JPS602691A - Surface treatment for parts of fiber machinery - Google Patents

Abstract

PURPOSE:To smooth the high speed traveling of fibers and to improve wear resistance of mechanical parts of fiber machinery by forming the surface of a base material with which the fibers contact to a satin surface in a fiber machinery and laminating and forming a hard Cr plating film and a hard Cr plating film contg. fluoride thereon. CONSTITUTION:A satin surface 2 is formed on the surface of a metallic base material 1 of mechanical parts for synthetic fiber machinery consisting of a carbon steel, etc. The base material is then immersed in the 1st surgent bath consisting essentially of a chromic acid and sulfuric acid to form the 1st hard Cr plating film 3. A hard Cr plating film 4 contg. fluoride is then immediately formed by using the 2nd surgent bath consisting essentially of a chromic acid, sulfuric acid and fluorocompd. The gripping and detaching of the fibers are stably accomplished by such double hard Cr plating layers even if the fibers are run at a high speed. The above-mentioned method is applied to parts such as rollers, pins, guides, etc. used in stages for drawing, twisting, coating of a treating agent, etc.

Description

[Detailed description of the invention] B. Industrial application field The present invention relates to a method for surface treatment of textile machine parts.

Conventional synthetic fiber processing equipment is required to be faster in order to improve productivity.
For textile machine parts such as hot bottles for stretching, the surface is
There is a desire to improve production efficiency by coating parts with a hard layer to prevent them from being abraded by running fibers, increasing wear resistance, and extending the lifespan of parts, thereby reducing the frequency of replacement of parts. In addition, especially in parts where the welding surface is formed on a satin surface with a precisely uneven surface to reduce the contact resistance of the yarn and improve the yarn run, wear due to the running of the fibers is rapid. Therefore, it is necessary to cover the surface of this pear-skinned surface with a layer of high hardness, but in order to form this layer, the pear-skinned surface must have a specified roughness, smooth irregularities, and a smooth surface. The surface must be retained.

For this reason, conventionally, carbon & A base materials coated with hard 4-metal coatings have been mainly used.
The hardness of this product is HV750-HV
It has a hardness of about 900, which cannot satisfy the hardness of HV10oo or more required for the above-mentioned high speed.
Ceramic spraying and electroless nickel may be considered as surface treatment methods with a hardness of HV1000 or higher, but these treatment methods are extremely expensive and uneconomical, and technically speaking, hard chrome plating is not possible. In addition, the Sargent bath is said to be capable of plating with a hardness of HV 1000 or more in literature, but the plating work to achieve this hardness is outside the normal work range. However, in the case of pear-skinned surfaces, protrusions are formed on the periphery of the item, the surface becomes rough, and serious defects such as cracking and discoloration of the plated surface occur, making it impractical. Furthermore, fluoride-containing baths have the characteristic of producing highly hard plating within normal working ranges, but when hard chromium plating is applied directly to a pear-skinned surface using the bath, a hard plating layer is formed; The disadvantage of bathing is that the base material is easily corroded, so the fine satin surface is corroded and the uneven shape of the satin material collapses, and the micrograph in Figure 3 (G) shows that the satin surface, which was properly formed on the base material, is not visible. The material changes as shown in the figure, and the characteristics of a satin surface are no longer obtained. In addition, a v-ra for yarn transfer having a matte surface consisting of a matte rough nickel plating layer formed on the surface of the base material and a hard chromium plating layer covering the nickel plating layer is disclosed in Japanese Patent Publication No. 12184/1984. However, in this known invention, the purpose is to regenerate the surface of a roller, and a hard coating is applied to a base material having a matte surface, which is the object of the present invention, without destroying the matte surface. Methods differ in their purpose and effect. .

The purpose of this invention is to propose a surface treatment method that can form a good matte plating film at low cost, and to improve productivity and durability of parts by increasing the speed.

20 Structure of the Invention In order to achieve the above-mentioned object, the present invention applies a hard chromium plating film to a matte surface formed on the surface of a base material in a Sargent bath, and then coats the surface of the film with a fluoride-containing bath. It is characterized by being coated with hard chrome plating.

E. In Examples Fig. 1 and Fig. 2, first the base material made of carbon steel (
After polishing the surface of 1), polish it with a puff etc., and sandblast the surface to create an uneven surface (
2) Form wo. Next, a first hard chrome plating film (3) is formed on the surface by plating hard chrome plating to a thickness of about 70-20μ in a Sargent bath,
Next, immediately after removing from this Sargent bath, another 7
Approximately 70-50μ hard chrome plating in a fluoride-containing bath
A second hard chrome plating film (4
) and remove it from the bath.

