JPH0255623A - Manufacture of extruded stock having torsion - Google Patents

Abstract

PURPOSE:To obtain a uniform twist angle, etc., extending over the overall length in the axial direction of an extruded stock by rotating one or both of chucking blocks in the reverse direction to each other around the axis. CONSTITUTION:A madrel 6 to which lubricating oil is applied is inserted at a prescribed clearance into a through-hole 2 in the axial direction, and both end parts of a hollow extruded stock 3 having plural lines of projections 1 in the axial direction on the surface are attached at a prescribed clearance to a chuck hole 5 of chucking blocks 4, 4', respectively. Also, one of these chucking blocks 4, 4' is attached to a rotary housing 8 for rotating around the center axis of the hollow extruded stock 3 by a torsion use motor 7, and the other is attached to a non-rotary housing 9. Moreover, one end part of the hollow extruded stock 3 and one end part of the mandrel 6 which is allowed to pass through the inside of the through-hole 2 are connected by allowing a pin 10 to pass through, the pin 10 is protruded from the outside peripheral surface of the extruded stock 3 and detained to the outside of the chucking block 4 of the rotary housing 8 side, and by pulling the other end of the extruded stock 3 by driving a DC motor 11, tension is applied to the extruded stock 3.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing an extruded product having a twist, and in particular, a long straight hot extrusion material such as A1 or λ alloy is twisted to produce a high-quality product. It gives a precise twist.

[Prior Art and Problems to be Solved by the Invention] Conventionally, twisted extruded products have been manufactured as follows. That is, during hot extrusion processing, the extruded material is subjected to twist forming by extruding the material through a hole in a die forming die whose inner peripheral surface (bearing) is twisted.

However, in this manufacturing method in which twisting is simultaneously applied during hot extrusion processing, the metal flow differs between the early and late stages of extrusion, resulting in a problem in that uniform twisting accuracy cannot be obtained over the entire length of the extruded material. Even when straightening the curves of the extruded material after rough extrusion, uniform straightening over the entire length of the extruded material was impossible.

[Means to solve the problem]

In view of this, as a result of various studies, the present invention provides a method for manufacturing an extruded material having torsion, which can obtain a uniform twist angle over the entire axial length of the extruded material by performing twisting after obtaining the extruded material. was developed.

That is, one aspect of the present invention is to detachably attach both ends of an extruded material to chuck holes formed in a chucking block, and to apply tension to the extruded material in the axial direction of the chucking block or without applying tension to the chucking block. The extruded material is twisted by rotating one or both of them around an axis in mutually opposite directions.

Another aspect of the present invention is to removably insert a core rod with a lubricated surface into the through hole of a hollow extruded material having a through hole in the axial direction, and attach both ends of the hollow extruded material to a chucking block. The chucking block is removably attached to the drilled chuck hole, and one or both of the chucking blocks are rotated in opposite directions around the axis with or without applying tension to the hollow extruded material in its axial direction. It is characterized by twisting hollow extruded material.

(Function) As shown in Fig. 1, the present invention is a hollow extruded material having a plurality of protrusions (1) in the axial direction on the outer surface and a through hole (2) in the axial direction at the center of the cross section. Both ends of (3) are removably fitted into chuck holes (5), which are similar in shape to the outer cross-sectional shape of the extruded material (3) and have a slightly larger area, which are bored in the chucking block (4). However, at this time, the extruded material (3
) The gap between the outside dimension and the chuck hole (5) dimension is 0.
．． 1 to 0.3 shoes is appropriate.

Further, the clearance between the through hole (2) of such a hollow extruded material (3) and the core rod (6) detachably fitted into the through hole (2) is preferably 0.1 to 0.2 M.

The reason why tension is applied to the extruded material during rough twisting is to keep the cross-sectional dimension before twisting constant during the twisting process, and by doing this, a uniformly twisted product can be obtained over the entire length of the extruded material. has advantages. Note that depending on the conditions, no tension may be applied. It is also good to adjust the tension by adjusting the twist angle.

