... number, so does the depth of the parallelism.4) The spindle is made of 42Crmo, which is conducted by the special ... and wear resistance of spindle. So spindle longevity can be extended 1-2 times.5) By optimizing mold design, precision processing, vacuum quenching ... programme, keeping with the speed of pipe making, with high precision within 1mm.Effective protect the equipment from the damage in ...