JP2002224735A - Metal processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal processing method that prevents poor appearance or broken wire from occurring due to insufficient application of lubricant to a metal work surface or owing to dirty surface of the metal work when cold processing a metal, especially cold rolling or cold drawing of wire. SOLUTION: The metal processing method has a feature that it cold-processes a metal applying lubricant to the work surface after performing plasma treatment on the work surface. The metal processing method has another feature that such a cold processing is applied to rolling or drawing of wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for processing a metal material,
In particular, it relates to cold working.

[0002]

2. Description of the Related Art Conventionally, when cold working a metal material,
Lubricants are used to reduce friction between metal materials and rolling rolls, drawing dies, extrusion dies, etc., prevent poor surface appearance of metal materials, prevent deterioration of properties, and extend the life of rolling rolls, drawing dies, extrusion dies, etc. Cold working is performed while applying to the material surface.

Generally, when a metal material is left in the air, it reacts with moisture in the air to form a thin oxide film on the surface. In addition, an oxide film is formed on the surface of the heat-treated metal material, and after the heat treatment, an oxide film, water, and dirt are formed on the surface of the metal material that has been subjected to a solution treatment or quenching to be rapidly cooled. Adhered to the surface. When a lubricant is applied to the surface of such a metal, the lubricant does not sufficiently adhere to the surface of the metal material depending on the material having poor wettability with the lubricant or the surface condition (the lubricant is repelled on the metal surface). In some cases, the lubricant does not adhere to the surface of the metal. When the lubricant is not sufficiently applied, the portion is rolled using a rolling roll or a drawing die. And the rolled surface is scratched, resulting in poor appearance, disconnection and the like, resulting in a reduction in product yield. In addition, when such metal materials are rolled or drawn, the life of the rolling rolls and drawing dies is shortened, and the rolling rolls and drawing dies need to be changed frequently, resulting in reduced work efficiency. was there. Further, if the metal surface before the cold working has dirt or the like, not only does the lubricant hardly adhere, but also various quality defects due to the surface dirt have occurred.

[0004] Since what is manufactured by rolling or drawing is generally a long continuous body, even at one place over the entire length, the appearance is poor, and if a wire breaks, it cannot be used as a product. It greatly affects efficiency and cost.

In recent years, in particular, in recent years, there has been a demand for weight reduction of electronic devices and the like. Therefore, naturally, parts used in the electronic devices and the like have naturally been required to be reduced in weight. Against this background, there is an increasing demand for thinner and thinner final forms such as foil films in rolling and extra fine wires in wire drawing.

However, as the final form becomes thinner and thinner, the wettability between the lubricant and the metal material and the dirt on the surface of the metal material become less apparent due to scratches generated on the metal surface after cold working. There is a problem that the product yield is extremely reduced because it greatly affects the incidence of defects and disconnections.

[0007]

SUMMARY OF THE INVENTION The present invention relates to the wettability of a lubricant used in cold working, particularly rolling and wire drawing, of a metal material with a metal material and the contamination of the surface of the metal material. It is an object of the present invention to provide a method of processing a metal material that does not cause poor appearance or disconnection caused by the problem.

[0008]

SUMMARY OF THE INVENTION The present invention improves the wettability between a metal material and a lubricant used in cold working, especially cold rolling and cold drawing, the metal material. It is intended to provide a method for processing a metal material which does not cause poor appearance or disconnection by removing surface dirt.

That is, the object of the present invention is to provide a method of working a metal material, which comprises applying a lubricant to the surface of the metal material and subjecting the surface to cold working after plasma treatment. Alternatively, the problem is solved by a metal material processing method characterized by wire drawing.

[0010]

In the method of processing a metal material according to the present invention, the surface of the metal material before cold working is subjected to plasma treatment, thereby producing a stain or a naturally formed oxide film, heat treatment or rapid cooling after heat treatment. The oxide film and dirt are removed. As a result, there is no dirt or oxide film on the entire surface of the metal material, and an active surface having a high surface energy is obtained, so that the effect of improving the wettability of the lubricant on the surface of the metal material is used.

[0011]

DETAILED DESCRIPTION OF THE INVENTION There are no restrictions on the components or compositions of the materials to be cold worked in the present invention. There is no particular limitation on the processing method, but it is particularly effective for rolling and wire drawing, in which lubrication is important. The shape before and after the cold working may be in any form such as a line, a plate and a strip.

The plasma processing is performed before the cold working, and the plasma is generated by irradiating the surface of the metal material with a gas converted into a plasma by a general discharge type plasma generator. There is no particular limitation on the gas for generating plasma, and air, nitrogen, various inert gases, and the like can be used. Among them, air or nitrogen is most suitable in terms of cost and maintenance.

The pressure of the plasma may be atmospheric pressure, but may be reduced if the irradiation area is to be increased. However, in this case, since a decompression chamber is required, it is desirable to perform the treatment at a long atmospheric pressure when processing a long product (continuous body) such as a wire or a strip.

