Group 1 - The core achievement of AVIC Xi'an Aircraft Industry Group is the successful development of a 12-meter horizontal dual five-axis mirror milling equipment and mirror milling process technology, addressing the manufacturing challenge of ultra-large, ultra-thin skin parts that are prone to deformation due to their weak rigidity [1][2] - The large curved skin of the domestically produced Y-20 transport aircraft is characterized as a "metal film," combining ultra-large size and ultra-thin properties, which makes it a typical weak rigidity component that is difficult to process with traditional CNC equipment [1] - The company has established a technological system for the processing of large curved skins through collaborative efforts in innovation and research, overcoming multiple core technical challenges [1] Group 2 - The successful development of the new milling technology provides strong support for the research and mass production of China's Y-20 and C919 aircraft, highlighting the country's independent innovation capabilities in high-end aerospace manufacturing [2] - The innovative design of the "stress line closed thermal symmetrical space frame within a frame" structure has broken through the design bottleneck of large horizontal five-axis machine tools, meeting the automation and high-precision processing needs for ultra-large, ultra-thin skins [1][2] - The technology includes dual five-axis linkage mirror synchronous control and real-time closed-loop measurement of wall thickness, addressing technical challenges in the mirror milling CNC system [1]

Group 1 - The core viewpoint of the news is that AVIC Xi'an Aircraft Industry Group has successfully developed a 12-meter horizontal dual five-axis mirror milling equipment and mirror milling process technology to address the manufacturing challenges of ultra-large and ultra-thin skin parts, filling a domestic gap [1][2] Group 2 - The Y-20 large transport aircraft features a large curved skin that is described as a "metal film," which presents significant challenges during processing due to its weak rigidity and susceptibility to deformation from external forces [2] - Traditional CNC equipment is inadequate for processing flexible deformations and real-time wall thickness control, making the machining of ultra-large and ultra-thin skins a significant challenge in the aircraft manufacturing sector [2] - AVIC Xi'an has established a technological system for the dual five-axis mirror milling of large curved skins, overcoming several core technical challenges through collaboration with universities and research institutions [2] - The innovative design of the "stress line closed thermal symmetrical space frame within a frame" has broken through structural design bottlenecks, meeting the automation and high-precision processing needs for large aircraft's ultra-large and ultra-thin skins [2] - The new equipment is equipped with dual five-axis linkage mirror synchronous control and real-time closed-loop measurement control for wall thickness, addressing technical challenges in the mirror milling CNC system [2] - The development of flexible surface workpiece contour matching processing methods has resolved issues related to overall deformation of large thin-walled parts, enabling rapid clamping and automated mirror milling of any shape skin [2] - The successful development of this technology provides strong support for the research and mass production of China's Y-20 and C919 aircraft, showcasing the country's independent innovation capabilities in high-end aviation manufacturing [2]