This treatment forms a double hard chrome plating layer.

Since the fibers do not come into direct contact with the surface of this first coating (3), it is not required to have a hardness of HV 1000 or higher, and therefore has a hardness of HV 700 NHV 900 that can be obtained in a Sargent bath within the normal working range. is sufficient, and the film formation becomes easy.

Further, since the second coating (4) directly contacts the fibers, a particularly high altitude is required. When this second coating (4) is hard chromium plated in a fluoride-containing bath, a hardness of HV1000 or more can be obtained in a fluoride-containing bath in a normal working range, so this second coating (4) can be easily formed into a layer having a high hardness of HV1000 or higher. Further, since the first coating (3) is formed by hard chrome plating as described above, the first coating (3) is not corroded even by a fluoride-containing bath, and the first coating (3) The pear surface does not change. Therefore, the acute uneven surface formed on the surface of the base material (1) is formed into a smooth satin surface by the first coating (3), and the second coating (4) forming the fiber contact surface is , is formed on a pear-skinned surface having a smooth surface along the surface of the first coating (3), and the pear-skinned surface has a hardness of HV1000 or more. In addition, as a result of comparing the matte surface of the surface after the first coating treatment and the surface after the second coating treatment under a microscope, the former is as shown in Figure 3 (B), and the latter is as shown in Figure 3 (C). Then, the second
It can be seen that the satin surface of the coating is formed into a satin surface with a good shape, similar to the satin surface of the first coating.

Effects of Toro Invention As described above, according to the present invention, it is possible to form a pear-skinned surface having a smooth surface and a good uneven surface, and the hardness of the pear-skinned surface can be formed to a hardness of HV1000 or more. Not only can productivity be improved by adapting to higher speeds, but also durability can be improved, and the surface treatment is also better than conventional
Since the process can be carried out by a simple plating process within the range commonly used, parts having the above-mentioned effects can be formed at low cost.

[Brief explanation of drawings]

