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针对实际铝合金转向器压铸件,运用JSCAST软件对其充型及凝固过程进行模拟,采用三维X射线断层扫描技术得到了铸件中微观孔洞的形貌特征、尺寸大小及分布规律,并与模拟结果进行了对比验证与分析。结果表明,转向器铸件中主要为小体积的孔洞,其等体积球直径为0.261~0.288mm;气缩孔和缩孔尺寸较大,主要分布在铸件壁厚较大的两个安装孔和形状复杂的齿条与齿轮轴连接处。铸件中间部位由于金属液汇流,产生大量的气孔。
In view of the actual aluminum alloy die casting, the JSCAST software was used to simulate its filling and solidification process. The morphological characteristics, size and distribution of microscopic holes in castings were obtained by three-dimensional X-ray tomography. The results were compared with the simulation results Conducted comparative verification and analysis. The results show that the steering gear castings mainly have small volume of holes with an equal volume of sphere diameter of 0.261-0.288mm, larger shrinkage and shrinkage cavities, which are mainly distributed in two mounting holes and shapes with larger wall thickness Complex rack and pinion shaft connection. The middle part of the casting metal flow convergence, resulting in a large number of pores.