JP2009132811A - Dry wire drawing lubricant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance dry wire drawing lubricant which can be used under severe wire drawing conditions including a high speed and a high area reduction, can cope with reduction of wire diameters extensively covering fine to thick diameters and with a wire speed extensively covering low to high speeds, and is excellent in lubricity, followability, spreadability, adhesivity, heat resistance, processability, workability, safety, durability, etc. <P>SOLUTION: The dry wire drawing lubricant comprises 30-90 wt.% metal soap of a saturated fatty acid and 1-30 wt.%, based on the metal soap, at least either an unsaturated fatty acid convertible into a polymer under heat and/or under pressure or the polymer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lubricant used when a metal workpiece is drawn (drawn) using a die.

  Dry wire drawing lubricants are widely used in wire drawing work where a metal workpiece such as steel is drawn using a die and plastically deformed into a wire or bar with the desired wire diameter. . This lubricant is used to prevent the raw material to be processed and the die from coming into direct contact and seizure, to be slippery and to maintain a stable processing state.

  General-purpose dry wire drawing lubricants contain a saturated fatty acid metal soap as a main active ingredient, and further contain inorganic substances and additives. As the metal soap, sodium-based soap or calcium-based soap is appropriately selected and used depending on the processing application.

  A dry-drawing lubricant containing an alkali metal soap such as sodium is easy to form a lubricating film having slipperiness. Moreover, the lubricating coating is water soluble. Therefore, this lubricant has a feature that it is easy to remove before plating or pre-heat treatment. On the other hand, it will be liquefied when exposed to high temperatures, and the followability required for the lubricant will be lost, and the spreadability to the wire will be reduced, so that it will be drawn under severe conditions such as high-speed drawing. It is unsuitable for processing. In addition, even if it can be spread on the wire or wire, the lubrication film formed by it can be easily peeled off, resulting in deterioration of the work environment due to dust generated from the peeled film, health damage to workers, environmental pollution, etc. There was a problem of causing.

  On the other hand, a dry wire drawing lubricant containing an alkaline earth soap such as calcium has a high softening point and has a feature of reducing generation of rejection. On the other hand, because the lubricant is likely to be hardened by heating, the spreadability of the lubricant is lost as the number of dies passing through increases, and the lubricant coating is easily cut off. There was a problem.

  As another dry wire drawing lubricant, for example, in Patent Document 1, alkali metal sulfate and alkali metal borate are essential components, alkali metal salt of saturated fatty acid, alkaline earth metal salt of saturated fatty acid, solid lubrication A lubricant composition including a lubricant and a water-soluble thermoplastic resin and having excellent lubricity and workability is disclosed.

  In order to improve productivity, it can withstand the wire drawing under severe conditions under high temperature, high pressure, and high speed while maintaining the features of the conventional dry drawing lubricant containing metal soap of saturated fatty acid. There was a need for high-performance dry-drawing lubricants.

Japanese Patent Laid-Open No. 10-36876

  The present invention has been made to solve the above-mentioned problems, and can be used under severe wire drawing conditions under high temperature, high pressure, and high speed. Can be used for a wide range of wire speeds from high to high speeds, and for high performance dry wire drawing with excellent lubricity, followability, spreadability, adhesion, heat resistance, workability, workability, safety, durability, etc. The object is to provide a lubricant.

  The dry wire drawing lubricant according to claim 1, which is made to achieve the above object, comprises 30 to 90% by weight of a metal soap of saturated fatty acid, under heating and / or under pressure. The unsaturated fatty acid which becomes a multimer and 1 to 30% by weight of at least one metal soap of the multimer are contained.

  The dry drawing lubricant according to claim 2 is the lubricant according to claim 1, wherein the saturated fatty acid is butyric acid, caproic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, It is characterized by being palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, and / or melicic acid.

