COLD FINISH SEAMLESS STEEL PIPE FOR DRIVE SHAFT AND METHOD FOR PRODUCING THE SAME

• Main Author: YAMAMOTO TADAYUKI
• Format: Patent
• Language: English
• Published: 19.11.2008
• Subjects: ALLOYS; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; VEHICLES IN GENERAL

The quantity of S contained in designing steel component is reduced, a stretch reducer makes a rolling roll to have a hole type profile closer to a true circle in sizing rolling, and a pipe is made to have an appropriate profile ratio (ratio between the radius of curvature of the inner surface and the average inner radius) at the position corresponding to an edge portion. Even when the inner surface of a blank pipe subjected to sizing rolling is creased, a predetermined thickness workability is ensured in subsequent cold elongation, and therefore the pipe is applicable as a drive shaft for an automobile and can be used as a high strength hollow member excellent in fatigue strength and most suitable for reducing the weight and ensuring silence. Consequently, a drive shaft for an automobile can be produced inexpensively and efficiently.