JP3028139B2 - Air tool blade - Google Patents

Description

The present invention relates to a blade for an air tool (hereinafter referred to as an air tool vane) using compressed air as a power source, such as an air driver, an impact wrench, or an air grinder. Is an air tool vane whose output does not decrease even during operation without lubrication, that is, it has sliding stability, durability, that is, wear resistance and fatigue resistance, and excellent long-term dimensional stability. It is the invention which concerns on.

(B) Conventional technology As a material for a vane for an air tool, a phenolic resin laminate based on cotton canvas has conventionally been used, but this requires lubrication to compressed air and operates without lubrication. Disadvantages such as reduced output due to poor rotation, burn-in, and delamination.

In order to supply oil to compressed air, it is necessary to provide an oil supply tank in the air line and periodically replenish lubricating oil, and since the oil-containing air is discharged, the working environment deteriorates, There are many problems, such as not only causing contamination of clothes and body, but also restricting use on an assembly line or a painting line in a clean room for electronic devices and the like.

In addition, the phenolic resin laminate has poor water absorption, and causes moisture swelling due to moisture (condensed water) contained in the compressed air during use, or moisture swelling due to moisture in the air during long-term shutdown, resulting in poor rotation. In some cases, the output may decrease, or rotation may not be possible.

Furthermore, phenolic resin laminates have the drawback of large dimensional variation because they are entirely machined, while nylon as a vane for air tools that can be operated without lubrication
66, or vanes based on polyamideimide are on the market, but all have disadvantages such as high water absorption, poor dimensional stability during moisture absorption, and the possibility of poor rotation.

(C) Problems to be Solved by the Invention As described above, the conventional air tool vane requires many lubrications, and has many disadvantages and poor rotation due to dimensional stability due to hygroscopic expansion. Had a problem. The present invention solves these problems, enables oil-free operation, and has a small hygroscopic swelling, and has excellent wear resistance and dimensional stability. It has been completed for the purpose of providing.

(D) Means for Solving the Problems The configuration of the air tool vane for obtaining high-speed rotation using compressed air as a power source according to the present invention will be specifically described below.

As matrix resins, there are polyphenylene sulfide (PPS), polyacetal (POM), polyether aromatic ketone (PEEK), etc., which can be precisely molded by injection molding and have low water absorption and are expected to have dimensional stability. PPS has insufficient toughness, and POM has insufficient wear resistance. As a result of a series of tests, it has been found that PEEK is the best for exhibiting stable performance as a vane.

As the reinforcing fiber, aromatic polyamide fiber (meta-based or para-based) that has low heat resistance and excellent sliding properties,
It has been found that one or more of heat-resistant reinforcing fibers such as carbon fiber (either pitch-based or PAN-based) or potassium titanate fiber may be used in combination.

Furthermore, as a solid lubricant, it is effective to use any one or a combination of two or more of ethylene tetrafluoride resin (hereinafter referred to as PTFE), graphite, molybdenum disulfide, tungsten disulfide, and boron nitrogen. Also confirmed in the experiment.

The mixing ratio of each component of the air tool vane according to the present invention is such that PEEK as a matrix resin is 95 to 50 parts (weight ratio), the amount of reinforcing fiber added is 5 to 50 parts, and the amount of solid lubricant is 5 to 50 parts. 30 parts is appropriate. When the reinforcing fiber is less than 5 parts, there is no reinforcing effect, and when it is more than 50 parts, the uniform dispersion (commonly called wetting phenomenon) of the fiber and the resin is deteriorated and the strength is reduced. When the amount of the solid lubricant is 5 parts or less, there is no lubricating effect, and there is a problem in long-term operation without lubrication. When the amount of the solid lubricant exceeds 30 parts, the toughness of the vane is reduced and early fracture may occur.

Although not essential, it is also recognized that the addition of 10 parts or less of a lubricating aid such as zinc oxide, zinc sulfide, and magnesium oxide improves the sliding characteristics and has an effect on rotational stability.

The vane for an air tool also has an advantage that it can be precisely molded into a predetermined shape by ordinary injection molding.

(E) Action The air tool vane according to the present invention for obtaining high-speed rotation using compressed air as a power source is mainly composed of PEEK which is a matrix resin as described in Examples described later, and is blended with an appropriate amount of a suitable reinforcing fiber and a solid lubricant. The disadvantage of the conventional phenol resin vane was improved by injection molding, and a remarkable improvement in performance as an air tool was observed.

(F) Example Example (1) PEEK (VICTREX PEEK manufactured by ICI) 65% Aromatic polyamide fiber (Technola manufactured by Teijin Limited) 15% PTFE (Lubron L-2 manufactured by Daikin Industries, Ltd.) 15 5% zinc oxide (Zinc Hua, manufactured by Mitsui Kinzoku Kogyo KK) was mixed with a Henschel mixer and pelletized by a twin-screw kneading extruder.

Example (2) PEEK (same as above) 70% Carbon fiber (Mitsubishi Chemical Corporation, Dialead) 15% PTFE (same as above) 15% Comparative Example (1) PEEK (same as above) 39% Aromatic polyamide fiber (same as above) 55 % PTFE (Same as above) 5% Zinc oxide (Same as above) 1% Comparative example (2) PEEK (Same as above) 40% Carbon fiber (Same as above) 55% PTFE (Same as above) 5% Comparative example (3) Polyphenylene sulfide resin (Ltd.) 65% aromatic polyamide fiber (Teijin Co., Ltd., Conex) 15% PTFE (same as above) 15% zinc oxide (same as above) 5% Vane for air tool by injection molding using these pellets Was molded and subjected to a comparison test with a conventional phenolic resin laminate.

The results are as shown in the following table, in which the examples based on the composition of the present invention showed significantly improved performance as compared with the comparative examples and the conventional vanes.

(G) Effects of the Invention The vane for an air tool according to the present invention for obtaining high-speed rotation by using compressed air as a power source maintains sliding stability and wear resistance even under oil-free operation and has long-term dimensional stability. It is a vane that has the adverse effects of refueling, worsening the work environment, adverse effects on products, eliminating costs such as oil supply equipment, etc., as well as reducing moisture absorption swelling and improving wear resistance due to advances in vane materials, This is a new invention that enables long-term accurate operation, and has many features such as the ability to use a processing method excellent in precision moldability by injection molding in molding.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F01D 5/28 F01D 5/28 (72) Inventor Toru Horiuchi 1-71, Tokuan, Tsurumi-ku, Osaka-shi, Osaka Starlight Industrial Co., Ltd. In-company (72) Inventor Eiji Suzuki 1-71, Tokuan, Tsurumi-ku, Osaka-shi, Osaka Starlight Industry Co., Ltd. (56) References JP-A-63-301258 (JP, A) (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 7/100, 77/00 F01D 5/28

Claims (1)

(57) [Claims] 1. A blade for an air tool which obtains high-speed rotation by using compressed air as a power source, comprising: a thermoplastic polyether aromatic ketone; a heat-resistant reinforcing fiber;
(1) 95 to 50 parts by weight of thermoplastic polyether aromatic ketone (2) One of heat-resistant reinforcing fibers such as aromatic polyamide fiber, carbon fiber, potassium titanate fiber, etc. Or 5 to 50 parts by weight of (2) one or more of solid lubricants such as ethylene tetrafluoride resin, graphite, molybdenum disulfide, tungsten disulfide, and boron nitride. Air tool blades.