JPH09212967A - Resin mechanical component for sliding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin mechanism component which reduces a coefficient of friction in a sliding operation, which reduces the wear amount of a molded body and which increases a sliding characteristic by a method wherein a face in which a surface maximum height in one out of opposite sliding faces is at a prescribed value is coated with a fluorine-based coating agent. SOLUTION: In a molded body composed of a resin, a surface maximum height (Rmax; in conformity with JIS-B-0601) in at least one out of opposite sliding faces is 1μm<=Rmax<=100μm. The effect of a fluorine-based coating agent is revealed remarkably when at least one out of the opposite sliding faces has a proper surface roughness. The fluorine-based coating agent is obtained in such a way that a fluorine-based resin is half dissolved in a solvent whose volatility is high. When a sliding part at the molded body is coated with the fluorine-based coating agent, one out of the opposite sliding faces is coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin sliding mechanical component of an information storage medium device.

[0002]

2. Description of the Related Art Conventionally, resin sliding mechanical parts such as FDD (floppy disk drive), HDD (hard disk drive), and CD (compact disk), LD (laser disk), MD used in office machines and personal computers. Computers, game consoles, music players, etc. that use (minidiscs) etc. as information media,
Chassis, traverse bases (pickup bases), trays, etc., which are internal mechanical parts of information storage media devices such as AV devices, have various greases and oils on their sliding parts in order to reduce noise and wear during sliding. Etc. are used. However, in many cases, for example, when a tray of a CD-ROM or a DVD (digital video disk) is put in and taken out tens of thousands of times, the sliding surface of the molded body is worn, which makes it difficult to put the tray in and out.

Therefore, there has been an attempt to provide the resin itself with lubricity, but the cost is high, and when the resins slide with each other, there is a problem of compatibility between the resins, so that they lack versatility.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resin sliding mechanism part for information storage medium devices, in which the coefficient of friction during sliding and the amount of wear of a molded body are drastically reduced. And

[0005]

DISCLOSURE OF THE INVENTION As a result of intensive studies to achieve the above-mentioned object, the inventors of the present invention have made a resin-made slide for an information storage medium device in which a fluorine-based coating agent is applied to a specific molded body. The present invention has been completed by discovering that the dynamic mechanical parts are dramatically superior to the conventional ones in sliding characteristics.

That is, in the present invention, the maximum surface height (Rmax) of at least one of the sliding surfaces facing each other using the fluorine-based coating agent is 1 μm or more and 100 μm or more.
A resin sliding mechanical component of an information storage medium device having a surface roughness of m or less.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The resin sliding mechanical component used in the present invention is generally a resin molding that is subjected to primary processing (injection molding, extrusion molding, blow molding, etc.) and / or secondary processing such as cutting, assembly, and surface decoration. It refers to the body. Examples of the resin molded body include thermosetting resin, thermoplastic resin, liquid crystal polymer, and the like. Especially, polyphenylene ether resin and polycarbonate resin (hereinafter referred to as PC resin) which are often used for internal chassis, trays, guide rails, etc. (Abbreviated), ABS resin, PS resin, PBT resin, POM resin and the like can be preferably used. Among them, it is preferable that the most frequently used polyphenylene ether resin is present on at least one of the opposing sliding surfaces. The polyphenylene ether resin and PC resin here are styrene-based resins such as PS resin, ABS resin, and rubber-modified polystyrene resin (HIP).
S), AS resin, styrene-maleic anhydride copolymer, and other polyblends are also included.

