EP 2531850 A1 20121212 - NON-DESTRUCTIVE METHOD FOR DETECTING MACHINING BURNS OF A VERY-HIGH-STRENGTH STEEL, AND COLOUR CHART FOR CALIBRATING MACHINING BURNS OF SAID STEEL
Title (en)
NON-DESTRUCTIVE METHOD FOR DETECTING MACHINING BURNS OF A VERY-HIGH-STRENGTH STEEL, AND COLOUR CHART FOR CALIBRATING MACHINING BURNS OF SAID STEEL
Title (de)
ZERSTÖRUNGSFREIES VERFAHREN FÜR DEN NACHWEIS VON BEARBEITUNGSBRANDSTELLEN VON EXTREM HOCHFESTEM STAHL UND FARBTABELLE ZUR KALIBRIERUNG VON BEARBEITUNGSBRANDSTELLEN BEI DIESEM STAHL
Title (fr)
PROCEDE DE DETECTION NON DESTRUCTIF DE BRULURES D'USINAGE D'UN ACIER A TRES HAUTE RESISTANCE, ET NUANCIER D'ÉTALONNAGE DE BRULURES D'USINAGE DE CET ACIER
Publication
Application
Priority
- FR 1050670 A 20100201
- FR 2011050180 W 20110128
Abstract (en)
[origin: WO2011092438A1] The invention relates to a method for efficient, industrialisable detection of machining burns of VHS steel. For said purpose, the machined steel is immersed in an aqueous solution of acids including hydrofluoric acid and nitric acid. In order to define a burn degree, a colour chart for calibrating machining burns of VHS steel detected using the above method is prepared. Said colour chart can consist of studs (P1 to P10) of the examined steel subjected to deliberate damage by excessive resurfacing actions (or other machining modes), then submerged in the acid solution defined above. The resurfacing actions can be simulated by overheated thermal treatment, between the ageing temperature Tv (for example 510ºC for steel) and the solution annealing temperature Ts (950ºC for said steel). The samples are classified according to the grey level thereof resulting from the immersion and corresponding to a predetermined hardness and thus to a predetermined level of damage.
IPC 8 full level
G01N 31/22 (2006.01); G01N 33/20 (2006.01)
CPC (source: EP US)
G01N 33/2045 (2018.12 - EP US)
Citation (search report)
See references of WO 2011092438A1
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)
WO 2011092438 A1 20110804; BR 112012018009 A2 20170620; CA 2786421 A1 20110804; CN 102822668 A 20121212; EP 2531850 A1 20121212; FR 2955937 A1 20110805; FR 2955937 B1 20130208; RU 2012137211 A 20140310; US 2012288946 A1 20121115
DOCDB simple family (application)
FR 2011050180 W 20110128; BR 112012018009 A 20110128; CA 2786421 A 20110128; CN 201180006601 A 20110128; EP 11706887 A 20110128; FR 1050670 A 20100201; RU 2012137211 A 20110128; US 201113574689 A 20110128