基于SLA技术的钛合金熔模精密铸造工艺

Investment Casting Process of Titanium Alloy Based on SLA Technology

采用SLA光固化成型技术和钛合金熔模精密铸造相结合的方法,从SLA光固化熔模结构设计及制壳工艺、铸件浇注工艺、热等静压等3个方面展开工艺研究。结果表明,SLA光固化中空腔体熔模原型设计及型壳直接高温焙烧的工艺合理可行,有效解决了型壳开裂的技术难题;采用离心真空浇注和热等静压工艺,可保证复杂铸件的充填性和内部质量;该工艺成功研制出符合技术要求的铸件,其表面粗糙度可达6.3μm,尺寸精度达到CT6级,综合性能满足国军标要求。

By adopting the method of SLA light curing molding technology and titanium alloy investment mold precision casting, the technological research was carried out from three aspects, such as SLA light curing investment mold structure design, shell making process, pouring process and thermal isostatic pressure. The results show that the prototype design of SLA light-curing hollow cavity and the direct high-temperature roasting technology of shell are reasonable and feasible, and the technical problems of shell cracking are solved effectively. Centrifugal vacuum casting and thermal isostatic pressure process can ensure the filling and internal quality of complex castings. The surface roughness of the castings could up to6.3 micron, and the size accuracy is up to CT6. The comprehensive performance meets the requirements of national military standards.