JPH08252627A - Die for extrusion of variable cross section and forming method for variable cross section extrusion - Google Patents

Abstract

PURPOSE: To obtain a die for variable cross section extrusion and the extrusion method using it by which construction of travel mechanism and guide mechanism is simplified and various cross section shapes are formed. CONSTITUTION: The die consists of a first die 21 and second die 22 sequentially arranged in the extruding direction, the first die 21 is divided into two blocks 21A, 21B which form a first opening 23 between them and are arranged mutually movable in X direction crossing orthogonally with the extruding direction P. The second die 22 is divided into two blocks 22A, 22B which form a second opening 24 between them and are arranged mutually movable in Y direction crossing orthogonally with the extruding direction P and intersecting with X direction. An extrusion hole 25 is formed with the overlapped part between the first opening 23 formed with the first die 21 and the second opening 24 formed with the second die 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable cross-section extrusion die used for extruding a molded article whose cross-sectional shape changes in the longitudinal direction by using a molding material such as aluminum, and a die for such extrusion. The present invention relates to a variable cross-section extrusion molding method.

[0002]

2. Description of the Related Art A conventional variable cross-section extrusion die of this kind and a variable cross-section extrusion molding method are disclosed in Japanese Patent Laid-Open No. 5-3152.
The one described in Japanese Patent Publication No. 7 is known. FIG. 7 shows a cross section of the extrusion molding apparatus described in the publication. A variable cross-section extrusion die (hereinafter abbreviated as extrusion die) 5 equipped in this extrusion molding apparatus is a first and a second die that are superposed along the extrusion direction P of the molding material 3. It consists of 1 and 2. Here, the first
The first die 2 and the second die 2 each have openings 1A and 2A made of through holes for forming extrusion molding holes, and the first die 1 is arranged on the upstream side in the extrusion direction P. The second die 2 is fixed to the container 6, is arranged on the downstream side of the extrusion direction P, and is slidably arranged in a direction intersecting the extrusion direction P. In this extrusion die, the openings 1A, 2 of the first and second dies 1, 2 are
The overlapping part of A is the extrusion molding hole 4, and both dies 1, 2
The cross-section of the extrusion-molding hole 4 can be changed by relatively moving and changing the overlapping position of the openings 1A and 2A of both dies 1 and 2.

According to the extrusion molding apparatus using the extrusion die 5, the heated billet 3a is inserted into the container 6, and the billet 3a is pushed toward the extrusion die 5 side by the stem 7 to perform extrusion molding. By extruding through the hole 4, a molded product having the cross-sectional shape of the extrusion-molded hole 4 can be obtained. In particular, during the molding, the first and second dies 1 and 2 are relatively moved to change the cross section of the extrusion molding hole 4, so that a molded product having a cross-sectional shape changing in the longitudinal direction can be obtained.

In the example shown in FIG. 7, the opening 1A of the first die 1 and the opening 2A of the second die 2 are both fixedly formed through holes. As shown in FIG. 8 in the publication, the second die 12 side is constituted by two plate-shaped first and second moving dies 12A and 12B having no through holes or the like. Move in the X direction, and move the second moving die 12B to X.
By moving in the Y direction orthogonal to the direction, the shape of the penetrating portion of the first opening 1A is changed, and the extrusion molding hole 1
There is also provided that the cross section of 4 is changed.

[0005]

By the way, when the openings 1A and 2A are formed of fixed through holes as shown in FIG. 7, extrusion molding holes formed at the overlapping portions of the openings 1A and 2A. There is a problem that it is difficult to change the cross-sectional shape of No. 4 in various ways in the vertical and horizontal directions. Also, FIG.
As shown in, one die (second die 12)
When divided into two moving dies 12A and 12B and configured to be movable in the vertical direction (X direction in the drawing) and in the horizontal direction (Y direction in the drawing) respectively, adjustment of the cross-sectional dimension in the vertical direction and the horizontal direction is possible. Since it can be done independently, more diverse cross-sectional shapes can be formed, but since only the second die 12 is divided into a plurality, there is a limit to diversification, and the second die 12 has Within the installation plane, the first and second moving dies 12A and 12B in the vertical and horizontal directions, respectively.
Therefore, there is a problem that the structure of the moving mechanism of the first and second moving dies 12A, 12B and the structure of the guide mechanism therefor are complicated.

The present invention has been made to effectively solve the problems of the above-mentioned conventional variable cross-section extrusion dies, and can simplify the structure of the moving mechanism and the guide mechanism and form various cross-sectional shapes. It is an object of the present invention to provide a variable-section extrusion die that can be used, and a variable-section extrusion molding method using the same.

