JPH081245A - Bending method for strip - Google Patents

Abstract

PURPOSE:To enable a belt-like metallic sheet to be bent with high precision. CONSTITUTION:A male die 4 is structured by providing an engaging flanges 3, at spaces apart slightly wider than a belt-like metallic sheet 2, on the surface side at both ends of the male die body 1 that is provided with a surface circular- arcuate in the front part; the belt-like metallic sheet 2 is fitted in a groove formed by each engaging flange 3 in the male die 4 and the male die body 1; then, the male die 4 and a female die 5 arranged in parallel with it are moved so as to be relatively close to each other; and finally, bending is performed on the belt-like sheet material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bending a strip-shaped metal plate by bending the strip-shaped metal plate with high precision by press working.

[0002]

2. Description of the Related Art Conventionally, as a method of bending a band-shaped metal plate 8, as shown in FIG. 5, a pair of male-type member 9 and female-type member 10 are moved in a direction in which they are relatively close to each other, The metal plate 8 is bent.

[0003]

In the conventional method described above, when the band-shaped metal plate 8 is bent by moving the male member 9 and the female member 10 in the direction of relatively approaching each other, as shown in FIG. As shown, the width of both end surfaces 11 of the strip-shaped metal plate 8 is inclined so that the male member 9 side is wide, and as shown in FIG. 7, the middle portion of the cross section of the strip-shaped metal plate 8 is the male member 9. It has the drawback of curving by δ so that it dimples inward.

[0004]

In order to advantageously solve the above problems, in the method for bending a strip according to the present invention,
Engaging flanges 3 are provided on the surface sides of both ends of the male body 1 having a front arcuate surface at intervals slightly wider than the band-shaped metal plate 2 to form a male die 4, and each of the male die 4 is formed. The band-shaped metal plate 2 is fitted into the groove formed by the engagement flange 3 and the male body 1, and then the male die 4 and the female die 5 arranged in parallel with the male die 4 are relatively close to each other. Then, the strip-shaped metal plate 2 is bent. Further, the above-mentioned problem can be advantageously solved by applying the hard chrome plating 6 to the contact surface of the belt-shaped metal plate 2 in the engagement flange 3.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show an apparatus and parts for bending a strip-shaped metal plate used for carrying out the present invention. Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 4 show a male body 1 having an arcuate arcuate surface 7 used in an embodiment of the present invention, in which the male body 1 has an arcuate surface having the same radius on the front part thereof. 7 are provided, and engaging flanges 3 are provided at both ends of the male die body 1 to form male dies 4, and the portions of the engaging flange 3 with which the strip-shaped metal plate 2 comes into contact are plated with hard chrome. 6 are integrally provided.

A female die 5 having a V-shaped notch portion 15 is fixed to the supporting base 13 by a plurality of bolts 14 with respect to the supporting base 13, and a male die 4 is attached to the supporting frame 16 in a V-shape in the female die 5. The hydraulic cylinder 17 in the hydraulic jack 20 for pressing and moving toward the notch 15 is provided with the bolt 18
The male die 4 is fixed to the piston rod 21 by a plurality of bolts 19.

A pair of engaging flanges 3 in the male die 4
And the metal mold body 1 between the engaging flanges 3, the metal band 2 is arranged in the groove, and the width of the metal plate 2 interposed by the pair of engaging flanges 3 is: It is fitted in the groove formed by the pair of engagement flanges 3.

In the illustrated embodiment, the engagement flange 3 of the male die 4 holds the strip-shaped metal plate 2 while holding the strip-shaped metal plate 2 while holding the strip-shaped metal plate 2 between the male die 4 and the female die 5. As shown in FIG. 1, high-accuracy bending is performed so that the male die 4 has an arc-shaped cross section.

When the present invention is carried out, if the surface of the engaging flange 3 with which the strip-shaped metal plate 2 comes into contact is plated with hard chrome 6, the sliding property of the strip-shaped metal plate 2 with respect to the male die 4 can be improved. You can Further, the strip-shaped metal plate 2 is arranged in the groove formed by the pair of engagement flanges 3 in the male die 4 and the male die body 1 between the engagement flanges 3, and The width of the intervening strip-shaped metal plate 2 is fitted into the groove formed by the pair of engagement flanges 3, so that the cross-section of the strip-shaped metal plate 2 is prevented from being deformed in an arc shape and the strip shape is formed. It is possible to perform highly accurate bending without disturbing the squareness of the end face of the metal plate 2 in the width direction.

[0010]

According to the present invention, the male flange 1 is provided with the engaging flanges 3 on the surface sides of both ends of the male main body 1 having the front arcuate surface at intervals slightly wider than the strip metal plate 2. 4, and each engagement flange 3 and male body 1 in the male die 4
The strip-shaped metal plate 2 is fitted into the groove formed by and then the male die 4 and the female die 5 arranged in parallel with the male die 4 are moved so as to be relatively close to each other. Since the plate 2 is bent, the deformation of both end faces of the strip-shaped metal plate 2 is prevented from deviating from the right angle, and the cross-section of the strip-shaped metal plate 2 is prevented from being deformed into an arc shape. The plate 2 can be bent with high precision. Also, the engagement flange 3
By applying the hard chrome plating 6 to the contact portion of the strip-shaped metal plate 2 in, the sliding movement of the strip-shaped metal plate 2 can be easily moved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view showing a state where a male die is bent by carrying out the present invention.

FIG. 2 is an enlarged plan view showing a part of an embodiment of the present invention.

FIG. 3 is a perspective view showing a male mold plated with hard chrome used in one embodiment of the present invention.

FIG. 4 is a partially cutaway enlarged vertical side view of the male die plated with hard chrome shown in FIG.

FIG. 5 is a cross-sectional plan view showing a state in which a band-shaped metal plate is bent by a conventional method.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a perspective view showing a strip-shaped metal plate bent by a conventional method.

8 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Male type main body 2 Belt-shaped metal plate 3 Engaging flange 4 Male type 5 Female type 6 Hard chrome plating 7 Arc-shaped surface 11 Both end surfaces 12 Arc-shaped part 13 Support stand 14 Bolt 15 V-shaped notch 16 Support frame 17 Hydraulic pressure Cylinder 18 Bolt 19 Bolt 20 Hydraulic jack 21 Piston rod

Claims (2)

[Claims] 1. A male die 4 is constructed by providing engaging flanges 3 on the surface sides of both ends of a male die body 1 having a front arcuate surface at intervals slightly wider than those of a strip metal plate 2. The band-shaped metal plate 2 is fitted in the groove formed by each engaging flange 3 and the male body 1 in the male die 4, and then the male die 4 and the female die 5 arranged in parallel with the male die 4 are inserted. , A method for bending a strip plate which moves so as to relatively approach each other and bends the strip-shaped metal plate 2. 2. The method for bending a strip plate according to claim 1, wherein the contact surface of the strip-shaped metal plate 2 in the engagement flange 3 is plated with hard chromium.