Most of the bushings are produced by injection machines. Under high temperature and high pressure, the bushing will meet the thermal expansion and contraction, and the outer diameter will be changed. The roundness and size fail to meet the requirements, and there will be stress after the rubber is cooled, which will seriously affect the service life of the bushing. The bushing reducing machine produced by Ningbo Tianyu Machinery Equipment can perfectly solve this problem. Nearly all the top ten bushing manufacturers in China adopt their equipment.