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阀门闸板是低压阀门上的重要部件,我厂生产的各种不同规格的闸板铸件一般重4～20公斤,平均壁厚8～15毫米,材质HT20-40。铸件技术条件(其两侧均为重要工作面,不允许有任何铸造缺陷)要求较高,其质量的优劣,直接影响着阀门的内漏问题。其工作情况如图1所示。闸板生产初期,其浇口系统是直接用手工开设的,由于浇口形式和位置选择的不当,浇口各单元截面积未经理论计算,曾一度造成铸件废品率高达
Valve gate is an important part of the low-pressure valve, I plant a variety of different specifications of the gate castings generally weigh 4 ~ 20 kg, the average wall thickness of 8 to 15 mm, material HT20-40. Casting conditions (both sides of both sides of the important work surface, does not allow any casting defects) higher requirements, the quality of its advantages and disadvantages, a direct impact on the valve leakage problem. Its work shown in Figure 1. Gate early production, the gate system is directly set by hand, due to improper choice of gate form and location, gate unit cross-sectional area without theoretical calculations, once caused the casting scrap rate as high as