JPH0663648A - Bending metallic die - Google Patents

Abstract

PURPOSE:To enable surely pinch even when a holding member is eccentric by connecting pinching dies rotatable on a plane paralleling to the pinching direction for a work. CONSTITUTION:In a bending metallic die by which bending is carried out in a state in which a work 1 is pinched by a pinching die 5 connected to a holding member 7, the pinching die 5 is connected to the holding member 7 rotating on a plane paralleling to the pinching direction for the work 1. Therefore, since the work is uniformly pressurized by the pinching die 5 whose pinching center is automatically moved to a position coinciding with the center of the work 1 even when the holding member 7 is eccentric from the center of the work 1, a defective bending caused by an offset load and a generation of flaw on the surface of the work is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work bending die used for three-dimensional bending and other bending work of a work made of aluminum or the like.

[0002]

2. Description of the Related Art Conventionally, metal pipes, plates,
When bending solid materials using a bending die,
A method of bending a work by rotating the roll while tightening the work in a pressing direction with a clamping type on a bending roll is well known.

In the bending die as described above,
The clamping die is connected to a holding member that supports the clamping die, and is driven forward and backward or is driven to rotate. The conventional clamping die is completely connected and integrated with the holding member and is fixed in an immovable state with respect to the holding member. Therefore, there were the following drawbacks.

That is, when the holding member is slightly eccentric with respect to the work, the clamping die is also eccentric, so that the center of the work cannot be securely tightened. In other words, the centering of the work is difficult and the chucking is defective. However, there are drawbacks such as the occurrence of defective bending and scratches on the surface of the work.

The present invention has been made in order to eliminate such a drawback, and the clamping die securely clamps the center of the work even when the holding member supporting the clamping die is eccentric from the center of the work. The purpose of the present invention is to provide a die for bending a work that can be performed.

[0006]

To achieve the above object, the present invention will be described with reference to the reference numerals in the drawings.
In a bending mold for bending while tightening with a tightening die (5) connected to a holding member (7),
A mold for bending a work, wherein the tightening die (5) is rotatably connected to the holding member (7) in a plane parallel to the tightening direction of the work (1). Use as a summary.

[0007]

While rotating the bending rolls (3) and (4) and driving the holding member (7) forward in the direction of the work (1), the side surface of the work (1) is tightened laterally,
The work (1) is bent. When the holding member (7) is eccentric with respect to the work (1), the clamping die (5) rotates with respect to the holding member (7), and as a result, the clamping die (5) moves toward the workpiece. Properly press the center to apply a uniform load.

[0008]

Embodiments of the present invention will now be described with reference to the embodiments shown in FIGS.

In FIG. 1, (1) is a long extruded aluminum work having an inverted L-shaped cross section, (2) is a mandrel inserted in the inner axial direction of the work, (3) is an upper bending roll, and (4) is Is a lower bending roll, and (5) is a clamping die.

The tightening die (5) has a front end surface (5a) which conforms to the side surface shape of the work (1) and has rearward projecting support walls (5b) (5b) at both ends of the rear part. Have Further, a holding member (7) for connecting and supporting the fastening die (5) is arranged in a recess (6) formed between both supporting walls (5b) (5b), and the holding member (7) ) And the support walls (5b) (5b) of the clamp (5)
An axial stop pin (8) is inserted through the hole, and thus the tightening die (5) is tightened in the vertical direction with respect to the holding member (7), in other words, in the tightening direction to the work (1) (see FIGS. (Indicated by arrow A) in a plane parallel to arrow B).

In the bending die shown in FIGS. 1 and 2,
While rotating the upper and lower bending rolls (3) (4),
The work (1) is bent while the holding member (7) is driven forward in the direction of the work (1) to laterally tighten the side surface of the work (1). Thus, as shown by the chain line in FIG. 1, when the holding member (7) is eccentric with respect to the work (1), the clamping die (5) is attached to the holding member (7) as shown in FIG. It rotates counterclockwise, and as a result, the clamping die (5) properly presses the center of the work and does not apply an eccentric load. Thus, even if the hold member (7) is eccentric with respect to the work (1) and the amount of eccentricity changes, the clamping die (5) rotates with respect to the hold member (7) and the center of the work is moved. The workpiece (1) can be surely chucked, and a uniform and appropriate tightening force can always be applied to the workpiece (1).

The shape and structure of the mold are not limited to those shown in the illustrated embodiment. For example, the supporting walls are projected on both sides of the tip of the holding member (7), and the clamping mold is fitted between the supporting walls. The tightening die may be configured to be rotatable so as to be rotatable. Further, the shape of the work (1) is not limited to the illustrated embodiment, and may be a pipe shape. Then, the shape of the tightening work clamping surface may be designed according to the shape of the workpiece.

[0013]

According to the present invention, the tightening die is
Since the holding member is rotatably connected in a plane parallel to the work clamping direction, even if the hold member is eccentric with respect to the work center, the clamping center of the clamping die is the work center. It will automatically rotate to a position that matches. Therefore, since the clamping mold can always press the work uniformly in a proper state, it is possible to prevent the work from being defectively bent and the work surface from being scratched due to an eccentric load, which in turn results in a high-quality bending shape with high accuracy. Bending products can be provided.

[Brief description of drawings]

FIG. 1 is a front partial cross-sectional view showing a schematic configuration of a bending die according to an embodiment of the present invention in a used state.

FIG. 2 is a plan view of a clamping die of the bending die shown in FIG.

[Explanation of symbols]

 1 ... Work 3, 4 ... Bending roll 5 ... Tightening mold 7 ... Hold member

Claims (1)

[Claims] 1. A bending die for bending a work (1) while tightening the work with a tightening die (5) connected to a holding member (7), wherein the tightening die (5) is the holding member. A mold for bending a work, which is rotatably connected to (7) in a plane parallel to the tightening direction of the work (1).