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阶梯形三刃硬质合金钻头如图所示,其钻刃是成阶梯形状。这种钻头没有横刃,所以能减少钻削时产生的轴向力。由于钻心处是呈倒锥形状,故能
Stepped three-edged carbide drill as shown, the drill edge is a ladder shape. This drill has no chisel edge, so it can reduce the axial force generated during drilling. As the center of the drill was inverted cone shape, it can