采用酚醛树脂砂壳芯生产内腔形状复杂,壁厚不均匀的492Q发动机铸件,由于壳芯硬脆,壳芯破损率很高.我厂研究在酚醛树脂中加入树脂量5~8%的BZ101 (苯甲酸-缩丙 Phenolic resin sand shell core production cavity shape is complicated, the wall thickness is not uniform 492Q engine castings, due to shell hard and brittle, shell core damage rate is high.I plant research in the resin by adding 5 to 8% of the amount of BZ101 (Benzoic acid - shrink syrup