JP2002194523A - Drive component, its manufacturing method, and opening/ closing device for electric power with drive component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a drive component which contributes to reducing consumption of a plating solution containing hexavalent chromium, and enhance security for human bodies and a harmonizing property to environment, by employing a coating which has a high level of abrasion resistance, sliding property, sealing property, corrosion resistance, and weathering resistance, without employing hard chromium plating. SOLUTION: The drive component has a composite coating film 11 on the base material 10, which consists of a carbide layer 12 as a base and an impregnated resin layer 13 therein. The carbide layer 12 comprises powder which is made from a WC-Co-Cr based or CrC-NiCr based carbide material and has a particle size of 60 μm or less, and forms a layered structure having micropores 12a. The resin layer 13 consists of a siloxane combined or fluorine-based resin material, and is impregnated into the micropores 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive component, a method for manufacturing the same, and a power switchgear provided with the drive component, and more particularly to a technique for forming a film on a surface of the drive component.

[0002]

2. Description of the Related Art In general, a power switching device such as a power circuit breaker incorporates a drive component for driving an electrode.
Since this drive component operates only in an emergency such as an accident, the operation frequency is rare. In addition, when the power switch is in an energized state, inspection and maintenance of the drive components cannot be performed. Therefore, once dirt or dust adheres to the surface of the components, it is difficult to remove them. Therefore, a driving component of a power switching device is required to have a high operation reliability that is incomparable to a driving component incorporated in a device other than the power switching device.

Here, the drive components incorporated in the power switchgear will be specifically described with reference to FIG. FIG.
Indicates an outline of a hydraulic operation mechanism. The hydraulic operating mechanism includes a pump unit 3, an accumulator 4, and a hydraulic cylinder unit 5, and a piston rod 6 is mounted on the hydraulic cylinder unit 5. The piston rod 6 is a driving component. Piston rod 6
Are driven in the horizontal direction via the seal part 7 by taking oil in and out of the hydraulic cylinder unit 5. An electrode drive shaft of a circuit breaker (not shown) is mounted at the tip of the piston rod 6. In the hydraulic operating mechanism, the electrodes in the circuit breaker can be opened and closed by operating the piston rod 6 in the horizontal direction.

[0004] In the above-mentioned drive parts, wear resistance, slidability and sealability are required as mechanical functions, and corrosion resistance and weather resistance are required as chemical functions. Abrasion resistance and slidability are important factors in maintaining excellent operation performance, and sealing is indispensable to prevent oil leakage. In addition, corrosion resistance and weather resistance have a duty to suppress the occurrence of corrosion. In order to satisfy the above functions, the surface of the drive component is hard chrome plated. Hard chromium plating has high hardness and excellent wear resistance, and also has strong corrosion resistance and weather resistance. In addition, there is a cost merit such as low cost. For this reason, it is widely used as a film formed on the surface of a drive component.

[0005]

When hard chromium plating is formed, a plating solution composed of chromic acid and sulfuric acid containing hexavalent chromium is used. The substance falls under the category of specially controlled substances. Therefore, in recent years, in which not only the effect on the human body but also the consideration for the global environment has become a problem, there is a social demand to reduce the amount of hard chrome plating used.

[0006] The present invention has been proposed in view of the above points, and an object of the present invention is to provide a high level of wear resistance, slidability, sealability, corrosion resistance and weather resistance without using hard chromium plating. To provide a drive component that contributes to the reduction of the use of a plating solution containing hexavalent chromium by adopting a film having a property to improve the safety for the human body and environmental friendliness, and a method of manufacturing the same. It is. Another object of the present invention is to provide a high-quality power switchgear that ensures good operation reliability by incorporating a drive component having excellent functions.

