JP2002248518A - Method, apparatus and control method for extrusion forming of twisted section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a twisted section in excellent dimensional accuracy as well as one intermittently twisted in its longitudinal direction, or one twisted in an uneven pitch rather than an even pitch. SOLUTION: A forming die apparatus is comprised of a stationary guiding die which is fixed to an opening at an exit side of a container for raw material, in a ring shape, having a spiral guide on the inside surface, and a movable die which has an extrusion forming hole and is inserted movably along the spiral guide into the stationary guiding die. The extrusion forming method of twisted section is characterized in that it pressurizes material contained in the container to force it out from the extrusion forming hole of the movable die, moving the movable die along the spiral guide to give the movable die a screwing motion, and then extrusion-forms the twisted section whose phase in a cross section perpendicular to the longitudinal direction of the twisted section varies along the longitudinal direction of the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsion-shaped material which is made of aluminum alloy or the like, and whose phase (the appearance of the cross section) of a cross section perpendicular to the shape material longitudinal direction changes along the shape material longitudinal direction. The present invention relates to a method for extruding a torsional section, an apparatus for extruding a torsional section, and a method for controlling the extruding of a torsional section, which are used in (1).

[0002]

2. Description of the Related Art As is well known, extrusion molding 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 material having a predetermined shape. In one step, an extruded profile product having a relatively complicated cross-sectional shape can be obtained. In particular, in recent years, environmental and recycling problems have been highlighted, and from this point of view, as exterior structural members of transport vehicles that require lighter weight, higher strength and lower cost of railway vehicles, automobiles, ships, etc. Extruded aluminum alloys are increasingly used as structural members for home appliances OA equipment and various mechanical parts that require weight reduction, high strength, and low cost.

[0003] In view of the above, in order to take advantage of the advantage of extrusion molding that a product can be obtained in a single step as described above and the cost performance is good, the phase of the cross-sectional shape perpendicular to the longitudinal direction of the profile has been conventionally used. Techniques have been proposed for extruding torsional profiles that vary along the longitudinal direction.

[0004] For example, Japanese Patent Application Laid-Open No. 5-329532 discloses a die apparatus used for extruding a hollow torsion-shaped material having helical and continuous spirals along the longitudinal direction of the shape. Have been. The dice device disclosed in this publication is a female die for forming a cross section of a solid portion of a hollow torsion profile, and a cross section of a hollow portion of the hollow torsion profile is located upstream of the female die. And a male die to be formed, and the male die is mounted on a front end opening of a container in which the material is stored. And
In the die hole of the female die, a plurality of twisted portions (twisted portions) for defining the twisted shape of the hollow torsion-shaped material to be extruded are formed with a predetermined twist angle.
In addition, Japanese Patent Publication No. 6-79739 discloses a die device for obtaining a hollow torsion profile (see FIG. 10) having an irregular portion on the outer periphery spirally and continuously along the profile longitudinal direction. I have. The dice device disclosed in this publication is a female die having a die hole having a cross-sectional shape and a torsion angle corresponding to the concave-convex shape of the hollow torsion member (die female die).
And a direction in the torsion direction is applied to the metal flow of the raw material (extruded material) around the formed convex portion for forming the hollow portion of the hollow torsion profile, and the metal flow is guided to the die hole of the female die. And a male die having an extrusion material introduction hole (die male type).

[0005] As described above, in obtaining a torsion profile (in this case, a hollow torsion profile) in which the phase of the cross-sectional shape changes along the longitudinal direction of the profile, the former Japanese Patent Application Laid-Open No. 5-329532 discloses a male. There is disclosed a die device including a die and a female die having a die hole in which a twist portion for imparting a twist to a material is formed. Also, Japanese Patent Publication No. Hei 6-79739 discloses that the extruded material introduction hole of the male die and the die hole of the female die are communicated with each other so that the material is formed from the male die inlet toward the female die outlet. There is disclosed a dice device having a structure in which a material passage hole extending obliquely to a longitudinal direction is formed to impart a twist to a material.

