KR930003608B1 - Surface treating method of textile machinery parts - Google Patents

Abstract

This method treats electrochemically the surface of textile and spinning machine components. Most parts of textile machinery use surface- untreated iron, cast iron, steel, aluminum alloy, and resin, so corrosion or abraison occurs. In the treatment an electrolytic solution is made by dissolving 0.01-0.1 wt.% ammonium thiomolybdate ((NH4)2MoS4) in purified water. Al-based textile machinery parts such as porous alumite formed disks, bobbins, spindles, and drums, are used as anode. Molybdenum sulfide is packed into the pores of alumite by electolysis at a current density of 0.01-1 A/dm2, at a voltage of 10-200 V in the electrolytic solution at 0-30 deg.C, for 1-15 min.

Description

Surface treatment method of textile machinery parts

1 is a schematic layout of an electrolytic cell.

2 is a diagram showing a state in which molybdenum sulfide is filled in the alumite coating.

The present invention relates to a surface treatment method for fibers and spinning machine parts used in processing fibers and the like.

The parts used in textile and spinning machines are made of iron, cast iron, steel, aluminum alloy, resin (such as bakelite, hard nylon, or depron) without any surface treatment. The problem of corrosion resistance arises. In order to solve this problem, there are chromium plated and nickel plated or alumina (Al ₂ O ₃ ) and chromium oxide or ceramic coated on the surface of the metal, but these have a problem of cost increase, In particular, ceramics have a problem in that they are vulnerable because they are fragile.

In addition, in order to improve the corrosion resistance and abrasion resistance, which is a problem of the prior art, the parts of the fiber and spinning machine can be subjected to the alumite (porous anodization) treatment of aluminum or aluminum alloy, In order to improve the quality, improve the manufacturing efficiency and speed up the production line, conventional alumite and hard alumite treatments are insufficient. This is because yarns which are combined with the raw materials of these products and the raw materials of yarns (including both natural fibers and chemically synthesized fibers) and the like due to deterioration of the surface state due to the change of alumite over time. It is difficult to manufacture high-quality products because the quality of the final finished product (ie, a combination of yarns or woven fabrics composed of them) is degraded by increasing the production rate of defective products due to the occurrence of fine or frayed hairs.

These problems are serious due to the high performance and high speed of the machine, so that most of the parts rotate, slide and vibrate at high speed. Especially, the parts that use metals with a high specific gravity of iron and brass are insufficient in energy saving effect. Will have In addition, even when the aluminum or aluminum alloy is subjected to an alumite or hard anodize treatment, the ceramic coatings are susceptible to impact and hardening, and when the aluminite layer is destroyed, aluminum is exposed to shorten the life of mechanical parts.

In addition, a lubricant is formed on the alumite by spray coating and baking coating, so that the component is rotated or slid without great resistance when the component is first operated (that is, when it enters a moving state from a stationary state). It is only in the early stages, and after some time of operation, such a coating layer (spray coating and baking coating only) is worn out and consumed, and the wear coefficient becomes extremely large, adversely affecting the quality of the yarn and textile products.

Moreover, the speed of modern machines is high, the size of the thread is thin and the strength is high, so the value of the pressure x speed when the thread co-bonded with these threads passes through the mechanical parts (mostly rotating parts) (so-called PV value). The higher the PV value is, the more severe the load is placed on the part), and the material and surface treatment technology of the conventional part are insufficient to cope with the situation.

An object of the present invention is to provide a surface treatment to the porous anodic oxide film to increase the wear by increasing the PV value due to the high speed, thinning and fiber fibers that can prevent the disconnection of the yarn and the product value It is to provide a method for surface treatment of parts.

In order to achieve the above object, the present invention provides a disk with a porous alumite layer formed on its surface in an aqueous solution (electrolyte solution) obtained by dissolving ammonium thiomolybdate (NH ₄ ) ₂ MoS ₄ in a pure water at a concentration of 0.01wt% to 0.1wt%. 1, at a temperature of 0 ° C. to 30 ° C. at a constant current density of 0.01 A / dm 2 to 1 A / dm 2 and a constant voltage of 10 V to 200 V, using Al-based fiber machinery parts such as bobbins, spins, and drums as anodes. Provided is a method for surface treatment of textile machinery parts in which molybdenum sulfide is filled in pores of the alumite layer by energizing for 15 to 15 minutes.

The parts used in textile machinery are made of aluminum or aluminum alloy, which can be cast, die cast, powder sintered, dry or wet aluminum plating. Do. In addition, it is also possible to use a thin film of aluminum formed by aluminum plating on a material such as iron, stainless, brass or the like that cannot be aluminized. The thickness of the required aluminum used in the present invention is 5 μm or more in consideration of the actual thickness of aluminum and the margin of aluminum during anodizing.

