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文中介绍英国James Maude公司的铸铁车间经过几年的努力所采取的改善质量措施。该车间每周生产140～150吨的各种复杂外形的铸件,铸件重量多数为220～1120公斤(有时也达2250公斤)。产品为机床、冷冻机、压缩机等另件。车间内所用的自硬砂,其原砂呈半角状颗粒,尺寸大小为45～50单位(按AFS计);用脲醛呋喃树脂粘结剂(含氮7％,另加甲硅烷0.3％),其量1.1～1.2％(外模)及1.4％(砂芯);以磷酸作催化剂,其量为粘结剂量的35～75％(依车间空气湿度而定)。使用木模造型,最近广泛使用多层
This article describes the quality improvement measures taken by James Maude’s cast iron foundry over the years of hard work. The workshop produces 140 to 150 tons of castings of various complex shapes per week, with a casting weight of 220 to 1120 kg (sometimes up to 2250 kg). Products for machine tools, freezers, compressors and other pieces. Used in the workshop of self-hardening sand, the original sand was a half-size particles, the size of 45 to 50 units (by AFS); with urea formaldehyde furan resin binder (nitrogen 7% plus monosilane 0.3%), The amount of 1.1 to 1.2% (outer form) and 1.4% (sand core); phosphoric acid as a catalyst, the amount of binder amount of 35 to 75% (depending on the workshop air humidity). The use of wood modeling, the recent extensive use of multi-layer