JP2002035822A - Processing apparatus, processing method and processing control method for extruding variable cross section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a variable cross section extruding material extending straight without bending deformation as well as a stable extrusion forming to be executed when the variable cross section extrusion material is obtained by extruding a material and to extend the life of the movable dies, by which the production costs can be reduced as well as to improve the quality of the products. SOLUTION: In the variable cross section extrusion processing apparatus to obtain the variable cross section extrusion material by transferring and converting the movable dies during the extruding process of the material and by transferring an extrusion forming hole formed by a fixed die and single or plural movable dies, the variable cross section extrusion processing apparatus characterized by the features that at least one of the movable dies can be transferred in the slant direction inclined from the extruding direction of the material.

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 extruded material having a cross section perpendicular to the longitudinal direction which is not uniform and varies in the longitudinal direction from an aluminum alloy or the like. The present invention relates to a cross-section extrusion processing apparatus, a variable cross-section extrusion processing method, and a variable cross-section extrusion processing control method.

[0002]

2. Description of the Related Art As is well known, extrusion is a method in which a material (a billet) placed in a container called a container is pressurized, and the material is extruded through a die hole to obtain an extruded shape having a predetermined shape. In one step, an extruded profile product having a relatively complicated cross-sectional shape can be obtained. Especially in recent years,
The problem of recycling has been highlighted, and from this point of view, it is also used as an exterior structural member for transport vehicles that require lighter weight, higher strength, and lower cost for railway vehicles, automobiles, ships, and the like. As structural members of home appliance OA equipment and various mechanical parts that require
The use of extruded aluminum alloy profiles is increasing.

However, most of the structural members described above are used as extruded uniform cross-section members because the cross-sectional shape perpendicular to the longitudinal direction, that is, the so-called cross-sectional shape is not uniform in the longitudinal direction. Instead, some secondary processing is required after extrusion, and complicated secondary forming and welding are sometimes performed. For this reason, the number of processing steps is increased, which is troublesome, and the merit that a product is obtained in one step and the cost performance is good is lost.

[0004] In view of the above, the development of a technique for manufacturing a so-called variable cross-section extruded profile in which the shape of the cross section perpendicular to the longitudinal direction varies non-uniformly in the longitudinal direction has been promoted.

FIG. 13 is a cross-sectional view schematically showing a configuration of a conventional variable cross-section extrusion processing apparatus. In FIG.
Is a material (aluminum billet), 52 is a container, 5
Reference numeral 3 denotes a stem. 54 is a container 52
Are fixedly exchangeably fixed to the end of the
Is a movable die, which slides and moves on the fixed die 54 in a direction perpendicular to the extrusion direction (Z direction) of the material 51 (a direction perpendicular to and intersecting with the material extrusion direction, in this example, the X direction). It has been made possible. 56 is a movable die 5
5 is a cylinder as a driving device;
Is controlled, the movable die 55 is positioned.

FIGS. 14A and 14B are diagrams showing a die hole shape of a die for variable cross-section extrusion, wherein FIG. 14A shows an example of a die hole shape of a fixed die, and FIG. 14B shows a die shape of a movable die. It is a figure which shows an example of a hole shape.

FIG. 15 is a view showing a state of change of an extrusion hole (extrusion cross-sectional shape) formed by the fixed die and the movable die shown in FIG.
(B) shows a state in which the movable die is moved in the X direction indicated by an arrow so that the width of the flat bar becomes the maximum width, and (c) shows a state in which the movable die is further extended by X. (D) shows a state in which the movable die is further moved in the X direction so that the thickness of the flange portion is maximized. (e) shows a state in which the movable die is further moved in the X direction to expand the web width, and (f) shows a state in which the web width is maximized.

[0008] Fig. 15 shows an example of extruding an H-shaped member having no flange formed therein.
As can be seen from FIG. 5, the conventional variable cross-section extrusion processing apparatus moves the movable die 55 in a direction (X direction) orthogonal to the material extrusion direction (Z direction) during the extrusion of the raw material 51, thereby forming a fixed die 54. Die hole (opening)
The extruded hole (extruded cross-sectional shape) formed as an overlapping portion of the movable die 55 and the die hole (opening) of the movable die 55 is changed to obtain an extruded section 50 with variable cross-section.

