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Large-size plate forming online measurement system and method based on machine vision

A sheet metal forming and measuring system technology, used in measuring devices, instruments, optical devices, etc., can solve the problems of good software algorithm robustness, small measurement range, low efficiency, etc., to improve measurement accuracy, fast running speed, The effect of increasing the measuring range

Pending Publication Date: 2020-09-01
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system hardware of the present invention is stable and reliable, and the robustness of the software algorithm is good, which can solve the shortcomings of the current measurement method such as small measurement range, large error and low efficiency, and has good practicability

Method used

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  • Large-size plate forming online measurement system and method based on machine vision
  • Large-size plate forming online measurement system and method based on machine vision
  • Large-size plate forming online measurement system and method based on machine vision

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Comparison scheme
Effect test

Embodiment 1

[0047] A machine vision-based online measurement system and method for large-size sheet metal forming of the present invention, such as figure 1 As shown, it includes slide rails, side supports, beams, sensor brackets, three-dimensional displacement sensors, motion control systems, industrial computers and steel plate workpieces to be tested.

[0048] When measuring, the steel plate workpiece to be tested is placed under the three-dimensional displacement sensor, and the maximum width measurement of 2500mm can be realized through the splicing of the X-direction measurement data of multiple sensors, and the maximum 12000mm can be realized through the movement of the side support and the beam in the Y direction. For length measurement, the maximum height measured by the sensor is 725mm, and direct sunlight should be avoided during the measurement process.

[0049] Due to the large size of the workpiece to be measured, the present invention adopts the method of moving the camera ...

Embodiment 2

[0059] The large-size plate forming online measurement method in this embodiment includes a laser interferometer-based three-dimensional displacement sensor calibration algorithm, a three-dimensional point cloud data splicing algorithm, a three-dimensional point cloud data preprocessing algorithm, a three-dimensional point cloud data segmentation algorithm, model reconstruction and Surface fitting.

[0060] The algorithm for calibrating the three-dimensional displacement sensor based on the laser interferometer is specifically: the industrial computer drives the stepper motor to move through the motion control card, the stepper motor controls the movement of the baffle through the corresponding transmission mechanism, and the laser interferometer and the three-dimensional displacement sensor simultaneously collect The moving distance of the baffle, the data measured by the laser interferometer are used as the standard input of the calibration system, the data measured by the th...

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Abstract

The invention discloses a large-size plate forming online measurement system and method based on machine vision, and belongs to the technical field of non-contact measurement. The large-size plate forming on-line measuring system comprises a sliding rail, a side support, a cross beam, a sensor support, a three-dimensional displacement sensor, a motion control system and an industrial personal computer. The method comprises a three-dimensional displacement sensor calibration algorithm based on a laser interferometer, a three-dimensional point cloud data splicing algorithm, a three-dimensional point cloud data preprocessing algorithm, a three-dimensional point cloud data segmentation algorithm, model reconstruction and curved surface fitting. According to the invention, a three-dimensional point cloud data splicing mode is adopted to realize measurement of a large-size plate, and the measurement range of the measurement system is increased on the premise of ensuring high precision.

Description

technical field [0001] The invention designs a machine vision-based online measurement system and method for large-size plate forming, which belongs to the field of non-contact measurement technology. Background technique [0002] In recent years, with the development of my country's mechanical processing industry, the machining accuracy of large mechanical parts has been continuously improved, so the demand for high-precision measurement of large-sized workpieces is also increasing, mainly involving aerospace, metallurgical equipment, shipbuilding industry, automobile manufacturing , prospecting equipment and many other industrial fields. The traditional measurement method generally adopts the point-by-point measurement method, which has low measurement accuracy and low efficiency, and cannot meet the actual measurement requirements. [0003] Machine vision mainly uses modules such as computers and camera modules to simulate human visual functions, extracts information from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/24G01B11/2441
Inventor 撒莹莹刘丰王明钊戎文娟
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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