[0007]

A variable cross-section extrusion die according to a first aspect of the present invention comprises a first die and a second die which are sequentially arranged in the extrusion direction of a molding material, and the first die is , The first die is divided into a plurality of blocks which are provided with a first opening therebetween and are movable relative to each other in a first direction orthogonal to the extrusion direction, and the second die is provided with a second
The first opening formed in the first die is divided into a plurality of blocks that form the openings of the first die and are relatively movable in the second direction orthogonal to the extrusion direction and intersecting the first direction. It is characterized in that the extrusion molding hole is formed at the overlapping portion of the second opening formed in the second die.

In the variable cross-section extrusion die according to the invention of claim 2, the first die is divided into two blocks which open and close the first opening by relatively moving in the first direction,
The second die is divided into two blocks that open and close the second opening by moving relatively in the second direction.

According to a third aspect of the present invention, there is provided a variable cross-section extrusion die in which the first die is composed of two block groups facing each other along the first direction, and each block group is arranged in the first direction. The block includes a plurality of blocks that can be individually moved, and the second die includes two block groups that face each other along the second direction, and each block group individually moves in the second direction. A plurality of possible blocks, a first opening formed between the facing parts of the two block groups of the first die, and a second opening formed between the facing parts of the two block groups of the second die. It is characterized in that an extrusion molding hole is formed at a portion overlapping with the opening.

The invention according to claim 4 is an extrusion molding method using the variable cross-section extrusion die according to any one of claims 1 to 3, wherein a molding material is pressed toward the variable cross-section extrusion die. Meanwhile, by relatively moving the first die and the second die, and performing molding with the molding hole for extrusion,
It is characterized in that a molded product whose cross-sectional shape changes in the longitudinal direction is extruded.

[0011]

According to the first aspect of the present invention, the dimension of the first opening can be changed in the first direction by moving the block forming the first die. Further, by moving the block forming the second die, the size of the second opening can be changed in the second direction. Therefore, it is possible to freely change the cross-sectional dimension of the extrusion molding hole formed at the overlapping portion of the first opening and the second opening in each of the first direction and the second direction.

According to the second aspect of the present invention, the size of the first opening can be changed in the first direction by opening / closing the two blocks forming the first die. Further, the size of the second opening can be changed in the second direction by opening / closing the two blocks forming the second die. Therefore, the cross-sectional dimension of the extrusion molding hole formed at the overlapping portion of the first opening and the second opening is
And the second direction can be freely changed.

Further, according to the invention of claim 3, the size of the first opening can be changed in the first direction by moving each block constituting the block group of the first die. it can. Further, the size of the second opening can be changed in the second direction by moving each block that constitutes the block group of the second die. in this case,
The cross-sectional shapes and dimensions of the first opening and the second opening can be variously changed according to the movement amount of each block. Therefore, the cross-sectional shape and size of the extrusion molding hole formed at the overlapping portion of the first opening and the second opening can be variously changed.

Therefore, according to the invention of claim 4, by using the variable cross-section extrusion die according to any one of claims 1 to 3, the cross-sectional dimension of the extrusion molding hole is changed in one direction or in two directions. While doing so, it becomes possible to easily extrude the constituent members having various cross-sectional shapes in the longitudinal direction.

[0015]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a schematic configuration of a variable cross-section extrusion die (hereinafter, simply referred to as "extrusion die") 20 according to a first embodiment of the present invention. The extrusion die 20 is composed of a combination of a first die 21 and a second die 22 formed of hot tool steel,
The first die 21 and the second die 22 are arranged in order along the extrusion direction P of the molding material so as to be in contact with each other.

The first die 21 is composed of a pair of rectangular plate-shaped blocks 21A and 21B which are arranged to face each other along the X direction (first direction) orthogonal to the extrusion direction P, while the other is the second die. The second die 22 is composed of a pair of rectangular plate-shaped blocks 22A and 22B that are arranged to face each other along the Y direction (second direction) that is orthogonal to the extrusion direction P and orthogonal to the X direction. Here, each block 21A, 21
As B, 22A, and 22B, plate-shaped members having the same shape are used. Both blocks 21A and 21B forming the first die 21 are provided so as to be movable in the X direction, and can be moved by a drive mechanism such as a cylinder (not shown). Also, the second
Both blocks 22A and 22B that make up the die 22 of
It is movably provided in the Y direction and can be moved by a drive mechanism such as a cylinder (not shown). In this case, for example, on the side of the first die 21, X
Guides 27 that guide the blocks 21A and 21B in the direction,
27 is provided, and guides 28, 28 for guiding the blocks 22A, 22B in the Y direction are provided on the side of the second die 22.
Is provided. The guides 27 and 28 arranged in the X direction and the Y direction are simply shown by a chain line in FIG.

