Copper alloy bearing holding frame and its preparation method

Abstract

The present invention relates to a bearing retainer. In order to make bearing retainer possess good mechanical property and raise utilization rate of material said ivnention provides a copper alloy bearing retainer and its preparation method. The described bearing retainer is made up by adopting superplastic forming method, and its texture possesses continuous streamline structure characteristics, and its streamline form and member form are identical in alignment, and it has equaxed crystal, and its grainsize scale is less than or equal to 15 micrometer.

Description

Technical field: [0001] The invention relates to a bearing cage, and in particular provides a copper alloy superplastic formed bearing cage and a preparation method thereof. Background technique: [0002] Bearings are the main basic parts of the machinery industry. The total annual output of the world is close to 9 billion sets. Among them, the second, third, sixth, seventh, and ninth types of bearings mostly use solid cages, and the thickness of the cage isolation layer (also called lintel) It is very thin, and usually the force on the cage is not large, but at high speed, strong vibration and change of motion direction, due to the increase of the inertial force of the rolling elements, the pressure on the rolling elements on the cage increases and the wear increases. Due to the development of various machinery, faster speed and higher power are required, and higher requirements are placed on the bearing capacity of the bearing; at the same time, the structure of the bearin...

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Problems solved by technology

On the other hand, the current bearing cage is usually made of centrifugal casting or other casting tube blanks. The inner and outer circles are cut multiple times, and the end faces and milling pockets are finally formed. The material utilization rate of the process is only 20%. For a country with scarce copper resources like my country, the waste is huge

For this reason, someone proposed a method to prepare bearing cages by using liquid die forging technology or squeeze casting. The process is to inject liquid metal into the cavity, and the pressure is generated by the closing of the upper and lower dies. The liquid metal crystallizes and forms under pressure. Although this method has a high material utilization rate, it cannot avoid defects such as inclusions in casting, coarse segregated grains, brittle dendrites, etc., which is easy to cause waste products, and is far from meeting the standard requirements stipulated by the industry association. Moreover, liquid copper alloy The temperature is high, and it has a hot-melt erosion effect on the mold material. The requirements for the mold material are very strict, thus increasing the cost of the mold, and the life of the mold is also very short, which is not suitable for large-scale industrial production.

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