在深入分析ＶＲＨ法和热芯盒制芯法优缺点的基础上，提出了对砂芯进行１００℃预热，再在加热条件下抽真空硬化的ＨＶＨ制芯方法。采用这种方法制取水玻璃砂芯时，水玻璃加入量可降到２．５％，砂芯强度可达１．３６～１．４６ＭＰａ，而且工艺工装比较简单，砂芯硬化速度快，生产率比较高，砂芯溃散性得到明显改善。 On the basis of deeply analyzing the advantages and disadvantages of VRH method and hot box core making method, HVH core making method of preheating sand core at 100 ℃ and vacuum hardening under heating condition is proposed. When using this method to make water glass sand core, the amount of water glass can be reduced to 2.5%, the sand core strength can reach 1.36 ~ 1.46MPa, and the process tooling is relatively simple, the sand core hardening speed, productivity Higher, the sand core collapses have been significantly improved.