[0009]

However, in the above-described conventional variable cross-section extrusion processing apparatus, the movable die is moved in a direction perpendicular to the material extrusion direction (in a direction perpendicular to and intersecting with the material extrusion direction). Because
(1) The life of the movable die is short due to the wear of the sliding surface, (2) the extruded profile is liable to bend and need to be reworked such as straightening, and (3) the material flow from the container is unstable. There is a problem that the extrusion molding tends to be inferior in stability.

First, the problem (1) that the life of the movable die is short will be described. In an apparatus in which a replaceable fixed die 54 is provided at the end of the container 52, sealing is performed between the surface of the container 52 and the surface of the fixed die 54 so that the material does not leak during extrusion. In the conventional apparatus for moving the movable die 55 in a direction orthogonal to the material extrusion direction, the movable die 55 is moved by the extrusion pressure acting on the fixed die 54.
It is necessary to prevent the material from leaking during the extrusion process from the gap between the surface of the fixed die 54 and the surface of the movable die 55 due to the displacement in the extrusion direction. Therefore, the movable die 55 is required to simultaneously move in the direction orthogonal to the material pushing direction and maintain the sealing, and the sliding surface of the movable die 55 has an acting force for deforming the material near the die 55. In addition, a considerably large extrusion sealing force S (see FIG. 13) is applied. Therefore, the life of the movable die 55 is shortened due to the wear of the sliding surface, and the production cost is increased.

Next, the problem (2) that the extruded section is apt to bend and deform will be described. As shown in FIG. 13, the bearing section A that finally defines the shape of the variable cross-section extruded section 50 in the fixed die 54 and the variable cross-section extruded section 50 in the movable die 55
As for the bearing portion B which finally defines the shape of the bearing, the bearing portion A of the fixed die 54 and the bearing portion of the movable die 55 on the same plane (XY plane) perpendicular to the material extrusion direction (Z direction). Both part B and B are not located. That is, the positions of the bearing portions A and B do not coincide with each other in the pushing direction (Z direction) and are shifted. For this reason, the variable cross-section extruded shape member 50 is often not straightly extruded but bends in the X direction in FIG. As a result, it is necessary to correct the bending deformation by flowing to a straightening step after extrusion, which leads to an increase in production cost.

Next, the problem (3) that the flow of the material from the container is likely to be unstable and the stability of the extrusion molding is poor will be described. In the so-called direct extrusion in which the material (aluminum billet) 51 in the container 52 is pushed forward by the stem 53, when the movable die 55 is moved in the direction perpendicular to the material extrusion direction during the extrusion, the material in the vicinity of the extrusion hole is extruded. Not only the flow fluctuates, but also the flow of the material 51 fluctuates over a wide range in the container 52. As described above, since the flow of the material 51 in the container 52 is greatly disturbed, the stability of the extrusion molding is inferior, and delicate adjustment control is required.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and when extruding a material such as an aluminum alloy to obtain a variable-section extruded shape, the material is inclined from the material extrusion direction. By moving the movable die in an oblique direction close to the extrusion direction, stable extrusion can be performed and the life of the movable die can be extended, and furthermore, a variable cross section that extends straight without bending deformation It is an object of the present invention to provide a variable cross-section extrusion processing apparatus, a variable cross-section extrusion processing method, and a variable cross-section extrusion processing control method capable of obtaining an extruded profile.

[0014]

In order to achieve the above-mentioned object, the invention according to claim 1 is directed to forming an extrusion hole formed by a fixed die and one or more movable dies during extrusion of a material. By moving and changing the movable die, in a variable cross-section extrusion processing apparatus for obtaining a variable cross-section extruded shape, at least one of the movable dies can be moved in an oblique direction inclined from the material extrusion direction. It is a variable cross-section extrusion processing device.

According to a second aspect of the present invention, when the material is extruded by using the variable cross-section extruding apparatus according to the first aspect to obtain a variable cross-section extruded member, if the movable die is one, the one movable die is used. The movable die, in the case of a plurality, at least one movable die of the plurality of movable dice,
A variable cross-section extrusion processing method characterized by obtaining a variable cross-section extruded shape member by moving the material in an oblique direction inclined from the material extrusion direction during the extrusion of the raw material.

According to a third aspect of the present invention, when a material is extruded by using the variable cross-section extruder according to the first aspect to obtain a variable cross-section extruded shape, (a) a variable cross-section to be extruded in advance From the dimensions and shape of the extruded profile, to determine the initial position of the movable die, and the amount and speed of movement of the movable die necessary to form each cross-sectional shape change portion of the variable cross-section extruded profile, (B) setting the movable die at the initial position and starting extrusion of the raw material; (c) before the end of the extrusion, the shape being extruded is positioned at the start position of the cross-sectional shape change portion. Each time you reach,
Moving the movable die with the moving amount and the moving speed determined in the step (a).
A variable section extrusion processing control method, wherein the variable section extrusion processing is controlled by the step (c).

