| 摘要 |
The tool has working (B), shaft (S), insertion (E), and impact zones. The core area of the shaft zone and/or the core area of the insertion zone is softer than the edge area of the zones. The hardness of the core areas is a maximum of 35 HRc, and the hardness of the edge areas is at least 50 HRc. The hardness of the working zone and/or the impact zone is at least 50 HRc. The working zone consists of a material different from that of the other zones, and is friction welded to the shaft zone. |
