锻压技术

锥形凹模缩口应力计算方法的比较

英文标题：Comparison of the calculation methods for the necking stress of the cone-shaped concave die

作者：胡成武罗文波彭炎荣

单位：株洲工学院机械工程学院湘潭大学基础力学与材料工程研究所湘潭大学基础力学与材料工程研究所湖南株洲412008 湖南湘潭411005 湖南湘潭411005

关键词：缩口力厚度变化硬化效应

分类号：TG385.2

出版年,卷(期):页码：2005,30(3):63-65

摘要：

缩口应力是导致薄壁筒形件缩口失稳的重要因素,为了提高缩口应力的计算精度,综合考虑了板厚变化、加工硬化及摩擦等因素的影响,采用斯德洛日夫和翁克索夫的两种求解方法,通过实例计算了圆筒形件的缩口应力以及在不考虑厚度变化及硬化效应条件下的缩口应力,并对3种计算结果进行了比较,前两种方法的计算结果十分接近,但后者相差甚远。由此得出,厚度变化和硬度效应的影响相当显著,不可忽视。

The unstable contraction is the main failure factor when the thin-wall cylindrical parts are shaped. To improve the calculation precision of contracting force, many factors including the thickness change, the hardening effect and the friction should be all considered during the calculating process. In this paper, the contracting force of the thin-wall cylindrical parts is calculated respectively by using СТОРОЖЕВ method and УНКСОВ method considering the thickness change and the hardening effect. Meanwhile, it is calculated also without considering the thickness change and the hardening effect. Comparing with afore-mentioned three calculation results, it is found that the thickness change and the hardening effect have a profound influence on the calculation results of the contracting force.

基金项目：

国家自然科学基金项目(20202012);; 湖南省自然科学基金项目(04JJ6035)资助

参考文献：

[1]胡成武,邹安全,姚齐水.基于轴对称屈曲失稳的缩口力与临界缩口尺寸[J].锻压技术,2003,28(3):1415.
[2]胡成武.基于最小缩口力条件下的缩口凹模倾角[J].锻压技术,2004,29(2):6466.
[3]KobayashiS.Approximatesolutionforperformdesigninshell nosing[J].InternationalJournalofMach.ToolDes.1983(23):111122.
[4](苏)斯德洛日夫,(苏)波波夫,哈尔滨工业大学锻压教研室,吉林工业大学锻压教研室译.金属压力加工原理[M].北京:机械工业出版社,1980.
[5](苏)翁克索夫,王仲仁译.金属塑性变形理论[M].北京:机械工业出版社,1992.

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