JPH10166037A - Extruding device for variable section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the extruding device for variable section capable of stably performing the extrusion for variable section with excellent precision. SOLUTION: The extruding device is provided with a container 2 in which a stock 1 to be formed is stored, a press 3 which is arranged on one end side of the container and presses the stock 1 in the container toward the other end side, a die assembly 5 which is arranged on the other end side of the container and forms the stock 1 into the product shape through an extrusion hole 4, a die stack 6 to support the die assembly on a block, and a driving means 8 to change the shape of the extrusion hole. The die assembly 5 is provided with a fixed die 11 in which a fixed die hole is made, and a movable die 12 which is movably provided on the fixed die and in which a movable die hole is made, a tip of a driving part 24 of the driving means is connected to the movable die 12, and an opening part in which the driving part can be inserted is formed in the fixed die and the die stack.

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 molding apparatus for extruding a molded body whose cross-sectional shape changes in the extrusion direction.

[0002]

2. Description of the Related Art As is well known, various pipes such as fin tubes for heat exchangers and various structural members used in vehicles for which weight reduction is strongly required are formed by extrusion of aluminum or aluminum alloy. Is often used. In this extrusion molding, a die having an extruded hole having a cross-sectional shape such as the above-described constituent member is fixed to a tip portion of a container, and a heated material (a billet) is placed in the container.
And insert the billet into the press (stem)
By pressing to the die side and extruding from the extrusion hole, the constituent member is formed. According to such an extrusion process, since the extrusion hole of the die has a constant cross-sectional shape, the obtained component member or the like is also formed into a constant cross-sectional shape in the longitudinal direction.

However, among the structural members described above, for example, in the structural members of various vehicles such as general passenger cars and trucks, when these are formed by the extrusion dies, for example, the obtained side frames are oriented in the longitudinal direction. In order to have a constant cross-sectional shape, in other words, a constant second moment of area, a member having a dimension and strength more than necessary in the longitudinal direction is formed, and the molding material is wasted and uneconomical. In addition, there is a problem in that the installation space of the constituent member is prevented from being reduced in size and weight.

[0004]

A conventional extrusion die for solving such problems is disclosed in Japanese Patent Laid-Open Publication No.
As disclosed in Japanese Patent No. 31527, the extrusion die is composed of a fixed die that is fixed to a container, and a movable die that is movably provided with respect to the fixed die, and by appropriately moving the movable die, By changing the shape of the extrusion hole formed by the communicating part between the fixed die hole of the fixed die and the moving die hole of the moving die, and changing the cross-sectional shape of the component to be formed in the longitudinal direction, for variable cross-section extrusion Dice have been proposed. According to such a variable cross-section extrusion die, it is possible to perform extrusion molding in a shape corresponding to the generated stress distribution, for example, in the longitudinal direction such that the stress is constant at any part such as the center and both ends. There is an advantage that a component or the like having a typical cross-sectional shape can be formed.

However, when trying to incorporate the above-mentioned conventional die for variable-section extrusion into an extrusion molding apparatus, if the stationary die and the movable die are to be moved relative to each other, both of the fixed die and the movable die are moved in the direction of extrusion by the press. It is difficult to maintain the extrusion reference center of the molded body extruded from the above, and thus it is difficult to perform stable extrusion, and the apparatus is complicated. Due to the application of a load in the direction, it is extremely difficult in terms of structure to accurately and smoothly slide the moving die with respect to the fixed die while securely holding the relative position between the press and the fixed die. In addition, there are various practical problems that it is extremely difficult to extrude with high precision. The present invention has been made to effectively solve the problem that occurs when such a variable cross-section extrusion is actually performed, and a variable cross-section extrusion that can stably perform a highly accurate variable cross-section extrusion. It is intended to provide a device.

[0006]

According to a first aspect of the present invention, there is provided a variable cross-section extrusion molding apparatus according to the present invention, comprising: a container in which a molding material is stored; A press machine for pressing the material to the other end, a die assembly disposed at the other end of the container, and forming a molded material extruded from the container into a product shape through an extrusion hole; and a die assembly. A die stack supporting the base on a base, and driving means for changing the shape of the extrusion hole.The die assembly is fixed to the die stack and has a fixed die with a fixed die hole formed therein. A movable die provided movably on the fixed die and having a movable die hole formed therein, wherein the communicating portion between the fixed die hole and the movable die hole constitutes the above-described extrusion hole having a variable shape. The moving die is connected to the tip of the driving part of the driving means, and the die assembly and the die stack are formed with openings through which the moving dice or the driving part can be inserted, respectively. It is.

