EP 4121571 A1 20230125 - METHOD FOR PRODUCING A SCREW, AND SCREW
Title (en)
METHOD FOR PRODUCING A SCREW, AND SCREW
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER SCHRAUBE UND SCHRAUBE
Title (fr)
PROCÉDÉ DE FABRICATION D'UNE VIS ET VIS
Publication
Application
Priority
- DE 102020107194 A 20200316
- EP 2021056712 W 20210316
Abstract (en)
[origin: CA3172948A1] The invention relates to a method for producing a screw (10), having the following steps: a. rolling a screw wire made of low-alloy carbon steel to produce a screw (10) having a thread, b. heating the entire screw (10) to an austenitizing temperature under a carbon atmosphere and/or nitrogen atmosphere and maintaining the temperature, c. quenching the entire screw (10) to a bainitizing temperature and maintaining the bainitizing temperature until the screw has a bainitic structure over its cross section. The invention is characterized in that the screw (10) is subsequently hardened locally at its tip (22), by the tip (22) being heated to an austenitizing temperature and the screw (10) being subsequently quenched to a temperature below the martensite starting temperature (Ms).
IPC 8 full level
C21D 1/06 (2006.01); C21D 1/20 (2006.01); C21D 1/25 (2006.01); C21D 1/76 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C23C 8/22 (2006.01); C23C 8/26 (2006.01); F16B 25/00 (2006.01); F16B 35/00 (2006.01)
CPC (source: EP KR US)
B21H 3/02 (2013.01 - KR); C21D 1/06 (2013.01 - EP KR); C21D 1/20 (2013.01 - EP KR US); C21D 1/25 (2013.01 - EP KR); C21D 1/76 (2013.01 - EP KR); C21D 1/785 (2013.01 - US); C21D 9/0093 (2013.01 - EP KR US); C22C 38/00 (2013.01 - EP); C23C 8/22 (2013.01 - EP KR); C23C 8/80 (2013.01 - EP KR); F16B 25/0021 (2013.01 - EP); F16B 33/06 (2013.01 - EP); C21D 2211/001 (2013.01 - US); C21D 2211/002 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US)
Citation (search report)
See references of WO 2021185853A1
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
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DE 102020107194 A1 20210916; BR 112022018258 A2 20221025; CA 3172948 A1 20210923; CN 115605619 A 20230113; EP 4121571 A1 20230125; JP 2023529250 A 20230710; KR 20220151653 A 20221115; MX 2022010914 A 20230118; TW 202136655 A 20211001; TW I816092 B 20230921; US 2023136145 A1 20230504; WO 2021185853 A1 20210923
DOCDB simple family (application)
DE 102020107194 A 20200316; BR 112022018258 A 20210316; CA 3172948 A 20210316; CN 202180021299 A 20210316; EP 2021056712 W 20210316; EP 21716269 A 20210316; JP 2022554596 A 20210316; KR 20227034447 A 20210316; MX 2022010914 A 20210316; TW 110108182 A 20210308; US 202117910917 A 20210316