Assembly and spot stamping of ball bearings and spherical plain bearings . spot stamping by spherical indentations with 2 mm diameter ball 滚珠轴承和关节轴承的组装和点冲压.用直径为mm的球做球形压痕的点冲压加工
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Assembly and spot stamping of ball bearings and spherical plain bearings . spot stamping by spherical indentations with 4 mm diameter ball 滚珠轴承和关节轴承的组装和点冲压.用直径为4 mm的球做球形压痕的点冲压加工