In the first die 21, both blocks 21A and 21B are provided so as to be movable in the X direction as described above.
A first opening 23 whose dimension can be adjusted in the X direction is formed between the opposite edges of 1A and 21B. Further, in the second die 22, since both blocks 22A and 22B are provided so as to be movable in the Y direction, the two blocks 2
A second opening 24 whose dimension can be adjusted in the Y direction is formed between the opposite edges of 2A and 22B. Furthermore, the first
The second die 22 and the second die 22 are arranged in a laminated state such that the surfaces facing each other are in contact with each other, and are the overlapping portions of the first opening 23 and the second opening 24 in the intersecting relationship. A rectangular extrusion molding hole (hatched portion) 25 as shown in FIG. 2 is formed.

Next, a method of extruding a constituent member made of aluminum or an aluminum alloy by using the extrusion die 20 having the above-mentioned structure will be described. When extrusion is performed using the extrusion die 20, the extrusion die is set in the same manner as an ordinary die, and the molding material is extruded toward the extrusion hole 25. Then, the extrusion molding hole 25
It is possible to mold and process a structural member having a cross-sectional shape according to the shape. Particularly, in the case of this extrusion die 20, the first die
By moving the blocks 21A and 21B of the die 21 of, the size of the first opening 23 in the X direction (width of the opening 23) can be adjusted, and the block 22 of the second die 22 can be adjusted.
By moving A and 22B, the dimension of the second opening 24 in the Y direction (width of the opening 24) can be adjusted, and by adjusting the dimensions of the openings 23 and 24 of both dies 21 and 22, extrusion can be performed. It is possible to adjust the cross-sectional dimensions of the molding hole 25 in two directions, the X direction and the Y direction. Therefore, by changing the cross-sectional dimension of the extrusion molding hole 25 by moving each block 21A, 21B, 22A, 22B in the middle of molding, for example, a cross-sectional rectangle in which the cross-section MD changes along the extrusion direction P as shown in FIG. The structural member M1 can be molded.

According to the extrusion die 20 of this embodiment,
Since the cross-sectional dimension of the extrusion molding hole 25 can be changed in two directions, the X direction and the Y direction, structural members having various cross-sectional shapes can be extruded. Further, since the first die 21 is composed of the blocks 21A and 21B that move only in the X direction and the second die 22 is composed of the blocks 22A and 22B that move only in the Y direction, it is possible to use two blocks in the same plane. The moving mechanism and the guide mechanism of each block can have a simple structure as compared with the conventional example in which the block has to be moved in the direction. In the above embodiment, each die 2
A pair of blocks 21A, 21B and 2 that form the parts 1 and 22.
Although 2A and 22B are moved together, only one block may be moved and the other block may be fixedly provided.

[0020]

Second Embodiment Next, a second embodiment of the present invention will be described. 4 to 6 show a schematic structure of the extrusion die 40 of the second embodiment. The extrusion die 40 includes a first die 41 and a second die 4 formed of hot tool steel.
4 and FIG. 5, the first die 41 and the second die 42 are arranged in the extrusion direction P of the molding material.
Are arranged in order along and along with each other. The first die 41 has an X direction orthogonal to the extrusion direction P.
Each block group 41A includes a pair of block groups 41A and 41B arranged to face each other in the direction (first direction).
41B is composed of a plurality of (six in this example) rectangular plate-shaped blocks 51 that are individually movable in the X direction. Here, the blocks 51 are arranged in a line in the Y direction orthogonal to the X direction, and can be independently moved in parallel to each other by a driving mechanism such as a cylinder (not shown).

The second die 42 is used in the Y direction (second
A pair of block groups 42 arranged to face each other along the
A, 42B, and each block group 42A, 42B is
It is composed of a plurality of (five in this example) rectangular plate-shaped blocks 52 that are individually movable in the Y direction.
The blocks 52 are arranged in a line in the X direction and can be independently moved in parallel with each other by a driving mechanism such as a cylinder (not shown).

In the first die 41, the blocks 51 constituting the opposing block groups 41A and 41B are provided movably in the X direction as described above, so that the block groups 41A and 41B are A first opening 43 whose dimension can be adjusted in the X direction is formed between the facing portions. Further, in the second die 42, the blocks 52 forming the both block groups 42A and 42B are provided so as to be movable in the Y direction, so that the Y direction is provided between the facing portions of the two block groups 42A and 42B. A second opening 44 whose size can be adjusted is formed. First die 41
The second die 42 and the second die 42 are stacked so as to be in contact with each other, and an extrusion molding hole (hatched portion) 45 having a cross section as shown in FIG. 6 is formed at an overlapping portion of the first opening 43 and the second opening 44. Has been formed.

