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Unfolding plate blank for bent and twisted stringer

A long truss, bending and torsion technology, applied in the field of aircraft digital manufacturing, can solve the problems of unsuitable processing accuracy, high manual operation intensity, and a large number of tooling, so as to achieve the effect of improving molding consistency, improving processing efficiency, and saving tooling

Inactive Publication Date: 2015-09-09
XIAN AIRCRAFT BRANCH OF XIAN AIRCRAFT INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an unfolded slab for bending and torsion long stringers CNC machining, which is used for the first stretching and then bending processing of the bending and torsion stringers, which can overcome the need for a large number of tooling and manual operation of the traditional "mold milling" processing method , long period, and the defects that the processing accuracy is not suitable for guarantee

Method used

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  • Unfolding plate blank for bent and twisted stringer
  • Unfolding plate blank for bent and twisted stringer
  • Unfolding plate blank for bent and twisted stringer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] figure 1 It is a schematic design digital model of a curved and twisted long truss of an aircraft, including the upper web 1, the lower web 2, the vertical rib 3 connecting the upper and lower webs, and the reference line 4. The cumulative twist angle of vertical rib 3 along the direction of reference line 4 is 13.32°, and reference line 4 is a spatial curve.

[0020] figure 2 The unfolded slab of the twisted stringer shown is given by figure 1 The shown bending and torsion truss design digital model is obtained by straightening and unfolding, corresponding to the upper web 1', the lower web 2', the vertical rib connecting the upper and lower webs 3' and the datum line 4'. The special point is that the datum line 4' is a straight line segment, and its length is equal to the datum line 4 length of the digital model of bending and torsion truss design. Such as image 3 , 4 As shown, the normal section 6' at any point 5' on the datum line 4' is the same as the normal...

Embodiment 2

[0023] Such as Figure 5 The digital model of the bent-torsion long truss design shown includes the upper web 1, the lower web 2, the vertical rib 3 connecting the upper and lower webs, and the datum line 4. The cumulative twist angle of the vertical rib 3 along the direction of the reference line 4 is 5.47°, the reference line 4 is a spatial curve, and there is a folding point 7 on the reference line 4.

[0024] Figure 6 The unfolded slab of the bent and twisted stringer with kinks shown is given by Figure 5 The shown curved and twisted long truss design with inflection point is obtained by straightening and unfolding, corresponding to the upper web 1', the lower web 2', the vertical rib connecting the upper and lower webs 3', the datum line 4' and the inflection point 7 '. The datum line 4' is a broken line composed of two straight line segments, and the included angle a' at the inflection point 11' is equal to the tangent angle a of the datum line 4 at the inflection p...

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Abstract

The invention provides an unfolding plate blank for a bent and twisted stringer. The unfolding plate blank is obtained through straightening and unfolding a design digital model of the bent and twisted stringer, and comprises an upper web plate, a lower web plate and vertical bars, wherein the vertical bars are used for connecting the upper web plate and the lower web plate; a crossing line of a vertical bar reference surface and a lower web plate reference surface is a reference line for the unfolding plate blank; the reference line is a straight line section; the length of the reference line is identical to the length of the reference line of the design digital model of the bent and twisted stringer; the normal section of the upper web plate, the lower web plate and the vertical bras in any position on the reference line is identical to the normal section of the upper web plate, the lower web plate and the vertical bars in a position, corresponding to the reference line, in the design digital model of the bent and twisted stringer; and the vertical bar reference surface of the unfolding plate blank is a plane.

Description

technical field [0001] The invention belongs to the field of aircraft digital manufacturing, and in particular relates to an unfolded slab processed by numerical control processing of bent and torsion long stringers. Background technique [0002] As a key component for carrying aircraft lift and inertial loads, the stringer is directly or indirectly assembled with the skin in the aircraft structure, so its structure often bends or even twists with the skin. This type of stringer is called a twisted stringer. The traditional "mold milling" processing method of bent and twisted long trusses is based on the transfer of analog quantities. First, each profile is manually processed according to the template, and then the characteristic contour is processed by general milling, and then bent and twisted to complete the long truss parts manufacture. The disadvantage of this method is that a large number of tooling is required, the manual operation is intensive, the cycle is long, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C1/06
Inventor 党建卫陈金平王俊蓉武杰韩强儒赵平
Owner XIAN AIRCRAFT BRANCH OF XIAN AIRCRAFT INT
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