复合材料双曲面NOMEX蜂窝加工技术研究及应用

Research Progress and Application of Hyperboloid NOMEX Honeycomb of Composite Materials

以复合材料双曲面Nomex蜂窝芯为研究对象,重点开展弱刚性双曲面蜂窝数控铣削及检测技术,采用高速铣削加工工艺,通过优化加工编程策略,选取合理的加工参数,能有效解决双曲面蜂窝芯零件成型后精度问题。研究结果表明,采用加工检测一体工装能解决弱刚性蜂窝固持问题,有效提高蜂窝芯成型精度。对蜂窝芯在线检测后,利用校验膜技术,对蜂窝零件预装配,结果表明双曲面蜂窝芯成型后与上下蒙皮装配间隙小于0.15mm;蜂窝芯拼接缝小于0.2mm;未在蜂窝分段处产生明显阶差。经校验膜验证,蜂窝芯格能完整复现在校验膜上,成型面上无蜂窝芯格撕裂、损伤等缺陷,其装配精度满足要求。

Aiming at hyperboloid NOMEX honeycomb of comgposite materials, this article focused on the honeycomb CNC milling and detection technology by using machining and test tool. Using high speed milling process, though optimizing the processing programming strategy and selecting the suitable machining parameters, we could effectively solve the forming accuracy of the hyperboloid honeycomb core parts. This result showed that adopting processing and testing integrated tooling could effectively solve the problem of fixation of the weak rigidity honeycomb as well as improving the cell forming precision. After the online detection of the honeycomb core, we could use the technology of forming verification film by pre-assembling the cell part and the upper and lower skins, and the assembly tolerance between the upper and lower skins and the honeycomb part was less than 0.15mm, splicing tolerance between each separated cell was less than 0.2mm. There was no obvious difference segment in the splicing location. According to the result of verification film, honeycomb core could be fully restored to the current verification film, without tearing, damage and other defects in the forming surface of honeycomb core. It showed that its assembly accuracy meet the requirements.