The molded body made of the above-mentioned resin may have a maximum surface height (Rmax) [hereinafter abbreviated as Rmax] of at least one of the opposite sliding surfaces as long as 1 μm ≦ Rmax ≦ 100 μm, but preferably 2 μm ≦ Rmax. ≤50μ
m, and more preferably 3 μm ≦ Rmax ≦ 30 μm. The effect of the fluorine-based coating agent becomes remarkable when at least one of the sliding surfaces facing each other has an appropriate surface roughness. It is presumed that this is because the fine fluorine particles contained in the coating agent finely enter the concave portions of the sliding surface and play a lubricating role. If Rmax is 1
If it is less than μm, the fine particles cannot finely enter the concave portion and cannot serve a lubricating function. Conversely, Rmax is 10
If it is larger than 0 μm, it can no longer be covered by the lubricant, and the sliding mechanism cannot function normally.
The surface roughness of the sliding surface satisfies the above-described maximum surface height, and at the same time, the center line average roughness (Ra: according to JISB 0601) of at least one of the opposing sliding surfaces is 0.5.
It is desirable that μm ≦ Ra ≦ 10 μm. Further, in order that the fluorine fine particles may appropriately enter the sliding surface, it is preferable that the distance between the concave portions and the concave portions or the distance between the convex portions and the convex portions of at least one of the sliding surfaces is 1 μm or more and 500 μm or less.

The fluorine-based coating agent used in the present invention is a highly volatile solvent such as lower perfluorocarbon or bis (trifluoromethyl) benzene, and a fluorine-based resin such as tetrafluoroethylene resin or tetrafluoroethylene-
Hexafluoropropylene copolymer resin, tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin, trifluoroethylene resin, tetrafluoroethylene-ethylene copolymer resin,
It is a semi-dissolved vinylidene fluoride resin, vinyl fluoride resin, or the like. The highly volatile solvent used here is mainly for improving the dispersibility of the fluororesin and the like when it is applied to the sliding surface, and most of the liquid must evaporate quickly after application. I won't. Among the above-mentioned fluororesins, PTFE, which has the lowest frictional properties, is the best,
The amount is preferably 1% by weight or more and 90% by weight or less in the coating agent, and the smaller the particle size, the finer the particles enter the recesses of the sliding surface, which is effective. Further, if oil such as fluorine oil or silicone oil is added in order to improve the lubricity, it becomes more durable and effective. The amount and viscosity of this oil are not particularly limited.

There is no particular limitation on the method of applying the above-mentioned fluorine-based coating agent to the sliding portion of the molded body, and it suffices to apply it to at least one of the opposing sliding surfaces with, for example, a brush.

[0011]

The present invention will be specifically described below with reference to examples. In order to show the effect of the present invention, the following two points were evaluated. (1) Friction coefficient measurement In a reciprocating friction and wear tester [manufactured by Tohoku Seimitsu Kogyo Co., Ltd.], the molded product A was placed on the molded product B and a load of 0.5 kg was applied as shown in FIG. It was slid to the left and right at a speed of s by 10 mm each way. At this time, the foot portion of the molded product A and an arbitrary surface portion of the molded product B are sliding surfaces facing each other. The coefficient of friction was measured after the first and 10,000th reciprocating motions. (2) Wear depth measurement Three-dimensional surface roughness profile measuring machine [Cercom 570A-3D:
Manufactured by Tokyo Seimitsu Co., Ltd., the maximum wear depth of the sliding surfaces of the molded products A and B after the reciprocating motion of 10,000 times was measured.

Next, a molded product sample will be described as follows. All molded products are injection molding machines (IS80EP
N: R of the sliding surface after being obtained with Toshiba Machine Co., Ltd. and before the test
Max and Ra were measured by a three-dimensional surface roughness profiler. [Rmax: stipulated in JISB0601] Polyphenylene ether resin: Zylon X333V [manufactured by Asahi Kasei Kogyo KK] Molding temperature / mold temperature (° C): 270/70 Rmax (μm): 12 Ra (μm): 0.9 Polyphenylene ether Resin: Zylon X504V (manufactured by Asahi Kasei Co., Ltd.) Molding temperature / mold temperature (° C.): 290/80 Rmax (μm): 14 Ra (μm): 3.2 Polyphenylene ether resin: Zylon 340V [Asahi Chemical Industry Co., Ltd. )] Molding temperature / mold temperature (° C.): 260/70 Rmax (μm): 2 Ra (μm): 0.5 PC resin: Lexan LGK3020 [manufactured by Japan GE Corp.] Molding temperature / mold temperature ( ° C): 300/90 Rmax (μm): 15 Ra (μm): 4.0 PBT resin: Duranex 751SA [ Molding temperature / mold temperature (° C.): 240/70 Rmax (μm): 10 Ra (μm): 1.3 ABS resin: Toyolac 824V-F01 (manufactured by Toray Industries, Inc.) Molding Temperature / mold temperature (° C): 220/40 Rmax (μm): 1 Ra (μm): 0.08 PC / ABS resin: Multilon TS3814 (manufactured by Teijin Chemicals Ltd.) Molding temperature / mold temperature (° C) : 240/50 Rmax (μm): 2 Ra (μm): 0.1 POM resin: Tenac LM511 (manufactured by Asahi Kasei Co., Ltd.) Molding temperature / mold temperature (° C.): 190/80 Rmax (μm): 2 Ra (μm): 0.2 Next, the fluorine-based coating agent and the grease will be described as follows.