Although there is no particular limitation on the plasma irradiation time,
From the viewpoint of the irradiation effect, 0.1 second or more, preferably 0.5 second or more is desirable. Also, if the surface activated by this plasma irradiation is left as it is, the degree of activation of the surface is reduced or the contamination of the surface is advanced. Therefore, cold working is performed while applying a lubricant from the plasma treatment. The shorter the time, the better. Ideally, it is desirable to carry out cold working continuously while applying lubricant immediately after plasma treatment.At the longest, apply lubricant within several hours after plasma irradiation. It is desirable to cold work.

The lubricant used in the cold working is not particularly limited, but a generally known emulsion lubricant or mineral oil lubricant may be used.

The method of applying the lubricant to the surface of the metal material and performing cold working is not particularly limited. For example, a method of immersing the metal material in a bath containing the lubricant and immediately performing the cold working may be used. A method in which a sufficient amount of the lubricant is evenly dropped on the surface of the metal material and then cold working is performed immediately is applied.

[0017]

EXAMPLES Table 1 shows Examples 1 to 7 and Comparative Example 1 according to the present invention.
5 shows the processing conditions and evaluation results. In Examples 1 to 7, plasma processing was performed before cold working. The plasma treatment was performed using a commercially available discharge plasma generator, the pressure was set to atmospheric pressure, the gas used, and the treatment time were set under the conditions shown in Table 1.
Immediately after the plasma treatment, cold working was performed. Comparative Examples 1 to
In No. 5, cold working was performed directly without plasma treatment.
The lubricant used in cold working is an aluminum-based material. For SUS and nickel, a commercially available mineral oil-based lubricant (Kolex manufactured by Kogi Oil Co., Ltd.) is used. For the copper-based material, a commercially available emulsion-based lubricant is used. (A Horton draw drawer) was used. The lubricant was applied by evenly dropping a sufficient amount of the lubricant on the metal surface.

(1) Example 1 and Comparative Example 1: A 6061 aluminum alloy rough drawn wire (φ
9.5 mm) (solution treatment conditions: 550 ° C.)
And then immediately quenched in a water bath having a water temperature of 20 ° C. or lower), left in the air for 2 days to remove attached moisture by natural drying, and in Example 1, the plasma treatment was continuously performed. After implementation, a wire having a diameter of 3.0 mm was formed by wire drawing, and in Comparative Example 1, a wire having a diameter of 3.0 mm was directly formed without plasma treatment. (2) Example 2 and Comparative Example 2: A 6101 aluminum alloy rough drawn wire (φ9.5 mm) manufactured by a continuous casting and rolling method was subjected to a solution treatment (solution treatment condition: at 550 ° C. for 10 hours, and immediately after the water temperature was reached). What was quenched in a water bath of 20 ° C. or less) was left in the air for 2 days to remove attached moisture by natural drying. In Example 2, plasma treatment was continuously performed, and then φ3 was obtained by wire drawing. In the case of Comparative Example 1, the wire was directly drawn without a plasma treatment in a diameter of 3.0 mm.
m. (3) Example 3 and Comparative Example 3: J manufactured by hot rolling
A 6061 aluminum alloy plate (thickness 5 mm × length 1000 mm × width 300 mm) described in IS H 4000 is solution-treated (solution-treatment condition: maintained at 550 ° C. for 10 hours, and then immediately quenched in a water bath having a water temperature of 20 ° C. or less. The sample was left in the air for 2 days to remove adhering water by natural drying. In Example 3, plasma treatment was continuously performed, and then a 2 mm-thick strip was formed by rolling. In No. 3, a strip having a thickness of 2 mm was formed directly by rolling without plasma treatment. (4) Example 4: thickness of 5 mm × length of 100 after heat treatment (heat treatment condition: 400 ° C. × 4 hours) to make O material
Oxygen-free copper plate material having a size of 0 mm x a width of 400 mm was continuously subjected to plasma treatment, and then rolled into a 2 mm-thick strip. (5) Example 5: φ8 mm manufactured by continuous casting and rolling method
After continuous plasma treatment of tough pitch copper,
A wire having a diameter of 2.6 mm was formed by wire drawing. (6) Example 6 and Comparative Example 4: SUS30 subjected to a heat treatment (heat treatment condition: 800 ° C. × 3 hours) to obtain an O material
After plasma treatment was continuously performed on the 4-wire material (φ3 mm), a wire having a diameter of 0.5 mm was formed by wire drawing. (7) Example 7 and Comparative Example 5: A pure nickel wire (φ3 mm) having a purity of 99.5% was plasma-treated continuously in Example 7, and then a wire having a diameter of 0.5 mm was drawn by a roller die. In Comparative Example 5, 0.5 m was drawn directly by a roller die without plasma treatment.
m.

[0019]

[Table 1]

The lubricating effect was evaluated by visually observing the surface of the material after cold working for flaws or seizure. If the flaw or seizure was confirmed, the result was x.
Was evaluated.

[0021]

According to the cold working method of the present invention, stable cold working can be performed even on a material having a poor wettability of a lubricant and an unstable surface property, and the surface property after the processing is remarkable. improves. In addition, since the surface dirt is removed by the plasma treatment before the processing, it is not necessary to perform cleaning using an organic solvent or the like before and after the processing.

Claims (2)

[Claims] 1. A method of processing a metal material, comprising applying a lubricant to the surface of the metal material after performing a plasma treatment and cold-working the lubricant. 2. The method according to claim 1, wherein the cold working is rolling or drawing.