[0006]

However, the above-mentioned Japanese Patent Application Laid-Open
The conventional die apparatus for extruding a torsion-shaped material disclosed in Japanese Unexamined Patent Publication No. 329532 and Japanese Patent Publication No. 6-79739 has a problem in terms of shape accuracy and the like.

That is, in the conventional die apparatus, a twisted portion is provided in a die hole of a female die, or a material passage extending obliquely from a male die inlet to a female die outlet with respect to a longitudinal direction of a profile. By providing holes, the material in the die is given a flow in an oblique direction that forms an angle (twist angle) with respect to the longitudinal direction of the profile,
The torsional profile is formed by the inertial force of the material extruded from the female die while being given the flow in the oblique direction, and the restraining force due to the continuity of the material.

For this reason, in the conventional die apparatus, even when a die having a certain torsion angle is used, the torsion angle of the torsion profile obtained by increasing the extrusion speed and increasing the flow of the material is small. Conversely, if the extrusion speed is reduced and the flow of the material is slowed, the torsion angle of the torsion profile obtained tends to increase, and the torsion profile having the same size as the die hole of the female die is used. It was difficult to get.

Further, in the conventional die apparatus, the torsion is applied continuously in the longitudinal direction of the profile and the torsion profile is formed with the torsion at an equal pitch, and is not continuous in the longitudinal direction of the profile. A torsional profile with intermittent torsion, or a torsional shape in which the torsion is not equal pitch (cross-section phase change is constant) but non-equal pitch (cross-section phase change is not constant) I can not get the material.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the phase of a cross section perpendicular to the longitudinal direction of the profile along the longitudinal direction of the profile is made of aluminum alloy or the like. In obtaining a torsional profile that changes, it is possible to obtain a torsional profile with good shape accuracy.In addition, torsional profiles with intermittent torsional rather than continuous in the longitudinal direction of the profile or torsional at equal pitch It is an object of the present invention to provide a method for extruding a torsion-shaped material, a device for extruding a torsion-shaped material, and a method for controlling the extrusion of a torsion-shaped material, which can obtain a torsionally shaped material having a non-equal pitch.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 is mounted and fixed to a front end opening of a container in which a material is stored, and has a ring shape, and an inner peripheral surface thereof. A guide die having a spiral guide portion, and a movable die having an extrusion hole and being movably inserted into the guide fixed die along the spiral guide portion. By moving the movable die along the spiral guide portion while pressing and extruding the material stored in the container from the extrusion forming hole of the movable die, the movable die is translated and rotated. Characterized by extruding a torsional profile in which the phase of the cross section perpendicular to the longitudinal direction of the profile changes along the longitudinal direction of the profile by simultaneously performing a screw motion. It is the law.

According to a second aspect of the present invention, there is provided a container in which a material is stored, a material pressing means for pressing the material in the container toward the front end side of the container, and a ring mounted and fixed to the opening at the front end of the container. None, a guide fixing die having a spiral guide portion on the inner peripheral surface thereof, and an extrusion hole through which the material pressed by the material pressing means is extruded, and the spiral guide is provided in the guide fixing die. A dice device comprising a movable die movably inserted along a portion, and a screw motion for simultaneously performing a translational motion and a rotary motion of the movable die by moving the movable die along the spiral guide portion. A movable die driving means for controlling movement of the movable die by the movable die driving means, and a cutting device perpendicular to the longitudinal direction of the profile along the longitudinal direction of the profile. A profile extrusion molding apparatus torsion, characterized in that the extruded torsion profile phase changes.

