ABSTRACT

In the foundry for the production of moulds and cores, mixtures based on water glass are widely used. During their hardening, the coagulation of liquid glass occurs, as a result of which the mixture obtains high strength characteristic. A significant drawback of moulding mixtures based on water glass is low knockout due to increased sintering ability of water glass with moulding sand. To improve knockout, weak additives are introduced into the composition of moulding mixtures.

This paper analyses the characteristics of organic weak additives for the composition of moulding mixtures based on water glass. It is shown that the main indicators which affecting to the knockout of mixtures are the amount of evolved gases and the forming carbon formation. With an increase in coefficient of thermal destruction, the knockout of the mixtures based on water glass mixture is reduced by increasing the amount of formed carbon.

摘要

在生产模具和型芯的铸造厂中，广泛使用基于水玻璃的混合物。在硬化过程中，液态玻璃发生凝结，因此混合物获得高强度特性。由于水玻璃与型砂的烧结能力增加，基于水玻璃的成型混合物的一个显着缺点是脱模率低。为了改善脱模，在模塑混合物的组合物中加入弱添加剂。

本文分析了用于水玻璃基模塑料组合物的有机弱添加剂的特性。结果表明，影响混合物敲除的主要指标是析出气体的量和形成的碳的形成。随着热破坏系数的增加，基于水玻璃混合物的混合物的敲除通过增加形成的碳的量而减少。