E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/56 (2006.01) E21B 10/58 (2006.01) E21C 35/183 (2006.01)
Patent
CA 2603422
A cutting pick comprising a cutting tip (10) formed such as from SiC-D and a metal pick body (11). The pick body (11) has a greater coefficient of thermal expansion than the cutting tip (10). The pick body (11) includes a generally cylindrical cavity (14) within which is received a generally cylindrical anchor portion (13). The tip (10) includes a coating (17) bonded to the outer surface of the anchor portion (13). An annulus (24) is left between the coating (17) and the cavity (14) within which is a solder or braze material which bonds to each of the coating (17) and the cavity (14). The pick body (11) employs the difference in thermal expansion to exert pressure on the anchor portion (13) to fix the tip (10) to the pick body (11).
Pic coupant composé d'une pointe coupante (10) en SiC-D et d'un corps métallique (11). Ce corps (11) possède un coefficient d'expansion thermique supérieur à celui de la pointe coupante (10). Le corps (11) comporte une cavité cylindrique (14) dans laquelle loge une partie d'ancrage généralement cylindrique (13). La pointe (10) comprend un revêtement (17) lié à la surface extérieure de la partie d'ancrage (13). Un anneau (24) est laissé entre le revêtement (17) et la cavité (14) dans laquelle se trouve un matériau de soudure ou de brasage adhérant au revêtement (17) et à la cavité (14). Le corps (11) utilise la différence d'expansion thermique afin d'exercer une pression sur la partie d'ancrage (13), de manière à fixer la pointe (10) au corps (11).
Weaver Steven
Gowling Lafleur Henderson Llp
Sandvik Intellectual Property Ab
LandOfFree
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