S-section sag-free aircraft frame and rib sheet metal part springback compensation calculation method

• Main Authors: LU QI'AN, HU YALING, LIU CHUANG
• Format: Patent
• Language: English
• Published: 04.03.2015
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention relates to the field of aircraft manufacturing and design, in particular to an S-section sag-free aircraft frame and rib sheet metal part springback compensation calculation method. The method includes the steps: firstly, reconstructing a profile surface after springback compensation calculation on the basis of an outer-edge flange enlarged surface S established based on a part outer-edge flange F(O); secondly, subjecting a profile enlarged surface of a part inner-edge flange stiffened edge F2 to springback compensation calculation and constructing an inner-edge flange stiffened edge springback compensation profile surface S2<RI'>; thirdly, jointing the inner-edge flange stiffened edge profile surface S2<RI'> after springback compensation with the profile surface of a part inner-edge flange F1, and performing springback compensation calculation and reconstruction on the basis of a joint profile surface. The method which adopts single compensation values based on the flange profile surface is applicable to S-section sag-free variable-curvature frame and rib flange parts.