According to a second aspect of the present invention, the die assembly includes a fixed die in a tubular die ring in the direction of extrusion of the molding material, and a back plate for supporting the fixed die. And an opening is formed in the outer periphery of the die ring so as to communicate with the opening of the fixed die and through which a moving die or a drive unit can be inserted.

Further, according to a third aspect of the present invention, there is provided a press machine, a container and a die stack supporting the die assembly according to the first or second aspect, which are sequentially arranged in a horizontal direction, and the fixed die and the die are arranged in a horizontal direction. An opening is formed in the side wall of the stack, and a driving means is fixed to the side wall of the die stack.

[0009] The invention described in claim 4 is the invention according to claim 3.
In the die stack described in the above, a concave portion is formed to open upward to insert and remove the die assembly, and on the inner wall portion of the concave portion, a groove portion is formed in a direction intersecting the extrusion direction of the molding material, The outer periphery of the die assembly is fitted in the groove.

In the invention according to any one of claims 1 to 4, a die assembly having a fixed die and a moving die is supported on a base via a die stack, and is formed on the die assembly and the die stack. The movable dies or the driving units connected to each other are inserted into the openings, and the movable dies are driven. Therefore, the position of the fixed dies is used as a reference, and the movable dies are moved relative to the fixed dies. Can be moved, so that high-precision variable-section extrusion molding can be stably performed, and since the extruded body extends with reference to the fixed die hole, its guide becomes easy. .

By the way, in this type of extruder,
During extrusion molding, a large load acts on the die assembly in the extrusion direction due to the pressing force from the press. Therefore, when the die assembly is composed of only the fixed die and the movable die, it is necessary to increase the thickness of the fixed die in order to resist the shearing force caused by the load. On the other hand, since high precision of several tens to several hundreds of microns is required for processing of the fixed die hole of the fixed die, when the thickness dimension of the fixed die becomes large, the processing is troublesome and the manufacturing unit price is reduced. Invite soaring.

In this regard, according to the second aspect of the present invention,
Since the die assembly has a configuration in which a back plate for supporting the fixed dies and the fixed dies are housed in a tubular die ring, the thickness of the fixed dies can be set to be thinner, and the production thereof can be performed. As well as the ease of the die ring and the back plate, for various fixed dies corresponding to different shapes,
It is economical because it can be used as a common member. By the way, if a lead-in plate is arranged on the upstream side of the fixed die and the fixed die is sandwiched between the back plate and the lead-in plate, the pressing force acting on the fixed die by the lead-in plate can be reduced. It is preferable because the thickness of the fixed die can be further reduced, and the above-mentioned effect can be further enhanced. In this case, in order to drive the moving die from the outside, it is necessary to form an opening through which the moving die or the driving unit can be inserted in the outer peripheral portion of the die ring in communication with the opening of the fixed die. Good.

When applied to an extrusion apparatus in which a die stack supporting the above-mentioned press machine, container and die assembly, which is a so-called horizontal type, is applied horizontally, a container is usually placed above the extrusion apparatus. A cutting machine (shear) for cutting the end of the molded material extruded from is provided, and the lower floor (base)
In order to secure a large space for installing the driving means between them, the base for installing them in order to eliminate the relative displacement of the press machine and the die stack becomes extremely large and is unsuitable. . On the other hand, in the third aspect of the present invention, the opening is formed in the side wall of the fixed die and the die stack, and the driving means is fixed to the side wall of the die stack. A die stack or the like can be directly installed on the floor, and a rational arrangement for reducing relative displacement can be performed.
In addition, since the driving means is directly fixed to the die stack that supports the fixed dies, there is no relative displacement between the driving dies and the fixed dies during extrusion. Accurate and smooth operation can be performed.

