摘要
为了提高产品的质量和工作效率并降低生产成本,需对预制坯进行合理的预成形设计。根据能量最小原理和最小阻力原理,利用塑性变形过程中坯料的流动规律与静电场等势线分布类似这一特性,提出一种能够进行预成形设计的新方法—类等势场法,并采用该方法对粉末高温合金盘件进行预成形设计,从中优选出6组预成形形状,并利用商用有限元软件MSC/SuperForm对上述预制坯的等温成形过程进行数值模拟,得到了6组粉末高温合金盘件终锻结束时各个部分的等效应变分布以及预锻和终锻的变形程度分配。通过对盘件轮毂、辐板和轮缘三部位以及整体盘件最大等效应变和最小等效应变的比较与分析,以及预锻变形量和终锻变形量的比较,并参考模具法向和切向的受载情况,认为选择3号预锻模为最佳方案。结果表明,该方法克服了传统方法精度低、耗时和耗力等缺点,其结果可靠。
In order to improve the product quality and work efficiency and reduce the cost, rational preform design must be carried out for the preformed blank. On the basis of the minimum energy principle and the least resistance principle, and by utilizing the analogy between the flow law of blank in the plastic process and the isopotential line distribution in the electrostatic field, a new method for preform design, i.e. equi-potential field method, is proposed and adopted for the perform design ofp/m superalloy discs. Six groups of preformed shapes are selected by using ANSYS software simulation. At the same time, the isothermal forging of the P/M superalloy disc is simulated by using software MSC/Superform with the obtained die shapes in order to obtain the e quivalent strain distribution in the final shapes and the deformation degree at pre-forming and finish forging. Through comparing the equivalem strain, the deformation degree and other field variables, a rational preforging is recommended.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第5期237-243,共7页
Journal of Mechanical Engineering
基金
航空基础科学基金资助项目(03H53048)
关键词
粉末高温合金
类等势场
预成形设计
有限元模拟
P/M superalloy Equi-potential field Preforming desal Finite element simulation
