| 摘要 |
The present invention relates to rock drill bit for rotary crushing machining of rock. The rock drill bit comprises legs (10), each of which carrying a journal (11) provided with bearing surfaces (27, 28, 34) cooperating with bearing races via bearing elements 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 said 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 method of manufacturing a rock drill bit.
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