锥形凹模板料不起皱条件和极限拉深系数

CONDITIONS OF PLATE WITHOUT CRIMPING AND LIMITE DRAWING COEFFICIENT OF TAPER FEMALE DIES

本文通过分析锥形凹模拉深变形过程，利用试验数据，列出了板料不起皱的条件；并运用主应力法和板料弯曲的外力功等于内力功的原理以及摩擦理论，推导出加工硬化时变形区危险断面最大拉应力计算公式和无压边装置锥形凹模的圆筒件极限拉深系数计算公式；均由实例进行验证。拉深系数为０．３９的两种零件，从试制到生产，证明了锥形凹模是可以实现深拉深的模具。

he article analyses drawing strain process of taper female dies, makes a use of test data for listing the conditions of plate without Crimping, makes a use of main stree method and plate bending principle that outside force work is equated to inside force work as well as friction theory for inferring maximum stree calculation formula in hardening danger section and round tube limite drawing coefficient Calculation formula of taper female dies without pressure plate. Those are examined by examples.Two parts whose drawing coefficient are 0. 39 passed through testing to production. It proved that taper female die is used up in deep drawing.