 6, the punch 1 may be obtained by cutting a cutting line L at a position shifted from the axial center so that the angle a of the mold surface 1a can be changed, and dividing at this position. The pipe steel material is
It is preferable to perform a surface hardening treatment such as quenching after dividing,
Of course, depending on the selection of the steel type, such a treatment need not be particularly performed.

In the present invention, the groove shape of the die 5 is arbitrary, and depending on the selection of the die 5, as shown in FIG. 7, the workpiece 4 having the curved portion 4a along the convex curved surface 1b of the punch 1 is formed. Is obtained. Further, in the case of the present invention, the holder 2 is preferably formed with the concave curved surface 2c, but is not limited to this, and any shape can be used as long as it can hold the punch 1.

[0016]

As described above, according to the present invention, the punch is a member having a curved cross section obtained by dividing the pipe steel material along the longitudinal direction, and the punch is provided below the convex curved surface of the punch.
A concave step-shaped relief portion is formed along the longitudinal direction of the punch , and this punch is attached to the holder in a vertical state. Therefore, in the present invention, the work piece does not hit the convex curved surface at the time of pressurization by dividing the pipe steel material along the longitudinal direction and forming the relief portion below the convex curved surface.
Since a punch can be obtained and a plurality of punches can be obtained from one tube of steel, the manufacturing cost of the punch can be reduced accordingly, the apparatus itself can be reduced in cost, and the running cost can be reduced. An excellent effect that it can be achieved.

Further, when formed as described in claim 2,
Since the outward bending generated on the convex curved surface of the punch at the time of pressurization can be supported without difficulty by the holder, the setting of the punch can be prevented, and the durability can be improved.

Further, in the case of the punch according to the present invention, the pipe steel material is divided along its longitudinal direction to form a convex curved surface.
The lower portion can be formed by processing a concave step-shaped relief portion along the longitudinal direction, and a plurality of recesses can be obtained from one pipe steel material, so that a punch can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred example of the present invention.

FIG. 2 is a sectional view of the present invention in a use state.

FIG. 3 is a perspective view showing an example of a cut state of a pipe steel material.

FIG. 4 is an enlarged sectional view of a main part for explaining the operation of the present invention.

FIG. 5 is a cross-sectional view showing another example of a cut state of a pipe steel material.

FIG. 6 is a cross-sectional view showing still another example of a cut state of a pipe steel material.

FIG. 7 is an enlarged sectional view of a main part showing another example of a bending state.

[Explanation of symbols]

 Reference Signs List 1 punch 1a mold surface 1b convex curved surface 2 holder 2b projecting portion 2c concave curved surface W load

Claims (3)

(57) [Claims] 1. An upper die apparatus for a V-shaped bending machine, comprising: a punch having a die surface formed in a V-shaped cross section; and a holder on which the punch is mounted with the die surface facing downward. There will in cross section curved member obtained by cutting along the tube steel in the longitudinal direction, the convex Bay punch
A concave step-shaped relief along the longitudinal direction of the punch at the bottom of the curved surface
An upper die device for a V-shaped bending machine, wherein a part is formed, and the punch is attached to the holder in a vertical state. 2. The upper die device for a V-shaped bending machine according to claim 1, wherein the holder is formed with a concave curved surface which engages with the convex curved surface of the punch. 3. A tube Ri steel material cross-sectional curved member obtained by cutting along the longitudinal direction of the longitudinal bottom of the convex curved surface
3. A punch used in an upper die device for a V-shaped bending machine according to claim 1, wherein a concave step-shaped relief portion is formed along the direction .