JPS59113920A - Continuous manufacture of metallic product - Google Patents

Abstract

PURPOSE:To manufacture an extruded material having an uniform structure free from bubbles continuously and easily in pressing powdery fine metallic material to a wire-shaped body in a conduit formed by a driving wall face and a fixed wall face by pressing the material after heating and deaeration. CONSTITUTION:A conduit 6 is formed by the wall face 3 of a groove 2 of a driving wheel 1 and a fixed wall face 5 of a fixed block 4. Metallic powder 10 is supplied from a powder supplying device 7 continuously to the conduit 6 and sent to the rear end of the conduit 6. Extruding pressure is applied gradually and the powdery body is extruded from an extruding die 9 as a wire-shaped body 11. At this time, the powdery body 10 is heated to above 100 deg.C, preferably to 200-400 deg.C by a heater 12 in the supplying device 7 to gasify moisture etc. contained. Air, water vapor etc. existing in the powdery body 10 are sucked and excluded by the pipe 14 of a deaeration device 13 before the extrusion grip zone 7 where extruding force is increased.

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 technology) In recent years, friction-driven extrusion devices have been developed (for example,
No. 7-11859, etc.), aluminum, copper, or their alloys. Conventionally, in order to manufacture a linear body from alloy powder such as Aβ using this device, the first
The method shown in the example in the figure was adopted.

In the figure, a conduit 6 is formed by a drive wall surface (groove surface) 8 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 A1 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 metal-bonded with alloy powders such as A1 due to friction within the pipe line 6, heat generated by processing, and extrusion pressure.

However, in this method, gas (0, N), moisture (H2O), 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 is / to generate 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. . Moreover, alloy powders such as AAi have very high water absorption properties, and if left in the atmosphere, they will contain a large amount of water, which will exacerbate the above-mentioned drawbacks.

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 simultaneously heating and deaerating the powder during extrusion,
It is an object of the present invention to provide a method for manufacturing a continuous metal product that can easily produce an extruded material that has no bubble-like defects contained in the extruded material, has a uniform structure, and has strong metal bonding.

The present invention uses a friction-driven extrusion device in which a pipe line formed by a driving wall surface and a fixed wall surface having a smaller area is used as a pressurized metal container, and a powder or chip-shaped extruder is produced from the front end of the pipe line. This is a method for continuously manufacturing products of various cross sections by supplying small pieces of metal material, characterized in that a material heating device and a degassing device are provided for extrusion.

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 due to the drive of the side wall of the pipe,
Specifically, a conforming device as shown in FIGS. 2 and 6 (see Japanese Patent Laid-Open No. 47-31859), or a system in which the conduit is constituted by opposing drive caterpillars and fixed walls on both sides. , a Linex device (see Wire Journal, April 1976 issue, p. 64) that obtains the extrusion force by a driving caterpillar.

The small metal particles used in the present invention are 1131 in the form of powder or chips, and are made of A7, Cu, etc., or alloys thereof. For example, Al or work-hardening or age-hardening additive elements, such as Mg* S r + Fe*
P b *Zr, ICCu, Au, AIL Y
It is made of h1 alloy, etc., including atomized method,
Those manufactured by a pulverization method or the like are used.

Hereinafter, the present invention will be explained using an example of using hll or h(1 alloy powder), but the present invention is not limited thereto.

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 Figure 5-5, the same reference numerals as in Figure 1 indicate the same parts.

The conform device shown in FIG. 2 is provided with a heater 12 as a material heating device on the outer periphery of the powder supply tool 7, and a powder deaerator 13 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 deaeration.

The conforming apparatus shown in FIG. 6 is provided with an electrical heating device 22 as a material heating device. Electric heating device 2
2 has an electrode 23 inside 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.

The material heating device in Figures 2 and 6 (12°22
) is for heating the powder 10 to remove moisture adsorbed to the powder, and since the electric heating device 22 shown in FIG. 6 can also heat the extruded material 11 immediately after extrusion, product breakage is avoided. Even when the area is large, the metal bonding between the powder materials becomes good, and a product with fewer defects can be obtained.