According to the extrusion die 40 of this embodiment,
Since the number of divided blocks of the first and second dies 41 and 42 is increased, it is possible to create a finer change in sectional shape. Therefore, it is possible not only to change the cross-sectional area in the longitudinal direction into a similar polygon, but also to locally form a concave portion or a convex portion at a desired position on the outer circumference, for example, so that a more diverse cross-section The structural member can be extruded. In the above embodiment, the pair of block groups 41A, 41B, 42A and 42B of the first and second dies 41 and 42, which are arranged to face each other, are respectively 6
The rectangular plate-shaped blocks 51, 52, ... are used, but the number of blocks is not limited to this. A component having a variable cross section in the direction can be easily extruded. In each of the above embodiments, the case where the X direction and the Y direction are orthogonal to each other has been described.
You may make it cross at an angle other than degrees.

[0024]

As described above, according to the inventions of claims 1 to 3, the blocks forming the first die and the second die respectively move in one direction. The cross-sectional dimensions of the extrusion holes can be adjusted in two directions by combining the dies. Therefore, the moving mechanism and the guide mechanism of each die can be made to have a simple structure, and structural materials having various cross-sectional shapes can be molded. Particularly, according to the second aspect of the invention, the first die and the second die are each constituted by two blocks, so that the structure is simple and easy to realize. According to the invention of claim 3, the first die and the second die
Since each die is composed of two block groups and each block group is composed of a plurality of blocks, the cross-sectional shape of the extrusion molding hole can be changed in various ways, and a structural member having a cross section corresponding thereto can be formed. It becomes possible to mold.

Therefore, as in the invention described in claim 4, by molding using the variable cross-section extrusion die according to any one of claims 1 to 3, the cross-sectional shape can be varied in the longitudinal direction. Varying moldings can be extruded using simple-structured extrusion equipment.

[Brief description of drawings]

FIG. 1 is a perspective view of a variable cross-section extrusion die according to a first embodiment of the present invention.

FIG. 2 is a plan view of a variable cross-section extrusion die according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a structural material formed by using the variable cross-section extrusion die according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of a variable cross-section extrusion die according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view showing an operating state of the variable cross-section extrusion die according to the second embodiment of the present invention.

FIG. 6 is a plan view of the state shown in FIG. 5 seen from above.

FIG. 7 is a side sectional view of an extrusion molding apparatus equipped with a conventional variable cross-section extrusion die.

FIG. 8 is a front view of another conventional variable cross-section extrusion die.

[Explanation of symbols]

 20 Variable Section Extrusion Die 21 First Die 21A, 21B Block 22 Second Die 22A, 22B Block 23 First Opening 24 Second Opening 25 Extrusion Molding Hole 40 Variable Section Extrusion Die 41 First Die 41A , 41B Block group 42 Second die 42A, 42B Block group 43 First opening 44 Second opening 45 Extrusion molding hole 51, 52 Block X First direction Y Second direction P Extrusion direction

Claims (4)

[Claims] 1. A first device, which is sequentially arranged in a direction of extruding a molding material.
And a second die, wherein the first die forms a first opening between them and is divided into a plurality of blocks that are relatively movable in a first direction orthogonal to the extrusion direction. The second die is divided into a plurality of second dies that form second openings between them and that are relatively movable in a second direction orthogonal to the extrusion direction and intersecting the first direction. A variable cross-section extrusion characterized by being divided into blocks and forming an extrusion molding hole at an overlapping portion of a first opening formed in the first die and a second opening formed in the second die. For dice. 2. The first die is divided into two blocks that open and close the first opening by relatively moving in the first direction, and the second die has the second direction. 2. The variable cross-section extrusion die according to claim 1, wherein the variable cross-section extrusion die is divided into two blocks that open and close the second opening by moving relative to each other. 3. The first die comprises two block groups facing each other along the first direction, and each block group comprises a plurality of blocks individually movable in the first direction. The second die is composed of two block groups facing each other along the second direction, and each block group includes a plurality of blocks individually movable in the second direction, Overlap of the first opening formed between the facing portions of the two block groups of the first die and the second opening formed between the facing portions of the two block groups of the second die. The variable cross-section extrusion die according to claim 1, wherein the extrusion molding hole is formed in a portion. 4. An extrusion molding method using the variable cross-section extrusion die according to claim 1, wherein the first material is pressed against the variable cross-section extrusion die while pressing the molding material. Of the die or at least one of the second die is moved to perform molding in the molding hole for extrusion, thereby extruding a molded product whose cross-sectional shape changes in the longitudinal direction. A variable cross-section extrusion molding method.