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用无槽丝锥挤压螺纹时,由于被加工金属的收缩,使得螺纹中径有所缩小。因而无槽丝锥和被挤螺纹公差带的相互位置应能补偿螺孔外径和中径的收缩。这是在设计和制造按敞开轮廓和封闭轮廓工作的无槽丝锥时必须考虑到的。无槽丝锥在按敞开轮廓加工方式挤压螺纹时,螺孔内径公差带数值及其分布完全由螺纹底孔的直径公差带数值及其分布所决定,而不取决于丝锥的内径。因为丝锥的内径小于公称
With slotless tap extrusion thread, due to shrinkage of processed metal, making the thread diameter has been reduced. As a result, the mutual position of the slotless tapped and tapped tolerance band should be able to compensate for the shrinkage of the outside and inside diameter of the screw. This must be taken into account when designing and manufacturing slotless taps that work in open and closed profiles. Slotless tap In the open contour machining of the extrusion thread, the screw bore diameter tolerance value and its distribution is completely determined by the diameter of the bottom hole and the diameter of the tolerance value of the distribution of the decision, and does not depend on the inner diameter of the tap. Because the tap diameter less than nominal