EP 2065107 B1 20110907 - Method for producing a component with a hardened surface
Title (en)
Method for producing a component with a hardened surface
Title (de)
Verfahren zum Herstellen eines Bauteils mit gehärteter Oberfläche
Title (fr)
Procédé de fabrication d'un composant doté d'une surface durcie
Publication
Application
Priority
- DE 102007055345 A 20071119
- DE 102007059229 A 20071207
Abstract (en)
[origin: EP2065107A1] The method for the production of functional elements such as clock housing and housing cover, housing base, a latchkey or a crown, with hardened surface for wrist watch, comprises producing a blank of the functional elements as sintered body by sintering under use of stainless steel as sintered material and carrying out a carbon diffusion for arriving carbon atom to form a diffusion zone or diffusion layer on the surface of the blank, in the presence of carbonates in a salt bath at below 300[deg] C. The blank is treated for the carbon diffusion in a protective gas atmosphere. The method for the production of functional elements such as clock housing, and housing cover, housing base, a latchkey or a crown, with hardened surface for wrist watch, comprises producing a blank of the functional elements as sintered body by sintering under use of stainless steel as sintered material and carrying out a carbon diffusion for arriving carbon atom to form a diffusion zone or diffusion layer on the surface of the blank, in the presence of carbonates in a salt bath at below 300[deg] C. The blank is treated for the carbon diffusion in a protective gas atmosphere at a temperature over room temperature and is impregnated after the carbon diffusion, with a hardening plastic material closing the pores of the blank. The blank is manufactured with a density of 6.8-7.25 kg/dm 3>and with a pore size of 0.1-0.5 mu m. The carbon diffusion is carried out over a period of 5-6 days in a carbon containing protective gas atmosphere. The surface of the blank is chemically and/or mechanically processed for exposing the pores before the carbon diffusion. A hard material or hard metal coating is subjected on the functional elements for increasing the wear resistance.
IPC 8 full level
B22F 3/10 (2006.01); B22F 3/11 (2006.01); B22F 5/10 (2006.01); B22F 7/00 (2006.01); C22C 38/00 (2006.01); C23C 8/22 (2006.01); C23C 8/46 (2006.01); G04B 37/22 (2006.01)
CPC (source: EP)
B22F 3/24 (2013.01); C22C 1/08 (2013.01); C23C 8/46 (2013.01); G04B 37/223 (2013.01); B22F 2003/241 (2013.01); B22F 2003/242 (2013.01); B22F 2003/247 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2065107 A1 20090603; EP 2065107 B1 20110907; AT E523274 T1 20110915; DE 102007059229 A1 20090520
DOCDB simple family (application)
EP 08017161 A 20080930; AT 08017161 T 20080930; DE 102007059229 A 20071207