The heating temperature of the A/(or A4 alloy powder IO) by these methods is preferably 100°C or higher, usually 200° to 400°C.Also, in order to prevent the powder from oxidizing due to heating, the heating atmosphere is H
e, a neutral atmosphere such as N2 gas or a reducing atmosphere containing H2 gas or the like is desirable. 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 for removing gases such as air and water vapor existing between the HP or A1 alloy powders 10. This degassing effect is further promoted by heating the powder. Degassing occurs at extrusion grip zone 17 (e.g. 5
It is necessary to perform degassing in the grip zone 16 (area of incomplete contact between the material and the groove) before the extrusion grip zone 17, since air bubbles are already contained inside. This is because the filter 15 is not effective, and because the mechanical strength of the filter 15 is low, it ends up being pushed 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 souffle flavor bar 18 is provided at the front end of the conduit 6, and examples of the A-A' cross section of that part are shown in Fig. 3 (a), Fig. 4 (a), and Fig. 5 (a), respectively. It has a cross-sectional structure as shown. The sour flavor 18 is for removing Ag or AA) alloy flash (dross) attached to the outer periphery of the wheel l, and is installed with a slight clearance left on the groove surface 3, so at the same time, the vacuum seal, It plays a role in preventing powdery material from leaking. Preventing powder leakage improves yield and work environment. If necessary, a similar souffle flavor 19 is provided in front of it.

The BB' cross section in the middle of the pipe line 6 is shown in Figure 8 (B) and Figure 4 (
(b) and FIG. 5(b) each have a cross-sectional structure, examples of which are shown in FIG. Here, each figure (b) corresponds to figure (a). The fixed wall surface 5 and the driving wall surface 8 have cross-sectional shapes that fit into each other for vacuum sealing, and the vacuum seal is achieved 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 method of the present invention shown in FIG. 6, 8 mmφ was obtained from powder having the composition shown in Table 1.

An A/or Ag alloy wire with a diameter of 6 mm was extruded. The powder is made by water atomization method, and the average particle size is 100 μm.
In this case, a filter 15 with a hole diameter of 50 μm is used.
In addition, a bag filter-9- was used as an external filter. Evacuation was performed using a regular rotary pump.

The diameter of the drive wheel 1 was 340 groups, and the rotation speed during extrusion was 5 rpm. The die temperature was 400°C in the method of the present invention and 350°C in the conventional method.

The properties of the extruded material are shown in Table 1. The bending value is expressed as one bending diameter equal to the entire wire diameter, bending alternately at 90 degrees left and right, and a total of 906 bends until breaking.

Table 1 10- From Table 1, it can be seen that the method of the present invention provides an extruded material with no internal defects, blisters, or other defects compared to the conventional example, and with an excellent bending value.

(Effects of the Invention) The method of the present invention configured as described above has the following effects.

(B) In the method of continuously manufacturing products with various cross-sectional shapes from small pieces of metal material using a friction-driven extrusion device as described above, a material heating device and a degassing device are provided for extrusion. Air, moisture, etc. contained in the material are gasified by heating, and the gas is removed by degassing.
Air, moisture, etc. are not entangled in the extruded material, there are no defects such as voids inside the product, there are no defects such as blisters on the surface, and a product with improved toughness such as bending value and twisting value can be obtained.

(b) Heating the material increases the effect of metal bonding between the small pieces of metal material, making the internal structure of the product uniform and improving its properties.

(c) By heating the small piece metal material, the extrusion pressure is lowered, which improves the life of the extrusion die, reduces leakage of powder, and eliminates the need for preliminary operation for heating. As a result, the yield of small piece metal materials has improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view illustrating an example of a method for manufacturing a linear body using a friction drive device. 2 and 6 are sectional views for explaining the present invention in detail, respectively. Figure 3 (a), Figure 4 (a), and Figure 5 (a) are diagrams showing examples of the A-A' cross section shown in Figure 2, respectively, and Figure 3 (b) and Figure 4 ) and Figure 5 middle) are B shown in Figure 2, respectively.
It is a figure showing an example of -B' cross section. DESCRIPTION OF SYMBOLS 1... Drive wheel, 2... Groove, 3... Drive wall surface (groove surface), 4... Fixed shoe block, 5... Fixed wall surface, 6... Conduit, 7... Powder supply tool, 8... Rear end, 9... Extrusion die, IO... Powder, 11...
Extruded material, 12... Heater, 18... Powder deaerator, 14... Deaeration pipe, 15... Filter, 16
...Primary, grip zone, 17.. Extrusion grip zone, 18.19.. Sprayer, 22.. Current heating device, 23.. Electrode, 24.. Power supply roll. 13-

Claims (1)

[Scope of Claims] (1) A friction-driven extrusion device in which a conduit formed by a driving wall surface and a fixed wall surface having a smaller area is used as a metal pressurized container is used, and powder is removed from the front end of the conduit. A method for manufacturing continuous metal products by supplying small pieces of metal material in the form of granules or chips, and continuously manufacturing products with various cross-sectional shapes, characterized by extruding by providing a material heating device and a deaeration capacity. (2) The material heating device heats the small piece metal material to 100° C. or higher. (3) The deaerator is provided before the extrusion grip zone where the extrusion pressure increases. A method for manufacturing continuous metal products.