Manufacturing Process of Small/Medium-sized Precision Bearing Steel Tubes

The conventional manufacturing processes for bearing steel tubes employed both abroad and at home are reviewed. The present manufacturing processes for the said tubes domestically adapted are described, covering typical manufacturing steps and technological features. Compared with the foreign-used conventional bearing tube manufacturing process of 3-high rolling plus cold-rolling（drawing）, the process of piercing plus cold-rolling（drawing） features further simplified production equipment, less initial investment, shorter process flow, higher yield and more cost-effectiveness.