Then, the surface of the aluminum or aluminum alloy (i.e., spinning, the necessary surface acting as a textile machine, for example, the slope of the guide, the surface of the winding roll, the winding tension adjustment) At least 5μm thick porous anodized film is used on pulley, roll surface, etc.). This is because if the thickness of the porous anodized film, that is, the porous alumite layer is not more than 5 μm, no clear porous spheres are formed, so that the molybdenum sulfide cannot be impregnated into the porous alumite layer. In addition, in view of wear resistance, the thickness of the alumite layer should be 5 μm or more.

1 is a schematic diagram of an apparatus used for the surface treatment method of a component according to the present invention. As shown in FIG. 1, ammonium thiomolybdate ((NH ₄ ) ₂ MoS ₄ ) was dissolved in pure water at a concentration of 0.01 wt% to 0.1 wt% to form an electrolyte solution 1, and the thickness of the alumite layer was 5 μm or more. Connect the workpiece 2 to the anode side of the power supply in the electrolytic cell, and then, at a constant current density of 001 A / dm 2 to 1 A / dm 2 and a constant voltage of 10 V to 200 V, at 0 ° C. to 30 ° C. in the electrolytic cell 3. Turn on for 1 to 15 minutes. Molybdenum sulfide is then transferred to the electrolytic solution in the pores of the alumite layer (there are hundreds (about 300 ~ 500) per 1 m 2 of pores having a diameter of about 200 mm in the alumite layer evenly on all surfaces). The filling is performed from the bottom of the pores.

The reason for limitation of these processing conditions is explained below.

These treatment conditions are determined by the composition or use of the material of the aluminum alloy, which is the raw material of the machine part, the thickness of the alumite, and the like. When the electrolyte concentration is higher than 0.1%, the current density is higher than 1A / dm 2, or when the electrolysis time is longer than 15 minutes, black powder adheres to the surface and the color unevenness is caused by excessive electrodeposition. On the contrary, when the electrolyte concentration is lower than 0.01%, the current intensity is less than 0.01A / dm 2, or the electrolysis time is shorter than 1 minute, the amount of molybdenum sulfide impregnation decreases. As for the temperature of electrolyte solution, 0 degreeC-30 degreeC is preferable. If the temperature of the electrolyte solution is less than 0 ° C, the electrical conductivity of the electrolyte solution (concentration 0.01 to 0.1wt%) of ammonium thiomolybdate ((NH ₄ ) ₂ MoS ₄ ) is lowered and the current is difficult to flow. It cannot be deposited in the ball. On the other hand, when the temperature of the electrolyte exceeds 30 ℃, the liquid temperature of the electrolyte is so high that the chemical decomposition reaction of the electrolyte easily occurs even without energizing, so the life of the active component of the electrolyte is shortened. If the constant voltage is less than 10V, MoS ₄ ^-2 (molybdenum sulfide ion) in the electrolyte cannot reach the inside of the micropores of the alumite layer, and therefore H ⁺ in the active layer of the alumite (barrier layer: a very thin film without micropores). Since ions are not generated, molybdenum sulfide cannot be precipitated. On the contrary, when the constant voltage exceeds 200 V, MoS ₄ ^-2 ions invade toward the hard alumite layer, and at the same time, a large amount of H ⁺ ions are generated in the active layer, thereby preventing stable molybdenum sulfide formation reaction. H ⁺ ion generation also causes a case where the defective part of the alumite (a defect part which is an essential part of the alumite treatment) is peeled off.

2 shows a state in which the pores of the alumite are filled with molybdenum sulfide, where (1) is an aluminum or aluminum alloy material, (2) is an aluminite film and pores, and (3) is a molybdenum filled in the pores of an alumite. Sulfides. At this time, as a material of a cathode, carbon-carbon, stainless steel, aluminum, etc. are suitable. Molybdenum sulfide is filled from the bottom of the pores to the surface, so that the yarn fused with the thread exhibits sufficient lubrication effect when passing through the surface of the part, so that the flow of the yarn is soft, eliminating warpage and the like of the conventional thread. This prevents disconnection and loosening of fibers and wear. Furthermore, the filling of molybdenum sulfide is advantageous because the corrosion resistance against moisture of the yarn and the plant atmosphere pulverized with the yarn is improved further than that of the conventional alumite alone.

Since the present invention fills the pores of porous alumite with molybdenum sulfide, the quality control of industrial parts is easier and the cost is lower than that of conventional ceramic processing or plating processing.

