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应用ProCAST软件对Fe-Cr-Ni合金轴套的熔模铸造过程进行了数值模拟与分析,主要包括充型过程,凝固时间、缩孔、缩松的形成过程和应力场。模拟结果预测了轴套中存在的热裂缺陷,与实际生产情况基本符合。分析结果表明,轴套铸件产生热裂纹的主要原因是在凝固过程中冒口圈与铸件之间产生了缩松、缩孔,该缺陷的产生使得此部位的强度降低,合金收缩时该部位的拉应力大于其强度极限,因此容易产生裂纹。采取扩大横浇道截面的方法,使得铸件有足够的补缩量,通过生产得到了合格的铸件。
ProCAST software was used to simulate and analyze the investment casting process of Fe-Cr-Ni alloy sleeve, including filling process, solidification time, shrinkage cavity, shrinkage and stress field. The simulation results predict the existence of thermal cracking in the sleeve defects, and the actual production of basic compliance. The analysis results show that the main reason of the hot crack in the sleeve casting is that shrinkage and shrinkage occur between the riser ring and the casting during the solidification process, and the strength of this part is reduced due to the defect. When the alloy shrinks, Tensile stress is greater than its ultimate strength, so easy to crack. Take to expand the cross-runner cross-section of the method, making the castings have sufficient amount of make-up, through the production of qualified castings.