关键词: 铸造成形, 数值模拟, 试验设计, 双三次插值, 响应面法, 敏感性分析

Abstract: Aiming at the commonly used “instantaneous filling and temperature uniformity” of assumption conditions in ingots cast forming process,a simulation and optimization analysis method for influence factors of cast forming process was proposed based on orthogonal experimental design,numerical simulation and response surface methodology.By taking 6-ton ingot of Cr5 steel casting process for example,the sample data were obtained through experimental design and numerical simulation methods,and the primary and secondary order of each factors on response index were obtained with range analysis.A response surface modeling method was presented based on bicubic interpolation algorithm,and the regression response surface model of heat transfer coefficients and preheat temperature and response index was established.A local sensitivity analysis method for parameters was constructed based on response surface function to correct the test results.The results showed that the influence of temperature field change of filling process on solidification process should be considered to ensure the accuracy and reliability for influence factors simulation of the cast forming process,and improve the quality of ingot casting.

Key words: cast forming;numerical simulation, design of experiment, bicubic interpolation, response surface methodology, sensitivity analysis