JP2002102919A - Method for manufacturing microcrystal metallic stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a microcrystal metallic stock capable of performing an efficient and long continuous work when an obtainable micro-crystal metallic stock is applied for the manufacture of wire and bar stock. SOLUTION: In the passage 5 formed by an outer circumferential groove 3 of a rotating wheel 2 and a shoe block 4 which covers the groove 3 over the prescribed circular arc length of the rotating wheel 2, the metallic stock is retracted through a revolution of the rotating wheel 2 and by pressing the wheel to the abutment 6 for damming in the rear of the passage 5, the pressure is increased and the rotating wheel type extruders 1a to 1d composed so as to extrude from the die 7 with the pressure are arranged tandem. By getting the aligned extruders 1a to 1d through the metallic stock 8a for extruding as a working object, the metallic stock 8b, 8c... is processed in turn and by imparting distortion force repeatedly during the process, a metallic stock 8e with finer crystals is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fine crystalline metal material, and more particularly, to performing an efficient long continuous operation when the obtained fine crystalline metal material is applied to manufacture of a striatum. The present invention relates to a method for producing a microcrystalline metal material that can be used.

[0002]

2. Description of the Related Art Metals have a property of improving properties such as strength and elongation by refining crystal grains. Conventionally, as a method for realizing this, ECAP (E
qual-channel Angular Pres
sing) method is known.

FIG. 4 shows an outline of the ECAP method. Mold 11
Holes 12 and 13 of the same size are formed crossing each other, and a metal material 14 is pushed in from one hole 12 by a press ram 15 and pushed out from the other hole 13.
The strain force due to the shearing deformation 17 based on 6 is applied to the metal material 14 to thereby refine the crystal grains. According to this method, a large strain force can be added by repeatedly passing a metal material, and the metal crystal has a feature that can be refined to a stage that cannot be reached by ordinary rolling, extrusion or drawing. It is utilized as an effective method for producing fine crystalline metal materials.

[0004]

However, the conventional ECA
According to the method for producing a microcrystalline metal material by the P method, the microcrystalline metal material obtained by this method has a bulk shape. The length is determined by the bulk capacity, so
The length of the striated body that can be manufactured continuously is limited, which is disadvantageous in efficiency. Although it is conceivable to increase the size of the bulk, it is not practical due to restrictions on equipment, and the repeated injection of a large bulk into the mold causes a reduction in work efficiency due to its poor handling. Leads to
This is not a realistic solution.

Accordingly, an object of the present invention is to provide a method for producing a fine crystalline metal material capable of performing an efficient long continuous operation when the resulting fine crystalline metal material is applied to the production of a striatum. To provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a fine crystalline metal material which is processed into a metal material having fine metal crystals by applying a strain force to the metal material. In the manufacturing method, the rotating wheel is provided in a passage formed by a groove formed on an outer periphery of a rotating wheel rotating in a predetermined direction and a shoe block for covering the groove over a predetermined arc length of the rotating wheel. The metal material is drawn by the rotation in the predetermined direction, and the drawn metal material is pressed against a damming projection formed at the back of the passage by the rotation of the rotating wheel in the predetermined direction to reduce the pushing pressure. The extruding process of generating and extruding the metal material from the die arranged at the subsequent stage of the damming projection by the extrusion pressure is repeated for the metal material to be processed. There is provided a method for producing a fine crystal metal material characterized by applying.

In the manufacturing method of the present invention, it is preferable to set the conditions as follows. First, the cross section of the metal material drawn into the passage and the metal material extruded from the die is preferably the same size. When both are set in this way, the rotating wheel is again processed without processing the extruded metal material. To extrude.

[0008] In addition, in order to apply a sufficient strain force to the metal material based on securing the bending angle at the lower limit, and to ensure good extrudability at the upper limit, the extruding direction from the die is limited. It is preferable to set the angle formed by the right-angled direction and the pressure-receiving surface against which the metal material of the damming projection is pressed within the range of 45 to 135 °. It is preferable to repeat at least three times in order to realize a highly fine metal crystal by applying a sufficient strain force.

In many cases, the number of the rotary wheel type extruders used in the present invention is prepared in accordance with the number of times of the extruding process performed on the metal material to be processed, but one extruder is prepared. Then, what is extruded from the metal material to be processed supplied thereto is supplied again to this extruder, and thereafter, a circulation type embodiment in which this is repeated a predetermined number of times is also possible. Economic benefits can be obtained by reducing equipment costs and equipment space. In many cases, copper or aluminum is used as the metal material to be processed.

[0010]

Next, an embodiment of a method for producing a fine crystalline metal material according to the present invention will be described. FIG. 1 shows an equipment configuration in the present embodiment in which four rotating wheel type extruders 1a to 1d are arranged in a tandem type.
In the figures, 2 is a rotating wheel, 3 is a groove formed on the outer periphery thereof, 4 is a shoe block for covering the groove 3 over a predetermined arc length of the rotating wheel 2, and between the groove 3 and the shoe block 4. , A passage 5 is thereby formed. Reference numeral 6 denotes a damming projection formed at the back of the passage 5, 7
Denotes a die which is communicated with the passage 5 and is arranged at a stage subsequent to the damming projection 6.

The metal material 8a to be processed is drawn into the passage 5 by the rotation of the rotary wheel 2 in a predetermined direction, and the drawn metal material 8a advances while rubbing with the passage 5 and is moved to the damping projection 6. Pressed. Metal material 8a
The pressure is raised by pressing against the damming projections 6 and is extruded from the die 7 based on this pressure.

