硅溶胶模壳工艺试验

Process Investigation of Colloidal Silica Shell Mold

通过调整硅溶胶模壳不同层次的涂料比例,得到合适的制壳工艺参数。结果表明,硅溶胶型壳需要保证一定厚度,以减少薄壁铸件欠铸现象。根据试验结果,推荐型壳厚度为6.5 mm左右;硅溶胶中二氧化硅含量为27%~28%左右时,型壳退让性较好,能减少型壳对铸件收缩的影响;降低硅溶胶中二氧化硅含量能提高型壳溃散性,有利于型壳清理。

By adjusting the coating proportion of different layers of silica sol mold shell, the suitable process parameters of shell making were obtained. The results show that the silica sol shell should be of certain thickness to reduce the phenomenon of under-casting. According to the test results, the recommended shell thickness is about 6.5 mm;When the silica content in silica sol is about 27%.28%, the mold shell has good reducibility and can reduce the influence of mold shell on casting shrinkage. Reducing the content of silica in the silica sol can improve the collapsibility of the shell and facilitate the cleaning of the shell.