| 摘要 |
PCT No. PCT/FI94/00253 Sec. 371 Date Dec. 13, 1995 Sec. 102(e) Date Dec. 13, 1995 PCT Filed Jun. 13, 1994 PCT Pub. No. WO94/29564 PCT Pub. Date Dec. 22, 1994A method for mounting hard metal buttons in a drill bit and a drill bit. In the method, a hole (4) is worked into a drill (1) before the drill bit is tempered. Subsequently, a hard metal button (3a) surrounded by brazing material is positioned into the hole (4) of the drill bit (1). The assembly is positioned into a tempering space, in which the brazing material spreads around the hard metal button (3a) into a space between the walls of the hole (4) and the hard metal button (3a) under the influence of heat. When the drill bit (1) is cooled after this, the brazing material (5) solidifies, and simultaneously, the body portion (2) of the drill bit (1) having a higher thermal expansion coefficient presses the hard metal button (3a) through the brazing material (5). |
