JPH0788567A - Hemming device - Google Patents

Abstract

PURPOSE:To accurately hem in one process and to miniaturize and simplify the device. CONSTITUTION:A moving die 4 to be in contact with a work end part Wa and to bend its periphery is installed at the side of a fixing die 2 to set a work W. The moving die 4 is supported with pivot on a base to attach the fixing die through a spindle 5, and when a ram 6 is lowered, the moving die 4 is made in circular motion to the bending direction of the work end part Wa by being pushed with a push rod 7 hung to the ram 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming device for edge-bending (hemming) an end of a work.

[0002]

2. Description of the Related Art Conventionally, in a hemming device of this type, a slide cam facing the end of a work is generally provided on the side of a fixed mold for setting a work, and a cam driver is installed on an upper ram of the fixed mold. Attach a hemming punch, first slide the slide cam inward through the cam driver when the ram descends to pre-bend the end of the work, and then contact the pre-bent end with the hemming punch from above. The main bending is performed.

However, since this structure has a complicated structure, a hemming device having a simpler structure is used as a practical device.
As seen in Japanese Patent No. 176125, a movable die supported by a parallel link mechanism is provided on a side portion of a fixed die, and the movable die is swiveled in a parallel posture toward a workpiece end to pre-bend the workpiece end. It is also known that the main bending is performed.

[0004]

In the above-mentioned one, since the pre-bending and the main bending can be performed with the same movable die, the structure becomes simpler by that amount, but since the movable die is supported by the parallel link mechanism. However, there is a problem that the movable supporting structure becomes large and complicated by that amount. The present invention has been made in view of the above points, and an object thereof is to provide a hemming device capable of further miniaturizing and simplifying the structure.

[0005]

[Means for Solving the Problems] In order to achieve the above object,
The present invention is a hemming device in which a fixed die for setting a work is provided with a movable die that abuts an end of the work and bends the edge of the work, wherein the movable die bends the end of the work. It is characterized in that the movable mold is pivotally supported on the base on which the fixed mold is mounted so as to make a circular motion in the direction.

[0006]

[Operation] The work end is smoothly pre-bent and main-bent in one step by the movable circular motion with the pivot as the fulcrum.
Since the movable type is only pivotally supported, the supporting structure of the movable type becomes small and simple.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 is a base of a hemming device, and a fixed mold 2 for setting a work W on the base 1.
The bracket 3 is fixed to the side of the bracket 3 and the movable die 4 for bending the end of the work is pivotally supported on the bracket 3 via the pivot 5 at its lower end.

The movable die 4 is formed in an inverted L-shape whose upper portion is bent toward the fixed die 2 side, and a pressurizing portion 4b for contacting the work end Wa is formed at the lower end of the bent portion 4a. did. Further, the movable die 4 is urged to an outward escape position by a spring (not shown), and a ram 6 provided above the fixed die 2 moves up and down to abut on an inclined surface 4c of the upper end of the movable die 4. The rod 7 is vertically installed, and the movable die 4 is rotated inward by the descending of the ram 6 to perform the hemming processing of the work end portion Wa.

The details are as shown in FIG. 2. When the movable die 4 is rotated inwardly, the pressurizing portion 4b moves while changing its posture on a circular arc locus around the pivot 5, and then, as shown in FIG. As shown in (a), the pressing portion 4b abuts on the upper edge of the work end Wa, and the work end Wa is preliminarily bent as shown in FIG. The contact point of the pressurizing portion 4b with respect to the end Wa moves to the bending base end side of the work end Wa, and the work end Wa adheres to the inner plate W'as shown in FIG. 2C. Be bent. In this way, the preliminary bending and the main bending of the work end portion Wa are smoothly performed in one step.

[0010]

As is apparent from the above description, according to the present invention, the hemming process can be favorably performed in one step, and the simplest support structure in which the movable die is pivotally supported is adopted. As a result, the device can be downsized and simplified.

[Brief description of drawings]

FIG. 1 is a front view of an example of the device of the present invention.

2 (a), (b) and (c) are views showing a bending process of a work end portion by the device of the present invention.

[Explanation of symbols]

 1 Base 2 Fixed type 4 Movable type 5 Axis W Work Wa Work end

Claims (1)

[Claims] 1. A hemming device in which a fixed die for setting a work is provided with a movable die which abuts an end of the work and bends the edge of the fixed die, wherein the movable die bends the end of the work. A hemming device characterized in that a movable die is pivotally supported on a base on which a fixed die is mounted so as to make a circular motion in a bending direction via a pivot.