JPS597420A - Manufacturing method of metal linear body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Technical Field) (Background Art) In recent years, friction-driven extrusion devices have been developed (for example, in
7-31859, etc.), used for extrusion of copper, aluminum, or their alloys.0 This is a pressurized metal container that uses a conduit formed by a driving wall and a fixed wall with a smaller area. When metal is supplied from the front end of the pipe, the metal is driven inside the pipe by the frictional force of the wall surface, and is sent toward the extrusion die installed near the rear end of the pipe, increasing the extrusion pressure. The metal powder is applied and continuously extruded. At this time, the metal powders are metallurgically bonded to each other due to the friction of the metal due to the fixed wall surface in the pipe, heat generation due to processing, and extrusion pressure.

However, in this method, sufficient processing is applied to the surface layer of the metal, sufficient processing heat is generated, and metal bonding is sufficient, but the extrusion pressure during extrusion is transmitted to the inside, and therefore processing Heat is insufficient and metal bonding is also insufficient. Particularly when the extrusion ratio is low (8 or less), it is easy to see areas where metal bonding is insufficient in the internal structure of the product due to reasons such as insufficient processing heat. This phenomenon is particularly noticeable in high-concentration alloys, which have the disadvantage of poor toughness at edges.

In order to eliminate this drawback, increase the power of the extrusion device,
This problem can be solved by increasing the extrusion ratio, but this will only unnecessarily cause trouble for the machine.

(Disclosure of the Invention) The present invention has been made to solve the above-mentioned problems, and by performing extrusion in two stages, internal defects occurring in the first stage can be removed by extrusion in the second stage. The purpose of the present invention is to provide a method for easily manufacturing a metal wire body that is free from defects and has good toughness even if the extrusion ratio is low, in which the metal bonding is promoted in both the circular and external directions. be.

The present invention is based on a drive IIJ wall surface and a fixed wall m with a smaller area than that.
Using two friction drive type extrusion devices that use the pipe line formed by
After feeding the metal powder to the front end of the pipe line of the extrusion device fJ and extruding the linear body, the linear body is supplied to the front end of the pipe line of the other extrusion device to extrude the linear body. This is a method of manufacturing a metal linear body, which is characterized by extruding the body.

The friction-driven extrusion device used in the present invention is an extrusion device configured so that metal is fed and extrusion pressure is obtained by friction caused by the drive of the driving wall surface of the pipe. Conform device as shown (Japanese Unexamined Patent Publication No. 47-31
No. 859), or a Wire Jo
urnal, 1976+April issue, p. 64)
It is.

Hereinafter, the present invention will be explained by examples using the drawings.

The figure is a cross-sectional view for explaining an embodiment of the method of the present invention. In the figure, A and B are conform devices having substantially the same structure. These have grooves 2 (or 1) on the outer circumferential surface.
The drive wall surface (groove surface) a (+a) of drive wheel 1 (11) having
) and the fixed surface 5 (15) form a conduit 6 (16), and the drive i11! of the conduit 6 (16)! Rear end 8 in the + direction (+
8) is closed. The extrusion die 9 (+!11) is provided near the rear end 8 (+8) of the pipe line 6 (16). In the conforming device B, the device A is supplied to the front end opening 17 of the conduit 16.
A linear body 20 that has been extruded is supplied.

Using two conform devices configured as above,
In order to extrude a metal linear body by the method of ``this process,'' first, the metal powder 1o is continuously supplied to the powder supply tool 7 of the device A, and the powder 10 is transferred to the rear end of the conduit 6 by the friction of the driving ω1 wall surface 3. 8
B4
The linear body 2° is of an intermediate size larger than the product size, and is matched to the supply size of the device B. At this time, powder 10
is caused by friction in the pipe 6, heat generation due to processing, and extrusion pressure.
Metal powders are metallurgically bonded together, but since the extrusion ratio is often small, the above heat generation, etc. is not sufficient, and the extruded linear body 20
There are likely to be areas where the metal bonding is insufficient inside.

Next, the extruded linear body 20 is successively supplied to the front end opening 17 of the conforming device B, and extruded as the metal linear body 21 from the extrusion die 19 in the same manner as described above. By this second stage of extrusion, sufficient processing heat and processing pressure are applied to areas where metal bonding was insufficient in the first stage of extrusion, so that sufficient metal bonding is achieved.

