Patent ID: 6682610
Filing Date: 2004-01-27
Classification: B21C,B60G,C21D,F16F

Abstract:
A manufacturing method for making a hollow stabilizer, comprising:a primary pipe manufacturing process for subjecting a seam-welded pipe to continuous hot reduction working, thereby obtaining a primary pipe, and winding the primary pipe in a coil; a cold drawing process for subjecting the primary pipe to cold drawing so that a rate of reduction in area is not lower than 30%, thereby obtaining a thick-walled pipe having a wall thickness ratio of 0.20 to 0.27 and a tensile strength of 800 N/mm2 to 1,000 N/mm2, said wall thickness ratio of 0.20 to 0.27 being higher than a wall thickness ratio of the seam-welded pipe; a bending process for bending the thick-walled pipe, obtained in the cold drawing process, into a desired stabilizer shape in a cold state; an annealing process for subjecting the thick-walled pipe to stress relieving annealing at a temperature of 300Â° C. to 450Â° C., after the bending process; and a shot peening process for shot-peening the thick-walled pipe while the pipe is kept at a temperature of 300Â° C. to 400Â° C., after the annealing process.