论文部分内容阅读
在很长时期内,塔什干掘土机制造厂在铸钢方面遭遇到很大的困难,由于铸件表面粘砂严重和铸件清砂费工,因此很难获得表面光洁的钢铸件(钢号为30—ГЛ)。该厂在生产钢铸件时,应用当地的达尔巴任砂,砂内含有较高的坭量,约为3—5%。由於这种砂子内含有低熔点的杂质,它的耐火性较低;而且又不可能使用涂料以减少粘砂,因为铸件主要是用湿模浇铸的。如果用远地的石英砂,不但要加重铁路运输的负但,并且直接增加了生产成本。该厂为了保证获得表面光洁和不粘砂的铸件,在使用
For a long time, the Tashkent bulldozer factory encountered great difficulties in the field of steel casting. Because of the heavy sticky sand on the surface of the castings and the cost of cleaning the foundry sand, it is difficult to obtain smooth steel castings (steel grade 30 -ГЛ). In the production of steel castings, the plant uses local Darba sand, which contains a high amount of gallon, about 3-5%. Because of the low melting point impurities contained in this sand, it is less fire resistant; and it is not possible to use coatings to reduce sticking sand as the casting is mainly cast in wet form. If the use of quartz sand far away, not only to increase the negative but the railway transport, and direct increase in production costs. In order to ensure the smooth surface of the plant and non-stick sand casting, in use