摘要
针对制造高质量叶片锻件的材料热变形问题,采用热模拟试验及数据回归拟合的方法建立了某43"汽轮机叶片材料的高温流变应力方程.采用所建立的方程,使用软件DEFORM3D对叶片锻造过程进行了数值模拟和正交试验分析.应力方程计算结果表明,所用材料在高温压缩下的流变应力符合双曲正弦函数关系.试验分析结果表明,凸台直径对叶片锻造质量的影响最为显著,叶根过渡处圆角与摆料位置的影响其次,叶冠过渡处圆角的影响最小,据此对锻造工艺参数进行了优化.生产实践表明:采用优化后的参数可降低载荷,使尺寸公差保持在3mm之内,从而提高了产品质量,减小了材料成本,降低了锻造次数,提高了材料利用率和生产效率,这对叶片材料及模锻件的国产化具有重要意义.
In order to solve the problem of thermal deformation in high-quality blade forging, a high temperature constitutive equation for a 43＂ turbine blade material was established by thermal simulation experiments and data regression. Using the established equation, the forging process was analyzed by orthogonal test and numerical simulation software DEFOEM-3D. The calculation results show that the elevated temperature flow stress of the material accords with hyperbolic sine function. The analysis results show that the effects of the boss diameter, the fillet near blade root, the distance between the center line of blank and mold, and the fillet near blade shroud on the forging quality is successively from large to small. The practical production shows that the forging process using the optimized parameters can not only lower the load, hold the tolerance within 3 mm, and reduce forging times, but also save material and increase the economic efficien- cy of the enterprise. This study may benefit the nationalization of the blade materials and die forgings.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2011年第1期94-98,126,共6页
Journal of Xi'an Jiaotong University
关键词
叶片材料
锻造
流变应力方程
参数优化
blade material
forging
constitutive equation
parameter optimization
