大跨度起落架工件中微小孔的高精度制造

2019-03-14

作者：何多政，任建华，郭辉，许锋国单位：中航飞机股份有限公司长沙起落架分公司

摘要：前起上撑杆组件作为某型号飞机起落架的重要结构件，部件材料为新型材料300M，受其结构及材料强度影响，前起上撑杆轴颈处6+0.10+0.05mm传感器安装孔加工极为困难。在分析产品研制阶段暴露问题的基础上，设计制造带定心功能的专用复合中心钻，解决了螺纹表面钻孔偏摆问题。通过切削对比试验，确定了加工6+0.10+0.05mm传感器安装孔的切削参数，通过工艺过程改善、钻模改进和刀具优化，实现了前起上撑杆组件大跨度、细小孔加工技术，不但保证了高位置精度小孔的加工要求，而且满足产品配套件的互换性。该工艺方法适用于类似大组件的产品加工制造，专用复合中心钻可作为微小孔定心加工的一款辅助工具。

关键词：超高强度钢；微小孔；复合中心钻

中图分类号：TG52；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.03.026

Highprecision Manufacturing for Small Holes in

Workpieces of Longspan Landing Gear

He Duozheng，Ren Jianhua，Guo Hui，Xu Fengguo

Abstract:The front support rod assembly is an important structural part of a certain aircraft landing gear.The component material is a new material 300M.Affected by its structure and material strength，the sensor hole at the front support rod shaft neck is extremely difficult to process. Based on the analysis of the problem in the development stage of the product，a special composite center drill with centring function is designed and manufactured to solve the problem of drilling bias in the threaded surface.Through the cutting comparison test，the cutting parameters for the installation hole of the processing case are determined.And through the improvements of the process，and the drilling jig and the optimization of the tool，the largespan and smallhole machining technology of the frontmounted support assembly is realized to not only ensure the processing requirements of the highposition precision small hole，but also satisfy the interchange ability of the accessory parts.The process method is suitable for the manufacture of similar large components，and the special composite center drill can be used as an auxiliary tool for microhole centring processing.

Keywords:ultrahigh strength steel；microholes；composite centre drill