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外螺丝銑切时组銑刀齒形的计算外螺丝銑切时(图十一),粗銑刀工作的分析与内螺丝切削时所说明的分析非常类似,所不同的僅在于若干细节上面。作銑刀工作的分析时,与内螺丝銑切时的情形一样,我们亦以螺纹表面与銑刀齒形所形成的旋转體的相切条件为出发点。在这种情形之下,在垂直於螺丝轴的螺丝剖面下产生了二枝阿基米德螺线,其极点站位于螺丝轴上。选定极座標系统,极点位於螺丝轴上,极轴通过螺丝齒形的理论内半径r,在此座标上可以求出螺丝的向量半径与极角之间的关系,此关系可以用
External thread milling cutter tooth shape calculation External screw milling (Fig. 11), roughing cutter work analysis and internal screw cutting described in the analysis is very similar, the only difference is the number of details above. For milling work analysis, as with the case of internal thread milling, we also take the tangent condition of the rotating body formed by the thread surface and the milling cutter tooth profile as the starting point. In this case, two Archimedes spirals were created under the cross-section of the screw perpendicular to the screw axis, with the pole station on the screw shaft. The polar coordinate system is selected and the pole is located on the screw axis. The polar axis passes through the theoretical inner radius r of the screw tooth profile, on which the relationship between the vector radius of the screw and the polar angle can be found