Method for forming control of long joist axial line of composite material stiffened wall panel

Abstract

The invention belongs to technologies of composite material forming, and relates to a method for forming control of a long joist axial line of a composite material stiffened wall panel in an aviation aircraft. The method is a fixture method suitable for forming control of long joist axial lines of various types, such as a T shape, an I shape, a J shape and the like, of long joist composite material stiffened wall panels. A forming fixture mainly comprises a long joist forming mold A and a long joist forming mold B, a skinned curing mold, a cushion block and an axial line positioning mold. The two ends of the long joist forming mold A are designed to be dovetail-shaped and are closed matched with the axial line positioning mold to control the deviation of a long joist in the length direction of the axial line; and the axial line positioning mold is fixed on the skinned curing mold through positioning pins to control left and right deviations of the long joist axial line. By the forming fixture method, the molding surface quality and the position accuracy of a long joist product are effectively improved, and the long joist axial line is prevented from deviation.

Description

technical field [0001] The invention belongs to composite material forming technology, and relates to a method for controlling the axis forming of long truss axis of composite material reinforced wall plate in aviation aircraft. Background technique [0002] Composite materials are more and more widely used in aircraft structures due to their excellent properties such as high specific strength and specific stiffness. At present, the newly developed aircraft at home and abroad not only use composite materials in the structure of the horizontal stabilizer, aileron, and vertical tail, but also use composite materials in the main structures such as the fuselage and wing box, which makes the structure highly integrated and the system installation It is relatively simple, reduces the number of parts, and shortens the assembly time. The extraordinary physical properties and designability of composite materials, as well as the reduction in production costs in recent years, has acce...

AI Technical Summary

Problems solved by technology

In the forming process, stringer molds and skin curing molds are involved, and the requirements for the cooperation between the molds are relatively high. The forming process and pressure transmission are much more complicated than those of flat plate members, and since the stringer molds in the forming molds are in a free state, It is difficult to control the axis of the long truss during the forming process, and it is easy to shift

[0004] At present, with the development of composite materials in the direction of integration, large-scale and complex, the structure of composite reinforced wall panels is becoming more and more complex, the size is getting larger and larger, and the pressure transmission during the forming process is also becoming more complicated. It is easy to make the stringer mold shift, deflect or twist during the forming process, it is difficult to guarantee the accuracy of the stringer axis, the thickness of the stringer is also difficult to control, and it becomes difficult to demould the product after curing; at the same time, with the development of digital technology With the development, the assembly of subsequent components has higher and higher requirements on the precision of the long truss axis.

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