| 摘要 |
PROBLEM TO BE SOLVED: To constitute a wear-resistant composite cutting edge to have effective excavating performance to a situation where the crack development of a rock bed cannot be expected by changing a viewpoint from conventional cutting edges. SOLUTION: This wear-resistant composite cutting edge 1 for excavating sediment, a rock, or the like has an upper face 2, a bottom face 3 and opposed side faces 4, a cutting edge tip 5 formed at the tip part, and a fitting part 6 mountable to a working machine, on the proximal end side. In this case, hard wear-resistant layers 7 are formed only at the bottom face 3, at both side end parts in a cross direction in a required range. COPYRIGHT: (C)2004,JPO&NCIPI
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