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螺纹挤压成形在我国是一个新颖的工艺形式,它具有颇多的优点,其加工效果是切削形式无法与之论比的。当是公制螺纹时,由于其螺纹截形呈三角形,大都为单线,螺旋升角较小,挤压成形的效果极好。当螺纹截形为梯形和矩形时,由于牙型型面较深,扭矩大,且大都为多线螺纹,其螺旋升角又较大,如果按照公制螺纹的形式设计丝锥和挤压很难达到预期效果,而且弊病很大,极易崩齿,甚至无法进行。为使挤压成型用于梯形和矩形螺纹,
Thread extrusion in our country is a novel form of technology, it has a lot of advantages, the processing effect is the cutting form can not be compared with the theory. When it is metric thread, because of its thread truncated triangle, mostly single wire, screw angle smaller, extrusion effect is excellent. When the thread truncation is trapezoidal and rectangular, because the tooth profile is deep, the torque is large, and most of them are multi-thread, the helix angle is larger. It is difficult to design the tap in the form of metric thread and squeeze Expected results, but also great drawbacks, easily collapse teeth, or even impossible. For extrusion molding for trapezoidal and rectangular threads,