随着现代各种工业发展的需要,不少产品逐步向小型化、精密化发展的趋势愈来愈大。为此对铸件的质量,精化提出了更高要求,普通的砂型铸造常常不能满足,因此需要采用特种铸造工艺。为了获得优质产品,除应达到设计予定的技术性能指标外,还必须有良好的经济性和工艺性,所以,正确选择铸件的铸造工艺,为取得产品设计的良好经济效益有着重 With the needs of the development of various industries in the modern era, more and more products are gradually becoming more compact and sophisticated. To this end the quality of castings, refined put forward higher requirements, the common sand casting often can not meet, so the need for special casting process. In order to obtain high quality products, in addition to meeting the design specifications, it must also have good economy and craftsmanship. Therefore, the correct choice of the casting process of the castings has a strong economic benefit for product design