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生产铝铸件中新的制芯工艺方法,不是用普通的机械方法除芯,而是将型芯浸入冷水中。于是,型芯很快破碎,芯砂很快从铸件中流出。这种泥芯的配比是由石英砂100份,碳酸钠、氢氧化钠4.5份,糊精1份,水2.5份组成。加入糊精是为了增强砂芯的抗冲蚀性。混砂用辗轮式混砂机效果最好,混砂时间在3～6分之间。砂型的存放时间约10小时。制芯用手工或机械制芯方法均可。硬化采用CO_2
The new core making process in the production of aluminum castings is not done by ordinary mechanical methods but by immersing the core in cold water. As a result, the core breaks quickly and the core sand quickly flows out of the casting. The ratio of this mud core is composed of 100 parts of quartz sand, 4.5 parts of sodium carbonate, 4.5 parts of sodium hydroxide, 1 part of dextrin and 2.5 parts of water. Dextrin is added to enhance the erosion resistance of the sand core. Mixing sand roller wheel mixer best, sand mixing time between 3 to 6 minutes. Sand storage time of about 10 hours. Core-made by hand or mechanical core method can be. Hardening with CO_2