检验了新型制芯材料PAF粉状粘结剂及复合油的主要工艺性能 ,对后桥壳体芯砂配方进行了改进 ,优化设计出适应生产实际的新配方 ,满足了生产需求。 The main process properties of new core material PAF powder binder and composite oil were tested. The core sand formulation of rear axle shell was improved, and the new formula that was adapted to the actual production was optimized to meet the production demand.