JPH0428443B2 - - Google Patents

Description

[Detailed description of the invention]

(Technical Field) The present invention relates to a method for manufacturing continuous metal products of various cross-sectional shapes from small pieces of metal material using a friction-driven extrusion device. (Background Art) In recent years, friction-driven extrusion devices have been developed (for example, JP-A-47-31859), and are used for extruding aluminum, copper, or alloys thereof. Conventionally, in order to manufacture a linear body from alloy powder such as Al using this apparatus, a method as shown in FIG. 1 has been adopted. In the figure, a conduit 6 is formed by a drive wall surface (groove surface) 3 of a drive wheel 1 having a groove 2 on its outer circumferential surface and a fixed wall surface 5 of a fixed shoe block 4 that is engaged with a part of the outer circumference of the wheel 1. The rear end 8 of the conduit 6 in the driving direction is closed. The extrusion die 9 is provided near the rear end 8 of the conduit 6. A powder supply tool 7 for supplying powder is provided at the front end opening of the conduit 6. When alloy powder 10 such as Al is continuously supplied to the powder supply tool 7 of the friction-driven extrusion device configured as described above, the powder 10 is fed toward the rear end 8 of the pipe line 6 by the friction of the drive wall surface 3. The linear body 11 is extruded from the extrusion die 9 by applying pressure and extrusion pressure. At this time, the powder 10 is heated due to friction in the pipe line 6, heat generated by processing, and extrusion pressure.
Alloy powders such as Al are metallurgically bonded together. However, in this method, gases (O, N), moisture (H ₂ O), etc. are adsorbed on the surface of alloy powder such as Al, and these are released from the powder due to the high temperature during extrusion, and the adsorbed water reacts with Al and generates _H2 gas. In addition, when the powder is continuously extruded toward the extrusion die, air is drawn in, which creates voids inside the extruded material, resulting in bubble-like defects called "blisters" on the surface. . In addition, alloy powders such as Al have extremely high water absorption, and if left in the atmosphere, they will contain a large amount of water.
The above-mentioned disadvantages are exacerbated. In addition, especially when the cross-sectional area of the product is large, the processing heat is low and the metal bonding between the powders is insufficient, resulting in a decrease in toughness. (Disclosure of the Invention) The present invention has been made to solve the above-mentioned problems, and by heating the powder at the time of extrusion and degassing it at the same time, there are no bubble-like defects contained in the extruded material, and the structure is uniform. The present invention aims to provide a method for manufacturing continuous metal products that can easily produce extruded materials with strong metal bonding. The present invention uses a friction-driven extrusion device in which a conduit formed by a driving wall surface and a smaller fixed wall surface is a metal pressurized container, and from the front end of the conduit, powder-like or chip-like Al or A solid wall that constitutes a material heating device and a pressurizing device that heats Al or Al alloy small piece materials to 100°C or higher in a method of continuously extruding products of various cross-sectional shapes by supplying small pieces of Al alloy material. A deaerator is provided at a position before the extrusion grip zone where the extrusion pressure increases, and air, moisture, etc. contained in the small piece material are gasified by heating and extruded while being degassed. There is a method for manufacturing continuous metal products. The friction-driven extrusion device used in the present invention is an extrusion device configured to feed the raw metal and obtain extrusion pressure by friction with the raw metal caused by the drive of the side wall of the pipe. is a conforming device (Japanese Patent Application Laid-open No. 1989-1993) as shown in Fig. 2 and Fig. 6.
(see Wire Journal, April 1976 issue, p. 64), or a linex device in which the conduit is composed of opposing drive caterpillars and fixed walls on both sides, and the extrusion force is obtained by the drive caterpillars (see Wire Journal, April 1976 issue, p. 64). It is. The small piece metal material used in the present invention is a powder-like or chip-like material, and is made of Al or an alloy of Al. For example, Al or work-hardening or age-hardening additive elements such as Mg, Si, Fe,
It is made of an Al alloy containing Pb, Zr, Li, Cu, Au, Ag, Y, etc., and is manufactured by an atomized method, a pulverization method, etc. Hereinafter, the present invention will be explained by examples using the drawings. FIG. 2 and FIG. 6 are sectional views for explaining an embodiment of the method of the present invention, respectively. In the figure, the same reference numerals as in FIG. 1 indicate the same parts. The conformer shown in FIG. 2 includes a heater 12 as a material heating device on the outer periphery of the powder supply tool
