Once-fired molding process for powder metallurgy brake shoes
A powder metallurgy and molding process technology, applied in the field of powder metallurgy brake shoe one-time sintering molding process, can solve the problems of cumbersome process, waste of powder metallurgy friction material, short service life, etc. The effect of prolonging the service life
Inactive Publication Date: 2011-07-20
江苏滔海机械制造有限公司
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Problems solved by technology
[0004] In order to solve the problem that powder metallurgy brake shoes in the prior art adopt cumbersome riveting and bolt connection methods, short service life and waste of powder metallurgy friction materials
Method used
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[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] A powder metallurgy brake shoe one-time sintering forming process is characterized in that it includes the following steps:
[0021] (1) Degrease and sandblast the upper surface of the steel base plate of the brake shoe at room temperature. When oiling the upper surface of the steel base plate, the steel shot used is a stainless steel shot with a diameter of 0.3mm. After the treatment is completed Make the surface of the steel bottom plate free of oil, fully activated and roughened, and free of scale;
[0022] (2) Use oxyacetylene flame to heat and preheat the upper surface of the steel base plate of the brake shoe, so that the temperature of the upper surface of the steel base plate reaches 300°C;
[0023] (3) Spray the low-melting-point Fe-30 iron-based alloy powder on the treated upper surface of the steel base plate with an oxyacetylene spray gun, with unif...
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Abstract
The invention discloses a once-fired molding process for powder metallurgy brake shoes, comprising the following steps of: (1) deoiling and blasting an upper surface of a steel base plate of the brake shoe at constant temperature; (2) heating and warming up the steel base plate of the brake shoe by oxyacetylene flame; (3) spraying low-melting point powdered alloy Fe-30 on the upper surface of thesteel base plate by oxyacetylene spraying welding torch; (4) arranging the steel base plate in a mold, adding powder metallurgy composite ingredients on the upper surface of the steel base plate and pre-press forming; (5) placing the pre-press formed semi-finished products in a carbon monoxide calcining oven for baking; (6) taking out the products, cooling, and spraying plastics on the surface thereof. The invention solves the problems of complicated connections of riveting and screw bolt, short service life, and powder metallurgy friction material waste, generated when powder metallurgy brake shoes are produced by the prior art. A process for calcining and molding the composite ingredients of powder metallurgy with the steel base plate is provided, which greatly improves the utilization rate of the powder metallurgy friction liner.
Description
technical field [0001] The invention relates to the manufacture of accessories for automobile brake devices, in particular to a powder metallurgy brake shoe piece sintering molding process. Background technique [0002] Due to the advantages of powder metallurgy friction materials such as stable friction coefficient, good wear resistance and heat resistance, and low production cost, powder metallurgy materials are widely used in automobile brake devices. Powder metallurgy friction material is resistant to high temperature and will not fail at 700°C or above, so it is especially popular in areas with high braking frequency, heavy load, fast heating of braking components and high wear. [0003] For the brake shoe block or brake shoe piece, in the manufacturing process, riveting and bolt connection have been used for a long time, which is not only complicated in process, but also has a short service life of the brake lining. Once the rivets are exposed, they need to be renewed...
Claims
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IPC IPC(8): B22F3/16
Inventor 李建秋吴德宣
Owner 江苏滔海机械制造有限公司