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我们采用的是水玻璃——氯化铵硬化制壳工艺,尽管严格地实施工艺,但铸件仍发现存在鼠尾、夹皮、夹砂及跑火等缺陷,废品率在19.5%左右。后来我们通过改变涂挂方法(原工艺不变),铸件质量得到提高,废品率降到了7.4％以下。 一.原涂挂方法及存在问题 我们是人工操作进行涂挂,涂挂过程是:将模组首先浸入涂料中,左右上下晃动,取出模组,待其上剩余的涂料不再连续下滴时,开始撤砂;撒砂后风干一段时间,开始硬化;把模组自硬化液中取出后,挂在架子上再进行风干;如此循环,制成多层型壳。
We use water glass - ammonium chloride hardening shell process, despite the strict implementation of the process, but the casting still found the presence of rat tail, nip, sand and fire and other defects, rejection rate of about 19.5%. Later, we changed the coating method (the original process unchanged), casting quality has been improved, the rejection rate dropped to 7.4%. First, the original coating hanging methods and problems We are manually operated to paint hanging, coating hanging process is: the module first immersed in paint, shaking up and down, remove the module until the remaining paint is no longer when the drop , Began to remove sand; sand drying for a period of time, began to harden; the module removed from the hardening liquid, hanging on the rack and then dried; so cycle, made of multi-layer shell.