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Method for designing workpiece model for manufacturing aircraft sheet metal components

A technology for sheet metal parts and frame ribs, which is applied in the field of workpiece model design for aircraft frame rib sheet metal parts manufacturing, to achieve accurate calculations and solve the problems of blanking and forming workpiece calculations

Inactive Publication Date: 2010-05-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the increase in the complexity of parts and the application of digital manufacturing technology, the traditional deployment technology based on experience and trial and error can hardly meet the requirements of modern aircraft development

Method used

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  • Method for designing workpiece model for manufacturing aircraft sheet metal components
  • Method for designing workpiece model for manufacturing aircraft sheet metal components
  • Method for designing workpiece model for manufacturing aircraft sheet metal components

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Embodiment Construction

[0034] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0035] The essence of the design of the frame-rib parts manufacturing workpiece manufacturing model is to expand the structural elements of the curved surface shape formed by plastic deformation into a plane. The forming sequence of each structural element of frame-rib parts is different, and each process in the forming process corresponds to the evolution of each structural element. like figure 2 As shown, the plane web of the frame-rib part does not undergo plastic deformation, and the structural elements such as the flange adjacent to the web and the lightening hole are plastically formed by the sheet metal, with small deformation. Due to the structural characteristics of the frame-rib part, the expansion method of its structural elements is different from the method of unfolding the parts as a whole after plastic deformation occurs on all the surface surfac...

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Abstract

The invention relates to a method for designing a workpiece model for manufacturing aircraft sheet metal components. The method comprises the following steps: firstly extracting a neutral surface of the component, dividing into finite element meshes, and adopting the method of directly projecting to a plane of a web along the normal vector direction of the web for calculating the node coordinates of mesh units after flattening for non-web structural elements in the web profile; and adopting the constrained surface flattening algorithm based on unit equal deformation for calculating the node coordinates of the mesh units after the flattening for the web and curved edges to be flattened. The method faces to the key manufacturing procedure of the sheet metal components and provides a data source for the molding technology and the tooling design. The method can rapidly and precisely calculate the shape of the workpiece model for manufacturing the sheet metal components, thereby meeting the needs of digital manufacture. The method can effectively solve the problems of discharge and molding workpiece calculation in the digital manufacturing of the aircraft sheet metal components.

Description

technical field [0001] The invention relates to a method for designing a workpiece model for manufacturing aircraft frame and rib sheet metal parts, and belongs to the technical field of aircraft manufacturing. Background technique [0002] Frame rib parts are the main parts of aircraft sheet metal parts, including wing ribs, fuselage bulkheads or other skeleton parts. The web of the part is flat or slightly curved, and there are shallow flanges around it; lightening holes, positioning holes and reinforcing ridges are generally distributed on the web; there are often depressions on the flange. As the complexity of the shape of the aircraft increases, the flange is generally a curved surface with a double curvature shape. [0003] As an important part of the aircraft structure, frame rib parts directly affect the shape accuracy and structural bearing capacity of the aircraft, and its manufacture has become an important link in determining the overall performance of the aircr...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘闯王俊彪卢元杰赖长亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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