神舟飞船防热大底钻孔工艺技术研究

神舟飞船防热大底主要为玻璃钢蜂窝夹层结构,制孔时在较大装夹力下容易产生弹性变形。针对装夹变形导致孔位置精度难以保证的问题进行工艺优化改进,对工装结构、装夹方式、工艺流程及钻孔设备进行了优化。试验结果表明,采取低应力装夹方式、减少翻转次数、使用数控加工设备等措施能有效提高钻孔精度。

Drilling Technology Research of Heatshield of Shenzhou Spacecraft

The heatshield of ShenZhou spacecraft is mainly composed of FRP honeycomb sandwich structure. Aiming at the problem that the hole position accuracy is difficult to guarantee due to the clamping deformation, the process optimization and improvement are carried out. The tooling structure, clamping method, process flow and drilling equipment are improved. The test results show that the drilling accuracy can be effectively improved by adopting the low stress clamping method, reducing the turnover times and using the numerical control processing equipment.