According to a third aspect of the present invention, there is provided a method for extruding a material by using the apparatus for extruding a torsional member according to the second aspect to obtain a torsional member. Determining the initial position of the movable die and the amount and speed of movement of the movable die required to form each torsional portion of the torsion profile from the dimensions and shape of the movable die; Is set to the initial position, and the extrusion of the material is started. (C) The movable die is moved every time the shape being extruded reaches the start position of the torsion portion before the end of the extrusion. The above (a)
Controlling the extrusion processing in the steps (a) to (c) of performing the screw movement with the movement amount and the movement speed determined in the step (b). It is.

According to the present invention, there is provided a guide fixing die which is attached to and fixed to the front end opening of a container in which a material is stored, has an annular shape and has a spiral guide portion on an inner peripheral surface thereof, It has an extrusion molding hole through which the material passes, and has a die device consisting of a movable die movably inserted along the spiral guide portion in the guide fixed die, so that it is stored in a container. By moving the movable die along the spiral guide portion of the fixed die for guiding while pressing the material pressed and extruding from the extrusion forming hole of the movable die, the movable die is moved along the central axis of the movable die extending in the longitudinal direction of the profile. It is possible to perform a screw motion that simultaneously performs a translational motion along the axis and a rotary motion about the center axis of the movable die. This makes it possible to form a twisted material without extruding the material from the extrusion molding hole of the movable die in a direction oblique to the longitudinal direction of the material (the central axis of the movable die), unlike the conventional method. In addition, a torsional shape member having good shape accuracy can be obtained.

Further, by twisting the movable die intermittently, it is possible to obtain a torsion-shaped member to which a twist is applied not intermittently but intermittently in the longitudinal direction of the shape.
Further, by changing the moving speed of the movable die to be not constant, it is possible to obtain a torsion profile in which the twist is not equal pitch but non-equal pitch.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing the entire configuration of a torsional member extrusion molding apparatus according to one embodiment of the present invention.

As shown in FIG. 1, the torsion profile extrusion molding apparatus comprises a container 1 in which a heated aluminum alloy billet A as a raw material is stored, and a stem (ram) 2 in which the aluminum alloy billet in the container 1 is provided. Extrusion cylinder that presses A to the container tip side (material pressing means)
3, a guide fixing die 4 having an annular shape and having a spiral guide groove 4a as a spiral guide portion on its inner peripheral surface, which is fixed by being mounted on the opening at the tip end of the container 1. An extrusion molding hole 5b through which the aluminum alloy billet A pressed by the stem 2 is extruded;
A movable die 5 is inserted into the guide fixed die 4 so as to be able to advance and retreat along the spiral guide groove 4a. The fixed die 4 for guide and the movable die 5 constitute a dice device. Further, the torsion profile extrusion molding apparatus moves the movable die 5 along the spiral guide groove 4a, thereby moving the movable die 5 along a central axis of the movable die extending in the longitudinal direction of the profile (reciprocating motion). ) And a movable die driving means including a first screw moving member 7, a second screw moving member 8, and cylinders 9, 9 for performing a screw motion for simultaneously performing a rotary motion about the movable die center axis. And a control device 10 for controlling the movement of the movable die 5 by the movable die driving means.

The guide fixed die 4 and the movable die 5 will be described. FIG. 2 is a plan view showing a guide fixing die of the dice device according to the present invention, FIG. 3 is a perspective view showing the guide fixing die when cut along the line AA in FIG. 2 and viewed from the arrow direction, and FIG. FIG. 5 is a plan view showing the movable dice of the dice device according to the invention, and FIG. 5 is a perspective view showing the movable dice when cut along the line AA in FIG. 4 and viewed from the direction of the arrow.

The guide fixing die 4 fixed to the front end opening of the container 1 by the holder 6 has an annular shape as shown in FIG. 2 and FIG. Spiral guide groove 4 for guiding the movable die 5 fitted in the fixed die 4 for screw movement.
a is formed. In this example, the spiral guide groove 4a
Has a narrow, spirally extending recess.

