在数控车床中运用子程序指令编程分层切削梯形螺纹，有效地解决了梯形螺纹加工过程中易扎刀的问题，在教学中实施此法，学生可以安全、高效、高精度完成梯形螺纹的加工。%Application of subroutine in layered cutting of metric trapezoidal screw threads addresses effectively the breaking edge. In teaching, students can be safe, effective and high-precision in machining of trapezoidal thread.
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