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Unfolding method for complex flange of frame rib sheet metal part

A sheet metal part and frame rib technology, which is applied in the field of complex flanging and unfolding of frame rib sheet metal parts, can solve the problems of high bending complexity, long cycle and large allowance of frame rib sheet metal parts.

Active Publication Date: 2013-04-03
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

[0004] For a long time, the expansion of the flange of frame-rib parts has been based on manual calculation or based on experience. The margin is large, and the excess must be cut off after forming. For some complex frame-rib parts, the sheet metal manufacturing workshop adopts trial and error. Fabrication of unfolding templates by method, long period, low efficiency and high cost
With the application of digital manufacturing technology, the traditional unfolding technology has been difficult to meet the requirements of modern aircraft development. In addition, my country's aviation industry is changing with each passing day, and the performance requirements of new types of aircraft are becoming more and more stringent. The shape of the parts designed is becoming more and more complex. , the complexity of the bending of frame and rib sheet metal parts is getting higher and higher. In order to shorten the cycle from design to manufacture and improve the accuracy of part development, there is an urgent need for an expansion method suitable for complex bending

Method used

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  • Unfolding method for complex flange of frame rib sheet metal part
  • Unfolding method for complex flange of frame rib sheet metal part
  • Unfolding method for complex flange of frame rib sheet metal part

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Embodiment Construction

[0031] by figure 1 Take the complex bending of the aircraft frame rib sheet metal parts shown as an example. The bending has the characteristics of variable bending line curvature, variable bending angle, variable bending height, and uneven boundaries. Combined with the accompanying drawings, the specific implementation process of the complex flange expansion method for aircraft frame rib sheet metal parts is described as follows.

[0032] 1. The material thickness of this frame rib part is δ=2mm, extract the inner surface F of the flange adjacent to the inner surface W of the web, and F consists of two bending areas B 1 , B 2 with 1 subsidence zone J 1 composition (such as figure 2 shown).

[0033] 2. Bending area B 1 The transition line with the web surface W is length Will B 1 Divide into fillets and flange face Carry out discrete segmentation, expansion value calculation, and expansion point fitting respectively (such as image 3 shown), and end treatment i...

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Abstract

The invention relates to an unfolding method for a complex flange of a frame rib sheet metal part and belongs to the technical field of aircraft manufacturing. A digital manufacturing technology is adopted for dividing the flange of the frame rib sheet metal part into a bent area and a sunken area, respectively unfolding and then jointing and shearing, so that an unfolded outline of the flange is obtained. The unfolding problem of the frame rib sheet metal part with the complex flange is solved.

Description

1. Technical field [0001] The invention relates to a complex bending edge unfolding method of a frame-rib sheet metal part, which belongs to the technical field of aircraft manufacturing. 2. Background technology [0002] Frame-rib sheet metal parts are important components in the aircraft body skeleton, accounting for a large proportion of aviation sheet metal parts, and are responsible for the dual tasks of determining the shape of the aircraft and bearing aerodynamic loads, such as bulkheads and wing ribs. The structural characteristics of frame-rib sheet metal parts are reflected in the combination of web, flange and various structural elements. The web of the part is flat or slightly curved, with shallow flanges around it, and there are often depressions on the flanges. , the flange structure is the most important and complex part of the frame-rib sheet metal parts. Part instances such as figure 1 shown. [0003] The essence of the problem of part expansion is the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D53/92
Inventor 谭浩王俊彪刘闯杨忆湄雷湘衡
Owner NORTHWESTERN POLYTECHNICAL UNIV
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