(Example) As shown in Figures 1 and 2, the core rod (6
) is inserted, and the A1-based JIS 6063 alloy (Ai-0, 20~0.
A chucking block (4) holds both ends of the hollow extruded material (3) of 60wt%3 +-0.45~0.9wt%My).
(4') are installed in the chuck holes (5) with a clearance of 0.2 m, and one of these chucking blocks (4H4°) is roughly connected to the center axis of the hollow extruded material (3) by the torsion motor (7). One was mounted on a rotating housing (8) that rotates around the other, and the other was mounted on a non-rotating housing (9).

Further, one end of the hollow extruded material (3) and one end of the core rod (6) passed through the through hole (2) are connected through a pin (10), and the pin (10) is connected to the extruded material ( The chucking block (4) on the rotating housing (8) side protrudes from the outer peripheral surface of the rotating housing (8).
), the other end of the extruded material (3) is pulled by driving the DC motor (11), and the extruded material (3) is pulled out by driving the DC motor (11).
) was applied with tension.

In the above state, the torsion motor (7) was driven to rotate the rotary housing (8) to produce the torsion extrusion products shown in FIGS. 3(A) and 3(B).

In place of the DC motor (11), the DC motor (11') can be used to move the housing transfer rack (12) for tension or stroke control. Furthermore, (13) is a rotation angle detector, and the main force of the DC motor (11) (11') can be changed according to the torsion angle detected by this, and the tension applied to the extruded material can also be changed.

Examples of other twist extrusion products made by this method are shown in Section 4.
They are shown in Figures (A) (B), Figure 5 (A) (B), and Figure 6 (A) (B). That is, Fig. 4 (a) and (b) show a hollow extruded material with a smaller number of outer protrusions than in the above embodiment, and Fig. 5 (a) and (b) show a rough shape when the inner and outer circumferences are approximately triangular. Figures 6(a) and 6(b) show the case of a solid extruded material with no through holes in the axial direction.

Next, in the torsionally extruded material shown in FIG. As shown in Figure 7, the distance traveled by the robot (hereinafter referred to as "lead") was measured at 12 consecutive locations along the entire length, and the results were recorded in Figure 8.
Shown in the figure.

According to Figure 8, for the standard lead length of 250 mm,
The measured lead dimensions are the minimum of 249.85M and the maximum of 2
50.05 m, which clearly shows extremely high accuracy.

(Effects of the Invention) As described above, according to the present invention, it is possible to produce a twisted material having uniform twisting accuracy over the entire length of the extruded material, and other industrially significant effects are achieved.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a state in which an extruded material with a core rod passed through a through hole is removably fitted into a chuck hole of a chucking block, and Fig. 2 is a torsion shown in an embodiment of the method of the present invention. The side sectional views of the apparatus, FIGS. 3 to 6, respectively show the twisted extrusion material produced by the method of the present invention. In each of these figures, (A) is a front view, (B) is a side view, and FIG. This figure is an external view of the torsionally extruded material showing the measurement positions of the leads of the torsionally extruded material shown in FIG. 3, and FIG. 8 is an actual measurement diagram showing the dimensions of each lead of the torsionally extruded material according to the method of the present invention. 1...Protrusion, fin 2...Through hole 3...Hollow extruded material 4.4゛...Chucking block 5. ...
...Chuck hole 6 ..... Core rod 7 ..... Torsion motor 8 ..... Rotating housing 9 ..... Non- Rotating housing 10...Pin 11.11°...DC motor 12...Housing transfer rack 13...
...Rotation angle detector Fig. 1 Fig. 3 (a) (b) Fig. 5 (a) (b) Fig. 4 (a) (b) Fig. 6 (a) (b)

Claims (2)

[Claims] (1) Both ends of the extruded material are removably attached to the chuck holes drilled in the chucking block, and tension is applied to the extruded material in its axial direction, or one or both of the chucking blocks are attached without applying tension. A method for manufacturing an extruded material having torsion, characterized by twisting the extruded material by rotating in opposite directions around an axis. (2) A core rod with a lubricated surface is removably inserted into the through hole of a hollow extruded material having a through hole in the axial direction, and both ends of the hollow extruded material are inserted into the chuck holes drilled in the chucking block. The hollow extrusion is removably attached to the hollow extrusion by rotating one or both of the chucking blocks in opposite directions around the axis with or without applying tension to the hollow extrusion in the axial direction. A method for manufacturing an extruded material having twisting characteristics.