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由高合金铸钢制成的厚壁铸件,由于其壁厚差异较大,热节集中,铸造过程中易在热节处产生缩孔缩松。本研究通过对铸件材料和结构分析,同时对某工厂现有工艺进行模拟,分析产生缺陷的原因,然后提出改进措施,优化了铸造工艺。结果表明,在该厚壁件轴承孔内添加大小为Φ76 mm×23.5 mm的冒口、采用顶注式浇注时,可实现铸件的顺序凝固,将缩孔缩松集中在冒口内,获得了优良铸件,并降低了铸造成本。
Thick-walled castings made of high-alloy cast steel, due to their large differences in wall thickness, focus on the hot section, easy to produce shrinkage shrinkage at the hot section during the casting process. In the present study, through analyzing the material and structure of castings, we simulate the existing technology in a certain factory at the same time, analyze the causes of the defects, and then propose the improvement measures to optimize the casting process. The results show that, in the thick-walled bearing hole to add the size of Φ76 mm × 23.5 mm riser, the use of top-pouring casting, the order can be solidified castings, shrinkage shrinkage concentrated in the riser, obtained fine Castings, and reduce casting costs.