In this case, according to the invention described in claim 4, the die assembly can be easily inserted and removed from the upper opening of the die stack, and the die stack can be fitted by mutual engagement. Since the die assembly can be reliably supported in the thrust direction, the extrusion accuracy can be further improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show an embodiment of a variable cross-section extrusion molding apparatus according to the present invention. FIG.
As shown in FIG. 1, this variable section extrusion molding apparatus includes a container 2 in which a billet (molded material) 1 of aluminum or an aluminum alloy is stored, and a billet 1 in the container 2 which is disposed at one end of the container 2. (Pressing machine) 3 which presses the container 2 toward the other end, and an extrusion hole 4 which is provided at the other end of the container 2 and which extrudes the molded material from the container 2.
A die assembly 5 formed into a product shape through
A die stack 6 for supporting the die assembly 5 on a base, and an end platen 7 disposed at a stage subsequent to the die stack 6 are disposed in a horizontal direction.
This is schematically configured by providing a driving device (driving means) 8 that changes the shape of the device. Here, the stem 3, the die stack 6, and the end platen 7 are respectively fixed on a floor surface (base), and the stem 3 and the end platen 7 are further connected to tie rods (illustrated in FIG. Are abbreviated.).

The die stack 6 is shown in FIGS.
As shown in FIG. 5, a U-shaped concave portion 9 is formed at the center of the rectangular plate-shaped member and opens upward. And
The die assembly 5 is housed in the recess 9 so that it can be inserted and removed. The die assembly 5 is for extruding an H-shaped member in which a part of a flange is not formed. The die assembly 5 is provided with a fixed die 11 in a cylindrical die ring 10 in the extrusion direction of the molding material 1 and a fixed die 11. A movable die 12 slidably provided in the die 11, a back plate 13 for supporting the fixed die 11, a fixed die 11
And a lead-in plate 16 which sandwiches the fixed dies together with the back plate 13 and is provided on the upstream side. Here, a groove 9a is formed in the inner wall portion of the concave portion 9 of the die stack 6 in a direction intersecting the extrusion direction of the molding material, and a convex portion 10a formed on the outer periphery of the die ring 10 is fitted into the groove 9a. Have been combined.

The fixed die 11 is a circular plate member having a substantially external appearance formed of hot work tool steel. As shown in FIGS. 3 and 4, the fixed die 11 has a central portion of an upper surface 15 located on the container 2 side. A recess 17 is formed as a flow path for the molded material 1 extruded from the container 2, and a fixed die hole 18 is formed in the bottom of the recess 17.

The fixed die hole 18 has a flange portion forming hole 19 having the same width as the maximum thickness of one flange of the H-shaped member to be formed, and a flange portion forming hole 1
9, a web forming hole 20 extending in a direction orthogonal to the central portion.
And a flange communication hole 21 formed at the other end of the web forming hole 20. The flange portion communication hole 21 has the same length as the flange portion formation hole 19 and is formed so as to have a larger width dimension than the flange portion formation hole 19. An opening 22 extending in parallel with the web forming hole 20 and penetrating between the side surfaces and communicating with the fixed die hole 18 is formed in the center of the side surface of the fixed die 11. A guide wall 23 for guiding the side surface of the movable die 12 slidably and densely is formed at a central portion of the side surface of the movable die 12. The movable die 12 is slidably provided in the opening 22 of the fixed die 11.

As shown in FIG. 5, the moving die 12 includes a head 25 inserted into the opening 22 and a head 2.
Device 8 for sliding 5 in opening 22
And a clamp portion 26 to which a distal end portion 24a of the drive shaft (drive portion) 24 is connected. The head 25 is a substantially rectangular plate-shaped member made of hot tool steel or the like, and has a flange portion forming hole 27 formed at the center thereof having the same size as the fixed die hole 18, Forming hole 2 orthogonal to the central part of the forming hole 27
8 and a movable die hole 30 formed of a flange communication hole 29 formed at the other end of the web forming hole. The web forming hole 28 is provided in the moving die 1.
It is formed so as to be parallel to the second side wall 31. Then, the moving die 12 positions the flange portion forming hole 27 on the flange portion communication hole 21 side of the fixed die hole 18,
The web forming holes 20 and 28 communicate with each other, and are slidably inserted along the guide wall 23 in the opening 22 of the fixed die 11.