  The dry drawing lubricant according to claim 3 is the lubricant according to claim 1, wherein the unsaturated fatty acid is optosilic acid, caproleic acid, undecylic acid, Lindelic acid, Shizic acid, fizeteric acid, myristoleic acid, palmitolein. At least one monoene selected from acid, petroceric acid, oleic acid, elaidic acid, aslepic acid, vaccenic acid, gadoleic acid, gondoleic acid, cetreic acid, erucic acid, brassic acid, seracoleic acid, ximenoic acid, and rumecetic acid Saturated fatty acids: sorbic acid, linoleic acid, hiragoic acid, α-eleostearic acid, β-eleostearic acid, punicic acid, linolenic acid, γ-linolenic acid, moloctic acid, stearidonic acid, arachidonic acid, iwacic acid, herring At least one polyene unsaturated fatty acid selected from acids; Alor acid, Kurepenin acid, characterized in that at least one of Mono in unsaturated fatty acids, and / or poly-ynes unsaturated fatty acids selected from ximeninic acid.

  The dry drawing lubricant according to claim 4 is the lubricant according to claim 1, wherein the metal soap is a lithium salt, sodium salt, potassium salt, calcium salt, magnesium salt, aluminum salt, zinc salt, barium salt. And / or a composite metal salt thereof.

  The dry-drawing lubricant according to claim 5 is the lubricant according to claim 1, and boric acid, borate, phosphate, sulfate, carbonate, nitrate, slaked lime, titanium oxide, talc, mica, Graphite, molybdenum disulfide, layered double hydroxide, and / or sulfur are contained.

  The dry-drawing lubricant of the present invention is used particularly when drawing wire under conditions of high speed and high area reduction. This lubricant contains unsaturated fatty acid metal soap that easily undergoes an intermolecular polymerization reaction depending on the conditions. Therefore, an intermolecular polymerization reaction takes place on the heating surface and pressure surface during wire drawing, resulting in an increase in the amount of the lubricant surface. In addition, a lubricious coating film having a high flexibility is formed to exhibit lubricity, followability, spreadability, and adhesion, thereby facilitating wire drawing.

  This dry wire drawing lubricant can form a lubricating film having excellent slipperiness that is less likely to be peeled off on the surface of the wire than the dry wire drawing lubricant using a saturated fatty acid metal soap as in the prior art. This lubricating coating is excellent in heat resistance and high temperature spreadability.

  This dry wire drawing lubricant is suitable not only for wire drawing conditions using conventional dry wire drawing lubricants, but also for wire drawing conditions that are much more severe than that of high speed and high surface area reduction. It is particularly useful when forming a wire drawing with a wide wire diameter from a thick line to a thin line.

  Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples.

  One aspect of a preferred embodiment of the dry wire drawing lubricant includes a saturated fatty acid metal soap and an unsaturated fatty acid metal soap.

  Saturated fatty acids are those having 4 to 30 carbon atoms, and include linear, branched, or cyclic saturated fatty acids. More specifically, butyric acid, caproic acid, caprylic acid, pelargonic acid, capric acid, Examples include undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, and melicic acid. These may be used alone or in combination. Saturated fatty acids may be commercially available products, which are hydrolyzed by hydrogenation of natural fats and oils such as animal fats and vegetable fats and oils containing various types of saturated fatty acid esters and unsaturated fatty acid esters. There may be.

  It is preferable that 30 to 90% by weight of a saturated fatty acid metal soap is contained in the dry drawing lubricant.

  Unsaturated fatty acids are those having 6 to 30 carbon atoms, linear, branched or cyclic, mono- or poly-ene unsaturated fatty acids having 1 to 6 unsaturated double bond groups, and triple Examples thereof include mono- or poly-in unsaturated fatty acids having 1 to 2 bonds.

  As monoene unsaturated fatty acid, for example, monoene unsaturated fatty acid having 10 to 30 carbon atoms and having a double bond group at the end or in the end of a long chain, more specifically, optusilic acid, caproleic acid, undecylic acid, , Shizic acid, Fizeteric acid, Myristoleic acid, Palmitoleic acid, Petroselinic acid, Oleic acid, Elaidic acid, Alepinic acid, Baxenoic acid, Gadrenoic acid, Gondelic acid, Cetoleic acid, Erucic acid, Brassic acid, Seracoleic acid, Ximenic acid And lumecitric acid.

