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用丝锥在难加工材料上攻通孔螺纹,特别是盲孔螺纹时,由于其韧性较高,因而会产生很多困难,而且,不同材料须采用不同结构和刃磨几何形状的丝锥,这不仅给丝锥的选择带来麻烦,而且增加了丝锥的品种规格和制造难度。本文推荐的丝锥可用在各种不锈钢、耐热钢、高锰钢和合金上加工出H7级精度M4～M36的基本螺纹。该丝锥的主要特点是:从第二锥开始减小中径的铲磨量,以改善头锥攻丝后的二锥拧入时的定心条件;增加切削锥的长度,以减小切削力和中心孔尺寸,从而改善采用成组丝锥和安全卡头在机床上攻丝时的定心条件;最后一锥的螺纹牙形不铲磨。
Taps threading difficult-to-machine materials, especially blind-hole threads, have many difficulties due to their higher toughness, and different materials require taps of different configurations and sharpening geometries, not only for Tap the choice of trouble, but also increased the variety of taps and manufacturing difficulty. Taps recommended in this article can be used in a variety of stainless steel, heat-resistant steel, high manganese steel and alloy processing H7 level accuracy M4 ~ M36 basic thread. The main features of the tap are: to reduce the diameter of the scoop from the second cone, so as to improve the centering condition of the two cones after tapping the taper; to increase the length of the taper to reduce the cutting force And the center hole size, thereby improving centering conditions when tapping on a machine tool using a set of taps and safety clips; the last conical thread profile is not shovel-milled.