The drawings are for explaining the present invention in detail, and FIG. 1 is a cross-sectional view of a part to which the surface treatment of the present invention is applied, and FIG. 2 is a cross-sectional view of A in FIG.
FIG. 3 shows microscopic photographs in place of drawings, in which (A) shows a satin surface obtained by directly plating the base material surface with a fluoride-containing bath, and (B) shows the resultant surface of the present invention. The pear-shaped surface formed on the first coating surface (q also indicates the pear-shaped surface formed on the second coating surface. Ground (3)...Hard chrome plating coating in O Sargent bath (4)...Hard chrome plating coating I in fluoride-containing bath
Patent Applicant: Kyoei Honing Co., Ltd. Toyo Co., Ltd. Amendment to Procedures for Trading Company Agent (Spontaneous) 1980 5% August 22B 1988 Patent Application No. 109913 2, Title of Invention 3, Person Making Amendment Case Relationship with Patent Applicant 6, Number of Inventions Increased by Amendment Full Text Corrected Specification 1, Name of Invention Method for Surface Treatment of Textile Machine Parts Claims n, A method for treating at least the surface of the base material in contact with the fibers of a,
After forming a satin finish, it is immersed in a first Sargent bath containing chromic acid and sulfuric acid at a concentration of +1" to form a 1-7-quality chromium plating film. A method for surface treatment of a textile machine, comprising immersing it in a second Sargent bath to form a second hard black coating. Detailed explanation of I field of application on beams] is related to the surface treatment method of textile mechanical parts,
More specifically, the present invention relates to a textile machine surface treatment method in which the rollers, bins, and gases used in the drawing, twisting, and processing of synthetic II and other miscellaneous materials run in direct contact with each other. 1- Surface treatment of rollers, bins, guides, etc. conventionally used in the drawing, twisting, and treatment agent application processes of synthetic fibers, and other mechanical parts in which fibers run in direct contact with each other in order to extend their service life. is being carried out. For example, a base material made of carbon steel is immersed in a Sargent bath containing chromic acid and sulfuric acid as main components to coat the surface with chromium plating to improve wear resistance. That VJi W KaHV 75
0 to HV 900 f1 degrees, and when synthetic fibers are run at high speeds, they wear out in a short period of time, breakage occurs frequently, and waste threads are produced frequently, making the quality unstable. In order to improve this abrasion resistance, when trying to increase the hardness by changing the immersion conditions in the Sargeen 1 bath described above, protrusions appeared on some textile machine parts, the surface roughness became rough, and the plating became difficult. It could not be put to practical use because of defects such as cracks and discoloration on the surface. In addition, it has been known that the surfaces of textile machine parts, such as rollers, pins, and guides used in the drawing, twisting, and treatment agent application processes of synthetic fibers, in which fibers run in direct contact with each other, are treated with a satin finish. The surface is elaborately processed with satin finish.
Fiber 1 geometric parts reduce contact resistance of running fibers, 1
1. Although it is possible to improve thread separation from navy blue machine parts for smooth operation, it has poor abrasion resistance and the matte finish on the surface disappears in a short period of time, making it difficult to replace frequently, especially when woven navy blue is run at high speeds. was extremely high, conversely reducing productivity and making it difficult to maintain high quality fibers. [Objective of the present invention] The present invention aims to eliminate the drawbacks of the above-mentioned prior art, to enable smooth high-speed running of fibers, and to significantly improve wear resistance. Textile Ill can obtain textile machine parts that require less frequent replacement and improve production efficiency.
lf! The object of the present invention is to provide a method for surface treatment of machine parts. [Structure of the present invention] The structure of the present invention is such that at least the surface of the base material made of metal in contact with the fibers is made into a matte finish, and then immersed in a first Sargent bath containing chromic acid and sulfuric acid as main components. 1. A textile machine comprising: forming a hard chrome plating film; It is in the surface treatment method of parts. [Specific measures to solve the problem] In Figures 1 and 2, first, a metal base material (1) made of carbon steel is shown.
After polishing the surface, the surface is polished with a puff or the like, and the surface is sandblasted to form a predetermined uneven surface, that is, a satin surface (2). Next, the pear surface (2
), chromic acid 200-3000/l, sulfur IQ,
Hard chromium plating is plated to a thickness of about 15 to 60μ in a first Sargent bath consisting of arbitrarily selected conditions optimal for achieving the desired quality in the range of 3 to 3°00/I. A hard chromium plating film (3) (hereinafter referred to as the first film) is formed in the first sergeant bath, and then immediately after being removed from the first sergeant bath, chromic acid 200 to 300 q/l sulfuric acid 0.3 ~3. Oq/l
, and fluorine compounds within the range of 0.8 to 12.0 g/I, 4- hard chrome plating in a second Sargent bath consisting of arbitrarily selected conditions optimal to have the desired quality It is plated to a thickness of 10 to 30 microns to form a hard chromium plating film (4) of the second Sargent bath (hereinafter referred to as the second coat), and then taken out from the second Sargent bath. Such treatment forms a double hard chrome plating layer. If the thickness of the first coating is less than 15 μm, the base material made of metal may be corroded after the second coat is applied in the second Sargent bath, which is undesirable. If the thickness exceeds 60 μm, the unevenness of the base material decreases. The pear-like surface cannot be maintained. In addition, the second
If the thickness of the coating is less than 10μ, the hardness is 1-IVl 000