  As polyene unsaturated fatty acid, for example, polyene unsaturated fatty acid having 6 to 24 carbon atoms and having a double bond group that may be conjugated or not conjugated in the chain or at the end, more specifically, sorbine Diene unsaturated fatty acids such as acids, linoleic acid; triene unsaturated fatty acids such as hiragoic acid, α-eleostearic acid, β-eleostearic acid, punicic acid, linolenic acid, γ-linolenic acid; moloctic acid, And tetraene unsaturated fatty acids such as stearidonic acid and arachidonic acid; pentaene unsaturated fatty acids such as sardine acid; and hexaene unsaturated fatty acids such as nisic acid. Further, examples of the polyene unsaturated fatty acid include monoin unsaturated fatty acids and polyin unsaturated fatty acids such as taliric acid, stearolic acid, crepenic acid, and xymenic acid.

  The unsaturated fatty acid may be used alone or in combination of monoene unsaturated fatty acid and polyene unsaturated fatty acid. It is more preferable that it has a polyene unsaturated fatty acid.

  Unsaturated fatty acids may be commercially available, natural fats and oils such as animal fats and vegetable fats and fats containing various types of saturated fatty acid esters, unsaturated fatty acid esters and hydroxy fatty acid esters, or as required. It may be hydrolyzed after dehydration.

  It is preferable that 1 to 30% by weight of an unsaturated fatty acid metal soap is contained in the dry drawing lubricant in the dry drawing lubricant. If it is less than the range, only wire drawing characteristics comparable to conventional lubricants can be obtained, while if it exceeds the range, the wire drawing characteristic reaches the upper limit, causing not only a price increase but also a viscosity that is too high. It becomes sticky. The unsaturated fatty acid is preferably composed mainly of a polyene unsaturated fatty acid such as linoleic acid, which tends to increase in amount as compared with a monoene unsaturated fatty acid such as oleic acid. In the dry-drawing lubricant, an unsaturated fatty acid, for example, an unsaturated fatty acid metal soap mainly composed of linoleic acid is contained in an amount of preferably 2 to 30% by weight, more preferably 3 to 10% by weight.

  The unsaturated fatty acid may contain a multimer such as a dimerized acid.

  The metal soap of the saturated or unsaturated fatty acid in the dry drawing lubricant is not particularly limited, but the lithium salt, sodium salt, potassium salt, calcium salt, magnesium salt, aluminum salt, zinc salt, barium It may be a salt, a single metal salt, or a composite metal salt thereof.

  The dry drawing lubricant may contain an inorganic substance or a solid lubricant. As minerals and solid lubricants, boric acid; borate, phosphate, sulfate, carbonate, nitrate, such as lithium, sodium, potassium, calcium, magnesium, aluminum, zinc, Barium salt; slaked lime; metal oxide such as titanium oxide; talc; mica; graphite; molybdenum disulfide; layered double hydroxide intercalated with water molecules and organic acid molecules;

  The dry wire drawing lubricant may contain additives such as preservatives and anticorrosives as necessary.

  The dry wire drawing lubricant may be in the form of a solid, powder, or granule.

  Dry wire drawing lubricants include, for example, saturated fatty acids, unsaturated fatty acids, hydroxides or slaked lime such as caustic soda and caustic potassium, and, if necessary, a medium such as water, other inorganic substances and solids. The lubricant and additives are mixed and heated, dried, and then pulverized.

  More specifically, 45 to 65 parts by weight of saturated and unsaturated fatty acids and 15 to 20 parts by weight of tap water are mixed and heated to melt, and 5 to 15 parts by weight of boric acid and about 50% by weight aqueous caustic soda solution 10 -30 parts by weight and 5 to 15 parts by weight of about 50% by weight aqueous caustic potassium solution are added, heated and stirred, then dried and ground to obtain a dry wire drawing lubricant. Further, 30 to 70 parts by weight of saturated fatty acid and 5 to 15 parts by weight of unsaturated fatty acid are mixed and heated and melted, and 25 to 65 parts by weight of slaked lime is added, heated and stirred, and then pulverized. A lubricant is obtained.

  Examples of producing a dry wire drawing lubricant to which the present invention is applied are shown below in Examples.

