首饰铸造石膏浆料工作性能的探讨

Discussion About Working Performance of Gypsum Slurry for Jewelry Casting

首饰石膏型精密铸造中,浇注时间、流动性及凝结时间是衡量石膏浆料工作性能的重要指标。本文选择珠宝首饰企业广泛应用的某品牌铸粉作为试验材料,对比试验了铸粉浆料在不同水类、工艺参数、操作方法下的工作性能。试验结果表明,水类、水粉比、体系温度、铸粉储存状况、搅拌方式、真空脱泡操作都会影响浆料的浇注时间、流动性及凝结时间。首饰生产中应优先采用纯水来混制浆料,并保持各工艺参数与操作方法的合理性与稳定性。

In jewelry gypsum mold casting, pouring time, fluidity and setting time are the important creteria to evaluate the working performance of the gypsum slurry. In this paper, a certain brand investment powder applied widely in jewelry enterprises was chosen as the experimental material, and the tests were carried out to compare the working performances of several kinds of gypsum slurry prepared by the use of different water types, technological parameters and operating methods. The results show that the pouring time, fluidity and setting time of the gypsum slurry are affected by water type, water to powder ratio, system temperature, powder storage state, stirring method, vaccum degassing, etc. In the jewelry production, purified water should be preferentially used to mix gypsum slurry, and the technological parameters and operating methods should be kept reasonable and stable.