本文考虑了非对称三角形螺纹的螺距偏差和牙侧角偏差的各种组合对作用中径的共同影响，运用了包容图位移法，分析和推导出非对称螺纹作用中径的精确计算公式。
By the use of the displacing enveloping drawing method, a set of exact formulae for calculating the virtual pitch diameter is deduced and verified by measured data.
在薄壁管体的缩径旋压成形过程中，旋压工艺方法和旋轮的选择对缩旋成形有着重要作用。
During the reduction spinning process of thin thickness tube, the selection of spinning technique is important for spinning figuration.
运用有限元模拟的方法研究了内角半径在等径角挤压过程中的作用。
The effect of inner corner radius on the plastic deformation behavior in equal channel angular pressing was investigated using finite element method.
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