Rapid Flexible Clamping Technology with Intelligent Self-adjustment Ability for Low Rigidity Aviation Stringer Parts

Abstract

Abstract Aviation stringer parts usually serve as the important load-bearing and connecting parts, which are widely used in aviation equipment. In the process of blank forming and transportation, the stringer parts are easy to occur irregular deformation due to low rigidity feature. In order to ensure the machining accuracy, deformation adjustment by fixtures becomes a key process step before CNC machining. In order to solve the problems of deformation adjustment clamping, the rapid flexible clamping technology with intelligent adjustment ability is developed for a kind of typical aviation stringer parts. Firstly, the process of parts deformation correction is analyzed, and the basic mechanism of clamping and deformation correction is given out. On this basis, a modular intelligent fixture is designed by finite element simulation optimization. The fixture can meet the flexible clamping requirements of stringer parts by increasing or decreasing the arrayed fixture units. Then an intelligent self-adjusting clamping control method based on the fuzzy-PID control theory is proposed, which can realize rapid clamping and deformation correction of aviation stringer parts. Finally, a set of intelligent fixture system is developed and tested. The experiment results prove the effectiveness of the fixture design and self-adjusting clamping control method. Compared with manual fixture, the developed fixture system greatly reduces the labor intensity and improves the clamping efficiency by about 5 times.