[0007]

In order to achieve the above object, an invention according to claim 1 is a drive component that is driven mechanically, wherein a surface of the component is based on a carbide layer and a resin layer is formed on the base. A composite film formed by impregnation is coated, the carbide layer is made of a WC-Co-Cr-based or CrC-NiCr-based carbide material, and the resin layer is made of a siloxane-bonded or fluorine-based resin material. It is characterized by. A sixth aspect of the present invention is directed to a method of manufacturing a mechanically driven drive component, which is a method of manufacturing the drive component of the first aspect, wherein the surface of the component is WC-Co.
-A coating process of coating a Cr-based or CrC-NiCr-based carbide material, an impregnation process of impregnating a component surface with a siloxane-bonded or fluorine-based resin material, and a finishing process of finishing the component surface. I do. In the first and sixth aspects of the present invention, since the composite coating is based on a carbide layer having a high hardness, excellent wear resistance can be ensured. In addition, the resin layer impregnated in the composite coating not only has excellent corrosion resistance and weather resistance, but also has good lubricity, so that the composite coating can have high slidability. Further, in the present invention, a plating solution containing hexavalent chromium is not used in producing the composite film. For this reason, there is no fear of adversely affecting the human body and the global environment, and safety and environmental harmony are improved.

According to a second aspect of the present invention, in the driving component according to the first aspect, the carbide layer is made of powder having a particle size of 60 μm or less. According to a seventh aspect of the present invention, there is provided a method of manufacturing a driving component according to the sixth aspect of the present invention, wherein a carbide material made of powder having a particle size of 60 μm or less is used in the coating process. The component surface is coated by high-speed gas flame spraying. According to the second and seventh aspects of the present invention, by forming the carbide layer from a powder having a particle size of 60 μm or less, it is possible to realize a dense film having few pores and excellent adhesion. Therefore, the carbide layer is less likely to be broken or peeled off, and a high-performance composite film can be obtained.

According to a third aspect of the present invention, in the driving component according to the first or second aspect, when the carbide layer has pores, the pores are impregnated with the resin layer. According to an eighth aspect of the present invention, there is provided a method of manufacturing a drive component according to the sixth or seventh aspect, wherein the component that has undergone the coating process is siloxane-bonded in the impregnation process. It is characterized by being immersed in a solution in which a resinous or fluorine-based resin material is dissolved. According to the third and eighth aspects of the present invention, even if pores are present in the carbide layer, the pores can be impregnated with a resin material to close the pores. Therefore, occurrence of pitting due to pores can be suppressed, and extremely excellent corrosion resistance and weather resistance can be exhibited. The pitting corrosion is a phenomenon in which, when pores existing in the film penetrate to the base material, the base material is corroded and the film is destroyed.

[0010] The invention of claim 4 is the invention of claim 1, 2 or 3.
In the above-mentioned drive component, the surface roughness of the composite coating is provided at a maximum height Rmax of 5 μm or less. In the fourth aspect of the present invention, by setting the surface roughness of the composite coating to a maximum height Rmax of 5 μm or less, excellent sealing properties can be obtained.

According to a fifth aspect of the present invention, there is provided a switchgear for electric power, comprising a driving component according to the first, second, third or fourth aspect. According to the fifth aspect of the present invention, by providing the drive component according to any one of the first to fourth aspects, a power switchgear having high operation reliability can be obtained.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION [Configuration] Hereinafter, typical embodiments of the present invention will be specifically described. The drive component according to the present embodiment is applied to a piston rod 6 used for a hydraulic operating mechanism of a power switchgear. As shown in FIG. 1, a composite film 11 is formed on the surface of a base material 10 made of CrMo steel.
Is coated. The composite film 11 is constituted by impregnating a resin layer 13 with a carbide layer 12 as a base, and the surface roughness is set to a maximum height Rmax of 5 μm or less.

The carbide layer 12 is a WC-Co-Cr-based or CrC-NiC
It is made of an r-based carbide material and has a laminated structure having fine pores 12a. Some of the pores 12a penetrate or continuously connect to the base material 10. Also,
The resin layer 13 is made of a siloxane bond-based or fluorine-based resin material, and is impregnated in the pores 12a. In addition,
The siloxane-bonded resin is a (Si-O-Si) -bonded resin.

[Manufacturing Method] The composite coating 11 described above is manufactured as follows. First, as a stage prior to the production of the composite film 11, the threaded portion 2 is machined at the end of the substrate 10 (see FIG. 2), and the substrate 10 is degreased.

A composite coating 11 is applied to the sliding surface 1 which has been subjected to the degreasing treatment.
Is formed, the sliding surface 1 is blasted with a steel grid to form a WC-Co-Cr having a particle size of 60 μm or less.
A coating having a thickness of about 100 μm is formed by high-speed gas flame spraying using a base powder or a CrC—NiCr base powder (coating process).

