1982年第2期《机械工人》(热加工)曾介绍过《螺旋叶片组合冷拉成型法》一文,该文在计算螺旋叶片坯料内孔直径时,按热成型公式计算,算出尺寸与实际所需尺寸相差太大,不能直接作下料依据,不同螺距螺旋的坯料内径仍由试验决定。因此,如何准确计算叶片坯料内孔直径,是提高螺旋叶片组合冷拉成型法生产效率的关键,现对计算方法分析如下: 一、现有的两种计算方法 1.按热成型计算公式计算 In 1982 the first two “mechanic” (thermal processing) had introduced the “spiral blade combination cold drawing method,” a article in the calculation of helical blade blanks when the hole diameter, according to thermoforming formula to calculate the size and actual To be too big difference in size, can not be directly based on the material under different spiral pitch billet diameter is still determined by the test. Therefore, how to accurately calculate the inner diameter of the blade blanks is the key to improve the production efficiency of the helical blade combination cold drawing method. The calculation methods are as follows: 1. The two existing calculation methods 1. Calculated according to the thermoforming formula