In the variable cross-section extrusion processing apparatus and the variable cross-section extrusion processing method according to the present invention, when the number of movable dies is plural, for example, two (see FIGS. 7 and 8), two movable dies are extruded during the extrusion of the material. Each of the dies has an inclined direction slightly inclined from the material extrusion direction (Z direction) (for example, as shown in FIG. 6, one movable die has an inclination angle θ = 15 °, and the other movable die has an inclination angle θ = −). (In the direction of 15 °), the extruded hole formed by the fixed die and the two movable dies changes, whereby a variable-section extruded section can be obtained. Further, one of the two movable dies (see FIG. 3) is moved forward and backward in an oblique direction inclined at an inclination angle θ (eg, θ = 15 °) from the pushing direction, and the other movable die (see FIG. 4).
Is moved back and forth in the extrusion direction, the extrusion hole formed by the fixed die and the two movable dies is changed, thereby making it possible to obtain a variable-section extruded profile. Similarly, when the movable die is singular,
By moving the movable die forward and backward in an oblique direction that is inclined from the extrusion direction, an extrusion hole formed by the fixed die and the movable die changes, thereby making it possible to obtain a variable cross-section extruded profile.

As described above, according to the present invention, unlike the prior art, the movable die is moved in an oblique direction close to the material extrusion direction, so that a gap between the movable die and the fixed die may occur. There is no need to apply extrusion sealing force to the movable die. As a result, the degree of wear due to sliding with the fixed die surface during movement of the movable die is greatly reduced, and the life of the movable die can be extended as compared with the related art.

Further, in the present invention, while maintaining a state in which each bearing portion of a plurality of movable dies is located on the same plane (XY plane) orthogonal to the material extrusion direction (Z direction), The movable die can be moved. Accordingly, the extruded section having a variable cross section is extruded straight, and it is possible to suppress the occurrence of bending due to the movement of the movable die.

Further, in the present invention, the movable die is moved in an oblique direction close to the material extrusion direction to change the extrusion hole, so that the inside of the container accompanying the change of the extrusion hole, that is, the movement of the movable die, is changed. The fluctuation of the flow of the raw material is the same as the principle in the case of the indirect extrusion method, and is kept near the extrusion hole. Therefore, even if the movable die is moved during the extrusion, the flow of the material is stable.

In the present invention, the inclination angle θ when the movable die is moved is formed by combining the movement control of the movable die and the inclination angle θ to form a portion where the cross-sectional shape of the extruded section with variable cross-section changes. The movable die is slidably inserted in an oblique direction inclined from the material pushing direction (Z direction) without being particularly limited by the shape of the cross-sectional shape change portion of the profiled product. The tilt angle θ can be freely determined as long as the required tilt angle θ can be formed by the fixed die. However, considering the dimensional shape (height and width for forming the inclination angle θ) of the practically usable fixed die, the inclination angle θ
Is preferably θ ≦ 60 °.

Further, according to the variable cross-section extrusion processing control method of the present invention, when obtaining a variable cross-section extruded profile, the movable die can be appropriately moved corresponding to the cross-sectional shape change portion.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing an entire configuration of a variable cross-section extrusion processing apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an aluminum billet as a material, 2 denotes a container, and 3 denotes a stem. Reference numeral 10 denotes a fixed die, which is fixed to an end of the container 2 by a fixed die holder 4. Reference numeral 11 denotes one of the movable dies described later which is slidably movable in a later-described die hole of the fixed die 10 in an oblique direction inclined from the extrusion direction (Z direction) of the material 1, and 12 denotes a die hole of the fixed die 10. This is another movable die described later, which can be slidably moved in the extruding direction (Z direction) inside the section. Reference numeral 6 denotes a first cylinder as a driving device for moving one movable die 11 via the movable die holder 5A, and reference numeral 7 denotes a second cylinder as a driving device for moving the other movable die 12 via the movable die holder 5B. It is a cylinder.

FIGS. 2A and 2B are views showing the fixed dies in FIG. 1, wherein FIG. 2A is a plan view and FIG.
FIG. 3 is a sectional view taken along line A. FIG. 3 is a view showing one movable die in FIG. 1, wherein FIG. 3 (a) is a plan view and FIG.
FIG. 3 is a sectional view taken along the line BB of FIG. 4A and 4B are views showing the other movable die in FIG. 1, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along the line CC of FIG.

