型砂物理性能主要是水份、强度、透气性,其中水份最重要,又难控制。目前,对型砂质量控制都是碾好后再做常规试验,这种事后检验,效果不好。因此,如何保证每批型砂都合格,这是型砂质量管理中迫切需要解决的问题。我厂用紧实率来控制型砂水份,能把型砂废品消灭在生产过程中,使型砂合格率由79年的85％上升到80年的94％;因型砂质量而造成铸件废次品率由18.2％下降到0.01％,对提高型砂质最,取得了良好效果。 Physical properties of sand is mainly moisture, strength, permeability, of which the most important water, but also difficult to control. At present, the quality control of sand are all grilled and then do a regular test, this after-test, the effect is not good. Therefore, how to ensure that each batch of sand are qualified, which is an urgent need to address the sand quality management issues. I plant with a tight rate to control the sand, can destroy the sand in the production process, so that the passing rate of sand from 85% in 79 years to 94% in 80 years; due to sand quality caused by casting scrap defective rate From 18.2% down to 0.01%, to improve the most sandy, and achieved good results.