EP 2676746 B1 20181024 - METHOD FOR STRAIGHTENING
Title (en)
METHOD FOR STRAIGHTENING
Title (de)
BEGRADIGUNGSVERFAHREN
Title (fr)
PROCÉDÉ DE DRESSAGE
Publication
Application
Priority
- JP 2011028905 A 20110214
- JP 2012000896 W 20120210
Abstract (en)
[origin: EP2676746A1] 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.
IPC 8 full level
B21D 3/02 (2006.01)
CPC (source: EP KR US)
B21B 23/00 (2013.01 - US); B21D 3/02 (2013.01 - KR); B21D 3/04 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2676746 A1 20131225; EP 2676746 A4 20160907; EP 2676746 B1 20181024; BR 112013017469 A2 20180904; BR 112013017469 B1 20200616; BR 112013017469 B8 20200929; CN 103370149 A 20131023; JP 2012166233 A 20120906; JP 5462202 B2 20140402; KR 20130118960 A 20131030; MX 2013008855 A 20130814; MX 363214 B 20190315; TW 201302337 A 20130116; TW I538751 B 20160621; US 2013327110 A1 20131212; WO 2012111291 A1 20120823
DOCDB simple family (application)
EP 12747318 A 20120210; BR 112013017469 A 20120210; CN 201280008920 A 20120210; JP 2011028905 A 20110214; JP 2012000896 W 20120210; KR 20137021946 A 20120210; MX 2013008855 A 20120210; TW 101104718 A 20120214; US 201213985296 A 20120210