The fixed die 10 and the movable die 11,
Reference numeral 12 denotes an H-shaped member having a variable web width in this example. As shown in FIG. 2, the fixed die 10 has an inclined hole 101 and a vertical hole 102, and both the holes 101 and 102.
And a web forming hole 103 that communicates with the web. The inclined hole 101 and the vertical hole 102 are provided so that the distance between the holes 101 and 102 (the distance in the X direction) gradually decreases toward the container 2 in this example. Hole 101 and vertical hole 10
2 constitutes a tapered hole. That is, X
The vertical section 102 extending in the material extrusion direction (Z direction) with the Y section being rectangular, and the XY section being rectangular,
A pair of inclined surfaces 101a, 101a facing each other in parallel
And an inclined hole 10 extending in an oblique direction inclined at an inclination angle θ (θ = 15 ° in this example) from the material extrusion direction (Z direction).
1 and a web forming hole 103 that connects the two.

Next, the movable dies 11, 12 will be described. One movable die 11, as shown in FIG.
It has a notch 111 for forming a flange web extending in the material extrusion direction (Z direction) having a Y-shaped “inverted T-shape”, and an inclined surface 101 of the fixed die 10.
a, 101a. The one movable die 11 is slidably inserted into the inclined hole 101 of the fixed die 10 and advances and retreats in the inclined hole 101 extending in the oblique direction slightly inclined from the pushing direction (Z direction). It is to be moved.
Further, as shown in FIG.
It has a notched hole 121 for forming a flange and a web having a Y-section that is “inverted T-shaped” and extends in the material extrusion direction (Z direction), and can slide in the vertical hole 102 of the fixed die 10. And is moved forward and backward in the vertical hole 102 extending in the material pushing direction.

As described above, an H-shaped extrusion hole is formed as an overlapping portion of the opening formed by the fixed die 10 and the movable dies 11, 12, and the movable dies 11, 12 are moved forward and backward to form the extrusion hole. The cross section can be made variable, and in the present embodiment, the web width can be made variable.

Next, a method of extruding a variable cross-section extruded material using the variable cross-section extruding apparatus shown in FIG. 1 will be described focusing on the movement of a movable die. FIG. 5 is an example of an extruded section with variable cross section to which the present invention is applied, and is a diagram showing an H-shaped section made of an aluminum alloy formed by changing a web width.

First, the parts (a) and (b) in FIG. 5 will be described. FIG. 1 shows the initial setting positions of the movable dies 11 and 12 at the time of extrusion. One movable die 11 is positioned at the hole exit end of the inclined hole 101 of the fixed die 10 by the first cylinder 6, and The other movable die 12 is fixed by the second cylinder 7 to the fixed die 10.
Is positioned at the hole exit end of the vertical hole 102. Extrusion is started at the movable die position, the set position is maintained for a predetermined period, and the web width is the maximum width W1 and the width is constant as shown in portions (a) and (b) of FIG. Is extruded for a predetermined length.

Next, portions (b) to (c) in FIG. 5 will be described. When the extrusion reaches the portion (b) in FIG. 5, the piston rod of the first cylinder 6 is extended, and the movable die 11 in the inclined hole 101 is moved toward the entrance of the inclined hole 101 at a predetermined speed. To move the movable die 12 in the vertical hole 102 into the vertical hole 10 by extending the piston rod of the second cylinder 7.
(2) Move forward at a predetermined speed toward the side of the entrance. At this time, by controlling the piston rod speeds of the cylinders 6 and 7, the bearing portion of one movable die 11 and the other movable die are placed on the same plane (XY plane) perpendicular to the extrusion direction (Z direction). The movable dies 11 and 12 are moved forward while maintaining the state where the bearing portions 12 are positioned. Then, as shown in FIG. 5C, when the web width becomes W2 (<W1), the movable die 11,
The forward movement of No. 12 is stopped. Thereby, as shown in the portions (b) to (c) in FIG.
The H-shaped portion, which is gradually narrowed from 1 to W2, is extruded for a predetermined length.

Next, portions (c) to (d) in FIG. 5 will be described. Extrusion molding is shown in FIG.
When the forward movement of the movable dies 11 and 12 is stopped after reaching the portion, the extrusion is advanced for a predetermined period while the positions of the movable dies 11 and 12 at this time are held. As a result, as shown in the portions (c) to (d) of FIG. 5, the H-shaped portion having the web width W2 and the constant width is extruded by a predetermined length.

