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MBD measurement technology for a large-scale composite material high-precision difficulty part

A high-precision and difficult technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve problems such as inaccurate measurement data, deviation of measurement data, constraining design criteria, etc., and achieve high measurement accuracy and real measurement data.

Active Publication Date: 2017-05-31
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the one hand, the existing technology measures the parts in the state of vacuum adsorption, but the parts are not in the state of vacuum adsorption in actual use, so the measurement data is inaccurate; on the other hand, the three coordinates established during the measurement of the existing technology are not constrained Design basis, during the measurement process, the fitting curve will perform additional compensation, resulting in deviations in the measurement data, and the movement of parts will also cause deviations in the measured data

Method used

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  • MBD measurement technology for a large-scale composite material high-precision difficulty part
  • MBD measurement technology for a large-scale composite material high-precision difficulty part

Examples

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Effect test

Embodiment 1

[0033] This embodiment takes the front beam of an aircraft as an example to illustrate the MBD measurement process of large-scale composite high-precision and difficult parts.

[0034] Such as figure 1 As shown, the total length of the front beam of the aircraft is 10 meters. According to the ABC benchmark, a 12-meter CMM three-coordinate measuring machine is used for measurement, combined with a laser tracker, and the measurement is carried out by pressing sandbags.

[0035] Put the high-precision and difficult parts on the milling tooling, combined with the comprehensive application of laser tracker, CMM three-coordinate measuring machine, tooling and process plan formulation, measure the high-precision and difficult parts in the natural state of MBD digital simulation; When the CMM three-coordinate measuring machine establishes the coordinate system, it adopts the ABC datum of the digital model of the part, first performs the ABC datum constraint, then establishes the corre...

Embodiment 2

[0047] This embodiment takes the skin as an example to illustrate the MBD measurement process of large-scale composite high-precision and difficult parts.

[0048] The specific steps for establishing the coordinate system of the CMM three-coordinate measuring machine are as follows:

[0049]Step S201: A datum plane is fitted to the surface of the milling tooling, manually measuring 5 points on the tooling surface that fits with the A datum plane to establish a plane, and defining Z0 and Z+;

[0050] Step S202: Manually collect the center of the K hole of the B reference, and project it to a point (B') on the Z0 plane. This point is defined as the coordinate origin, and define X0; manually collect the center of the K hole of the C reference, and project it to a point (C') on the Z0 plane. , B, C datum projection point (B', C') connecting line defines X+;

[0051] Step S203: Using the defined X+, X0, Z+, and Z0, establish the right-hand measurement coordinate system M1 of the h...

Embodiment 3

[0060] This embodiment is further optimized on the basis of the above embodiments, and the parts are fixed by pressing sandbags according to the requirements of BAC5317. Specifically, it means that every about 300mm is pressed with 10 pounds of sandbags for compaction.

[0061] In this embodiment, the method of pressing sandbags is used to make the detection status of high-precision and difficult parts meet the requirements of BAC5317 "Fiber Reinforced Composite Parts" Table Ⅺ "Acceptable Deviation Standards for Completed Cured Parts" to apply 10 pounds on a 12-inch spacing positioning requirements.

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Abstract

The invention discloses MBD measurement technology for a large-scale composite material high-precision difficulty part. The high-precision difficulty part is placed on a milling tool, and measurement is carried out on the high-precision difficulty part in an MBD digital-analogue natural state in combination with comprehensive application of a laser tracker, a CMM (3D coordinate measuring machine), tools and formulation of process programs. In setting up of a coordinate system, as for the 3D coordinate measuring machine, a part digital-analog ABC reference is adopted; ABC reference constraint is first conducted; and then a corresponding coordinate system is established; and finally, measurement is carried out on calibrated measurement essential elements. The measurement method of the invention is high in efficiency and accurate in measurement data.

Description

technical field [0001] The invention relates to the field of measuring high-precision and difficult parts of large-scale composite materials, in particular, it is an MBD measurement process for high-precision and difficult parts of large-scale composite materials. Background technique [0002] For mass-produced large-scale composite high-precision and difficult parts, the parts are often milled and vacuum-adsorbed on the milling clamp, and the laser tracker is used to measure the contour and hole position with the best fitting method. [0003] On the one hand, the existing technology measures the parts in the state of vacuum adsorption, but the parts are not in the state of vacuum adsorption in actual use, so the measurement data is inaccurate; on the other hand, the three coordinates established during the measurement of the existing technology are not constrained Design basis, during the measurement process, the fitting curve will perform additional compensation, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01B11/25
CPCG01B11/2433G01B11/25
Inventor 周豫蓉陈雪梅李美琦马李波
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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