On the other hand, as shown in FIG.
The driving device 8 is fixed to a side surface of the driving device 8. The driving device 8 is composed of a variable device 32 having a screw jack and a servomotor built therein, and a driving shaft 24 moved forward and backward by the variable device 32. The driving device 8 is provided with supports 33 interposed at four corners. , Is fixed to the side surface of the die stack 6. Here, openings 34 and 35 are formed in the side walls of the die stack 6 and the die ring 10, respectively, and the drive shaft 24 of the driving device 8 is inserted into the openings 34 and 35.

Next, a method of extruding an H-shaped member made of aluminum or an aluminum alloy using the variable cross-section extrusion molding apparatus having the above configuration will be described with reference to FIGS. First, after the heated aluminum billet 1 is inserted into the container 2 with the stem 3 retracted, the stem 3 is advanced and the billet 1 is extruded toward the fixed die 11 in the die assembly 5.
Then, as shown in FIG. 6, the die hole 4 formed by the communicating portion between the fixed die hole 18 and the movable die hole 30 is formed.
The molding material 1 is extruded from a portion (shown by hatching in the figure), and an H-shaped member having a cross-sectional shape of the die hole 4 is extruded. In parallel with this, the driving device 8
When the movable die 12 is slid in the opening 22 of the fixed die 11 via the drive shaft 24 by controlling the variable device 32, the length L of the web between the flanges of the member to be formed is gradually increased. Can be increased or decreased.

Next, the moving die 12 is further moved and set at the position shown in FIG.
Flange forming holes 19 and 27 and flange communicating holes 20
An H-shaped member having a flange having a thickness W corresponding to a portion communicating with the H-shaped member 29 is formed. At this time, by moving the movable die 12 while maintaining the above-described state, the thickness W of the flange can be appropriately changed in the longitudinal direction. Further, a position where the web forming holes 20 and 28 of the fixed die hole 18 and the moving die hole 30 communicate with each other, and the one flange portion forming holes 19 and 27 and the other flange portion communication holes 21 and 29 do not communicate with each other. When the molding material 1 is extruded in the above, the molding material 1
As a result, a flat component having only a flat bar-shaped web corresponding to the length of the extrusion hole 4 is formed.
As described above, by moving the movable die 12 to an appropriate position with respect to the fixed die 11 by the driving device 8, components having various variable cross-sectional shapes in the longitudinal direction can be easily formed. .

At this time, a thrust force generated by pushing the billet 1 in the container 2 by the stem 3 acts on the fixed die 11, and the thrust force is firstly distributed upstream of the fixed die 11. In order to act on the lead-in plate 16 provided,
1 is reduced. When extruding a variable cross-section member having another shape by the above-described variable cross-section extrusion molding apparatus, first, the entire die assembly 5 is hoisted by a suspending tool provided on the die ring 10 and is lifted upward from the concave portion 9 of the die stack 6. Then, the die assembly incorporating the fixed die and the moving die corresponding to the member may be stored in the concave portion 9 of the die stack 6.

As described above, in the variable cross-section extrusion molding apparatus having the above-described configuration, the die assembly 5 having the fixed die 11 and the moving die 12 is supported on the base via the die stack 6 and the fixed die Since the movable die 12 is driven by inserting the drive shaft 24 into the openings 34 and 35 formed in the die stack 6 and the die stack 6, the position of the fixed die 11 is used as a reference. On the other hand, since the movable die 12 can be moved, it is possible to stably perform high-precision variable-section extrusion molding, and to extrude the molded body with reference to the fixed die hole 11, The guide becomes easy.

Further, since the driving device 8 is directly fixed to the side wall of the die stack 6, there is no relative movement with the fixed die 11, so that the movable die 12 can be smoothly slid. In addition, since the die assembly 5 is configured such that the back plate 13, the fixed die 11, and the lead-in plate 16 are housed in the tubular die ring 10, the thickness of the fixed die 11 can be set smaller. The die ring 10, the back plate 13, and the lead-in plate 16 can be used as common members for various fixed dies corresponding to different shapes. It is.