Next, the parts (d) to (e) in FIG. 5 will be described. When the extrusion reaches the portion (d) in FIG. 5, the piston rod of the first cylinder 6 is contracted, and the movable die 11 in the inclined hole 101 is moved toward the exit of the inclined hole 101 at a predetermined speed. While moving backward, the piston rod of the second cylinder 7 is contracted,
The movable die 12 in the vertical hole 102 is moved backward at a predetermined speed toward the exit of the vertical hole 102. At this time, by controlling the piston rod speeds of the cylinders 6 and 7, the bearing portion of one movable die 11 and the other movable die are placed on the same plane (XY plane) perpendicular to the extrusion direction (Z direction). The movable dies 11, 12 are moved backward while maintaining the state where the bearing portions 12 are positioned. Then, as the width of the web gradually increases, and as shown in FIG. 5E, when the web width reaches the maximum width W1 in this example, the retreating of the movable dies 11, 12 is stopped. . This allows
As shown in portions (d) to (e) of FIG. 5, the H-shaped material portion in a state where the width of the web is gradually expanded from W2 to W1 is extruded by a predetermined length.

Finally, (e) to (e) in FIG.
The part (f) will be described. When the extrusion reaches the portion (e) in FIG. 5 and the retreating movement of the movable dies 11, 12 is stopped, the movable dies 11, 12 at this time are stopped.
While the position is held, the extrusion is advanced for a predetermined period, and then the extrusion is completed. Thereby, (e) of FIG.
As shown in the portion (f), the H-shaped material portion having a web width W1 and a constant width is extruded by a predetermined length. In this way, it is possible to obtain an aluminum alloy H-shaped member having a changed web width.

Next, another embodiment of the fixed die and the movable die will be described. FIG. 6 is a view showing another embodiment of the fixed die used in the variable cross-section extrusion processing apparatus according to the present invention, wherein (a) is a plan view and (b) is (a).
3 is a sectional view taken along line AA of FIG. 7A and 7B are diagrams showing one movable die used in combination with the fixed die shown in FIG. 6, wherein FIG. 7A is a plan view and FIG. 7B is a sectional view taken along the line BB of FIG. FIG. 8 is a view showing another movable die used in combination with the fixed die shown in FIG. 6, wherein FIG. 8 (a) is a plan view and FIG. 8 (b) is a sectional view taken along line CC of FIG.

The fixed die 20 and the movable die 21,
Reference numeral 22 denotes an H-shaped member having a variable web width. The difference between the fixed die 10 and the movable dies 11 and 12 is as follows.
The point is that both the movable dies 21 and 22 are moved in an oblique direction that is inclined from the extrusion direction.

First, as shown in FIG. 6, the fixed die 20 is provided with two inclined holes 201 and 202 and a hole 203 for forming a web which connects the two inclined holes. The two inclined holes 201 and 202 are
In this example, the interval (X-direction distance) between the first and second inclined portions 201 and 202 is provided so as to gradually decrease toward the container 2 side, and the two inclined hole portions 201 and 202 form a tapered hole portion. . That is, a pair of inclined surfaces 201a, 201a,
The XY cross-section has a rectangular shape, and is parallel to one inclined hole portion 201 having an upper surface 201a and extending in an oblique direction inclined at an inclination angle θ (θ = 15 ° in this example) from the material extrusion direction (Z direction). The other inclined hole portion 202 having a pair of opposed inclined surfaces 202a and 202a and extending in an oblique direction inclined at an inclination angle -θ (−θ = -15 ° in this example) from the material pushing direction (Z direction). A web forming hole 203 that connects the two is provided.

Next, the movable dies 21 and 22 will be described. As shown in FIG. 7, one movable die 21
It has a notched hole 211 for forming a flange and a web whose Y section has an “inverted T shape” and extends in the material extrusion direction (Z direction), and the inclined surface 201 of the fixed die 20.
a, 201a. The one movable die 21 is slidably inserted into the inclined hole 201 of the fixed die 20 and extends in the oblique direction inclined at an inclination angle θ from the extrusion direction (Z direction). It is designed to move forward and backward within 201. Similarly, as shown in FIG. 8, the other movable die 22 has a notched hole 221 for forming a flange and a web extending in the material pushing direction (Z direction) with an XY cross section having an “inverted T shape”. Together with the fixed die 20
Inclined surfaces 222a corresponding to the inclined surfaces 202a
222. The other movable die 22 is slidably inserted into the inclined hole 202 of the fixed die 20 and extends in the oblique direction inclined at an inclination angle -θ from the extrusion direction (Z direction). The unit 202 is configured to move forward and backward.

