水平分型无箱造型由于仅用一对砂箱,所以有很高的经济性和灵活性,早就应用于小铸件的生产中。但由于采用低比压、高水分的型砂,砂型强度低,不仅机械搬运有困难,而且在浇注时砂型不能承受金属液的压力,需要加套箱。这使其向机械化、自动化发展以及向制造较大的砂型发展发生困难。在这种情况下,有一段时间有被高压有箱造型及垂直分型无箱 Horizontal type No box shape Because only a pair of sand box, so a high degree of economy and flexibility, has long been used in the production of small castings. However, due to the low pressure, high moisture sand, sand low strength, not only mechanical handling difficulties, but also when casting sand can not afford the pressure of liquid metal, the need to add me. This has made it difficult for mechanization, automation and the development of larger sand molds. In this case, there is a period of time there are high-pressure box modeling and vertical classification without box