金属型腔模具粉浆浇注成型工艺的实验研究

Experimental Study on Slurry-casting Molding Process of Metal-cavity Mould

以热固性环氧树脂为粘结剂,分别使用平均粒径为44mm的较粗铁粉、平均粒径为4mm较细的羰基铁粉,以及两者按照一定比例组成的双形态混合铁粉为基体材料,分别在空气和真空下混浆、注浆,探讨了铁粉粉浆浇注成型工艺中的若干问题。实验表明:采用真空下混浆、注浆,可以消除气泡,提高浆体的流动性和密实性;另外,铁粉粒度的大小也直接影响着浆体的流动性。实验中同时发现使用较细的羰基铁粉与相对较粗的铁粉按照合理比例组成的双形态混合粉末,具有更好的流动性和充填性,而且从密度特征看,试样更具密实性。

Taken epoxy resin as cohesive material,problems in iron powder slurry-casting processare discussed by using the coarse iron powder with 44mm,4mm of average grain diameter and themixture of them in certain proportion as the matrix to mix and cast slurry in air and vacuum separately.It turns out mixing and casting slurry in vacuum may eliminate air bubbles and improve fluidity andintensity of slurry.In addition,the size of iron grain influences the fluidity of slurry directly.Theexperiment also proves the mixture of fine carbonyl iron grains and coarse iron grains has betterfluidity and filling ability.And the samples are more intensive in the view of the feature of density.