As described above, according to the two-stage extrusion according to the present invention, the conventional one-stage extrusion
Compared to products extruded to the same size by repeated extrusion, the internal structure is more uniform, much improved, there are no internal defects, and the toughness such as bending value and twisting value is improved.

In addition, in the method described above, the first stage extrusion and the second stage extrusion were performed in tandem, but in the present invention, these may be performed in separate steps.

The metals to which the method of the present invention is applied include not only metals such as aluminum and copper, or alloys thereof, but also HL or Cu in which reinforcing particles such as oxides, nitrides, and carbides are dispersed, which are likely to cause defects during extrusion. It is also possible to use branch-strengthened alloys, etc.
It is particularly effective in improving toughness.

Although it is theoretically possible to perform extrusion in multiple stages (three or more stages), the equipment is complicated and expensive, and two-stage extrusion is sufficient from a structural point of view to eliminate defects. Disappeared.

(Example) Using a conforming device arranged in tandem as shown in the figure and a conforming device divided into two steps, first, AI or A4 alloy powder having the composition shown in Table 1 was supplied. Once extruded into a 9.5 mmφ wire rod, this was further supplied and extruded in the second stage, and a 6 m
A wire rod of mφ was created. (Fat wheel) V l,
The diameter of +1 is 840mm, and the rotation speed during extrusion is 5rp.
It was m.

For comparison, a conventional conform device was used to extrude the powder to a diameter of 6 mm in one extrusion. In all cases, the overall extrusion ratio was 625.

The properties and structure of the obtained 6 mmφ wire are shown in Table 1.

The bending value is equal to the entire bending diameter, and the left and right bends are alternately 90°.
The number of times it was bent until it broke was expressed as 900 bends.

Table 1 According to Table 1, even when the extrusion ratio is low (6, 25), extruded paulownia produced using the unexploded 8A method has no internal defects and has high toughness as shown in the bending value. I know that it will happen. Further, no change in properties was observed whether the extrusion was carried out in tandem or in two separate stages.

On the other hand, in the case of the conventional one extruded in one step, there were many places where the metal joints were not raised inside, and the toughness of bending (11i etc.) was poor.

(Effect of 1 octopus firing) The unfired J] method configured as described above has the following effects.

(b) Using two friction-driven extrusion devices as described in 1 [2], first, metal powder is supplied to the front end of the piping path of one of the extrusion devices and the linear body is extruded. Since the linear body is fed to the front end of the pipe of one extrusion device in the pond and extruded into a linear bar, even if there are insufficient metal joints in the first stage of extrusion. Since sufficient processing heat and pressure are applied during the second extrusion stage, there are no defects such as voids inside the product, metal bonding is sufficient, and the structure is uniform, improving toughness such as bending value and twisting value. A metal wire body made of metal can be submerged.

In particular, even when the extrusion ratio is small, the You can easily get what you need.

(b) Since the extrusion ratio per stage is small and the extrusion pressure is small, the power of the extrusion device is small and the size is small, so the overall equipment cost is low.

Therefore, one method of failure is particularly Al-Pb, Al-F
e.

If applied to the continuous production of filament bodies from powder such as kl Zr alloy, there is an advantage that products with excellent uniformity of properties can be produced easily and with high productivity.

[Brief explanation of drawings]

The figure is a sectional view for explaining an example of the misfire J method. 1.11...drivell11 wheel, 2.12...groove,
3.13... Drive wall surface (groove surface), 4,14... Fixed shoe block. 5.15・Fixed wall surface, 6.16・Pipe line, 7・Powder supply tool, 8.18・Rear end, 9.19・Extrusion die 7,
10... Metal powder, 2o, 2... Linear body, A, B...
... Conform device.

Claims (2)

[Claims] (1) Two friction-driven extrusion devices are used in which a pipe line formed by a driving wall surface and a fixed wall surface with a smaller area is used as a pressurized metal container, and first, the pipe of one of the extrusion devices is The linear body is extruded by supplying metal powder to the front end of the channel and extruding the linear body, and then supplying the linear body to the front end of the conduit of one of the extrusion devices in the pond to extrude the linear body. A method for manufacturing a metal linear body. (2) The method for producing a metal linear body according to claim 1, wherein the metal powder is A4 or h1 alloy powder.