铸造中覆膜砂制芯工艺的应用

在造型、制芯前砂粒表面上已覆盖有一层固态树脂膜的型砂、芯砂称为覆膜砂,也称壳型(芯)砂。现已发展成用热塑性酚醛树脂加潜伏性固化剂(如乌洛托品)与润滑剂(如硬脂酸钙)通过一定的覆膜工艺配制成覆膜砂,受热时在乌洛托品分解作用下,熔融的树脂由线性结构迅速转变成不熔融的体型结构,从而固化成形。覆膜砂具有良好的流动性和存放性,用它制作的砂芯强度高、尺寸精度高,便于长期存放。用覆膜砂既可制作铸型,又可制作砂芯(实体芯和壳芯),覆膜砂的型或芯既可以相互配合使用,又可以与其他砂型(芯)配合使用;覆膜砂不仅可以用于砂型铸造、金属型重力铸造或低压铸造,也可以用于铁型覆砂铸造,还可用于热法离心铸造;不仅可以用于生产钢铁金属铸件,还可以用于生产非铁合金铸件。

In Casting Membrana Tectoria Granulated Substance System Core Craft Application

Before the modelling,the system core on the sand grain surface has covered has solid state resin membrane molding sand,the core granulated substance to be called the membrana tectoria granulated substance,also calls shell(core)the granulated substance.Already developed adds the latent firming agent with the thermosplastic phenolics(for example methenamine)with the lubrican(tfor example stearic acid the calcium)compounds the membrana tectoria granulated substance through certain membrana tectoria craft,when ...