If the thickness exceeds 30μ, it becomes difficult to maintain a pear-like surface. Since the fibers do not come into direct contact with the surface of the first coating (3), it is not required to have a hardness of 1V1000 or higher, and therefore it is not required to have a hardness of HV700 to 900 which can be obtained in a Sargent bath within the normal working range. A hardness of 5 - is sufficient, and the film can be easily formed. In addition, the second coating (4) is required to have particularly high hardness because it comes into direct contact with the navy blue traveling at high speed. This second coating (4) can be easily formed into a layer having a high hardness of HVl 000 or higher in a normal working range by simply immersing it in the second Sargent bath containing the fluorine compound. Furthermore, since the first coating (3) is formed of hard chromium plating as described above, the base material of the textile M mechanical part comes into direct contact with the liquid of the second Sargent bath containing a fluorine compound. The second coating (4) is formed with almost no change in the satin surface that was retained when the first coating (3) was formed. That is, the acute uneven surface formed on the surface of the base material (1) is formed into a smooth satin surface by the first coating (3), and the second coating (4) forms a fiber contact surface. is formed on a smooth pear-skinned surface along the surface of the first coating (3), and the pear-skinned surface has a hardness of HVl 000 or more. Figure 3 (B) is a microscopic photograph of the pear-shaped surface formed on the first coating (3) surface, and Figure 3 (C) is a microscopic photograph of the pristine surface formed on the second coating (/I) surface. It was shown to. The third of these
Comparing Figure (B) and Figure 3 (C), the second coating (4)
It can be seen that the satin surface formed on the surface has a good shape, similar to the satin surface formed on the first coating (3) surface. [Examples and Comparative Examples] Example 1 The surface of a carbon steel base material (length 15 cm, thickness 2.5 cmφ) was statically treated with satin finishing, and then chromic acid 2500/
+, sulfuric acid 2.5o/I to form a first hard chromium plating film, and then immediately after removing from said first Sargent bath, chromium 82500/1 Hard chrome plating was formed in a second Sargent bath consisting of 2.50/l sulfuric acid and 3.5 q/l sodium fluoride. The obtained mm mechanical part forms a satin surface, )-I
It had a hardness of Vlloo and could be sufficiently used as a synthetic fiber high-speed (4000 m/min) transport guide. Example 2 Sodium fluoride in Example 1 3. ! Potassium fluoride 3.50/I was used instead of M/l. The obtained fiber M machine part forms a pear-skinned surface, and 1-I
It had a hardness of V1050, making it suitable for use as a synthetic fiber high-speed (4000 m/min) transport guide. Comparative Example 1 The surface of a carbon steel base material was given a satin finish, and then hard chromium plating was applied by immersing it in a Sargent bath consisting of 2500/I chromic acid and 2.5 CJ/l sulfuric acid. A matte surface is formed on the surface, and the running speed of 5ilRt is 250
Although it can be put to practical use as a van mechanical part at speeds of 0 m/min or less, when AI fiber is used as a 1lIff machine part that processes at high speeds of 3,500 m/min or more, it suffers from significant wear and has to be replaced frequently, resulting in long hours. could not withstand use. Comparative Example 2 Sodium fluoride was added as a fluorine compound to the Sargent bath in Comparative Example 1. Oo/I was added to form a satin finish on the surface of the carbon steel base material, and the material was subjected to immersion treatment. Got it! A plating layer with a hardness of around HV100 was formed on the surface of the dark blue mechanical parts, but the carbon steel base material was corroded.
In particular, the fine pear surface becomes corroded, causing the uneven shape of the pear surface to collapse, and the pear surface, which had been properly formed on the base material, changes as shown in the micrograph in Figure 3 (A), and its characteristics as a pear surface deteriorates. I couldn't get it. Comparative Example 3 The surface of a carbon steel base material was subjected to a satin finish, and then ceramic spraying was applied to the surface. It was not possible to form a smooth uneven satin surface on the surface of the obtained part, and it could not be used as an AUTTM machine part. Comparative Example 4 After applying a satin finish to the surface of the carbon steel base material, -〇 - surface treatment was performed using electroless nickel, and then surface treatment was further performed under the conditions described in Comparative Example 1. did. The surface of the obtained part has a satin finish, and although it can be used practically as a textile machine part where the fiber running speed is 2500 m/min or less, it cannot be used as a textile machine part that processes fibers at high speed. If it was, the wear would be significant and it would have to be replaced more frequently, making it unsuitable for long-term use. [Effects of the Invention] According to the present invention, the surface of the base metal made of metal, which is in contact with at least 11 strings, is made into a satin finish, and then immersed in a first Sargent bath containing chromic acid and sulfuric acid as main components. First
The surface is smooth by forming a hard chrome plating film of A pear-shaped surface with a large and good uneven surface can be formed, and the hardness of the pear-shaped surface can be increased to H.
Can be formed to Vl 000 or more as textile machine parts 10
- Even when the fibers are run at high speed using 111Iff gripping and 11M1 theory, it is possible to obtain stable, high-quality fiber products, which have excellent abrasion resistance and require less frequent replacement of parts. It is effectively used for high-speed running processing of powerful synthetic m miscellaneous vehicles. 4. Brief explanation of the drawings The drawings provide a detailed explanation of the present invention. Fig. 1 is a cross-sectional view of a part to which the surface treatment of the present invention is applied, and Fig. 2 is a cross-sectional view of A in Fig. 1.
FIG. 3 shows microscopic photographs in place of drawings; (A) is a matte surface obtained by directly plating the base material surface with a fluoride-containing bath; (B) is the present invention. (C) shows the satin-finished noodles formed on the first coating surface, and (C) also shows the satin-finished noodles formed on the second coating surface. (1)... Base material (2)... Satin surface of base material (3)... Hard chrome plating coating of Sargent bath (4)... Hard chrome plating coating for fluoride-containing baths 11-

Claims (1)

[Claims] A surface of a textile machine part characterized in that a hard chrome plating film is applied to a satin surface formed on the surface of a base material in a Sargent bath, and then a hard chrome plating film is applied to the surface of the film in a fluoride-containing bath. Processing method.