A powder deaerator 13 is provided in the middle of the pipe line 6. This deaerator 13 removes the gas present between the powders 10 in the conduit 6 through a deaeration pipe 14 using a vacuum pump (not shown).
A filter 15 with holes smaller than the powder is provided at the inlet of the degassing pipe 14. Alternatively, an external filter may be provided before the vacuum pump for degassing. The conforming device shown in FIG. 6 is provided with an electrical heating device 22 as a material heating device.
The energization heating device 22 includes an electrode 23 in the powder supply tool 7,
A power supply roll 24 is provided near the exit of the extruded material 11, and an alternating current is passed between them to heat the extruded material 11 immediately after extrusion along with the powder 10. Further, a deaerator 13 similar to that shown in FIG. 2 is provided in the middle of the pipe line 6. Material heating device 1 in FIGS. 2 and 6
2 and 22 are for heating the powder 10 to remove moisture adsorbed to the powder, and since the electrical heating device 22 shown in FIG. 6 can also heat the extruded material 11 immediately after extrusion, the product cross-sectional area Even when the metallization ratio is large, the metal bonding between the powder materials becomes good, and a product with fewer defects can be obtained. The heating temperature of Al or Al alloy powder 10 using these methods is preferably 100°C or higher, usually 200° to 400°C. In order to prevent oxidation of the powder due to heating, the heating atmosphere is preferably a neutral atmosphere such as He or N ₂ gas or a reducing atmosphere containing H ₂ gas or the like. Note that since the powder is highly hygroscopic, in-line is preferable as mentioned above. The powder deaerator 13 shown in FIGS. 2 and 6 is
This is to eliminate gases such as air and water vapor existing between the Al or Al alloy powders 10. This degassing effect is further promoted by heating the powder. Degassing must be performed in the primary grip zone 16 (incomplete contact area between the material and the groove) before the extrusion grip zone 17 (e.g., about 5 cm) where the extrusion pressure increases; This is because the degassing in the erosion grip zone 17 is ineffective since the air bubbles are already contained therein, and since the mechanical strength of the filter 15 is low, the air bubbles are forced out from the degassing pipe 14. The inlet of the deaeration pipe 14 may be provided on the fixed wall surface 5 as shown in the figure, or may be provided on the powder supply tool 7 in front of it. Further, the number of deaerators may be one or more. Even if the above-mentioned heating and degassing are performed separately, the effect is low, but when they are performed simultaneously as in the present invention, the synergistic effect becomes remarkable. Next, a method for sealing the 6th section of the pipe will be described. The pipe line 6 section is evacuated by the deaerator 13 and therefore needs to be sealed. First, a scraper 18 is provided at the front end of the pipe line 6, and the scraper 18 is installed at the front end of the pipe line 6.
The A' section has a cross-sectional structure as shown in examples in Fig. 3A, Fig. 4A, and Fig. 5A, respectively. The scraper 18 is for removing Al or Al alloy flakes adhering to the outer periphery of the wheel 1.
Since it is installed with a slight clearance left on the groove surface 3, it also serves as a vacuum seal and prevents powder material from leaking. Preventing powder material leakage improves yield and work environment.
Note that a similar scraper 19 is provided in front of it if necessary. The B-B' cross section in the middle of the pipe line 6 is shown in Figures 3B and 4.
It has a cross-sectional structure as shown in examples in Figures 9 and 5, respectively. Here, each figure B corresponds to figure A. The cross-sectional shapes of the fixed wall surface 5 and the driving wall surface 3 are shaped to fit each other in order to form a vacuum seal, and the vacuum seal is formed by the flash produced during extrusion. Incidentally, in order to ensure a complete vacuum seal, the powder supply tool 7 may be sealed as shown in FIG. (Example) By the conventional method shown in FIG. 1 and the present invention method shown in FIG.
Al or Al alloy wire of mmφ was extruded. The powder is made by water atomization method, and the average particle size is
100 μm, and a filter 15 with a hole diameter of 50 μm was used, and a bag filter was also used as an external filter. Evacuation was performed using a conventional rotary pump. The diameter of the drive wheel 1 was 340 mm, and the rotation speed during extrusion was 5 rpm. The die temperature is 400 in the method of the present invention.
℃, which was 350℃ in the conventional method. The properties of the extruded material are shown in Table 1. The bending value is expressed by setting the bending diameter equal to the wire diameter, bending the wire alternately by 90° on the left and right sides, and counting the number of times it takes to bend 90° as one time until it breaks.