The performance test of both of them was carried out with the yarns co-ordinated with the yarns using the method according to the present invention and the parts manufactured by the existing method.

(1) The surface roughness of a circular surface of 100 mm in diameter and 10 mm in width of ADC-12's thread-passing reel made of ADC-12 (aluminum alloy die-cast material) is 0.1 μm (1RZ). (2) a 15 μm hard alumite layer was formed on the polished surface, and (3) the removal of (NH ₄ ) ₄ MoS ₄ , which is the core of the present invention, in the micropores of the hard alumite. (Iii) Molybdenum sulfide was sufficiently charged to the surface of the alumite layer by constant current electrolysis in an ion aqueous solution.

The results of this filling were examined by blackening of the color tone and analyzing by X-ray microanalyzer (E.P.M.A). And the surface roughness of (2) and (3) was processed to 0.3 micrometer (RZ).

(4) Three winding windings of cast iron, bakelite and cast iron of 200 μm chromium plating having the same shape for comparison with the present invention obtained in the above (1), (2) and (3). Ready to reel.

(5) The change of abrasion resistance by the passage of the yarn which coaxed with the yarn in these six reels was seen.

(6) These six reels were placed in a salt spray tester and subjected to 72 hours of salt spray to compare the corrosion resistance of the pass surfaces.

(7) The yarn used was made into two kinds of yarns, in which 20 cottonless yarns having a diameter of 30 µm were fed and plied with grass, and one strand of 30 µm cottonless threads.

At this time, the line speed was 500 m / min, and the tension of the yarn which was braided with the yarn was 5 g of the yarn and 30 g of the yarn that was braided.

All the tests used were dry and did not use water or oil. For each of these six reel surfaces, a single wire and a ream of the surface of the reel were run when the yarns co-ordinated with the above yarns were run continuously for two days (24 hours × 2 days × 500 m × 60 minutes = total running length of 1.44 million m). The observed results of the traces are shown in Table 1.

TABLE 1

When driving one 30μm

As can be seen from Table 1, the experiments show that the case of molybdenum sulfide filling has an excellent effect when compared with the other examples. Almost identical.

After filling the alumite with molybdenum sulfide in this way, organic (e.g., dephron spray coating and fluororesin) lubricants and inorganics (e.g., baking and coating of sulfides of molybdenum sulfide and tungsten sulfide or other metals) It is possible to greatly improve the rotation and slidability without the big resistance when the part is first operated. The surface can be smoothly processed by grinding, buff cutting, plastic deformation, etc. The alumite may be dyed with a dye for the management and identification of

As the organic lubricant, aliphatic groups such as stearic acid, palmitic acid and oleic acid, petroleum aromatic groups such as paraffin, perfluoroalkyl compounds, ethylene tetrafluoride, tridiethylene, mineral oil, carbon fluoride, graphite and the like can be used. Boron nitride (BN), tungsten disulfide, molybdenum disulfide, etc. can be used. As a method of coating them, a method of rubbing them alone on the surface of an alumite and a method of dispersing them by rubbing them in mineral oil and rubbing them, these are mixed with resins such as epoxy and acrylic, and immersed, brushed, sprayed, etc. It is applied to baking, baking and heat treatment. However, the present invention is not limited to these methods and may be fixed or fixed to the surface of the lubricating alumite layer by ceramic sintering by combining them with one or more organic lubricants and inorganic lubricants.

As described above, the present invention can reduce the coefficient of friction, improve the corrosion resistance, and reduce the weight in the parts of the textile machine and the spinning machine, so that parts of the textile machine and the spinning machine can be manufactured at high speed and quality. The added value of the goods produced by them can be improved, so that the industrial value can be very high.

Claims (3)

Al such as disks, bobbins, spindles and drums in which a porous alumite layer is formed on the surface of an electrolyte obtained by dissolving ammonium thiomolybdate ((NH ₄ ) ₂ MoS ₄ ) in a pure water at a concentration of 0.01wt% to 0.1wt%. The alumite layer was supplied by electrolytically conducting electricity for 1 to 15 minutes at a temperature of the electrolyte of 0 ° C. to 30 ° C. at a constant current density of 0.01 A / dm 2 to 1 A / dm 2 and a constant voltage of 10 V to 200 V using the textile machine part as an anode. A surface treatment method of a textile machinery part, characterized by filling molybdenum sulfide in the pores of the pores. The surface treatment method of a textile machine part according to claim 1, wherein the thickness of the alumite layer is 5 µm or more. The method of claim 1, further comprising coating an organic lubricant or an inorganic lubricant on the surface of the molybdenum sulfide.

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