APPARATUS FOR SIZING TUBE END PORTIONS

摘要

manufacture of tubes for oil industry. SUBSTANCE: apparatus includes housing with separator in which idle cone rollers are arranged. Said rollers rest by their cone surface upon supporting head in the form of cone pressure sleeve. Rod with supporting shoulder in the form of truncated cone is coaxially arranged in housing. Diameter of rod along length of sizing portion is equal to inner diameter of tube. Less diameter of truncated cone of shoulder in plane of tube end is equal to diameter of cut thread with allowance for working. EFFECT: enhanced strength and operational parameters of threaded joint of tubes. 1 dwg