According to the variable cross-section extruder having the fixed die 20 and the movable dies 21 and 22 configured as described above, one of the movable dies 21 is inclined from the extrusion direction (Z direction) by an inclination angle θ during the extrusion of the material. (In this example, θ = 15
°) while moving the other movable die 22 in the inclined direction inclined at an inclination angle −θ (−θ = −15 ° in this example) from the extrusion direction (Z direction) while moving the other movable die 22 in an inclined direction. As shown in FIG. 9, it is possible to obtain an aluminum alloy H-shaped member in which the web width is changed symmetrically.

FIG. 10 is a view showing another embodiment of the fixed die used in the variable section extrusion processing apparatus according to the present invention. FIG. 10 (a) is a plan view, and FIG. 10 (b) is a sectional view taken along line AA of FIG. It is. 11A and 11B are diagrams showing a movable die used in combination with the fixed die shown in FIG. 10, wherein FIG. 11A is a plan view and FIG. 11B is a sectional view taken along the line BB of FIG.

The fixed die 30 and the movable die 31
Is an H-shaped member having a variable web width, and is characterized in that one movable die 31 is provided.

First, as shown in FIG. 10, an inclined hole 301 and a flange forming hole 302 are formed in the fixed die 30.
And a web forming hole 303 communicating the two 301 and 302 with each other. Then, the inclined hole portion 301
The hole 302 for forming a flange is formed with the hole 301, 30.
In this example, the interval (X-direction distance) between the two is gradually narrowed toward the container 2 side.
That is, the XY cross section is rectangular, and the material extrusion direction (Z
Direction), a pair of inclined surfaces 301a, 301a facing each other in parallel with each other in a rectangular shape in the XY section, and a tilt angle θ from the material pushing direction (Z direction) (this example). (Θ = 15 °). An inclined hole portion 301 extending in an oblique direction inclined and a web forming hole portion 303 communicating the two are provided.

Next, the movable die 31 will be described.
As shown in FIG. 11, the movable die 31 has a notch hole 311 for forming a flange and a web extending in the material pushing direction (Z direction) with an XY cross section having an “inverted T-shape”. Inclined surfaces 301a, 301a
Have inclined surfaces 312 and 312 corresponding to. The movable die 31 is inserted into the inclined hole portion 301 of the fixed die 30 and has both inclined surfaces 301a, 301a and 312, 31.
Numerals 2 slide in contact with each other, and are moved forward and backward in the inclined hole 301 extending in the oblique direction slightly inclined from the pushing direction (Z direction).

As described above, an H-shaped extruded hole is formed as an overlapping portion of the opening formed by the fixed die 30 and the movable die 31, and the cross section of the extruded hole is made variable by moving the movable die 31 forward and backward. As shown in FIG. 5, it is possible to obtain an aluminum alloy H-shaped member having a changed web width. However, when the movable die 30 is moved forward and backward, unlike the case where there are a plurality of movable dies, the bearing portion of the fixed die 30 is provided on the same plane (XY plane) orthogonal to the extrusion direction (Z direction). And the bearing portion of the movable die 31 cannot be located. For this reason, there is room for improvement in eliminating the occurrence of bending due to the movement of the movable die 31.

Next, how the movable die is controlled when a raw material is extruded by using the variable cross-section extruder shown in FIG. 1 to obtain a variable cross-section extruded member will be described. FIG. 12 is a flowchart for explaining the variable cross-section extrusion processing control method according to the present invention.

First, the initial position of the movable die at the start of the extrusion process and the moving amount and movement of the movable die in each section where the cross-sectional shape changes, based on the dimensions and shapes of the variable-section extruded profile to be extruded in advance. The speed is obtained (step S1). For example, in the example of FIG. 5, the moving amount / movement speed of the movable die in the first cross-sectional shape changing portions (b) to (c) and the second cross-sectional shape changing portion (d) to
The moving amount and moving speed of the movable die in (e) are obtained by calculation. Thereafter, the movable die is set at the initial position (step S2), and the extrusion process is started (step S3). In the example of FIG. 5, when the extrusion process is started, the H-shaped portion having the position (a) as the tip is extruded.