I. Dry Surf MD-2000 [Co., Ltd.
Harves] Main components: PTFE [2% by weight], fluorine oil [8% by weight], bis (trifluoromethyl) benzene [45% by weight], lower perfluorocarbon [45% by weight] II. Dry Surf A-6063 [manufactured by Harves Co., Ltd.] Main components: PTFE [2% by weight], fluorine oil [8% by weight], lower perfluorocarbon [90% by weight] III. Dry Surf A-7129 [Harves Co., Ltd.] Main components: PTFE [2% by weight], fluorine oil (viscosity up) [8% by weight], lower perfluorocarbon [90% by weight] IV. Morikort EM-30L [Dow Corning Corporation]
Manufactured] A general-purpose poly-α-olefin grease.

[0014]

Examples 1 to 6 Dry Surf MD-2000 was evenly applied to the sliding surface of the molded product B with the molded product A with a brush and allowed to stand for 1 minute for evaluation.

[0015]

[Table 1]

[0016]

[Comparative Example 1] Evaluation was performed without applying grease or other lubricants.

[0017]

[Comparative Examples 2 to 7] Molycoat EM-30L was evenly applied to the sliding surface of the molded product B with the molded product A with a brush and left for 1 minute for evaluation.

[0018]

[Table 2]

[0019]

[Comparative Example 8] Grease and other lubricants were not applied,
An evaluation was performed.

[0020]

[Comparative Examples 9 and 10] The sliding surfaces of the molded product B and the molded product A were respectively Molycoat EM-30L and Dry Surf MD-2.
000 was evenly applied with a brush and left for 1 minute for evaluation.

[0021]

[Table 3]

As is clear from Table 1, Table 2 and Table 3, a fluorine-based coating agent (Drysurf MD-2000)
Examples 1 to 6 show excellent sliding characteristics (friction coefficient, wear depth) as resin-made sliding mechanical parts of information storage medium devices as compared with Comparative Examples 1 to 10.

[0023]

[Example 7] The same evaluations as in Example 1 were carried out except that dry surf A-6063 was used as the lubricant.

[0024]

[Example 8] The same evaluations as in Example 1 were carried out except that the lubricant was Dry Surf A-7129.

[0025]

[Table 4]

As is clear from Table 4, the dry surf A
It was demonstrated that the same effects as in Example 1 were obtained with -6063 and Dry Surf A-7129, and that the same effects were obtained with any fluorine-based coating agent.

[0027]

The resin sliding mechanical component of the information storage medium device of the present invention exhibits sliding characteristics superior to those of the conventional sliding mechanical component.

[Brief description of drawings]

FIG. 1 is a perspective view of a model molded product A assuming a tray and a guide rail that are internal mechanical parts of an information storage medium device.

FIG. 2 is a perspective view of a flat type model molded product B assuming a traverse base (pickup base) which is an internal mechanical component of an information storage medium device and a chassis.

FIG. 3 is a view assuming a state when an internal mechanical component of the information storage medium device is set up, and is a view of molded products A and B as viewed from the side.

Claims (2)

[Claims] 1. The maximum surface height (Rmax: in accordance with JIS B 0601) of at least one of the sliding surfaces facing each other using a fluorine-based coating agent is 1 μm.
A resin sliding mechanical component for an information storage medium device having a surface roughness of not less than m and not more than 100 μm. 2. The resin sliding mechanical component of the information storage medium device according to claim 1, wherein at least one of the opposing sliding surfaces is made of polyphenylene ether resin.