Recently, the 4-second electromagnetic ejection microgravity experimental device, which is jointly manufactured by North Vehicle Group under China North Industries Group Corporation Limited (NORINCO GROUP) started trial operation. North Vehicle Group overcame difficulties such as short time and heavy tasks, reasonably utilized processing resources and production capacity, and completed the production tasks of over 2000 main structural components and thin-walled experimental cabins with high quality. In the end, the 40 meters high main structure, which was spliced with 16000 sets of high-strength bolts, passed 100% inspection on all technical indicators and successfully completed the manufact