JPS60177185A - Lubrication treatment method for steel wire - Google Patents

Abstract

PURPOSE:To improve the lubricity of the surface of a steel wire by pickling the steel wire, treating it with a specified aqueous phosphate soln. to form an iron phosphate film on the surface of the steel wire, and applying a lubricating agent. CONSTITUTION:A steel wire is pickled with sulfuric acid or the like to condition the surface, and it is treated with an aqueous phosphate soln. of 3.0-6.5pH contg. an alkali phosphate such as sodium phosphate or ammonium phosphate as a base to form an iron phosphate film on the surface of the steel wire by about 1-5g/m<2>. It is preferable that molybdate ions are added to the phosphate soln. by about 0.01-5g/l. A lubricating agent such as lime soap or oil is then applied.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides 15 steps prior to the step of drawing a steel wire by header processing.
, J. Ruchino, relates to a steel wire lubrication treatment method that improves the lubricity of the steel wire surface.

[Prior art] Generally, when drawing a WA wire, a phosphate film is applied to the surface of the steel wire in advance, and then the film is further immersed in an aqueous solution of an IF, 1M agent, such as sodium stearate, to react. There is a method of forming a lubricating layer to improve lubricity.

The phosphate film used here is generally a zinc phosphate film with a rating of 7 to 1! A film of l/u' is formed on the surface of the steel wire. However, when processing steel wire, especially small-diameter steel wire lifting platforms and headers, the zinc phosphate coating is crystalline and easily falls off from the steel wire surface, and the zinc phosphate coating along with the fallen lubricant. Sludge accumulates in the header machining tool, which may cause dimensional changes in the header workpiece.
There was a drawback that the header machining tool had to be cleaned frequently. To prevent this, phosphate treatment can be omitted and only lime soap or borax can be applied, but in reality, the corrosion resistance is only poor, and the T8 slipperiness is also lower than that of phosphate treatment. It was quite inferior and was not preferred in the wire drawing process.

In addition, with conventional zinc phosphate coatings, the pH of the processing solution is 2 to 3, so there is a lot of etching on the workpiece. At the same time, since the film is thick, it also has the disadvantage of increasing consumption of 85 items.

In addition, 1. A method has been disclosed in which a steel wire is mechanically descaled and further treated with phosphorus before being wiredrawn, but according to this method, an iron phosphate film is formed on the surface of the steel wire, but it is not a film type♀
It is extremely thin with a thickness of 0.1 to 0.8 (1/+n'), and has the drawbacks of not only lacking in corrosion resistance but also poor lubricity.

[Object of the Invention] The present invention has been made to eliminate these drawbacks, and the purpose is to provide a method for lubricating steel wire with a thin film thickness and excellent corrosion resistance and lubricity. It is something that

[Structure of the Invention] The present invention, which has been made to achieve the above-mentioned object, is to prepare a steel wire with an alkali metal phosphate or an ammonium phosphate-based J-p113°O~ after surface-conditioning the steel wire by pickling.
6.5 A steel wire lubrication treatment method comprising treating the steel wire with an aqueous phosphate solution to form an iron phosphate film on the surface of the steel wire, and then applying a lubricant, the method comprising: By treating with the liquid, the film weight of the iron phosphate film formed on the surface of the steel plate is about 1.5 to 3.5 g/T [12], and it forms a film with a large film weight for an iron phosphate film. Therefore, a lubrication treatment method with high corrosion resistance and lubricity has become possible.The lubricating film formed by the method of the present invention is extremely unlikely to peel off during header machining, allowing stable header machining without dimensional changes of the workpiece. This made it possible to continue doing so.

In the present invention, the steel wire is pickled using a dipping method to roughen the surface and coat the surface with an amorphous iron phosphate film.
5 (1/Tl12) can be generated to obtain the film thickness necessary for lubrication.The pickling liquid used in the present invention includes hydrochloric acid, sulfuric acid, phosphoric acid, etc., but sulfuric acid pickling is preferable, and this pickling allows the next step to be carried out. An appropriate iron phosphate film (1 to 58+n'') can be formed on the surface of the steel wire in the phosphate treatment used in .

The phosphorus I salt aqueous solution in the present invention has a pH of 3.0 to 6.5, preferably pl-14.5-6.0, and its composition is based on an alkali phosphate salt or ammonium phosphate. For example, the base is sodium phosphate, potassium phosphate, ammonium phosphate, etc., and known additives such as tungstate ion, chloric acid, hydroxylammonium salt, surfactants, etc. are blended with this. It is possible to use a general phosphate aqueous solution for iron-based skin modeling. However, these iron phosphate coatings are generally used as paint bases for home appliances, agricultural tools, etc., and the corrosion resistance of the coating alone is poor.

