基于相似原理对铜叶轮真空低压铸造过程进行了模拟实验研究。实验结果表明:铜液上升的液面一直保持水平状态并沿着铅垂方向推进;当加压气压为0.02 MPa,真空度为-0.02 MPa时为最佳的工艺参数。将模拟实验结果和原型的结果进行了比较,两者具有良好的一致性。 Based on the principle of similarity, a simulation experiment on the vacuum low pressure casting process of copper impeller was carried out. The experimental results show that the rising liquid level of copper liquid keeps horizontal and advances along the vertical direction. The optimal process parameters are the pressure of 0.02 MPa and the vacuum degree of -0.02 MPa. The results of simulation experiment and prototype are compared, the two have good consistency.