JPH06142776A - Method for bending extruded material of aluminum - Google Patents

Abstract

PURPOSE:To control wrinkles generated at the time of bending and to obtain satisfactory bending articles by holding the applicable part for bending of the extruded aluminum material to be bent with the use of a tool capable of adjusting positions and thereby performing bending. CONSTITUTION:A die 1 constituting a metallic mold for bending is constituted of a pair of movable dies 1a and 1b, a punch 3 is constituted of a pair of movable punches 3a and 3b, and their positions are each adjusted with bolts or hydraulic cylinders. During the bending, the outside of the vertical wall part 2a, 2b of the extruded material 2 is pressurized by the movable dies 1a, 1b; the inside of the vertical wall part 2a, 2b is pressurized by the movable punches 3a, 3b; the generation of the wrinkles is suppressed by thus forcibly pressing the vertical wall part 2a, 2b; and satisfactory articles are obtained regardless of the variations of sectional dimensions. Consequently, in addition to the stability of quality, the omission of repair work for the wrinkles, the reduction in the number of metallic molds, etc., are made possible.

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 an extruded material made of aluminum or an aluminum alloy material.

[0002]

2. Description of the Related Art Generally, when bending a material having an open and closed cross-sectional shape represented by extruded material of aluminum or aluminum alloy (hereinafter referred to as "aluminum"), wrinkles are wrinkled by using a jig for sandwiching the bending portion. The method of suppressing the occurrence is taken.

FIG. 2 is a view for explaining a bending method using a conventional bending die. In a die 1 having a U-shaped cross section,
FIG. 3 shows an example in which the extruded material 2 having a cross-sectional shape is inserted and the punch 3 is used to bend the longitudinal direction of the extruded material 2. With this mold, the cross-sectional dimensions of the extruded material 2 (2 mm)
Punch width is 75mm, die width is 81mm
Is set to. FIG. 4 shows a state of the extruded material 2 after bending.

[0004]

By the way, the degree of wrinkles occurring in the vertical wall portions 2a and 2b of the extruded material 2 after bending is greatly influenced by the clearance between the material holding jig and the material. That is, if the clearance is large, wrinkles are more likely to occur, and the height of wrinkles is also increased. Therefore, it is necessary to perform the bending process using a jig with a small clearance, but it is virtually impossible to reduce the clearance to zero due to the dimensional accuracy of the extruded material 2, and wrinkles do not occur. It is a difficult situation to prevent completely.

It is an object of the present invention to provide a bending method capable of suppressing wrinkles generated during bending of an extruded aluminum material and obtaining a good bent product.

[0006]

A method of bending an aluminum extruded material according to the present invention comprises bending a corresponding portion of an aluminum extruded material to be bent by using a jig capable of adjusting a position and performing bending. It is characterized by performing.

[0007]

According to the method of the present invention, the position of the jig for sandwiching the bent portion of the extruded material can be adjusted so that the clearance between the jig for extruding the extruded material for bending and the extruded material can be zero. Wrinkles are suppressed by performing bending using a jig that incorporates a mechanism.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view for explaining an embodiment of a bending method according to the present invention, in which a die 1 for forming a bending die is used.
Is composed of a pair of movable dies 1a and 1b, and the punch 3 is composed of a pair of movable dies 3a and 3b.
The position is adjusted by bolts or hydraulic cylinders (not shown), respectively.

During bending, the movable dies 1a and 1b are used.
To push the outside of the vertical wall portions 2a and 2b of the extruded material 2, and to push the inside of the vertical wall portions 2a and 2b by the movable punches 3a and 3b to forcefully push the vertical wall portion 2a, respectively.
By suppressing 2 and 2b, the occurrence of wrinkles is suppressed.

Further, in this embodiment, since the die 1 and the punch 3 are structured so as to be enlarged and reduced, when the extruded material 2 having the above-mentioned shape is bent, the respective dimensions in the reduced state are changed. Punch width is 74 mm, die width is 78
The punch width is set to 78 mm and the die width is set to 82 mm in the enlarged state.

Table 1 below shows vertical wall portions 2a and 2 when three kinds of aluminum extruded material 2 made of 6061-T4 material are bent by the method of the present invention and the conventional method.
It is a table which evaluated the wrinkle generation | occurrence | production state of b. Vertical wall portions 2a, 2
Vertical wall 2a from where b was the same wrinkle occurrence
Only the result of is shown.

[0012]

[Table 1]

As is apparent from this table, according to the method of the present invention, since the vertical wall portions 2a and 2b can be forcibly suppressed during processing, the generation of wrinkles is suppressed and the variation in cross-sectional dimension is concerned. A good processed product can be obtained.

On the other hand, in the conventional method, the die 1 and the punch 3 are affected by variations in the cross-sectional dimensions of the material to be processed.
It can be seen that wrinkles occur because the clearance between and does not become zero, and the height of the wrinkles is almost equal to the amount of clearance. Similar effects can be obtained with materials other than the cross-sectional shape and dimensions according to this embodiment described above, as well as materials with many vertical walls and materials with closed cross-sectional shapes.

[0015]

EFFECTS OF THE INVENTION According to the present invention, in addition to stabilization of quality, wrinkle correction work is omitted, and the number of molds is reduced (even if there is some difference in size, another mold is required in the conventional method). In addition, it is easy to supply and take out the material from the mold, and since there is no friction with the mold at that time, it is possible to mass-produce and to omit maintenance of the mold. It can greatly contribute to the reduction.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a bending method according to the present invention.

FIG. 2 is an explanatory view showing a conventional bending method.

FIG. 3 is a view showing a sectional shape of a bent product.

FIG. 4 is a diagram showing a state of a processed product after bending.

[Simple explanation of symbols]

 1 die 1a, 1b movable die 2 extruded material 2a, 2b vertical wall part 3 punch 3a, 3b movable punch

Claims (1)

[Claims] 1. A method of bending an extruded aluminum material, which comprises bending a corresponding portion of an extruded aluminum material to be bent using a jig whose position can be adjusted to perform bending.