Molding process for roller bearing retainer of railway carriage

Abstract

The invention relates to a molding process for a roller bearing retainer of a railway carriage, which comprises the following steps: taking glass fiber reinforced polyamide plastic as a raw material, and drying the raw material by a dehumidification dryer; conveying dried granular plastic into a hopper of a screw-type plastic injection molding machine, and conveying the granular plastic to a heated charging barrel through a screw to be heated and melted into a flow state; under the condition of high pressure injection, compressing the melted plastic and making the melted plastic move forward quickly; and ejecting the melted plastic by a nozzle, injecting the melted plastic into an engineering plastic retainer mold, and opening the mold to take a product out after cooling and molding. The technical proposal is simple and reasonable; the molding process has short period and can realize one-time molding; and the production process is clean and safe, saves time and protects the environment.

Description

Technical field [0001] The invention relates to a cage used for a roller bearing of a railway passenger car, in particular to a forming process of a roller bearing cage of a railway passenger car. Background technique [0002] The cage in the rolling bearing plays a variety of roles. It fixes the rolling elements and maintains a proper distance between them so that they can rotate correctly, guide the rolling elements from the load area into the non-load area, and dampen vibration. This requires the cage to have enough Its strength, toughness, wear resistance, corrosion resistance and application reliability. [0003] Railway freight car bearings originally used steel cages. This cage is mainly processed into cages from low-carbon steel plates through punching machines and lathes. The production processes include: shearing, blanking, preliminary shape, forming, punching process holes, punching Window hole, bottom punching, slope pressing, expansion, car side, smooth vibration or ...

AI Technical Summary

Problems solved by technology

Due to the influence of structure, material, stamping process and other factors, steel cages have problems such as unidirectional operation, micro cracks, processing stress and large quality fluctuations.

Shearing machines, punching machines, lathes, stress relief equipment, phosphating equipment, etc. are used in the production. The noise in the shearing and stamping production is high, and the manual operation is dangerous. The polluting industrial wastewater and waste gas are generated during the phosphating process, which constitutes hazards to employees and the environment

Therefore, at present, engineering plastic cages have appeared on the market. This cage has the characteristics of self-lubrication, wear resistance, corrosion resistance, impact resistance, good processability and light weight. Compared with steel cages However, this kind of cage has defects such as low mechanical strength, poor heat resistance, large thermal expansion coefficient, low thermal conductivity and thermal aging.

Moreover, in the production and molding process, there are problems of high water absorption, poor stability and large molding shrinkage.