The present invention'f:i etc. further includes molybdate ion as a specific substance of 0.01 to 50/β to the base alkali phosphate salt and ammonium phosphate salt in consideration of the use as a base film for aa lubricant. Preferably 0.05-0.5
g/I1. It was discovered that adding it improved corrosion resistance.
It is now possible to stock wire drawing and header processing without rusting.

The phosphate treatment conditions for obtaining the iron phosphate film in the present invention, such as treatment concentration, temperature, and time, are arbitrary.

The lubricants applied to the present invention are commonly used lime soaps, oils, powdered metal soaps (e.g. sodium stearate, barium stearate, etc.), and after phosphate treatment, the lubricants are soaked or sprayed. Alternatively, the lubricant can be applied by placing it in a die box during stretching and passing it through the lubricant.

[Examples] Next, some examples of the present invention will be listed and explained together with comparative examples.

Table 1 shows the compositions and conditions of Examples and Comparative Examples of the present invention.

(Left below) Processing conditions: -Material■For wire drawing 5WRCI-172A 5.5φ■For processing
a) 5WRC+-1183 for flat head screws with large and small holes,
4φ port) SWRC for drywall screw 116 3.15φ ・Processing method (treatment of the above material) ■Processing of the present invention Sulfuric acid pickling: 15%, 60°C, 15 minutes ■Processing of Comparative Example 1 Sulfuric acid pickling: 15%, 60°C, 15 minutes Bonderite 181X: 9011/fl, 8
0℃, 7 minutes Bonda Lube 235: 70g / J2.80”C
15 minutes ■ Treatment with phosphoric acid in Comparative Example 2 ■ Treatment with sulfur f1 in Comparative Example 3 Pickling: 15%, 60°C, 15 minutes ・Evaluation method Wire drawing performance was performed according to test method 1, and processing performance was determined using test method 2. I forged it for a while.

Test method 1: Material: 5WRCH72A 5.5φ wire drawing 1jl
L: 24″ Wire drawing speed of connecting machine: 700 m
7 min Naka wire Conditions Judgment according to Table 2: Wire drawing performance judged by the presence or absence of die marks Test method 2: After processing by the above processing method, skin bath wire drawing was performed and cold forging was performed. Furthermore, we investigated the plating finish.

b) Tsubai = J 1111 cross head large and small screws (SWRC
I-118>Skin pass wire drawing (3,40φ→3.25φ
) - Known screw 19 forged failure IB2 fat - Unichromate []) ] Dry screw A-Le screw SWRCI-11
6) Skin bath wire drawing (3,15φ → 3.02φ) - Known screw cold forging (3-quenching, tempering - IIIJ fat-pickling - l Nikrome 1 ~ In addition, Comparative Example 1 was used for skin pass wire drawing. All except powder metal soap are placed in the dice box.

The test results conducted using Test Methods 1 and 2 are shown in Table 3.

(Leaving space below) * Cold forging) Green bamboo Good 1 O-) 1 Poor Overall evaluation Excellent ◎ Good O Acceptable △ Unsatisfactory The slag clogging resistance of the tool has been completely eliminated, and the plated surface has a good finish.

Compared to Comparative Examples 2 and 3, it has excellent wire drawing performance as well as corrosion resistance and cold forgeability.

(Effects of the Invention) As explained above, by using the fA slip treatment method of the present invention, the following excellent effects can be obtained. Forms an iron-based film [
By doing so, the corrosion resistance of the steel wire surface can be improved.

(2) Zinc phosphate coating J: Thick film that does not use crystalline zinc phosphate coating It can eliminate tool clogging due to lubricant residue during machining.

(3) Since the film is thinner than the conventional zinc phosphate film, chemical consumption G is lower and processing cost is reduced.

(4) Zinc phosphate coatings usually have a treatment solution pH of 2 to 3, whereas the iron phosphate coating of the present invention has a treatment solution pH of 1.
Since it is usually 4.5 to 6.0, etching on the surface of the steel wire is reduced, resulting in a beautiful surface texture of the processed material and a good plating finish surface.

Patent applicant: Kobe Steel, Ltd. Japan Pariki Rising Co., Ltd.

Claims (2)

[Claims] (1) After surface conditioning the steel wire by pickling, I) based on alkali metal phosphate or ammonium phosphate
A method for lubricating a steel wire, which comprises treating the steel wire with an aqueous phosphate solution of H3.0 to 6.5 to form an iron phosphate film on the surface of the steel wire, and then applying a lubricant. (2) The method for lubricating a steel wire as described in item 1 above, wherein the aqueous phosphorous N salt solution contains molybdate ions.