JP3201293B2 - Method and apparatus for manufacturing metal material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for producing high-quality metal using a rotary wheel type extruder.

[0002]

2. Description of the Related Art As shown in FIG. 1, a rotary wheel type extrusion system basically includes an outer circumferential groove 2 provided in a rotary wheel 1.
The metal material 6 is supplied to the passage 4 including the shoe block 3 and the metal material 6 is pressed against the damming projection 5 of the shoe block 3 by the contact friction force between the outer peripheral groove 2 and the metal material 6 to reduce the extrusion pressure. In this method, the metal material 8 is generated through a die 7 arranged in front of the damming projection 5.

As shown in FIG. 2, a gap of about 0.5 to 1 mm is provided between the outer circumferential groove 2 and the damming projection 5, and a metal material enters the gap and the outer circumferential groove is formed. 2
And a metal layer 9 is formed. The metal layer 9 has a role of preventing the outer circumferential groove 2 and the damping projection 5 from contacting and abrading, and a role of increasing frictional force for drawing in the supplied metal material 6.

[0004]

In the above method,
The rotating wheel 1 generates heat by the deformation heat of the metal material 6 and
Since the temperature becomes higher than 00 ° C., when the metal layer 9 attached to the outer peripheral groove 2 comes into contact with the atmosphere, its surface is instantaneously oxidized. If the oxidized metal layer is peeled off and is entangled with the newly supplied metal material 6 and extruded, the oxide remains as internal defects or surface defects, which may deteriorate the quality of the extruded material 8. .

It is an object of the present invention to provide a method and an apparatus capable of obtaining a high-quality metal material without inclusion of an oxide.

[0006]

The gist of the present invention is to extrude a rotating wheel coated with an inert gas or a reducing gas.

[0007] The passage from a predetermined position on the outer periphery of the rotating wheel
By coating with an inert gas or a reducing gas until the supply of the metal material to, the metal layer attached to the outer peripheral groove of the rotating wheel is blocked contact with the atmosphere, its
Oxidation by scraping the surface of the metal layer at the beginning of the gas coating section
No material is generated, and part of the metal layer is caught in the extruded material.
Even if it is, it will not be a defect.

The inert gas mentioned here includes not only a rare gas but also a gas which hardly reacts in a normal state such as a nitrogen gas for copper. In the case of reducing gas, the effect of preventing oxidation is greater than that of inert gas.
Higher quality extruded materials can be obtained.

If the surface of the metal layer adhering to the outer circumferential groove is removed by a scraper, it is only necessary to prevent re-oxidation after the removal, so that the range of gas coverage is reduced and efficiency is improved. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a manufacturing method according to the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows an apparatus according to a first embodiment of the present invention. The device comprises a rotating wheel 1 having an outer circumferential groove 2
A shoe block 3 having a passage 4 formed in contact with the outer periphery of the rotary wheel 1 and the outer peripheral groove 2 and having a damming projection 5 for damping the passage 4 and generating a pushing pressure; A die 7 arranged at the front of the damming projection 5, a scraper 10 inserted in the middle of the outer circumferential groove 2, and a space between the installation portion of the scraper 10 and the passage 4 are covered with an inert gas 12 such as an inert gas. A cover 11 is connected to a nitrogen gas supply source (not shown).

In the configuration of such an apparatus, the cover 1
1 and an inert gas 12 is blown into the wheel 1
Is rotated at a predetermined speed, and a linear metal material 6, for example, an aluminum rough wire is continuously supplied to the groove 2 of the rotating wheel 1 so that the metal material 6 4 and is extruded from a die 6 as an extruded material 8.

In this process, a thin layer 9 of a metallic material is formed on the inner surface of the outer circumferential groove 2 of the wheel 1 which has passed through the damming projection 5.
Is formed and reaches the supply side of the material 6 in a state where the surface is oxidized in contact with the atmosphere. However, the metal layer 9 is oxidized on the surface by a scraper 10 on the way, and the metal layer 9 is converted into an inert gas immediately thereafter. Since it reaches the passage 4 together with the new material 6 while being covered, even if a part of the metal layer 9 is peeled off after being passed through the scraper 10 and gets caught in the extruded material 8, no problem occurs, and high quality extrusion is performed. To get the material.

In this embodiment, a scraper 10 is installed on the way, and a part of the outer periphery of the wheel 1 is covered with a gas 12. However, the scraper 10 is omitted and most of the periphery of the wheel 1 is covered with a gas. Alternatively, the entire extruder may be coated with gas in some cases.

In this embodiment, one wheel is provided with one outer circumferential groove, but one wheel is provided with a plurality of outer circumferential grooves and a plurality of passages are gathered and extruded. The present invention is also applicable to a type in which two wheels each having one outer circumferential groove are arranged symmetrically in the vertical direction, and the passages are gathered and extruded in the middle between them.

Although the above-described embodiment shows a solid extruded material 8, the extruded material 8 may be a hollow material, a solid material, or a composite material having a core.

[0017]

As is apparent from the above description, since the present invention is a system in which at least a part of the rotating wheel is coated with an inert gas or a reducing gas and extruded, the rotating wheel is attached to the outer peripheral groove of the wheel. Even if a part of the metal layer is peeled off and gets caught in the extruded material, there is no oxide and there is an advantage that a uniform and high-quality extruded material can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an apparatus according to an embodiment of a method of the present invention.

FIG. 2 is an explanatory view in which a cross section of a part of the apparatus of FIG. 1 is enlarged.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotating wheel 2 outer peripheral groove 3 shoe block 4 passage 5 damming projection 6 metal material 7 die 8 extruded material 9 metal layer 10 scraper 11 cover 12 inert gas

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 23/00-35/06

Claims (2)

(57) [Claims] 1. A metal material is supplied to a passage formed by an outer peripheral groove and a shoe block provided in a rotating wheel, and the metal material is sent to the inner side of the passage by a contact friction force between the outer peripheral groove and the metal material. a method for producing the extruded material through a die which arranged behind the passage, the outer circumference of the rotating wheel
From a predetermined position to a supply portion of the metal material to the passage.
Between coated with an inert gas or a reducing gas, said plant localization
The surface of the metal layer attached to the outer circumferential groove of the rotating wheel
A method for producing a metal material, comprising: 2. An outer peripheral groove provided on a rotating wheel and a shoe blower.
A metal material is supplied to a passage made of
The metal material is sent deep into the passage by the contact frictional force of the metal material.
Presses a metal material through a die arranged at the back of the passage.
An apparatus for producing a design, supply of the metal material to the passageway from a predetermined position on the outer circumference of the rotating wheel or
Gas covering means with inert gas or a reducing gas between at
The a apparatus for manufacturing a metallic material characterized by comprising placing a scraper scraping the surface of the deposited metal layer <br/> that the peripheral groove of the rotating wheel to the predetermined position.