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1996年底，我厂首次试制ZL30E变速器，其主要部件——变速器壳体及大端盖均为铸铁件。作为传动的主要部件，对铸件的质量要求较高，尤其是对结构复杂的大端盖要求更高（如图1）。大端盖的材质为HT200，内部铸有铜管，管口用堵头以紧配合封闭，由于易发生铜管烧伤，因此铸造工艺
The end of 1996, the first trial of our plant ZL30E transmission, the main components - the transmission housing and large end caps are cast iron parts. As the main components of the transmission, the casting quality requirements are higher, especially for the complex structure of the larger end cover requirements (Figure 1). Large end cap made of HT200, the internal cast copper tube, the nozzle with a tight fit closure, due to the prone to copper tube burns, so the casting process