对精密铸件的黑点缺陷进行了分析,通过改进浇注系统,在内浇道放置陶瓷过滤片,以及采取缩小内浇道或内浇道宽度的方法,可以有效地消除黑点。另外,对脱蜡后型壳内的残蜡要彻底消除,在精炼和浇注时,要注意脱氧和浇注操作工艺的合理性。
Black point defects in investment casting stainless parts were analyzed.Through adjusting gating system,setting filter screen at ingate to filter and purify liquid metal,and reducing ingate area or runner width,black point in the casting can be greatly eliminated.In addition,removal of residual wax should be completely cleaned,and rational deoxide operation should be noted in process of refinery and pouring.
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