In the above embodiment, only the case where an H-shaped component is extruded as the fixed die 11 and the movable die 12 has been described. However, the present invention is not limited to this. It is possible to incorporate stationary dies and moving dies for extruding cross-section components. In addition, die assembly 5
Is not limited to the configuration in which the fixed die 11 and the like are incorporated in the die ring 10, but the fixed die 11 and the movable die 1
The die assembly may be constituted by only two.

[0027]

As described above, according to the variable cross-section extrusion molding apparatus according to any one of claims 1 to 4, the moving die is moved with respect to the position of the fixed die as a reference. In addition to this, it is possible to stably perform high-precision variable cross-section extrusion molding, and the extruded body extends with reference to the fixed die hole, so that the guide becomes easy. Is obtained. According to the second aspect of the present invention, the thickness of the fixed die can be set to be thinner, which facilitates the manufacture thereof, and the die ring and the back plate have various shapes corresponding to different shapes. It is economical because it can be used as a common member with respect to the fixed die, and according to the third aspect of the invention, a rational arrangement for reducing the relative displacement of the press machine and the die stack in terms of strength. And the sliding of the movable die with respect to the fixed die can be performed smoothly. According to the invention as set forth in claim 4, the die assembly can be easily inserted and removed, and the thrust of the die assembly can be improved. The effect that the support in the direction can be surely performed and the extrusion accuracy can be further improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line II of FIG. 2, showing one embodiment of a variable cross-section extrusion molding apparatus of the present invention.

FIG. 2 is an overall schematic configuration diagram.

FIG. 3 is a plan view showing a fixed die of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a plan view showing the moving die of FIG. 2;

FIG. 6 is a schematic diagram showing a state in which an H-shaped molding material is extruded by an extrusion hole.

FIG. 7 is a schematic diagram showing a state where the moving dice of FIG. 6 are further moved.

8 is a schematic diagram showing a state in which the moving die of FIG. 7 is further moved to extrude an I-shaped molded material.

[Explanation of symbols]

 Reference Signs List 1 billet (molded material) 2 container 3 stem (pressing machine) 4 extrusion hole 5 die assembly 6 die stack 8 driving device (driving means) 9 concave portion 9a groove portion 10 die ring 10a convex portion 11 fixed die 12 moving die 13 back plate 16 Lead-in plate 18 Fixed die hole 22 Opening 23 Guide wall 24 Drive shaft (drive unit) 24a Tip 30 Moving die hole 34, 35 Opening

Claims (4)

[Claims] 1. A container in which a molding material is stored, a press machine disposed at one end of the container and pressing the molding material in the container toward the other end, and a pressurizing machine disposed at the other end of the container. A die assembly into which a die is provided for forming a molded material extruded from the container through an extrusion hole into a product shape, a die stack for supporting the die assembly on a base, and a shape of the extrusion hole The die assembly is fixed to the die stack, and has a fixed die having a fixed die hole formed therein. The fixed die has a movable die hole. A movable die, and the communicating portion between the fixed die hole and the movable die hole constitutes the extrusion hole having a variable shape, and the movable die has the drive hole. A variable cross-section extrusion molding apparatus, wherein a tip of a driving unit of a step is connected, and an opening through which the moving die or the driving unit can be inserted is formed in each of the die assembly and the die stack. . 2. The die assembly according to claim 1, wherein the fixed die and a back plate for supporting the fixed die are sequentially accommodated in a tubular die ring in a direction in which the molding material is extruded. The variable cross-section extrusion according to claim 1, wherein an opening portion through which the movable die or the driving portion can be inserted is formed in an outer peripheral portion of the ring so as to communicate with the opening portion of the fixed die. Molding equipment. 3. A die stack for supporting the press, the container and the die assembly are sequentially arranged in a horizontal direction, the opening is formed in a side wall of the fixed die and the die stack, and the die is formed. The variable section extrusion molding apparatus according to claim 1 or 2, wherein the driving means is fixed to a side wall of the stack. 4. The die stack has a concave portion formed to open upward to insert and remove the die assembly, and a groove portion is formed on an inner wall portion of the concave portion in a direction intersecting the extrusion direction of the molding material. The variable cross-section extrusion molding apparatus according to claim 3, wherein an outer peripheral portion of the die assembly is formed and fitted in the groove.