用滚切法加工任意尺寸和任意截面的多头内,外螺纹(在通孔和育孔中),可确保被加工面获得较好的质量并提高生产率。在滚齿机上按照角α=α_g-α_φ角装置滚刀(参阅插图)。这里,α_g 是工件的螺纹升角,α_φ是滚刀的螺纹升角。当工件和滚刀最终同时转动时,走刀运动沿着被切螺纹轴进行。工件的转速 n_g=nφ24[1-s_1/(PZ_g)]/Zg, The use of hobbing to process multiple internal and external threads (in through holes and holes) of any size and at any cross section ensures a good quality of machined surface and increased productivity. Set the hob at the angle α = α_g-α_φ on the hobbing machine (see illustration). Here, α_g is the thread lead angle of the workpiece, and α_φ is the thread lead angle of the hob. When the workpiece and hob eventually turn at the same time, the cutting motion is along the cut thread axis. The rotational speed of the workpiece n_g = nφ24 [1-s_1 / (PZ_g)] / Zg,