US Patent 7100410 Method of manufacturing seamless tube
Patent 7100410 was granted and assigned to Sumitomo Metal Industries on September, 2006 by the United States Patent and Trademark Office.
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A method of manufacturing a seamless tube by the invention can duly control the rotary forging effect without miss-rolling such as defective onset engagement with rolls by satisfying either of (1)–(3) formulas below, dependent on a given range of roll diameter ratio Dg/D1, prevent the occurence of internal surface flaws at the top of the work material attributable to deteriorated hot workability, and further prevent the occurrence of said flaws over the remaining length without altering parameters for piercing-rolling process. Thus, the invention can be widely utilized as an excellent manufacturing method for said tube:
US Patent 07100410 Method of manufacturing seamless tube US Patent 7100410 Method of manufacturing seamless tube
US Patent 07100410 Method of manufacturing seamless tube
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