A rotary blade and mounting it for tillage tilling machine

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PROBLEM TO BE SOLVED : securely ground plant while cutting a moderate size capable of mine, hard, tough, cutting force to provide a rotary blade of a tractor. SOLUTION : a rotary shaft rotated by the power of the tractor in the axial direction with respect to a tiller rotary blade 100 installed in plurality, and the soft iron part 110 to the base edge surface side becomes the high hardness of the steel part 120 and the double structure 2 is mounted, a notch 131 forming a plurality of saw-cutting edge 130. The side portion of the soft iron part 120 of steel part 120 ranging from notch 131 is put on, the cutting edge 130 of the steel part 120 of the tip portion, the root portion and the soft iron part 110, and rigid as the blade, when it collides with a stone or the like in the earth to absorb the shock of impact-resistant and refractory brick. The cutting edge 130 provided in the straight part 101, which is curved toward the inside in the one raised portion 102 is about 0-2 are not provided. Selected drawing : fig. 1