PUMP ROD MANUFACTURE METHOD Russian patent published in 1995 - IPC

FIELD: oil mechanical engineering. SUBSTANCE: method provides for heading from both ends of rod rolling heads with nipple, bead, square and transforming into body of rod fillet, rod thermal treatment, its straightening, heads machining and surface hardening of rod ends with head, nipple, bead, square, fillet and adjacent to them parts of rod body, not covering average by length part of rod body. Surface hardening is exercised by methods of chemical thermal treatment, that is carried out simultaneously with heat treatment of rest part of rod body. EFFECT: improved design. 3 cl, 1 dwg, 3 tbl