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我厂以前铸造铜套时,用砂型浇铸,经常发生砂眼等缺陷,后来改用铁模铁心浇铸(如图),效率提高不少,同时还保证了质量。
When casting copper bushings in our factory, it was cast by sand mold and defects such as trachoma often occurred. Later cast iron core mold was used (as shown in figure), efficiency was improved a lot, meanwhile, the quality was guaranteed.