传动箱体消失模铸造工艺中的缺陷问题

为了解决消失模铸造传动箱体中铸件结构复杂、上口处容易变形、加工量较小、工艺设计及制造难度较大、容易造成废品等问题,从铸件模型的生产过程出发,根据铸件的结构特点,分析了模型废品产生的原因,对浇注系统的设计及造型过程进行了改进研究,对铸造生产过程中存在的冷隔缺陷、水汽冷隔缺陷、铸件起包、涂料夹渣、内浇口部位夹渣、泥条夹渣、内浇口处黏砂、硬木条处黏砂等问题提出了具体的解决方案,使传动箱体的成品率稳定控制在95%以上,为传动箱体消失模铸造类似产品的生产提供了很好的借鉴依据,对消失模铸件的生产具有一定的参考价值。

Foundry technology flaws in expendable casting of transmission cases

In order to solve problems in expendable casting of transmission cases, such as complicate casting structure, easy transformation of the upper opening, small processing amount, difficult design and manufacture, likely causing waste and so on, starting from the preparation process of casting model, the reason that model waste appears is analyzed according to casting structure characteristics. The design of the gating system and the modeling process are studied for improvement, and solutions for the problems in casting process, such as cold lap flaw, moisture cold lap flaw, casting swell, coating slag inclusion, flow gate slag inclusion, mud strip slag inclusion, flow gate clogging, hardwood strip clogging and so on, are provided. The actual expendable casting product yield rate is more than 95%. The study provides a reference for the preparation of transmission cases with expendable casting and other products alike, and a reference for evanescent mode casting.