Example 1
In a reaction vessel equipped with a stirrer, 45 parts by weight of industrial stearic acid, 5 parts by weight of the unsaturated fatty acid which tends to increase in quantity, and 15 parts by weight of tap water are added, and heated and melted with stirring. 9 parts by weight were added, and further 17 parts by weight of 48% aqueous sodium hydroxide solution and 9 parts by weight of 48% aqueous caustic potassium solution were added. Heating and stirring were continued until the water content became 1.0% or less. The obtained dried crude lubricant was pulverized with a 500 mesh sieve so that the passing rate was about 60%, thereby obtaining a sodium-based dry drawing lubricant.

(Comparative Example 1)
A lubricant was obtained in the same manner as in Example 1 except that the unsaturated fatty acid of Example 1 was not used.

(Example 2)
In a reaction vessel equipped with a stirrer, 50 parts by weight of industrial hydrogenated beef tallow and 5 parts by weight of the same type of unsaturated fatty acid used in Example 1 were added, and the mixture was heated and melted with stirring. Part by weight was added. Heating and stirring were continued until the mixture became viscous. When the mixture became hard, heating and stirring were stopped, taken out, cooled, and pulverized with a 500 mesh sieve so that the passing rate was about 60% to obtain a calcium-based dry drawing lubricant.

(Comparative Example 2)
A lubricant was obtained in the same manner as in Example 2 except that the unsaturated fatty acid in Example 2 was not used.

  Using the dry drawing lubricants of Examples 1 and 2 and Comparative Examples 1 and 2, the wire drawing was performed by a wire drawing machine, and the performance was evaluated.

(Drawing conditions)
The processing conditions for wire drawing using a die are as follows.
Material of workpiece material: 72A material Line speed: 40m / min Wire diameter reduction: 2.8mmφ → 2.5mmφ → 2.25mmφ → 2.00mmφ 3 steps (Repeat 1 pass and extend 3 passes) Lined.)
Pretreatment: Borax (borax)

  The drawing method and the performance evaluation method are as follows.

(Drawing method and average drawing force measurement test)
The processed wire was pickled and removed from the surface of the processed wire using a 12 wt% aqueous hydrochloric acid solution, then washed with water several times, and immersed in a 1 wt% borax aqueous solution heated to about 80 ° C. The processed wire was pulled up from the borax aqueous solution and dried to form a borax film on the processed wire, and pre-processed. Subsequently, an arbitrary amount of the evaluation lubricant was introduced into the die box, and the wire drawing evaluation of the pretreated wire was performed according to the above conditions. A load cell was attached to the die, and the average drawing force was measured when the wire drawing was performed for 20 to 30 seconds. The results are shown in Table 1.

  As is clear from Table 1, in any wire diameter, when the dry drawing lubricant of Example 1 is used, a numerical value with a lower average pulling force than when the lubricant of Comparative Example 1 is used. Indicated. On the other hand, when the dry drawing lubricants of Example 2 and Comparative Example 2 were used, no difference in average drawing force was observed in the first pass drawing (diameter 2.8 → 2.5 mmφ). It was. However, when the dry-drawing lubricant of Example 1 was used in the second and subsequent passes (wire diameters of 2.5 → 2.25 mmφ and 2.25 mmφ → 2.0 mmφ), Comparative Example 1 The average pulling force was lower than that when using the above lubricant.

(Visual observation test of wire surface after wire drawing)
The drawn wire was washed with a wire drawing detergent (manufactured by Kyoeisha Chemical Co., Ltd .; trade name), and the surface was visually observed. The results are shown in Table 2.

  As is clear from Table 2, in any wire diameter, when the dry drawing lubricant of Example 1 was used, the lubricant was spread in a uniform film shape on the surface of the wire after drawing. On the other hand, when the lubricant of Comparative Example 1 was used, the lubricant adhered to the surface of the wire after wire drawing in the form of powder or spots. On the other hand, when the dry drawing lubricant of Example 2 was used, the lubricant was spread in a uniform film shape on the surface of the wire after drawing at any wire diameter, whereas the comparative example When the lubricant (2) is used, the wire adheres to the surface of the wire after wire drawing in the form of powder or spots, or the lubricant adheres to only a part of the powder and does not adhere to the other part. Have been exposed. It is inferred that such a difference appears as a difference in the average pulling force in Table 1.

