US2013327110A1PendingUtilityA1

Method for straightening

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Assignee: UCHIDA KAZUHIROPriority: Feb 14, 2011Filed: Feb 10, 2012Published: Dec 12, 2013
Est. expiryFeb 14, 2031(~4.6 yrs left)· nominal 20-yr term from priority
Inventors:Kazuhiro UchidaTadashi Kawakami
B21D 3/02B21D 3/04B21B 23/00
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Claims

Abstract

There is provided a method for straightening a steel product, comprising using hard alloy straightening rolls each made of a tungsten carbide-cobalt (WC—Co) based sintered material (hard metal), wherein the hardness of each roll is HRA85 to 87. According to this straightening method, when bends of steel product are straightened, roll wear is suppressed, defective roll mark(s) caused by the roll wear is prevented from being formed on the surface of the product being straightened, and time for changeover and/or setup of rolls is shortened to enhance the operation rate of the straightening machine, whereby the efficiency of a finishing process and, in turn, the productivity can be improved. Therefore, this method is especially effective in the case where a product to be straightened is a high-strength product such as a steel pipe for a motor vehicle air bag.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method for straightening a steel product, in which hard alloy straightening rolls are used, wherein the hardness of each hard alloy roll is HRA85 to 87. 
     
     
         2 . The method for straightening according to  claim 1 , wherein a product to be straightened is a steel pipe for a motor vehicle air bag.

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