Method for measuring surface profile of honeycomb core

A measurement method and surface profile technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve problems such as unspecified methods

Active Publication Date: 2019-11-22
DALIAN UNIV OF TECH
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Problems solved by technology

Although it gives the method of determining the rotation matrix in the coordinate transformation from these three error angles, it does not give the method of determining the three error angles

Method used

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  • Method for measuring surface profile of honeycomb core
  • Method for measuring surface profile of honeycomb core
  • Method for measuring surface profile of honeycomb core

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Experimental program
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Effect test

Embodiment 1

[0153] 1. Measurement platform construction

[0154] The laser displacement sensor selected in this embodiment is an ultra-high-speed profile measuring instrument (LJ-V7060) of Keyence Corporation. The measuring instrument adopts blue semiconductor laser, which can realize stable and ultra-high-speed measurement, the sampling interval can reach 16μs, the repeated measurement accuracy in the Z-axis direction can reach 0.4μm, the measurement contour data interval is 20μm, and the measured laser line length is 15mm. During the measurement, the probe of the profile measuring instrument is installed on the three-axis CNC machine tool, the standard part to be measured is fixed on the machine table, and the movement of the probe of the profile measuring instrument is controlled by the machine tool to scan the surface of the standard part.

[0155] The measured honeycomb core is a honeycomb core with hexagonal structural units.

[0156] 2. Installation error calibration of line laser...

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Abstract

The invention discloses a method for measuring the surface profile of a honeycomb core, which comprises the steps of scanning the honeycomb core according to a specified path; respectively calculatingan installation error angle [alpha]Z of a linear laser measuring head around the Z-axis, an installation error angle [alpha]y of the linear laser measuring head around the Y-axis and an installationerror angle [alpha]x of the linear laser measuring head around the X-axis by using the scanned profile data; driving a sensor to scan the surface of the honeycomb core to be measured according to thespecified path by a numerically-controlled machine tool; unifying the measured data measured under a linear laser coordinate system to a global coordinate system through coordinate transformation according to the installation error angles and the operation coordinates of the measuring head; and splicing the honeycomb data measured under each path to obtain the surface data of the whole honeycomb core to be measured. The method effectively solves the problem that it is difficult to determine the installation error angle of the linear laser. The method has the advantages of convenient operation,high precision, high adaptability and low cost, and can meet the measurement requirements of the actually processed honeycomb core surface.

Description

technical field [0001] The invention relates to the technical field of line laser measurement, in particular to a method for measuring the surface profile of a honeycomb core. Background technique [0002] Honeycomb core is a low-density honeycomb material, which is widely used in aerospace, high-speed trains and other fields because of its high specific strength, specific stiffness and other high-quality properties. However, due to its thin wall and weak rigidity, there is no effective means for high-precision measurement of its machined surface shape accuracy. [0003] The invention patents with application numbers 201610585321.1 and 201610585419.7 disclose a method for measuring the surface shape of honeycomb cores. A thin film is coated on the surface of the workpiece to be measured, and the film is adsorbed and pressed on the surface of the honeycomb core with a certain degree of vacuum. Sensors measure the surface of the film, which further extracts the shape of the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 康仁科董志刚秦炎鲍岩朱祥龙
Owner DALIAN UNIV OF TECH
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