As shown in FIGS. 4 and 5, the movable die 5 inserted into the fixed guide die 4 is in contact with the inner peripheral surface of the fixed guide die 4 and is slidable on the outer peripheral surface. In the present example, there is an extruded hole 5b for an H-shaped section in this example. The surface of the movable die 5 forming (defining) the extrusion molding hole 5b extends straight in the material extrusion direction (the longitudinal direction of the profile) without being inclined. At a predetermined position on the circular outer peripheral surface of the movable die 5, a protrusion that is fitted into a part of the spiral guide groove 4 a of the guide fixed die 4 and is slidable along the spiral guide groove 4 a. 5a are formed.

Next, the movable die driving means will be described. FIG. 6 is a sectional view for explaining the movable die driving means according to the present invention, and FIG. 7 is a perspective view showing the first screw motion member in FIG. As shown in FIG. 7, a first screw motion member 7 constituting a movable die driving means for screwing the movable die 5 includes a cylindrical body 71 having a diameter substantially the same as that of the movable die 5, An annular flange portion 72 fixed to the lower circumferential end of the body 71 is provided. A small ball 72a is rotatably mounted on each of a front surface and a back surface of the flange 72 in a plurality of pockets provided at predetermined intervals on a plurality of concentric circles concentric with the cylindrical body 71.

As shown in FIG. 6, the second screw motion member 8 which constitutes the movable die driving means together with the first screw motion member 7 and the cylinders 9 and 9 has an annular shape as a whole. A concentric thin groove is provided on a surface of the first screw movement member 7 facing the surface with the flange 72 therebetween. As described above, in this embodiment, the large number of small balls 72 a provided on the flange 72 of the first screw motion member 7.
A rolling guide mechanism for rotating motion rolling along the concentric groove of the second screw motion member 8, and a first screw motion member with respect to the second screw motion member 8. 7 is rotatable.

Therefore, the upper circumferential end of the first screw motion member 7 is fixed to the peripheral portion of the material projecting side surface of the movable die 5 inserted into the guide fixing die 4,
On the lower surface of the second screw movement member 8, two cylinders 9,
By moving the piston rods 9a, 9a and extending or retracting the piston rods 9a, 9a, the movable die 5 can be screwed. For example, by extending the piston rods 9a, 9a,
To the material entering side of the guide fixing die 4 and rotate clockwise as viewed from the stem 2 side,
The movable die 5 can be screw-moved. And
By the movable die driving means, the movable die 5 can be smoothly and accurately screw-moved.

Next, the control device 10 will be described. Reference numeral 10a denotes a cylinder control unit (hydraulic circuit) having a control valve and the like for controlling the expansion / contraction operation of the cylinders 9, 9, and 10b controls the expansion / contraction operation of the extrusion cylinder 3 for pressing the aluminum alloy billet A to the container tip side. Extrusion cylinder control unit (hydraulic circuit) with control valve for controlling
It is. The control device 10 for controlling the movement of the movable die 5 by the movable die driving means includes a computer. When the dimensional shape information of the torsion profile to be extruded is input at the terminal console 11, the control device 10 generates a twisted portion having an equal pitch or a torsion portion having an irregular pitch based on the dimensional shape information. The moving amount of the movable die 5 required to obtain the set extrusion length of each torsion portion, the moving speed of the movable die 5 required to obtain a set torsional form of equal pitch or unequal pitch, and Is calculated, and the cylinder control unit 10 is controlled so that the calculated value is obtained.
a is given a command signal at a predetermined timing. Further, the control device 10 gives a command signal of the extrusion speed to the extrusion cylinder control unit 10b at a predetermined timing so that the stem speed corresponds to the extrusion amount of each torsion portion or non-twist portion. . Reference numeral 12 denotes a position detector (pulse oscillator) for detecting the amount of movement of the stem 2, and the control device 10 controls the amount of extrusion (extrusion length) of the torsion-shaped material during molding based on the detection signal from the position detector 12. ).

