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苏联查波罗什变压器生产联合公司对麻花钻的切削部分几何形状进行了改进,这种钻头具有曲线(圓弧的)的主切削刃1。刃蘑半径R=1.05d,式中d为钻头直径(图α)。切削刃的圆弧形状可借助钻头刃磨夹具(苏联发明证书号867613)加工而成。现在研制的麻花钻切削部分的新型曲线几
The Soviet Union Chaparros Transformer Production Associates has improved the cutting geometry of a twist drill, which has a curvilinear (circular arc) main cutting edge. Blade radius R = 1.05d, where d is the drill diameter (Figure α). The shape of the cutting edge can be machined with a sharpening bit (Soviet Certificate No. 867613). Now developed a twist drill some of the new curve