(Microscopic observation test of the surface of the wire after drawing)
The drawn wire was washed with a cleaning agent, and the surface thereof was magnified 400 times with a laser microscope and observed. The results are shown in Table 3.

  As is apparent from Table 3, when the dry drawing lubricants of Examples 1 and 2 were used, the flat part generated by direct contact between the die and the wire, ie, the microscope was observed at any wire diameter. It was confirmed that the wire drawing state was good because there were very few portions that were sometimes observed as white stripes or spots. On the other hand, when the lubricants of Comparative Examples 1 and 2 were used, a flat portion, that is, a white streak or a spot-like portion by a microscope, was generated much more than in the case of Example 1 at any wire diameter. It was confirmed that the wire drawing state was poor. Furthermore, in the case of the comparative example 2, it was recognized that the flat part is increasing as it diameter-reduces thinly.

(Measurement of dry wire drawing lubricant adhesion on the surface of the wire after drawing)
Measure the weight of the drawn wire, wash it with a cleaning agent, measure the weight of the wire again, and calculate the amount of adhesion from the weight difference before and after cleaning and the diameter and length of the wire. . The results are shown in Table 4.

  As is apparent from Table 4, at any wire diameter, when the dry drawing lubricant of Example 1 was used, a larger amount of lubricant was drawn than when the lubricant of Comparative Example 1 was used. It was attached to. On the other hand, the adhesion amount of the lubricant for the wire drawing with a wire diameter of 2.5 mmφ was not different between Example 2 and Comparative Example 2, but the wire drawing with a wire diameter of 2.25 and 2.5 mmφ thinner than that was used. The amount of lubricant adhered was larger when the lubricant of Example 2 was used than when the lubricant of the comparative example was used. It is assumed that such a difference appears as an enlargement of a flat portion observed as a streak or a spot on the surface in the microscopic observation as shown in Table 3.

  The high-performance dry-drawing lubricant of the present invention is used for wire-drawing processing in which a raw material to be machined, such as a metal such as steel, a rod, or a rod, is drawn and reduced in diameter using a die. Used.

Claims (5)

  30 to 90% by weight of a saturated fatty acid metal soap, and 1 to 30% by weight of an unsaturated fatty acid that becomes a multimer under heating and / or pressure and at least one metal soap of the multimer. A dry-drawing lubricant characterized by   The saturated fatty acid is butyric acid, caproic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, and The dry-drawing lubricant according to claim 1, wherein the lubricant is a melicic acid.   The unsaturated fatty acid is optosylic acid, caproleic acid, undecylic acid, Lindellic acid, Shizic acid, fizeteric acid, myristoleic acid, palmitoleic acid, petroceric acid, oleic acid, elaidic acid, aslepic acid, vaccenic acid, gadoleic acid, gononic acid At least one monoene unsaturated fatty acid selected from drain acid, celetic acid, erucic acid, brassic acid, ceracoleic acid, ximenoic acid, and rumecic acid; sorbic acid, linoleic acid, hiragoic acid, α-eleostearic acid, β- At least one polyene unsaturated fatty acid selected from eleostearic acid, punicic acid, linolenic acid, γ-linolenic acid, moloctic acid, stearidonic acid, arachidonic acid, sardic acid, nisinic acid; Selected from acid and xymenic acid Kutomo one dry drawing lubricant according to claim 1, characterized in that a Mono in unsaturated fatty acids, and / or poly-ynes unsaturated fatty acids.   The metal soap is a lithium salt, sodium salt, potassium salt, calcium salt, magnesium salt, aluminum salt, zinc salt, barium salt, and / or a composite metal salt thereof. Dry wire drawing lubricant.   Contains boric acid, borate, phosphate, sulfate, carbonate, nitrate, slaked lime, titanium oxide, talc, mica, graphite, molybdenum disulfide, layered double hydroxide, and / or sulfur The dry-drawing lubricant according to claim 1.