大型铸钢件冒口设计及其凝固过程模拟

Design of large steel casting riser and simulation of its solidification process

以挤压机前梁铸造为例,根据挤压机前梁的尺寸和形状,设计出合理的冒口,并利用ProCAST软件对挤压机前梁的凝固过程进行模拟,以检验冒口设计的合理性,同时对设计的冒口进行优化设计。首先对铸件本体进行凝固过程模拟,确定铸件本体热节的数量和位置,进而确定冒口尺寸、数量和位置,然后对铸件初始工艺方案进行凝固过程模拟分析,并通过模拟结果对铸件工艺方案进行优化改进,对优化后的工艺方案进行凝固过程模拟。模拟结果表明优化后的工艺方案合理,冒口能够充分补缩铸件,铸件表面和内部无缺陷,组织致密。

Taking the former beam of a metal extrusion machine as an example, the reasonable risers were designed according to the beam size and shape, the solidification process of the beam was simulated to test the rationality of the risers using ProCAST software, and then the riser design was optimized. After determining the dimension and number of risers based on the solidification results and the number of hot spots, the optimal sand mold riser was obtained. Furthermore, the original sand mold program can be optimized to reduce riser size. The calculation results show that riser design is reasonable in improving the feeding casting and casting surface, and obtaining less-defect and compact internal structure.