Design method of airplane frame and rib type sheet metal part processing model

Abstract

The invention belongs to the technical field of aircraft manufacturing, and relates to a design method of an airplane frame and rib type sheet metal part processing model. According to design model of a part, a part processing model which can be directly applied to mold working molded surface design is designed. The design method is applicable to a frame and rib flange part with a variable camber, a variable cross-section, subsidence and a purlin notch. The design method is based on a flange reference plane, and the flange springback and compensation are taken into account.

Description

technical field [0001] The invention belongs to the technical field of aircraft manufacturing, and in particular relates to a method for designing a process model of an aircraft frame and rib sheet metal part. Background technique [0002] Frame rib parts are the main parts of aircraft sheet metal parts. They are often used in wing ribs, fuselage bulkheads, etc., and are mostly overlapped with the skin. More than 50% of the amount. The web of the part is mostly flat or slightly curved, and there are flanges around it, and there are often sags and stringer notches on the flanges. As the complexity of the aircraft shape increases, the flange is generally a curved surface with variable curvature and variable cross-section characteristics. The part webs targeted by the present invention are planar. Part instances such as figure 1 shown. [0003] As an important part of the aircraft structure, frame rib parts directly affect the shape accuracy and structural bearing capacity...

AI Technical Summary

Problems solved by technology

However, the number of single pieces of frame-rib parts is small, the variety is large, the size changes greatly, and the structural characteristics are difficult to parametrically express, which also brings difficulties to the determination of the springback correction intermediate state model of frame-rib parts, that is, the definition of the process model of frame-rib parts

[0007] In actual production, the process model design and forming mold design of rubber bladder hydroforming frame rib parts did not consider the springback prediction and compensation, and only carried out sinking deepening treatment in the sinking area to prevent interference; in papers and journals, Han Shengxia and Yan Hongyong In the research on the design technology of hydroforming dies, it is proposed to discretize the section of the part and use the discrete section to express the method of hydroforming parts. The information of curved parts is represented by the bending angle and bending radius contained in the two-dimensional section line. However, it is only limited to the research on linear flanged parts and various independent regular flanged expressions, and does not involve the research on flanged parts with variable cross-sections or the flanged expression when the curvature of the flange line changes, and the consideration of complete parts. Research on Process Model Design of Spring Compensation

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