| 摘要 |
There are disclosed two embodiments of a hard metal insert adapted to be installed on the face of a cutting tool, each insert comprising inner and outer bodies having particles of carbide or other highly abrasive material sintered in a binder of cobalt or other less abrasive, but tougher metal, and having wear surfaces of their outer ends configured to form a tip on the outer end of the inner body, and wherein the particle size and/or chemical composition of the bodies are such that the inner body is harder, but less tough, than the outer body.
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