对变螺距螺纹的成形原理进行了分析。
A theoretical analysis of the varying pitch screw in mathematics, physics and shaping principle was presented.
文章基于3.5轴数控铣床，利用螺旋线展开的平面曲线编程，分层切削，加工出变螺距螺纹；
Programming by the plane curve unwrapped from the helix curve and cutting layer by layer, we created the variable pitch screw on the 3.5 axis NC milling.
用附加有该变螺距螺纹加工装置的普通车床，可以十分方便地加工出符合质量技术要求的变螺距螺纹螺杆。
The reformed lathe can machine the varying pitch screw bolt according to the require of quality and technology.
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