大型挖泥泵叶轮铸造缺陷分析及其对策

Casting Defects Analysis for Large Excavating Pump Impeller and Its Countermeasures

叶轮是整个挖泥泵的核心过流部件，其质量要求很高。大型挖泥泵叶轮铸件容易出现缩孔、气孔、冷隔等铸造缺陷。详细分析了叶轮不同部位缺陷产生的原因，针对浇冒口系统、型砂工艺、涂料、浇注工艺及打箱清理工序制定了防止缺陷产生的相关对策，使生产的大型挖泥泵叶轮铸件合格率达到95％以上。

As the critical overflowing assembly of the excavating pump, its quality requirements are higher. The large excavating pump impellers were easy to appear shrinkage, blowhole shrinkage and cold shut. The related countermeasures to prevent defects are formulated for gating system and riser, molding process, coating, pouring process, shakeout and impeller reaches to above 95%. cleaning. Thus the yield of large excavating pump