组合式化粪池钢模具加工时需要注意①壁厚应尽量均匀一致，脱模斜度要足够大。②过度部分应逐步圆滑过渡，防止有尖角、锐边产生。特别是pc产品一定不要有缺口。③浇口、流道尽可能宽大、粗短，且应根据收缩冷凝过程设置浇口位置，必要时应加冷料井。④模具表面应光洁，表面粗糙度值低。⑤排气孔、槽必须足够，以及时排出空气和熔体中的气体。

During the processing of the steel die for the combined septic tank, it is necessary to pay attention to the uniformity of the wall thickness as far as possible, and the slope of the mold release should be large enough. Over part should be gradually smooth transition to prevent the sharp edge, sharp edge production. In particular, PC products must not have a gap. The gate and channel are as wide and short as possible, and the gate position should be set according to the shrinkage and condensation process, and the cold material well should be added when necessary. (4) the surface of the mould should be smooth and the surface roughness is low. The exhaust holes and grooves must be sufficient to discharge the air and the gas in the melt in time.