[Table] From Table 1, it can be seen that the method of the present invention produces extruded materials with no internal defects, blisters, or other defects compared to the conventional example, and with excellent bending values. (Effects of the Invention) The method of the present invention configured as described above has the following effects. (b) Using a friction-driven extrusion device as described above,
In a method of continuously manufacturing products with various cross-sectional shapes from small pieces of metal material, a material heating device and a deaerator are installed to extrude, so air and moisture contained in the small pieces of metal material are gasified by heating.
Since the gas is removed by degassing, air and moisture are not drawn into the extruded material, there are no defects such as voids inside the product, and there are no defects such as blisters on the surface, and the bending value, twisting value, etc. A product with improved toughness can be obtained. (b) Heating the material enhances the metal bonding effect between the small pieces of metal material, making the internal structure of the product uniform and improving its properties. (c) By heating the small pieces of metal material, the extrusion pressure is lowered, which improves the life of the extrusion die, reduces leakage of powdery material, and eliminates the need for preliminary operation for heating. , the yield of small piece metal materials has improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view for explaining an example of a method for manufacturing a linear body using a friction drive device. FIG. 2 and FIG. 6 are sectional views for explaining an embodiment of the method of the present invention, respectively. Figure 3A, Figure 4A, and Figure 5A are views showing examples of the A-A' cross section shown in Figure 2, and Figure 3B, Figure 4B, and Figure 5B are views showing examples of the A-A' cross section shown in Figure 2, respectively. FIG. 3 is a diagram showing an example of the BB′ cross section shown in FIG. 2; 1... Drive wheel, 2... Groove, 3... Drive wall surface (groove surface), 4... Fixed shoe block, 5...
Fixed wall surface, 6... Pipe line, 7... Powder supply tool, 8...
...Rear end, 9...Extrusion die, 10...Powder, 11
... Extruded material, 12 ... Heater, 13 ... Powder deaerator, 14 ... Deaeration pipe, 15 ... Filter, 16 ... Primary, grip zone, 1
7... Extrusion grip zone, 1
8, 19...Scraper, 22...Electrification heating device, 23...Electrode, 24...Power supply roll.

Claims (1)

[Claims] 1 Using a friction-driven extrusion device 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, granular or chip-shaped Al or Al is released from the front end of the pipe line. In a method of continuously extruding products of various cross-sectional shapes by supplying small pieces of alloy material, extrusion is performed using a material heating device that heats Al or Al alloy small pieces to 100℃ or higher and a fixed wall that constitutes a pressurized container. A continuous method characterized in that a deaerator is provided at a position before the extrusion grip zone where the pressure increases, and the air, moisture, etc. contained in the small piece material are gasified by heating and extruded while being degassed. Method of manufacturing metal products.