The extruded metal material 8b is cooled to a predetermined temperature by cooling water 9, thereby suppressing excessive growth of crystal grains, and then supplied to the next extruder 1b having the same configuration. The supplied metal material 8b is similarly extruded from the extruder 1b as a metal material 8c, and hereinafter, the metal material is extruded from the extruder 1c as a metal material 8d and the extruder 1b.
d extrudes as a metal material 8e. In the final metal material 8e, four strain forces applied while passing through the extruders 1a to 1d will be integrated, and therefore,
The crystal grains of the metal material 8e are extremely fine.

According to the present embodiment, as long as the metal material 8a to be processed is not interrupted, the metal material 8e as a finished product can be manufactured without limitation in length. When used as raw material for manufacturing, E
Unlike when using bulk raw materials by the CAP method, continuous production is possible without restriction on the production length.
Highly efficient striated body manufacturing operations can be performed.

The manufacturing equipment for processing the metal material 8e into a striated body may be directly connected with a line balance after the extruder 1d in FIG. 1 or is not related to the line in FIG. You may install in another process. In the former case,
The work efficiency until completion of the striatum will be higher.

FIG. 2 shows a configuration of a rotary wheel type extruder suitable for use in the embodiment of FIG. Direction B perpendicular to extrusion direction A from die 7
And the effect of the angle θ formed by the pressure-receiving surface 11 against which the metal members 8a to 8d of the damming projections 6 are pressed. The angle θ may be set in a range of 45 to 135 °. preferable.

The setting of the angle of less than 45 ° depends on the metal material 8a
The bending angle with respect to the flow of 8d becomes insufficient, so that it is difficult to obtain a strain force applied to the metal materials 8a to 8d, and the degree of miniaturization of the obtained metal crystal is limited. On the other hand, when the angle is set to more than 135 °, the distortion force is increased due to the increase in the angle, but the flow of the metal materials 8a to 8d is deteriorated, and the extrudability of the core is impeded, making it difficult to perform a smooth operation. I do. In implementing the present invention, consideration should be given to the angle θ.

FIG. 3 shows another embodiment of the present invention.
The features of this embodiment are that the number of rotary wheel type extruders is reduced to a minimum of one, and that a metal material to be processed is repeatedly processed by the single extruder. That is, the metal material 8 extruded from the extruder 1 having the same configuration as in FIG.
Is passed through the accumulator 10 and then introduced into the extruder 1 again. In this way, as a result of this line configuration, it is possible to perform repetitive processing without being restricted by the number of extruders. Compared with the embodiment shown in FIG. 1, there is an advantage that the equipment cost is lower and the equipment space is reduced.

In the above two embodiments,
An embodiment in which the extrusion temperature in the extruders 1a to 1d or 1 is set to be equal to or lower than the dynamic recrystallization temperature and static recrystallization is performed by reheating after each extrusion is possible.

[0019]

As described above, according to the method for manufacturing a microcrystalline metal material according to the present invention, the groove formed on the outer periphery of the rotating wheel rotating in the predetermined direction and the predetermined arc length of the rotating wheel are formed. The rotation of the rotating wheel pulls the metal material into the passage formed by the shoe block and the shoe block that covers the groove, and the drawn metal material is pressed against the damming projection formed at the back of the passage by the rotation of the rotation wheel. Since the extrusion pressure is generated and the extrusion pressure is used to repeatedly extrude the metal material from the dies arranged behind the damming projections on the metal material to be processed, supply of the metal material to be processed is interrupted. It is possible to obtain a long continuous microcrystalline metal material as long as it is not used.
Unlike the case of using a bulk metal material by processing, there is no restriction on the production length due to the capacity limitation of the raw material, and a long continuous production operation can be performed with high efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a method for producing a microcrystalline metal material according to the present invention.

FIG. 2 is an explanatory view showing a rotating wheel type extruder having a preferred configuration in the present invention.

FIG. 3 is an explanatory view showing another embodiment of the method for producing a microcrystalline metal material according to the present invention.

FIG. 4 is an explanatory view showing a conventional method for producing a microcrystalline metal material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a-1d Rotating wheel type extruder 2 Rotating wheel 3 Groove part 4 Shoe block 5 Passage 6 Dam for dam 7 Dice 8a Metal material to be processed 8, 8b-8e Metal material 9 Cooling water 10 Accumulator

Claims (5)

[Claims] 1. A method for producing a fine crystal metal material, wherein a metal material is processed into a metal material having fine metal crystal grains by applying a strain force to the metal material. By rotating the rotating wheel in the predetermined direction, the metal material is drawn into the passage formed by the formed groove and the shoe block that covers the groove over a predetermined arc length of the rotating wheel. The metal material is pressed against a damming projection formed at the back of the passage by rotation of the rotating wheel in the predetermined direction to generate an extruding pressure, and the extruding pressure causes the metal material to move toward the damming projection. A method of manufacturing a microcrystalline metal material, wherein extrusion processing extruding from an opening of a die arranged at a later stage is repeatedly performed on a metal material to be processed. Law. 2. The extrusion process according to claim 1, wherein the cross section of the metal material extruded from the die has the same size as the cross section of the metal material drawn into the passage. Production method of fine crystalline metal material. 3. An extrusion process according to claim 1, wherein an angle formed by a direction perpendicular to the direction of extrusion from said die and a pressure receiving surface of said damming projection against which said metal material is pressed is 45.
2. The method for producing a fine crystalline metal material according to claim 1, wherein the method is performed under a condition set at ~ 135 [deg.]. 4. The method according to claim 1, wherein the extrusion is repeatedly performed on the metal material to be processed three times or more. 5. The method according to claim 1, wherein the extrusion is repeatedly performed on the metal material to be processed by returning the metal material extruded from the die to the passage. The method for producing a fine crystalline metal material according to the above.