JPH06190454A - Bending device - Google Patents

Abstract

PURPOSE:To perform bending for a small radius especially for a thin material to be formed without causing breaking and outer surface deformation on a work. CONSTITUTION:A roller 3a is arranged on a jig 3 for restraining outer surface deformation which outer surface deformation caused during bending is prevented, an unstably varying friction force is greatly reduced, and accuracy for controlling tensile force is improved in the case of bending by applying a tensile force on a work 1. In addition, if the work 1 is a thin material to be formed, the bending for a small radius is performed without breaking and outer surface deformation because the tensile force against a large friction force is within the breaking load of the work 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus for a profile used for bending a thin profile with a small radius.

[0002]

2. Description of the Related Art A conventional method used for this type of bending will be described with reference to JP-A-59-169629. Conventionally, as shown in FIG. 4, a jig for restraining out-of-plane deformation during bending has a structure in which it slides in contact with a flat surface, and a large frictional force is generated. In particular, when bending is performed by controlling the tension applied to the work in order to prevent out-of-plane deformation such as buckling, there is a problem that the work product buckles due to fluctuations in frictional force. Further, in the case of a thin-walled shape member, there is a problem that the work is broken when a tension is applied to the work against a large frictional force.

[0003]

In the prior art, when the out-of-plane deformation is restrained, the work and the restraining jig have a structure in which they slide in contact with each other on a plane, so that a large frictional force is generated, and The fluctuation of frictional force was also large. Therefore, in the case of a thin-walled shape member, if tension is applied to the work against a large frictional force, the tension exceeds the breaking load, and there is a problem that the work breaks. Further, when bending is performed by controlling the tension applied to the work with high accuracy, the frictional force that changes in an unstable manner is harmful.

Therefore, it is necessary to reduce and equalize the frictional force generated when restraining the out-of-plane deformation.

[0005]

To achieve the above object, the present invention provides a rotatable roller as a jig for restraining out-of-plane deformation in a sliding direction of a work and an out-of-plane deformation restraining jig. To have. That is, the out-of-plane deformation is restrained by the roller, and
The frictional force between the work and the out-of-plane deformation restraint jig is reduced.

[0006]

The function of the bending machine having the above technical means,
A rotary bending machine will be described below as an example.

A work is set in a bending machine equipped with an out-of-plane deformation restraint jig having rollers. The mold set with the work is rotated by a bending machine, and tension is applied to the work to bend the work. Out-of-plane deformation such as buckling that occurs at this time is restrained by this roller. Therefore, the contact area between the work and the roller is small, and the frictional force that fluctuates unstable due to the rotation of the roller is greatly reduced.
Since the high-precision control of the bending process can be easily performed, it is possible to bend the work to a predetermined bending radius without any out-of-plane deformation or breakage.

[0008]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows an embodiment of the present invention and shows a part of a rotary bending machine equipped with the out-of-plane deformation restraint jig of the present invention. Next, a case where the cross-sectional shape of the work is U-shaped will be described as an example. The work 1 is fixed to the rotary mold 2 by the chuck 2a.

The work 1 is bent by rotating the rotary die in this state. At this time, the out-of-plane deformation occurs in the bent portion, so the out-of-plane deformation restraint jig 3 is arranged. The structure of this out-of-plane deformation restraint jig will be described below. The out-of-plane deformation of the work 1 is pushed by pressing the roller 3a of the out-of-plane deformation restraint jig 3 supported by the hydraulic cylinder 4 onto the work 1.
Restricts out-of-plane deformation such as buckling that occurs during bending. On the other hand, when a method of applying a tension to the work in order to prevent buckling, a tension generator (not shown) that grips the other end of the work to generate the tension F is provided.

FIG. 2 is a side view of FIG.

FIG. 3 shows a roller 3b disposed on the side surface of the out-of-plane deformation restraint jig 3 of the embodiment. In this case, the contact area between the work 1 and the out-of-plane deformation restraint jig 3 on the side surface is also reduced, so that the frictional force is further reduced.

FIG. 4 is a side view of FIG.

In this embodiment, the rotary bending process is described, but the present invention can be applied to pull bending, compression bending and the like.

[0015]

According to the present invention, the frictional force between the work of the bending machine and the out-of-plane deformation restraint jig can be greatly reduced and further uniformized. Therefore, when performing bending such that tension is applied to the work, high-precision control can be easily performed, and bending can be performed without out-of-plane deformation. Further, in the case of the thin-walled shape member, the tension against the large frictional force does not exceed the breaking load and the work does not break.

[Brief description of drawings]

FIG. 1 is a front view of a part of a bending machine equipped with an out-of-plane deformation restraint jig showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of a part of a bending machine including an out-of-plane deformation restraint jig according to an embodiment of the present invention.

FIG. 4 is a side view of FIG.

[Explanation of symbols]

1 ... Workpiece, 2 ... Rotating mold, 2a ... Chuck, 3 ... Out-of-plane deformation restraint jig, 3a, 3b ... Roller, 4 ... Hydraulic cylinder.

Claims (1)

[Claims] 1. A bending apparatus having means for restraining out-of-plane deformation that occurs during processing of a work set in a die, wherein the bending machine has an out-of-plane deformation restraint jig provided with rollers. Characteristic bending device.