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如图所示带有三组切削和熨平刀齿组的丝锥,可加工直径12～24毫米的内螺纹,精度可达1级。该丝锥切削刀齿的铲背量K_1同普通切削丝锥。而熨平刀齿的铲背是从熨平刀齿的中间向两边作双向铲背,铲背量为K_2,一般可根据螺纹的螺距取0.03～0.08毫米。且熨平刀齿的刀齿的平均直径比切削刀齿的稍大,一般大0.01～0.04毫米,即有熨压余量0.005～0.02毫米。在长度为L_1的切削锥部上,切削刀齿是照
Shown in the figure with three groups of cutting and scalping teeth tooth group, the diameter of 12 to 24 millimeters can be processed within the thread, the accuracy of up to 1. The tapping cutter tooth shovel back amount K_1 common cutting tap with. The scalpel cutter shovel back is from the middle of the screed blade to the two sides shovel back, back shovel amount of K_2, generally according to the thread pitch to take 0.03 to 0.08 mm. And the average diameter of the teeth of the scalpel cutter is slightly larger than that of the cutter blade, which is generally 0.01-0.04 mm, that is, the ironing residual is 0.005-0.02 mm. On the cutting cone of length L_1, the cutting teeth are illuminated