Machining Process Research On The Aircraft Landing Gear Parts Based On Lathe-mill Cutting Method

With the development of aviation technology, ultra high strength steel, titanium alloy and other new materials have been widely used in the landing gear, expect for the innovation in the design of the model, to improve its reliability. These changes have presented many higher technical requirements on the parts machining.At present, the primary load-carrying parts of landing gear tend to use the whole structure to replace the original welding structure, and these large structural parts mostly adopt the integral die forging processing to raise its fatigue properties. So the size of forgings is far larger than the finished size. For example, the material removal rate attains about 90% for the main pillar outer cylinder of a certain type of aircraft landing gear; Further more, for the complexity of its shape in design, CNC machining (before heat treatment) needs at least 10 days under current processing situation. At the same time, for the low professional level and the instability process of NC machining, the low efficiency and unstable product quality phenomena high frequently occurs.In the view of the characteristics of aircraft landing gear main load bearing structure such as the complexity in design, the difficulty in numerical control processing, the high requirements of manufacturing level, and the high diversity in processing, this thesis carried on following works based on the high precision lathe-mill cutting center:milling machining process optimization research work of cutting parameters, the secondary development of post processing system and simulation system for turn milling machine and the optimizing of the process parameters of a typical landing gear, these works significantly have improved the machining efficiency of undercarriage parts (processing efficiency is improved by more than 30%), also greatly improved the development of our aircraft landing gear manufacturing industry level; these works are of great significance in the fatigue manufacturing technology research, and will greatly promote equipment manufacturing capacity in this field, is helpful for the utilization of new material and the application of new processing to the new model plane. These works will also improve the manufacturing capacity of the domestic aviation enterprise.