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一、铸件的基本要求阀门是流体管路的控制装置。生产的铸钢件系P_(54) 100/175阀体,材质:ZG20CrMoV,铸件重:370kg,工作温度:540℃,工作压力:10MPa。该零件是一种承受高温、高压的容器,因此,要求铸件组织精致无缩孔、缩松及裂纹等缺陷。而ZG20CrMoV属易裂钢种,铸件结构又较复杂,壁厚不均,因此,生产该产品的难度较大。二、原工艺设计及存在问题 1、第一次工艺方案与裂纹位置第一方案如图一所示。内浇道(共4道)从芯头进入。设3只暗冒口,型芯采用烘模粘土砂,使用铸铁芯骨,浇注温度:1480～1500℃(光学高温计读数未校正)。用这种方案生产,铸件几乎百分之百产生裂
First, the basic requirements of the casting valve is the fluid piping control device. Production of steel castings Department P_ (54) 100/175 valve body, material: ZG20CrMoV, casting weight: 370kg, working temperature: 540 ℃, working pressure: 10MPa. The part is a high temperature and pressure to withstand the container, therefore, require the casting of fine tissue without shrinkage, shrinkage and cracks and other defects. The ZG20CrMoV is a flexible steel, casting structure is more complicated, uneven wall thickness, therefore, the production of the product more difficult. Second, the original process design and problems 1, the first program and crack location The first program shown in Figure 1. The gate (a total of 4) from the core into. Set 3 dark riser, the core using baking clay sand, the use of cast iron core bone, casting temperature: 1480 ~ 1500 ℃ (optical pyrometer readings are not corrected). Produced with this solution, the casting is almost 100% cracked