一、前言在熔模精密铸造生产过程中,涂制型壳的工艺方法极为重要,它直接影响着铸件的质量。目前在国内熔模精密铸造生产中,由于各厂的具体条件与其要求不同,所采用的制壳工艺方法也不相同。多年来,我厂所采用的涂制型壳工艺仍是采用四层半悬链涂制,只有很少几种特殊的零件尚须手工涂制五层。型壳的总厚度在5~6毫米左右,此厚度对于重量在 I. Preface In the process of investment casting, the craft of coating shell is very important, which directly affects the quality of castings. Currently in the domestic investment casting precision casting, due to the specific conditions of each plant and its requirements are different, the use of the shell process is not the same. Over the years, I used the plant coating process is still using four-layer semi-hanging chain system, only a few special parts still have to manually paint the five-story. The total thickness of the shell is about 5 ~ 6 mm, the thickness of the weight in