自硬涂料直接转移法的铸造技术

Casting Technology of Self-hardening Transferring(Non-occupying) Coating

提出了适合有机酯快速硬化水玻璃转移涂料的制备工艺和性能要求，研究了自硬水玻璃转移涂料直接转移的造型工艺。研制出高效、污染小的复合脱模荆，解决了起模难题，用专门的工艺手段克服溶剂迁移所形成的砂型低强度区，大大缩短了脱模等待时间，使造型生产率接近于传统水玻璃砂造型。结果表明：所得铸件尺寸精度达CT6—8级，表面粗糙度达Ra6．3～12μm，与水玻璃型壳熔模精密铸件相当；而与熔模铸造工艺相比，工序大为简化，成本明显下降，效率显著提高，并且对铸件尺寸没有限制。

A new casting technology of self hardening transferring （non-occupying） coating was studied systematically and preparation process and property of sodium-silicate ester hardening sand transferring coating was put forward. A new environment friendly, high efficient pattern release agent is developed and the difficulty of pattern release is solved. The productivity using the technology is similar to that of traditional sodium-silicate no-bake sand mould. The castings produced by the technology reach dimensional tolerance CT6-8, surface roughness Ra 6.3-12,gm, which are similar to that of loss wax precision casting by sodium silicate no-bake sand. Compared to the traditional loss wax precision casting, this technology is simple, cheap, efficient and no limitation to the size of castings, therefore, is worth extending in casting industry.