Then, it is determined whether or not the profile being extruded has reached the start position of the cross-sectional shape change portion (step S4). In the example of FIG. 5, it is determined whether or not the start position (b) in the first cross-sectional shape change portions (b) to (c) has been reached. If the start position has not been reached (NO in step S4), the extrusion process is continued without moving the movable die in step S6. If it has reached the start position (YES in step S4),
Proceeding to step S5, the movable die is moved with respect to the portion where the cross-sectional shape is changed by the amount and speed of movement previously determined in step S1. In the example of FIG. 5, when the start position (b) is reached, in step S5, the movable die is moved in advance for the first cross-sectional shape change portions (b) to (c) in step S1. Move by the amount and moving speed. Executing step S5 extrudes the first cross-sectional shape change portions (b) to (c). And
The extrusion process is continued without moving the movable die (step S6), and it is determined in step S7 whether the extrusion process is completed. If the extrusion process is not completed (NO in step S7), step S4 is performed. Will return to. Regarding the end of the extruding process in step S7, the length in the longitudinal direction of the extruded variable-section extruded material being extruded is detected, or the amount of extruded material on the die exit side (shape molding amount) is detected. And the like.

As described above, steps S4 to S
7 is repeated. Therefore, when the shape being extruded reaches the start position of the next cross-sectional shape change portion (YES in step S4), the process proceeds to step S5, and the movable die is moved in advance in step S1 for the next cross-sectional shape change portion. Move with the required amount and speed of movement. FIG.
In the example of the above, when the start position (d) in the second cross-sectional shape changing portions (d) to (e) is reached, in step S5, the movable die is moved to the second cross-sectional shape changing portions (d) to (e).
With regard to (e), the movement is performed by the movement amount and the movement speed obtained in advance in step S1. In this way, every time the profile being extruded reaches the start position of the cross-sectional shape change portion before the end of the extrusion, the movable die is moved to step S
The movement is controlled by the movement amount and the movement speed obtained in advance in step S1.

An apparatus for controlling the movement of the movable die includes a cylinder control unit having a control valve for controlling a cylinder for driving the movable die, a driving of the movable die by the cylinder and a cylinder control unit. And a computer for providing a signal for instructing the movement amount / movement speed. When the computer receives dimensional information of the extruded variable-section extruded section to be extruded, the computer moves and moves the movable die in each section where the cross-sectional shape of the extruded variable-section extruded section changes. Are calculated, and these are stored in the memory.

The fact that the profile being extruded has reached the start position of the section where the cross-sectional shape has changed, that is, the timing of moving the movable die, is determined, for example, by the amount of material extruded on the die exit side (profile molding). Means), and on the other hand, from the dimensional shape information of the variable-section extruded profile to be extruded, the correspondence between the dimension position in the longitudinal direction of the variable-section extruded profile and the profile forming amount is determined. It is obtained in advance and stored in a memory. Then, after the extrusion process is started, the shape material being extruded reaches the start position of the cross-sectional shape change portion based on the shape material forming amount information input from the detection means and the correspondence obtained in advance. That is, it can be recognized that it is time to move the movable die. Or,
The timing for moving the movable die may be known based on the elapsed time from the start of the extrusion processing based on the dimensional shape information of the variable-section extruded profile to be extruded and the extrusion speed.

[0051]

As described above, according to the variable cross section extrusion processing apparatus, variable cross section extrusion processing method and variable cross section extrusion processing control method of the present invention, a material such as an aluminum alloy is extruded to form a variable cross section extrusion material. In order to obtain, unlike the conventional method, the movable die is moved in an oblique direction close to the material extrusion direction, so that stable extrusion can be performed and the life of the movable die can be extended, and furthermore, In the case where the movable die is composed of a plurality of movable dies, it is possible to obtain a variable-section extruded profile that extends straight without bending deformation, thereby reducing the production cost and improving the product quality compared to the conventional one. Can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating an entire configuration of a variable cross-section extrusion processing apparatus according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a fixed die in FIG. 1, wherein FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along line AA of FIG.

3A and 3B are diagrams showing one movable die in FIG. 1, wherein FIG. 3A is a plan view and FIG. 3B is a sectional view taken along the line BB of FIG.

4A and 4B are diagrams showing the other movable die in FIG. 1, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line CC of FIG.

FIG. 5 is a diagram showing an example of a variable-section extruded profile to which the present invention is applied, and an H-shaped profile made of an aluminum alloy obtained by changing a web width.

