Thick-walled bushes can be cast to improve the friction performance by pouring a layer of bearing alloy (called bearing lining) on the inner surface of the bush. In order to make bearing alloy and
bearing bush stick well, various forms of mortise, groove or thread are usually made on the inner surface of bearing bush. Thin - wall bearing bush can be produced in large quantity by continuous rolling of bimetallic plate.
Powder metallurgy involves mixing basic materials, such as powdered iron or copper, with graphite and then pressing and sintering. Its pores can store lubricating oil, called oily bearing.
Bearing bush material is usually soft, the inner cylinder is not suitable for grinding, can be boring, diamond boring, scraping or grinding process. Grinding should not use the method of matching with the shaft diameter, but should use a special lapping rod of the same size as the shaft bush hole. Scraping is mostly used for some tile bearings, scraping with wide blade scraper machine. When scraping by hand, the scratch should be shallow. Bearing bush with complicated inner surface should be boring in a special way according to the specific shape.
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