Next, a method for extruding and forming a torsion-shaped member using the torsion-shaped member extruding apparatus having the above-described structure will be described. FIG. 8 is a perspective view showing an example of a torsion profile extruded according to the present invention.

The portion (a) in FIG. 8 is a non-twisted portion to which no twist is applied. The movable die 5 is positioned as the initial position by the cylinders 9, 9 at the material exit side end of the fixed guide die 4 (see FIG. 1). The extrusion is started at the movable die position, the movable die 5 is maintained at the initial position for a predetermined period without screw movement, and as shown in FIG. The untwisted portion of the mold is molded for a predetermined length.

Next, the portion (b) in FIG. 8, that is, the unequal pitch torsion portion will be described. Cylinder 9,
By extending the piston rods 9a, 9a for a predetermined period of time while varying their speeds non-constantly, the movable die 5 is screw-moved by a predetermined amount of movement while its moving speed is varied non-constantly. As a result, as shown in the portion (b), the unequal pitch torsion portion in which the change in the phase of the cross section is not constant but changes is formed to a predetermined length.

Next, the portion (c) in FIG. 8, that is, the equal pitch torsion portion will be described. Cylinder 9,
By extending the piston rods 9a, 9a at a constant speed for a predetermined period of time, the movable die 5 is screw-moved by a predetermined moving amount at a constant moving speed. Thereby, the above (c)
As shown in the portion, a constant-pitch torsion portion having a constant cross-sectional phase change is formed with a predetermined length.

Although not shown, the cylinder 9,
By contracting and retracting the piston rods 9a, 9a of FIG. 9, a reverse torsion portion in which the torsion is applied in the opposite direction to the portion (c) can be formed. In addition, by making the movable die 5 intermittently perform the screw movement, it is possible to extrude a torsion-shaped material to which a twist is applied not intermittently but intermittently in the shape material longitudinal direction.

Next, a description will be given of what kind of control is performed when a material is extruded and formed by using the torsion profile extruder shown in FIG. FIG. 9 is a flowchart for explaining a method for controlling the extrusion of a torsion bar according to the present invention.

First, based on the dimensions and shape of the torsion profile to be extruded and formed, the initial position of the movable die 5 and the torsional portions of the torsion profile at equal pitch or non-equal pitch are formed. The necessary moving amount and moving speed of the movable die 5 are obtained by calculation (step S).
1). Thereafter, the movable die 5 is positioned at the initial position (Step S2), and the extrusion molding is started (Step S3).

Next, it is determined whether or not the start position of the torsion portion has been reached (step S4). If the start position has not been reached (NO in step S4), extrusion is performed without moving the movable die 5 in step S6, and a non-twisted portion to which no twist is applied is formed.

If the start position has been reached (YES in step S4), the flow advances to step S5 to move the movable die 5 according to each of the equal pitch or unequal pitch torsion portions.
Is screw-moved with respect to the torsion portion at the movement amount / movement speed determined in advance in step S1. This allows
Equal pitch or unequal pitch torsions are extruded. Thereafter, it is determined in step S7 whether or not the extrusion molding has been completed. If the extrusion has not been completed (NO in step S7), the process returns to step S4. In this way, every time the profile material being extruded reaches the start position of the torsion portion before the end of the extrusion molding process, the movable die 5 is screwed at the moving amount and moving speed determined in step S1. In this way, the control of the extrusion of the torsion bar is performed.

[0034]

As described above, according to the method for extruding a torsional section, the apparatus for extruding a torsional section, and the method for controlling the extrusion of a torsional section according to the present invention, it is possible to use an aluminum alloy or the like as a material in the longitudinal direction of the section. A movable die having an extrusion hole through which the material passes in the longitudinal direction of the profile is screw-moved to obtain a torsional profile in which the phase of the cross section perpendicular to the longitudinal direction of the profile changes along the longitudinal direction. From this, it is possible to obtain a torsion profile with good shape accuracy,
Further, unlike conventional techniques, it is possible to obtain a torsion profile in which the torsion is applied intermittently instead of continuously in the longitudinal direction of the profile, and a torsion profile in which the torsion is not equal pitch but unequal pitch.

