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１问题的提出武钢集团大冶铁矿选矿所用的球磨机需要较大数量的模球，规格有Φ６０、Φ８０、Φ１００和Φ１２５几种，生产任务由大冶铁矿机修厂承担。模球铸造所用铸模结构如图示。由于模球需求量较大（约７０吨／年），产品尺寸一致性要求较高，所以我们采用经济型数控技术
1 PROBLEM PROBLEM Ball mill used for ore dressing in Daye Iron and Steel Group of WISCO requires a large number of ball molds with specifications of Φ60, Φ80, Φ100 and Φ125. The production tasks are undertaken by Daye Iron Works. Die casting mold used in the structure shown. Due to the large demand for the dome ball (about 70 tons / year), product size consistency requirements, so we use economical CNC technology