Subsequently, the piston rod 6 is immersed in a siloxane-bonded or fluorine-based resin solution for about one hour to impregnate and harden the resin-based material 13 into the pores 12a present in the carbide-based material 12. (Impregnation process). The surface of the composite film 11 thus formed is machined to a film thickness of 50 μm. Then, it is super-polished with a # 3000 grindstone, and the surface roughness of the entire composite coating 11 reaches the maximum height R
Finish until max is 5 μm or less (finishing process). Then, final impregnation for sealing the pores 11a is performed, and final surface polishing is performed, so that the composite coating 11 is completed.

[Function and Effect] In the embodiment manufactured as described above, the WC-Co-Cr or Cr
By using the C-NiCr-based carbide layer 12 as a base, an extremely high film hardness of 1000 or more in Hv can be obtained. Incidentally, the hardness of the hard chrome plating is about 900 in Hv. The present embodiment having such a high hardness can exhibit excellent wear resistance.

FIG. 3 is a bar graph showing the relative abrasion of coatings of different constituent materials. The test piece was coated with a hard chromium plating, a TiN film, a film made of a WC-Co-Cr material, and a film made of a CrC-NiCr material.
Various types of tips were prepared, and the wear test was performed by rotating the tips on a ring. As a result, when the wear amount of the hard chromium plating was 1.0, the TiN film was 2.0. On the other hand, WC-Co-Cr and CrC-N
Each of the iCr-based coatings was 0.1, which proved to have extremely excellent wear resistance.

Further, in this embodiment, the carbide layer 1
2 is made of a powder having a particle size of 60 μm or less, so that it is dense and can reduce the number of pores 12a, and is excellent in adhesion. Therefore, destruction and peeling of the carbide layer 12 are less likely to occur, and the composite film 11 can exhibit a high function stably.

The siloxane-bonded or fluorine-based resin material constituting the resin layer 13 has good lubricity,
High slidability can be given to the composite coating 11. Further, the resin material has excellent corrosion resistance and weather resistance.
In addition, the resin layer 13 impregnates the pores 12a of the carbide layer 12 and closes the pores 12a. Therefore, the pore 1
The occurrence of pitting corrosion due to 2a can be reliably prevented, and the corrosion resistance and weather resistance are significantly improved.

Here, with reference to FIG. 4, the corrosion resistance and the weather resistance of the films having different constituent materials will be described. FIG. 4 shows the relative pitting densities when a plurality of types of coatings were subjected to a 20-hour exposure test during salt spray. The test subjects were a hard chrome plating, a TiN film, a WC-Co-Cr-based film composed of a single-layer film of a carbide-based material, and CrC-Ni.
These are a Cr-based coating and four composite coatings corresponding to the composite coating 11 of the present embodiment. The combination of a carbide material and a resin material in the composite coating is WC-Co-Cr-based and siloxane-bonded, WC-Co-Cr-based and fluorine-based,
C-NiCr type and siloxane bond type, CrC-NiCr
System and fluorine system. The thickness of each coating was 3 μm for hard chrome plating and TiN coating, and the remaining coatings were all 50 μm.
m. As is clear from FIG. 4, the pitting density of the TiN film and the single-layer film of the carbide-based material are high, but the pitting density of the composite film of the carbide material and the resin material is smaller than that of the hard chrome plating. ing. This indicates that the composite coating 11 of the present embodiment has the same level of corrosion resistance and weather resistance as hard chrome plating.

In order to ensure the oil sealing of the composite coating 11, it is important to regulate the surface roughness of the coating. FIG. 5 is a graph showing the relationship between the surface roughness (maximum height Rmax) of the film and the amount of oil leakage.
As a result of standing for 2 weeks at gf / cm ² , the amount of oil leakage was 0.1 cc or less when Rmax was 5 μm or less, and Rmax was 5 μm or less.
It shows that the following is effective. Preferably, when Rmax = 1 μm or less, the leakage amount is 0.05 c.
c or less, and the sealing performance is further improved. That is, the composite coating 11 of the present embodiment can obtain excellent sealing properties by defining the surface roughness to be 5 μm or less at the maximum height Rmax.

