异型薄壁罐气压胀形数值模拟研究

【作者】 张安阳；

【导师】 金杰；

【作者基本信息】 浙江工业大学 ， 机械制造及其自动化， 2006， 硕士

【摘要】 异型罐气压胀形是一种先进的加工技术，由于容易满足异型罐产品降低成本、减少工序、减轻重量和无残留胀形介质腐蚀等优点，异型罐气压胀形加工在近年来得到大力的发展和应用。本文详细介绍了胀形的机理及力学特点，深入阐述了板料数值模拟技术，总结出了适合异型罐气压胀形数值模拟技术的关键参数。采用板料成形仿真软件对异型罐的胀压成形过程做数值模拟，目的是为生产工艺参数设定和模具设计提供理论上的指导。本文主要在以下几个方面做了研究：1．通过理论公式计算和数值模拟相结合的方法，近似求取A、B两种罐型在T2BA、T2.5BA、T3和T4CA等四种材料情况下的胀压成形临界力，为生产选用经济适用的超高压设备提供理论依据；2．讨论罐体壁厚不同对胀压成形极限的影响；3．通过对五种与B型罐类似的异型罐做模拟，分析胀形系数不同对成形的影响；4．通过对三种与A型罐类似的异型罐做模拟分析，探讨了摩擦系数的变化对壁厚分布的影响；5．分析胀形载荷变化与胀形载荷加载速率变化对成形过程中褶皱的消除和壁厚分布的影响；6．对类B型罐T3材料的两种罐型，通过改变其上下凸肚连接处的过渡圆角半径的大小做模拟分析，总结模具的过渡圆角半径变化对壁厚分布的影响。更多还原

【Abstract】 Bulging shaped can by pneumatic pressure is a kind of advanced process technology, apt to lower costs, simply process , lighten weight, and without residue corrode. It has get a flying development and application in recent years . Mechanism and mechanics in this paper has been detailed. Through elaborating the sheet metal forming numerical simulation technology, the key parameter that suit technology of numerical simulation of shaped can bulging by pneumatic pressure is been summarized. And turn the engineering stress-strain curve of the parameters into the true stress-strain curve. Sheet metal forming software is adopted to simulate the processing of shaped can bulging by pneumatic pressure, and the purpose is to offer the guidance for the production processing and mold designing in theory.The main contents of this paper include following parts:1. Gets the critical loads of A ,B style can made of T2BA、T2.5BA、T3 and T4CA by theoretical computing and numerical simulation, which offer theoretical foundation for selecting the economical superpressure equipment ;2. The effect of shaped can wall thickness changing on limit of bulge forming is discussed; 3. The effect of bulge coefficient on forming of five kinds of shaped can which similar to Model B have been analyzed by simulation;4. Through making simulation analysis of three kinds of shaped can similar to Model A can, we have studied the thickness distributed of the wall according to the coefficient of friction changing;5. It is analysed that the forming load change and the forming load velocity change which influence elimination of the fold and thickness of the wall in course of taking shape;6. Summarized the effect of the changing radius of transition round of the two protruding junction on the thickness distributed of the wall, by simulation of two kinds of shaped can (materials: T3) which similar to Model B.更多还原