Co-curing forming technological method of variable-curvature composite stiffened wall plate

Abstract

The invention belongs to the technical field of composite manufacturing and relates to a co-curing forming technological method of a variable-curvature composite stiffened wall plate. The co-curing forming technological method of the variable-curvature composite stiffened wall plate comprises the following steps of manufacturing a flexible long purlin core mold, conducting laying and pasting on a composite wall plate skin and a long purlin, assembling a long purlin green body and the skin and conducting packaging and curing formation. According to the co-curing forming technological method of the variable-curvature composite stiffened wall plate, the flexible long purlin core mold is used as the forming core mold, the flexibility of rubber and the rigidity, low density and other features of a fiber composite are combined, the composite flexible long purlin core mold is used for replacing a metal core mold and formed into a continuous structure, the rigidity of the core mold is controlled by adjusting the ratio of rubber in the flexible long purlin core mold, the long purlin green body with the composite part is laid and pasted to a laying and pasting mold, then the long purlin green body is transferred to a flexible long purlin mold, the long purlin is located to a skin blank through a long purlin locating clamping plate, the co-curing technological method is adopted to manufacture the stiffened wall plate of a variable-curvature structure, and during operation, the stiffened wall plate of the variable-curvature structure is easy to attach to a technology piece and is not influenced by curvature and shape.

Description

technical field [0001] The invention belongs to the technical field of composite material manufacturing, and relates to a co-cured variable curvature composite material reinforced wall plate forming process method. Background technique [0002] Composite materials are more widely used in various complex reinforced wall panel structures. As a structure with high difficulty in forming, variable curvature reinforced wall panels have the characteristics of large curvature changes, complex mold manufacturing and process molding. The traditional molding process of reinforced wall panels is glued and cured, so that the skin or stringer is first cured, and then glued and cured again with the other uncured part. This curing method is likely to cause local concentration of the overall internal stress of the part, resulting in Deformation and other issues, and multiple curing will inevitably lead to an increase in energy costs. In addition, the mandrel of the truss is generally made o...

AI Technical Summary

Problems solved by technology

The traditional molding process of reinforced wall panels is glued and cured, so that the skin or stringer is first cured, and then glued and cured again with the other uncured part. This curing method is likely to cause local concentration of the overall internal stress of the part, resulting in Deformation and other issues, and multiple curing will inevitably lead to an increase in energy costs

In addition, the mandrel of the truss is generally made of metal materials, and for the truss of the variable curvature structure, because the curvature of the shape of the truss changes greatly, the metal mandrel will produce large deformation during machining, and the correction is difficult and costly. Segmentation of the metal mandrel can reduce processing deformation and reduce the maintenance cost of the mandrel. It has better operability when forming composite long trusses with small longitudinal curvature structures. However, it is difficult to operate and ensure the internal quality of composite materials, and the traditional positioning method of long truss clamps does not have the function of adjustment

The disadvantages of the traditional process method are mainly as follows: 1) The metal long-truss mandrel used has a high density, and the weight of a single mold is relatively large, which makes it difficult to transport and assemble; If there is a large difference, the parts are easy to deform after curing, and the cost is higher if the metal with a low thermal expansion coefficient is used; 3) The metal long truss mandrel is easy to deform after use and needs to be re-calibrated, and the calibration cost is high; 4) When it comes to metal mandrel- When the metal mandrel is matched to form a composite T-shaped truss, the two metal molds are difficult to cooperate with each other, and it is easy to cause the phenomenon that they cannot be bonded, which affects the internal quality of the composite material truss; 5) The deformation of the clamping plate will affect the positioning accuracy, and the correction Deformation requires high cost

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