By decreasing the grade of cast iron,using furan resin selfsetting sand as a substitute for clay sand to make the core and prolonging cooling time in mould,the cracking problem has been solved.

• 通过降低材料牌号,使用呋喃树脂自硬砂取代粘土制芯,延长铸件在型内冷却时间,使裂纹缺陷问题得到解决。