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苏联第湼伯彼得洛夫斯基工厂,在加工CT3钢料的φ11A3零件时,设计了一种双头螺旋齿铰刀(如附图),使用这种铰刀能提高被加工孔的表面光洁度,一般可达到7级。铰刀上有左螺旋槽,切削部分的锥角等于1°03′,刀齿刃磨后有0～5°的前角,棱边上的后角等于0°。大倾角的螺旋齿铰刀,不仅能保证表面光洁度的要求,同时可以减轻切削力。铰刀由y12A或9×C钢制造;热处理后硬度达Rc61～65。制造的特
The Soviet Niebpi Petrovsky factory, in the processing CT3 steel φ11A3 parts, the design of a double-headed spiral reamer (pictured), the use of such reamers can be machined hole surface finish , Generally up to 7 levels. The reamer has a left spiral groove, the taper angle of the cutting part is equal to 1 ° 03 ’, the rake angle of 0-5 ° after the blade is sharpened, and the relief angle on the edge is equal to 0 °. Steep helical reamer, not only to ensure the surface finish requirements, while reducing the cutting force. Reamer by y12A or 9 × C steel manufacturing; hardness Rc61 ~ 65 after heat treatment. Made special