EP 0340340 B1 19930721 - METHOD FOR THE PRODUCTION OF A DIAMOND-CORE BIT
Title (en)
METHOD FOR THE PRODUCTION OF A DIAMOND-CORE BIT
Publication
Application
Priority
DE 8805449 U 19880425
Abstract (en)
[origin: EP0340340A1] The invention relates to a method for the production and/or the re-tipping of a diamond-core bit in a tubular form, the end face 3 of which has a greater wall thickness than the rest of the tubular wall in order to carry cutting segments 2 on the annular end face 3, the greater wall thickness in the tubular end area 3, 4 being obtained by upsetting, in particular in a rolling process. <IMAGE>
IPC 1-7
IPC 8 full level
B21H 7/00 (2006.01); B21K 5/02 (2006.01); B23D 65/00 (2006.01); B23P 15/28 (2006.01); B28D 1/04 (2006.01); E21B 10/48 (2006.01)
CPC (source: EP)
B23D 65/00 (2013.01); B28D 1/041 (2013.01); E21B 10/48 (2013.01)
Citation (examination)
- JP S58163542 A 19830928 - SUMITOMO METAL IND
- JP S57127535 A 19820807 - KOBE STEEL LTD
- US 3981371 A 19760921 - WALLIS JAMIE MALCOLM
- US 3802520 A 19740409 - WHITMAN L
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0340340 A1 19891108; EP 0340340 B1 19930721; AT E91749 T1 19930815; DE 3882520 D1 19930826; DE 8805449 U1 19880609
DOCDB simple family (application)
EP 88119262 A 19881119; AT 88119262 T 19881119; DE 3882520 T 19881119; DE 8805449 U 19880425