钛合金精密铸件结构复杂，往往是薄壁并有大型内腔。有些回转件腔大口小，制作蜡模模具时，无法按常规开模，蜡模起模结构复杂，模具设计和制造难度大、成本高。为了满足大批量生产需求，采用水溶蜡芯制做了复杂且具有精细结构的蜡模。结果表明，蜡模尺寸精度显著提高，可达CT3，表面粗糙度≤3.2 μm，蜡模内腔无需修补，蜡模生产效率提高近1倍。采用新方法所生产的铸件内外缺陷减少了70%，显著降低了成本，提高了生产效率和铸件质量稳定性。

Titanium alloy investment precision castings have complex structures, are often thin-wall and have large cavities. Some rotational parts have large cavities and small openings. When making wax pattern die, conventional parting method is quite difficult, the wax die striping structure is complicated, the wax pattern die design and manufacturing are difficult and the diecost is high. In order to meet the needs of mass production, water-soluble wax core is used to make wax pattern with complex and fine structure. The results show that the dimensional accuracy of wax pattern is significantly improved, reaching CT3, and the surface roughness is ≤3.2 μm. There is no need to repair the inner cavity of wax pattern, and the production efficiency of wax pattern is nearly doubled. The internal and external defects of castings produced by the new technology are reduced by 70%, the cost is reduced, and the production efficiency and the quality stability of the castings are improved.