| 摘要 |
PCT No. PCT/SE96/00312 Sec. 371 Date Aug. 12, 1997 Sec. 102(e) Date Aug. 12, 1997 PCT Filed Mar. 11, 1996 PCT Pub. No. WO96/28632 PCT Pub. Date Sep. 19, 1996The present invention relates to a rock drill bit for rotary crushing machining of rock. The rock drill bit includes legs (10), each of which carry a journal (11) provided with bearing surfaces (27, 28, 34) cooperating via bearing elements with bearing races in a rotatable roller provided with inserts or chisels. Each leg is made from a parent material with substantially homogeneous hardness and each leg comprises a leg tail (30) provided to resist entrance of drill cuttings into the bearings. The bearing surfaces (27, 28, 34) have higher wear resistance than the parent material and the leg tail (30) is at least partly of the same material condition as the bearing surfaces. The invention further relates to a method of manufacturing a rock drill bit. |
