Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (12): 3358-3366.doi: 10.13229/j.cnki.jdxbgxb.20220050

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Flatness error measurement method based on line structured light vision

Si-yuan LIU1(),Yue-qian HOU2,Ying KOU1(),Zhen REN2,Zheng-yi HU3,4,Xue-wei ZHAO2,Yu-peng GE1   

  1. 1.School of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
    2.School of Mechanical Engineering，Changchun University，Changchun 130022，China
    3.School of Mechanical and Automotive Engineering，South China University of Technology，Guangzhou 510641，China
    4.Production and Education Integration Development Center，Changchun Automobile Industry College，Changchun 130010，China
  • Received:2022-01-11 Online:2023-12-01 Published:2024-01-12
  • Contact: Ying KOU E-mail:liusiy@jlu.edu.cn;kouy@jlu.edu.cn

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Abstract:

Flatness is an important shape deviation. A flatness error measurement method was proposed based on line structured light vision technology for flatness measurement in the field of mechanical component manufacturing and processing. Firstly， the images of light strips were collected， and the spatial coordinates of the scanning points were obtained by the corresponding light plane equation for each position. Secondly， the evaluation methods for flatness errors in national standards was analyzed and a measurement algorithm for flatness errors was established based on geometric constraints. Finally， through the proposed method， the evaluation base plane and flatness errors were calculated using the spatial coordinates of the scanning points. In the experiment， the positioning surfaces of the insert molds are selected as the measured planes， and the measurement results obtained by visual measurement are compared with those obtained by the contact measurement method. The measurement error is less than 20 μm. The experimental results show that the measurement method proposed is feasible and improves the measurement efficiency of flatness error.

Key words: machine vision, flatness, line structured light vision, tolerance measurement

CLC Number: 

  • TH164

Fig.1

Calibration model of the light plane of the line structured light"

Fig.2

Flatness measurement model based on least squares"

Fig.3

Solution model for evaluating the initial value of the base surface"

Fig.4

Tested insert molds"

Fig.5

Flatness measurement experiment"

Table 1

Model and parameters of experimental equipment"

实验设备型号主要参数
计算机联想R5000处理器：AMD R4800u
摄像机恒大水星系列-125-30UM分辨率：1292×964 像素
镜头Computer M2514-MP焦距：25 mm
线激光器LH650-80-3功率：0~20 mW；波长：650 nm
平行辅助光源CCS LFL-200最大亮度：800尼特
标定板NANO CBC 25mm-2.0精度：±1.0 μm

Fig.6

Scanned images of the measured plane （mold 1）"

Fig.7

Scanned images of the measured plane （mold 2）"

Table 2

Calibration results of the light plane at each position of mold 1"

位置编号光平面方程
19.1927XC-0.01465YC+2.8465ZC-1000=0
29.1902XC-0.01465YC+2.846ZC-1000=0
39.3838XC-0.01530YC+2.915ZC-1000=0
49.6735XC-0.01456YC+3.116ZC-1000=0
59.889XC-0.01589YC+3.270ZC-1000=0
610.2258XC-0.017808YC+3.369ZC-1000=0
710.4496XC-0.01926YC+3.463ZC-1000=0
810.6854XC-0.01998YC+3.474ZC-1000=0
910.9072XC-0.01804YC+3.587ZC-1000=0
1011.107XC-0.01869YC+3.574ZC-1000=0

Table 3

Calibration results of light plane at each position of mold 2"

位置编号光平面方程
18.0042XC-0.01546YC+2.897ZC-1000=0
28.1717XC-0.01464YC+2.933ZC-1000=0
38.3115XC-0.01380YC+3.005ZC-1000=0
48.521XC-0.01560YC+3.071ZC-1000=0
58.6764XC-0.01696YC+3.089ZC-1000=0
68.9311XC-0.01617YC+3.209ZC-1000=0
79.1270XC-0.01544YC+3.293ZC-1000=0
89.4170XC-0.01576YC+3.355ZC-1000=0
99.6412XC-0.01472YC+3.386ZC-1000=0
109.8509XC-0.01873YC+3.446ZC-1000=0

Fig.8

Solve and evaluate the images of the initial value of the base surface and the position of the center point of the light strip （mold 1）"

Table 4

Space equation of the optimized initial value of the evaluation base level and the space equation of intersecting plane"

光平面方程
位置1（模具1）2.1456XC+0.2233YC+1.8771ZC-1000=0
位置2（模具1）2.1650XC-0.1990YC+2.0237ZC-1000=0
评定基面（模具1）-0.0316XC+0.09YC-ZC+529.661=0
位置1（模具2）2.1607XC-0.2245YC+1.8694ZC-1000=0
位置2（模具2）2.1925XC+0.2151YC+2.0707ZC-1000=0
评定基面（模具2）-0.0258XC+0.0898YC-ZC+531.6321=0

Table 5

Measurement result of flatness error of mold positioning surface"

接触式方法1误差方法2误差方法3误差
模具10.0080.0130.0050.0250.0170.0190.011
模具20.0070.0150.0080.0200.0130.0170.010
均值-0.0140.0070.0230.0150.0180.011

Table 6

Measurement time of flatness error of mold positioning surface"

几何约束法最小二乘法最小包容法
均值1.6940.8750.625
模具11.6530.8760.635
模具21.7350.8730.615

Fig.9

Scanned images of the measured plane after adding noise （mold 1）"

Fig.10

Scanned images of the measured plane after adding noise （mold 2）"

Table 7

Measurement result of flatness error of mold positioning surface after increasing noise"

接触式方法1（误差）方法2（误差）方法3（误差）
均值-0.026（0.018）0.033（0.025）0.035（0.026）
模具10.0080.025（0.017）0.035（0.027）0.034（0.026）
模具20.0070.026（0.019）0.030（0.023）0.035（0.026）
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