大型机床床身充型凝固及铸造热应力有限元分析-材料工程专业论文.docx

哈尔滨工业大学工程硕士学位论文 哈尔滨工业大学工程硕士学位论文 万方数据 万方数据 Abstract This paper selected the machine bed that was manufactured of the material HT250 as the research object，there have been designed three different casting solutions, then these three scenarios were simulated casting, after that, the distribution of these three programs’ temperature field and stress field were got, then the simulated results of the three options were compared, and the defects generated on each program were analyzed. At last, by comparing the pros and cons of the three programs, the results provide the basis for optimizing the process and reducing defects. This paper carries through three dimension solid modeling to the machine bed based on UG, and discussed the interface mode between the mesh division module of the simulation software ProCAST and three dimension solid modeling software UG, the PARASOLIDS file format was selected as the interface mode to the mesh division module MeshCAST through actual operation, and the mesh file can be well used into subsequent calculations with the software ProCAST. By carrying through the Numerical Simulation Calculation to the temperature field and stress field of the machine bed under three different scenerios with the simulation software ProCAST, after that the simulation results of the three different scenerios were analyzed and contrasted. To make the results more convincing, the curves and graphs have been compared. The final result is: To the temperature field, from both how the temperature field was distributed and the sequential solidification, the result of the Scenerio 3 is the best. To the stress field, the stress field distribution of Scenerio 3 is very well, but some part would present stress concentration. The stress field distribution of Scenerio 2 is worse than Scenerio 3, but there is no obvious stress concentration in Scenerio 2.Thus, to the stress field, both Scenerio 2 and Scenerio 3 have their own advantages and disadvantages. To the distortion