1.湿强变,可塑性,透气性,防止粘模; 2.封闭式,开放式,封闭—开放式,半封闭式; 3.公式法,线图法,表格法; 4.结构,阻力,流速,紊流凝固; 5.收缩,应力集中,变形和裂纹; 6.计算浇注时间t;计算型腔内金属液面平均上升速度v,计算内浇口总截面积ΣF_内,确定浇注系数各组元的比例关系; 7.烘干温度,烘干时间,粘结剂的性质,砂型的断面厚度,含水量; 8.铸件结构,尺寸大小,技术要求,生产数量,生产条件; 1. Wet strength, plasticity, breathability, to prevent sticking; 2. Closed, open, closed - open, semi-closed; 3. Formula method, Flow rate, turbulent solidification; 5. Shrinkage, stress concentration, deformation and cracks; 6. Calculate pouring time t; Calculate the average velocity of liquid metal cavity v, calculate the total gate area ΣF_, to determine the pouring coefficient The proportion of the various components; 7. drying temperature, drying time, the nature of the binder, sand section thickness, water content; 8. castings structure, size, technical requirements, production quantity, production conditions;