In the manufacturing process of the composite film 11 described above, a plating solution containing hexavalent chromium is not used. For this reason, there is no possibility of adversely affecting the human body and the global environment. According to the present embodiment, by forming the composite coating 11, abrasion resistance equivalent to hard chrome plating,
It can have slidability, sealability, corrosion resistance and weather resistance. In addition, since a plating solution containing hexavalent chromium is not used, it is possible to contribute to reduction of the plating solution, and it is possible to improve safety for human bodies and environmental harmony. The piston rod 6 having the composite coating 11 formed on the surface thereof
Can have excellent operation reliability, and by using this for a hydraulic operating mechanism, a high-quality power switchgear can be obtained.

[Other Embodiments] The drive parts of the present invention are not limited to the piston rod 6 described above, but are applied to seal rods for sealing oil and other drive parts for power switching devices. It goes without saying that you can do it.
Further, the drive component of the present invention can be applied to devices other than the power switching device.

[0025]

As described above, according to the present invention,
Rather than hard chromium plating, a high level of wear resistance, sliding properties, sealability, corrosion resistance and weather resistance are achieved by coating the component surface with a composite layer based on a carbide layer and impregnated with a resin layer. Provided is a drive component capable of securing a coating film provided, contributing to a reduction in the use of a plating solution containing hexavalent chromium, and improving safety for the human body and environmental friendliness, and a method for manufacturing the same. Can be. In addition, by incorporating such a driving component, a high-quality power switchgear that ensures good operation reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a typical embodiment of the present invention.

FIG. 2 is a schematic diagram of a piston rod to which the embodiment is applied.

FIG. 3 is a bar graph showing the relative wear properties of the coating.

FIG. 4 is a bar graph showing the relative pitting density of the coating.

FIG. 5 is a graph showing the relationship between the surface roughness (maximum height Rmax) of a film and the amount of oil leakage.

FIG. 6 is a configuration diagram of a hydraulic operation mechanism of a general power switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sliding surface 2 ... Screw part 3 ... Pump unit 4 ... Accumulator 5 ... Hydraulic cylinder unit 6 ... Piston rod 7 ... Seal part 10 ... Substrate 11 ... Composite coating 12 ... Carbide layer 12a ... Pore 13 ... Resin layer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ryo Kubo 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term in Toshiba Hamakawasaki Plant (reference) 4K031 AA02 AA06 AB02 AB08 AB09 BA01 BA04 CB45 DA01 FA09 4K044 AA02 AB03 AB05 BA18 BA21 BB03 BB14 BC01 BC02 CA07 CA11 CA53 CA59

Claims (8)

[Claims] 1. A mechanically driven driving component, wherein the component surface is coated with a composite film based on a carbide layer and impregnated with a resin layer, and the carbide layer is formed of WC-Co-Cr. System or CrC-
A drive component comprising a NiCr-based carbide material, wherein the resin layer comprises a siloxane-bonded or fluorine-based resin material. 2. The drive component according to claim 1, wherein said carbide layer is made of a powder having a particle size of 60 μm or less. 3. The drive component according to claim 1, wherein when the carbide layer has pores, the pores are impregnated with the resin layer. 4. The driving component according to claim 1, wherein the composite coating has a surface roughness of 5 μm or less at a maximum height Rmax. 5. A power switchgear comprising the drive component according to claim 1, 2, 3, or 4. 6. A method of manufacturing a mechanically driven drive component, comprising: WC-Co-Cr or CrC-NiCr on the surface of the component.
A method for manufacturing a drive component, comprising: a coating process for coating a system carbide material; an impregnation process for impregnating a siloxane-bonded or fluorine-based resin material on a component surface; and a finishing process for finishing a component surface. 7. The coating process wherein the particle size is 60.
7. The method for manufacturing a drive component according to claim 6, wherein the surface of the component is coated with a carbide material composed of powder having a size of not more than μm by high-speed gas flame spraying. 8. The method according to claim 6, wherein in the impregnation process, the component that has undergone the coating process is immersed in a solution in which a siloxane-bonded or fluorine-based resin material is dissolved. .