Analysis of Laser Positioning Milling Process for Aircraft Cabin Door Opening

Abstract

AbstractOne of a main characteristics of aircraft manufacturing is to solve a lot of interchange and coordination problems in process preparation and production. Traditionally, analog quantity transfer method is adopted, which can not meet the manufacturing requirements of “low cost, short circle and high quality”, based on the three dimensional design model and the advanced measurement device of aircraft, it is an effective way to establish and adopt the interchange and coordination model of digital quantity transfer to meet the needs of modern aircraft development, with the rapid development of computer and numerical control technology, digital technology is gradually applied to the field of aviation industry, the level of aircraft design and manufacturing technology has been greatly improved. In terms of assembly technology, digital technology is used in some parts, but analog quantity transmission is still the main coordination method of many aircraft manufacturing enterprises, and special tooling assembly is still used in assembly. Hoped that all aircraft manufacturing enterprises can achieve new breakthroughs in digital assembly technology. The application of digital technology will bring great changes to the manufacturing and inspection process. Under traditional conditions, after assembly, the products can be measured and inspected by analog equipment such as tooling and standard measuring tools. Under the conditions of digital manufacturing, due to the application of direct installation technology such as numerical control technology and laser tracker, the necessary tools such as frame and measuring tools are reduced. In this paper, the problem of interchange and coordination in milling the opening of rear cargo door frame of a cargo aircraft studied. Referring to the traditional aircraft interchange and coordination theory, and combined with the characteristics of aircraft digital manufacturing technology. The key technology of aircraft manufacturing interchange and coordination based on digital quantity transfer is studied. The laser aided positioning and milling technology for the opening of rear cargo door frame of a cargo aircraft is based on rear cargo door frame product digital model and Drawings, and with the help laser tracker, the positioning, marking and milling of frame door opening of the aircraft fuselage door frame are carried out. The advantages of this technology way are: it can save a set of tooling for milling the door frame opening, and no matter how to modify the drawing/digital model size of the door frame opening, this technology way can complete the milling of the door frame with the fastest speed, and adapt to and meet the latest size requirements of the drawing/digital model (because the use of laser tracker does not need to spend the time and cost of designing, modifying and manufacturing tooling).KeywordsAssembly positioningPositioning datumLaser positioningLaser measuringCut and milling