一、铸件的技术要求和结构特征 凸轮轴中座盖是半吨载重汽车发动机的重要零件,在高转速下工作,铸件不得有气孔与缩孔,组织致密,表面光洁不得有冷隔、花纹。经加工后,直径大于φ1毫米的气孔不得多于2个。该铸件平均壁厚为12毫米,最大壁厚18毫米,最小壁厚5毫米,铸件投影面积68厘米~2,浇道面积32厘米~2,模具两侧均设斜销抽芯,在J1113A型卧式冷式压铸机上生产,压室直径φ50毫米,压射比压70.1MPa材料ZL107。 First, casting technical requirements and structural characteristics Camshaft seat cover is an important part of the semi-ton truck engine, work at high speed, castings can not have pores and shrinkage, dense, smooth surface without cold, pattern. After processing, there shall be no more than two pores of diameter greater than 1 mm. The average wall thickness of the casting is 12 mm, the maximum wall thickness is 18 mm, the minimum wall thickness is 5 mm, the projection area of ​​the casting is 68 cm ~ 2 and the runner area is 32 cm ~ 2. Horizontal cold die-casting machine production, pressure chamber diameter φ50 mm, the injection pressure ratio of 70.1MPa material ZL107.