3D打印技术在叶片精铸上的应用

Application of 3D Printing Technology in Blade Precision Casting

详细阐述了基于3D打印技术精密铸造叶片的铸造工艺方法:(1)将型芯切分为4块砂芯,最底层芯为浇道芯,第2层芯为下部叶柄,第3层芯为叶片芯,最上层芯包含上部叶柄及补缩冒口,切分时将叶片结构全部放置于叶片芯中;(2)整个叶片结构的补贴设计为0.8 mm,涂料的涂层厚度控制在0.3 mm内,流涂后将砂芯放置在低温烘干窑中烘干24h;(3)根据型芯序号将型芯组好,并用卡箱螺杆将芯组卡紧固定。生产结果显示:3D打印的型芯精度高,砂型表面质量好,工艺设计不再受产品结构限制,不仅简化了工艺设计难度,铸件的补贴量也比传统铸造大幅度减少。

The casting process of blade based on 3D printing technology was described in detail:(1)The core was cut into four pieces of sand core,the most bottom core was gating core,the second layer of core was lower blade stem,the third layer core was the blade core,the top layer core contains upper blade stem and feed riser,when splitting,the whole blade structure was put into the blade core.(2)The allowance for the whole blade structure was designed as 0.8 mm,the thickness of the coating layer was controlled in range of 0.3 mm,after flow coating the sand cores were dried for 24 h in low temperature drying stove.(3)The cores were assembled according to their order numbers,fasten and fixed with clamping screw stems. The production result showed:the precision of 3D printed cores was high,the surface quality of sand mold was good,the method design was no longer restricted by product structure that not only simplified the method design difficulty,the design allowance also significantly reduced compared with traditional casting process.