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A method for arranging reference holes

A reference hole and measurement reference technology, which is applied in the direction of instruments, measuring devices, aircraft assembly, etc., can solve the problems of inability to accurately reflect the assembly state of parts and high measurement complexity, so as to reduce the measurement complexity, improve the accuracy of the hole position, The effect of reducing the number

Active Publication Date: 2021-06-08
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings that the existing reference hole arrangement method cannot accurately reflect the assembly state of the part or the measurement complexity is high, a general reference hole arrangement method based on the deformation of the part is proposed

Method used

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  • A method for arranging reference holes
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  • A method for arranging reference holes

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Experimental program
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Effect test

Embodiment 1

[0027] like figure 1 As shown, when the measured maximum deformation of the part is , the hole position error assigned to the hole position correction link through the tolerance is , then when the deformation of the part is small, satisfying When , it is considered that the hole position accuracy at the position with the largest deformation can still meet the hole-making requirements. At this time, the influence of the deformation of the part itself on the hole-making hole position accuracy is not considered, and only the influence of the assembly position of the part on the hole-making hole position accuracy is considered. Therefore, it is only necessary to arrange datum holes at both ends of the part.

Embodiment 2

[0029] When the deformation of the part is large and meets the requirement, if the deformation of the part is large in the local area of ​​the part, if the influence of the deformation of the part is not considered, the hole position made by automatic hole making will not meet the hole position accuracy requirements. At this time, it is first necessary to arrange reference holes at both ends of the part to measure the assembly position of the part, and secondly arrange reference holes between the reference holes at both ends for measuring the deformation of the part, the number of which is:

[0030] ;[] stands for rounding

[0031] After this arrangement, no need to consider the deformation of the part between any two deformation reference holes, it can also meet the accuracy requirements of the hole making hole, and achieve the purpose of using a small number of reference holes to reflect the assembly deformation of the part, such as figure 2 shown.

Embodiment 3

[0033] like image 3 As shown, in a digital assembly system, a laser tracker is used to measure the position of the reference hole. The product requires the accuracy of the hole position to be ±0.6mm, of which the accuracy of the reference hole itself is ±0.2mm, the measurement accuracy of the laser tracker is ±0.05mm, and the accuracy assigned to the hole position correction link is ±0.35mm . After using the laser tracker to sample and fit the part shape at multiple points, the maximum deformation of a certain upper girder is 0.2mm, and the maximum deformation of a certain sheet metal frame is 0.9mm.

[0034] For the upper girder, due to , it is only necessary to arrange the assembly position measurement reference holes at both ends of the part.

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Abstract

The steps of the method for arranging reference holes disclosed by the invention are as follows: S1 uses a measuring instrument to measure the deformation of assembled segmented parts, and S2 divides the reference holes into two categories: 1) The reference holes for measuring the assembly position of the parts are used for feedback The actual assembly position of the part; 2) The reference hole for part deformation measurement is used to feed back the deformation of the part; S3 arranges the reference holes on the part according to the error assigned to the hole position correction link: when the measured maximum deformation of the part is , the hole position error assigned to the hole position correction link through the tolerance is , then when the deformation of the part is small and satisfied, only the reference holes are arranged at both ends of the part; when it is satisfied, the reference holes are arranged at both ends of the part, and at Datum holes for measuring part deformation are arranged between the datum holes at both ends. The beneficial effect of the patent of the present invention is that it can accurately reflect the actual assembly situation of the parts to the automatic hole-making system, improve the accuracy of the hole-making holes, ensure that the corrected hole-making holes meet the accuracy requirements, and effectively reduce the number of reference holes. Reduce the complexity of reference hole measurement and improve production efficiency.

Description

technical field [0001] The invention relates to a new method for arranging reference holes on parts for correcting automatic hole positions in the process of automatic hole making. Background technique [0002] In order to meet the high-quality and high-efficiency hole-making requirements of modern aircraft, automatic hole-making technology has been gradually applied in the assembly of aircraft skin panels and aircraft components. Because there are errors in the manufacturing, positioning and assembly of aircraft structural parts, there is often a certain deviation between the assembled product and the theoretical digital model. At this time, if the automatic hole making system directly makes holes according to the theoretical hole positions, actual holes will inevitably appear. There is a large deviation between the hole position and the theoretical hole position, so the actual hole position needs to be corrected. The measurement system before automatic hole making compare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/32B64F5/10
CPCB64F5/10G01B21/32
Inventor 付建超何凤涛樊西锋张在学谭明维彭志军薛松郭喜锋谢明伟
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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