宝珠砂在发动机铸件生产中的应用

Application of Ceramic Sand in Engine Casting Production

宝珠砂是我国开发的一种粒形近圆、耐火度高、化学性质稳定、抗破碎性强的铸造人工砂。新世纪以来,宝珠砂以其优异的性能,在砂型铸造(潮模砂、水玻璃砂,树脂自硬砂、热芯盒、冷芯盒)及消失模铸造等各种铸造工艺以及铸铁、铸钢、有色合金等多种铸造合金中得到了广泛的应用,取得了节约粘结剂用量、减少铸件缺陷、提高铸件质量、降低废弃物排放等显著效果。宝珠砂目前为止最大的应用场合是发动机铸造行业。本文介绍了一些宝珠砂在发动机铸件,包括气缸体、气缸盖、排气歧管以及涡轮增压器壳体中的应用实例,分享了部分工艺参数、应用要点和效果效益。

Ceramic sand,originally developed in China,is a kind of artificial foundry sand with superior properties such as spherical grain shape,high refractory,chemical inertness and good crushing resistance.Since the beginning of 21st century,ceramic sand,in virtue of its exceptional characteristics in foundry use,has been successfully employed in many factories of sand casting(green sand,sodium-silicate bonded sand,no-bake,hot-box,and cold-box,for sand moulding and core-making)and EPC process to produce iron,steel and Non-Ferrous castings.Foundries have gained enormous benefits of binder consumption savings,casting defects reduction,wastes emissions elimination,and quality promotion.By statistics,the largest market of ceramic sand is the engine casting industry.This article introduces several application samples of ceramic sand in production of engine casting parts,such as cylinder blocks,cylinder heads,and exhausting manifolds,as well as turbocharger housings.Some application parameters,for example,ceramic sand grain size distribution,binder adding rate,core sand properties and sand cycling process guidelines are described.Castings components production achievements and sand using principles are also provided.