[Brief description of the drawings]

FIG. 1 is a view showing the overall configuration of a torsional member extrusion molding apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a guide fixed die of the dice device according to the present invention.

FIG. 3 is a perspective view showing the guide fixing die when cut along the line AA in FIG. 2 and viewed from the direction of the arrow.

FIG. 4 is a plan view showing a movable die of the dice device according to the present invention.

FIG. 5 is a perspective view showing the movable die when cut along the line AA in FIG. 4 and viewed from the direction of the arrow.

FIG. 6 is a cross-sectional view illustrating a movable die driving unit according to the present invention.

FIG. 7 is a perspective view showing a first screw motion member in FIG. 6;

FIG. 8 is a perspective view showing an example of a torsion profile extruded according to the present invention.

FIG. 9 is a flowchart illustrating a method for controlling the extrusion of a torsion bar according to the present invention.

FIG. 10 is a perspective view showing a hollow torsion member manufactured by a conventional extrusion die.

[Explanation of symbols]

1 ... container 2 ... stem 3 ... extrusion cylinder 4 ...
Guide fixed die 4a: spiral guide groove 5: movable die 5a: protrusion 5b: extrusion molding hole 6: holder 7: first screw movement member 71: cylindrical body 72:
Flange 72a Small ball 8 Second screw motion member 9
Cylinder 9a Piston rod 10 Control device 10
a: cylinder control unit 10b: extrusion cylinder control unit
11 Terminal console 12 Position detector A Aluminum alloy billet

Claims (3)

[Claims] 1. A guide fixing die having an annular shape, a spiral guide portion on an inner peripheral surface thereof, and an extrusion molding hole, which is fixed by being mounted on a front end opening portion of a container in which a material is stored. A movable die which is movably inserted along the spiral guide portion into the fixed guide die, and presses a material stored in a container to press the extrusion hole of the movable die. By moving the movable die along the spiral guide portion while extruding the movable die along with the screw movement for simultaneously performing the translational movement and the rotational movement, the profiled material is moved along the profiled material longitudinal direction. A method for extruding a torsional section, wherein a torsional section whose cross section perpendicular to the longitudinal direction changes in phase is extruded. 2. A container in which a material is stored, a material pressing means for pressing the material in the container toward the front end of the container, and a ring attached to and fixed to the opening at the front end of the container to form an annular shape. A guide fixed die having a spiral guide portion on the surface, and an extrusion hole through which the material pressed by the material pressing means is extruded, and moved along the spiral guide portion in the guide fixed die. A dice device comprising a movable die inserted so as to be capable of being inserted, and a movable die driving means for moving the movable die along the spiral guide portion, thereby causing the movable die to perform a screw motion for performing a translational motion and a rotary motion simultaneously. And a control device for controlling the movement of the movable die by the movable die driving means, wherein the phase of a cross section perpendicular to the longitudinal direction of the profile changes along the longitudinal direction of the profile. An apparatus for extruding a torsion-shaped material, wherein the torsion-shaped material is extruded. 3. A torsion characterized in that when a material is extruded by using the torsion profile extruder according to claim 2 to obtain a torsion profile, the extrusion process is controlled by the following steps. Control method for extrusion of section. (A) From the dimensions and shape of the torsion profile to be extruded in advance, the initial position of the movable die and the amount of movement of the movable die required to form each torsion portion of the torsion profile.
Determine the moving speed. (B) The movable die is set at the initial position, and the extrusion of the material is started. (C) By the time the extruded material reaches the start position of the torsion portion before the end of the extrusion forming process, the movable die is moved at the moving amount and the moving speed determined in the step (a). Make a screw movement.