Infrared and Laser Engineering, Volume. 52, Issue 4, 20220686(2023)
Three-dimensional measurement of geometrical parameters of cutting tools based on depth from focus method
Figures & Tables(12)
Fig. 3. Tool surface sequence image. (a) Midpoint of cross blade; (b) Horizontal blade field point; (c) Point of main cutting edge
Fig. 4. Focus evaluation function curve. (a) Transverse edge midpoint; (b) Adjacent points of the transverse edge; (c) One point of the main cutting edge; (d) The first set of side sequence images; (e) The second set of side sequence images; (f) The third set of side sequence images
Fig. 8. (a) Step sequence image; (b) Ladder 3D point cloud; (c) Partial point depth on line 1
Fig. 9. 3D point cloud of tool flank. (a) Calculation results based on Tenengrad; (b) Calculation results based on improved double threshold Tenengrad
Table 1. Focus function curve evaluation index of different pixel
View tableView in ArticleTable 1. Focus function curve evaluation index of different pixel
Image pixel position Evaluation index Focusing evaluation function MIS2[ 11 ]MIS3[ 11 ]DCT1[ 11 ]GRA1[ 11 ]STA4[ 11 ]GRA6[ 11 ]Proposed method Chisel edge point R 0 3.700 4.365 1.133 8.346 8.679 11.547 S −0.005 0.304 0.326 0.300 0.332 0.329 0.333 G −0.014 0.817 0.944 0.694 0.981 0.986 0.994 N 0.820 0.196 0 0 0 0 0 Chisel edge neighboring point R 0.538 1.059 1.341 1.079 1.737 2.452 5.202 S 0.105 0.171 0.276 0.257 0.318 0.316 0.333 G 0.295 0.792 0.607 0.506 0.823 0.913 0.999 N 0.275 0.402 0 0 0 0 0 Point of cutting edge R 0 0.154 1.802 2.011 1.979 40.333 2499.611 S 0 0.009 0.204 0.037 0.235 0.319 0.333 G 0 0 0.759 0.057 0.694 0.909 0.999 N 0.778 0.472 0.298 0.714 0.229 0.756 0.172
Table 2. Experimental equipment parameter
View tableView in ArticleTable 2. Experimental equipment parameter
Equipment Parameter Value Linear motor displacement table Travel range/mm 60 Grating resolution/μm 0.1 CMOS camera Image size/μm 4.5×4.5 Pixel size 5120×5120 Microscopic lens DOF/μm 14 Magnification 5 Ring light Angle/(°) 90
Table 3. Measurement results of parameters
View tableView in ArticleTable 3. Measurement results of parameters
Methods Angle/(°) Diameter/mm ${\phi _r}$ ${\phi _w}$ ${d_r}$ ${d_w}$ This paper 111.97 85.33 2.786 6.242 Tenengrad 109.87 84.73 2.774 6.234 Commercial equipment 109.6 84.4 2.78 6.24 Measuring instrument 110.08 84.86 2.772 6.236 Error T 1.89 0.47 0.012 0.006 O 0.21 0.13 0.002 0.002 C 0.48 0.46 0.006 0.004
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Peidong Zhang, Wei Liu, Wenqi Wang, Likun Si, Yang Zhang, Mengde Zhou. Three-dimensional measurement of geometrical parameters of cutting tools based on depth from focus method[J]. Infrared and Laser Engineering, 2023, 52(4): 20220686
Paper Information
Category: Photoelectric measurement
Received: Dec. 10, 2022
Accepted: --
Published Online: Jul. 4, 2023
The Author Email: Zhang Yang (zy2018@dlut.edu.cn)
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