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Modeling method for two-dimensional variable-curvature process model of section bar part

A technology of process model and modeling method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve the problem that the forming accuracy of parts cannot meet the requirements, etc.

Active Publication Date: 2013-03-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to avoid the deficiencies of the existing technology, the present invention proposes a modeling method of a two-dimensional variable curvature profile part process model to solve the problem that the forming accuracy of the part cannot meet the requirements caused by the springback of the profile stretch bending unloading

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  • Modeling method for two-dimensional variable-curvature process model of section bar part
  • Modeling method for two-dimensional variable-curvature process model of section bar part
  • Modeling method for two-dimensional variable-curvature process model of section bar part

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Embodiment Construction

[0048] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0049] by figure 2 Take the part shown as an example, which is a variable curvature, asymmetrical L-shaped section profile part, and design the process model of the part. Combined with the accompanying drawings, the specific implementation process of process model definition is described.

[0050] 1. Extract the inner contour line C of the part, the length of the contour line l=665, and the two endpoints of the contour line C are respectively P Start and P End , the highest point P of the contour line Top is the contour line C up to the straight line The point with the greatest distance, P Top Divide the contour line C into two segments C 1 , C 2 , with length l 1 =330, l 2 =335 as image 3 , 4 shown.

[0051] 2. Take Δl=5mm, for l 1 and l 2 Discrete, the discrete points are P 11 ,...,P 1(67) and P 2i ,...,P 2(68) Such as Figure 5 shown....

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Abstract

The invention belongs to the technical field of aircraft manufacturing and relates to a modeling method for a two-dimensional variable-curvature process model of a section bar part. Through dispersing a contour line, the contour line is dispersed into a plurality of line segments and arc segments. By adopting finite element simulation, the recurrent magnitude of every dispersed segment is calculated; a compensated part contour curve is obtained through multiple iteration compensation; and the part contour curve is used for defining the process model of the part. The modeling method for the two-dimensional variable-curvature process model of the section bar part has the beneficial effects the process model of the section bar part can be rapidly and accurately designed, and a design used for a stretch bending mould is provided to craft personnel.

Description

technical field [0001] The invention belongs to the technical field of aircraft manufacturing, and relates to a modeling method of a process model of a two-dimensional variable-curvature profile part, which is applied to the process model design of a two-dimensional variable-curvature profile part, and uses the process model as a basis for designing and manufacturing a stretch bending die. Background technique [0002] Profile parts are the main structural parts that make up the aircraft skeleton, and are often used for frame ribs and fuselage stringers. The profile of profile parts is complex, generally asymmetric and variable curvature. The invention mainly aims at asymmetrical and variable curvature two-dimensional profile parts to complete the definition of the process model. [0003] Profile parts, as the main structural parts of the aircraft skeleton, directly affect the shape accuracy and structural bearing capacity of the aircraft, and its manufacture has become an ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 雷湘衡王俊彪刘闯杨忆湄谭浩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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