FIG. 6 is a view showing another embodiment of a fixed die used in the variable section extrusion processing apparatus according to the present invention, and (a) of FIG.
2 is a plan view, and FIG. 2B is a cross-sectional view taken along line AA of FIG.

7A and 7B are diagrams showing one movable die used in combination with the fixed die of FIG. 6, wherein FIG. 7A is a plan view and FIG. 7B is a sectional view taken along the line BB of FIG.

8A and 8B are diagrams showing another movable die used in combination with the fixed die of FIG. 6, wherein FIG. 8A is a plan view and FIG. 8B is a sectional view taken along the line CC of FIG.

FIG. 9 is a view showing an example of a variable cross-section extruded profile to which the present invention is applied, showing a main part of an aluminum alloy H-shaped profile formed by changing the web width symmetrically.

FIG. 10 is a view showing another embodiment of the fixed die used in the variable cross-section extrusion processing apparatus according to the present invention, wherein (a) is a plan view and (b) is a cross-sectional view taken along the line AA of (a).

11A and 11B are diagrams showing a movable die used in combination with the fixed die of FIG. 10, wherein FIG. 11A is a plan view and FIG. 11B is a sectional view taken along the line BB of FIG.

FIG. 12 is a flowchart illustrating a variable cross-section extrusion processing control method according to the present invention.

FIG. 13 is a cross-sectional view schematically showing a configuration of a conventional variable cross-section extrusion processing apparatus.

14A and 14B are diagrams illustrating a die hole shape of a die for variable cross-section extrusion processing, in which FIG. 14A illustrates an example of a die hole shape of a fixed die, and FIG. 14B illustrates a die hole shape of a movable die. It is a figure showing an example of

FIG. 15 is a diagram showing a state of a change in an extrusion hole (extrusion cross-sectional shape) formed by the fixed die and the movable die shown in FIG.

[Explanation of symbols]

1. Material (aluminum billet) 2. Container 3.
... Stem 4 ... Fixed dice holder 5A, 5B ... Movable dice holder 6 ... First cylinder 7 ... Second cylinder 10 ... Fixed dice 101 ... Inclination hole 101a
... Slope surface 102 ... Vertical hole portion 103 ... Web forming hole portion 11 ... Movable die 111 ... Flange / Web forming notch hole portion 112 ... Slope surface 12 ... Movable die 12
DESCRIPTION OF SYMBOLS 1 ... Notch hole part for flange / web formation 20 ... Fixed die 201 ... Sloped hole part 201a ... Sloped surface 202 ... Sloped hole part 202a ... Sloped surface 203 ... Web formation hole part 21 ... Movable die 211 ... Flange / Web formation Notch hole portion 212: inclined surface 22: movable die 221: notch hole portion for forming flange / web 222: inclined surface 30
... fixed die 301 ... inclined hole 301a ... inclined surface
302: Flange forming hole 303: Web forming hole 31: Movable die 311: Flange / Web forming notch hole 312: Inclined surface

Claims (3)

[Claims] 1. A variable cross-section extruded section formed by moving a movable die during extrusion of a material to change an extrusion hole formed by a fixed die and one or more movable dies. A variable section extrusion apparatus, wherein at least one of the movable dies is movable in an oblique direction inclined from a material extrusion direction. 2. When extruding a material by using the variable cross-section extrusion processing apparatus according to claim 1 to obtain a variable cross-section extruded profile, when the number of the movable dies is one, the one movable die is provided with a plurality of the movable dies. In the case of a plurality of movable dies, at least one movable die among the plurality of movable dies is moved in an oblique direction inclined from the material extrusion direction during material extrusion, thereby obtaining a variable cross-section extruded shape. Variable section extrusion processing method. 3. A variable cross-section extrusion process is controlled by the following steps when extruding a raw material using the variable cross-section extrusion processing device according to claim 1 to obtain a variable cross-section extrusion profile. Variable section extrusion processing control method. (A) The initial position of the movable die and the movement of the movable die required to form the respective cross-sectional shape change portions of the variable cross-section extruded profile from the dimensions and shape of the variable cross-section extruded profile to be extruded in advance. Determine the amount and the moving speed. (B) The movable die is set at the initial position, and extrusion of the material is started. (C) Every time the extruded profile reaches the start position of the cross-sectional shape change portion before the end of the extruding process, the movable die is moved to the moving amount and the moving speed determined in the step (a). To move.