Measurement method of hot forging dimension based on green laser depth information

Yu-Cun Zhang; Lin Qian; Tao Kong; Qun Li

doi:10.1364/AO.507094

Applied Optics
Vol. 63,
Issue 2,
pp. 483-491
(2024)
•https://doi.org/10.1364/AO.507094

Measurement method of hot forging dimension based on green laser depth information

Yu-Cun Zhang, Lin Qian, Tao Kong, and Qun Li

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Yu-Cun Zhang, Lin Qian, Tao Kong, and Qun Li, "Measurement method of hot forging dimension based on green laser depth information," Appl. Opt. 63, 483-491 (2024)

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Abstract

The application field of large forgings is extensive. Accurate dimensional measurement is an important factor to ensure the quality of the finished forging product when it is forged at high temperature. Therefore, this paper proposes a green laser scanning measurement method based on depth information. First, a geometric measurement model based on depth information is established by studying the relationship between green laser depth information and forging dimension. Then, based on the heat transfer theory, distribution of the temperature field around hot forgings is studied, and an error function caused by light refraction is established using a ray tracing algorithm. After that, the error function is used to modify the measurement model to obtain the accurate distance between the forging and background plane and then obtain the dimensional information of the forging. Finally, this measurement method was experimentally verified in the laboratory, and the experimental results show that the measurement error of this method meets the dimensional measurement requirements of large hot forgings.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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No.	Actual Length/mm	Displacement Distance $S / m m$	Left Edge Distance $l_{1} / m m$	Right Edge Distance $l_{2} / m m$	Measurement Length/mm	Error mm
1	403.90	401.40	3782.54	3842.94	405.92	2.02
2		401.39	3789.04	3840.54	404.69	0.80
3		401.39	3784.24	3850.34	406.80	2.90
4		401.41	3783.24	3843.24	405.87	1.97
5		401.40	3792.54	3844.14	404.70	0.80
6		401.41	3783.44	3840.54	405.44	1.54
7		401.40	3793.74	3851.34	405.51	1.61
8		401.39	3787.34	3839.84	404.81	0.91
9		401.40	3784.54	3844.44	405.84	1.94
10		401.40	3784.04	3842.94	405.69	1.79

No.	Actual Length/mm	Displacement Distance $S / m m$	Left Edge Distance $l_{1} / m m$	Right Edge Distance $l_{2} / m m$	Measurement Length/mm	Error/mm
1	404.10	401.52	3785.94	3846.54	406.06	1.96
2		401.50	3781.04	3848.64	405.43	1.33
3		401.52	3779.84	3833.24	405.01	0.91
4		401.51	3780.84	3846.54	405.05	0.95
5		401.53	3781.94	3837.04	405.28	1.18
6	803.32	801.82	3784.64	3848.64	804.37	1.05
7		801.82	3781.44	3844.04	804.26	0.94
8		801.81	3779.44	3845.14	804.51	1.19
9		801.82	3776.24	3850.64	805.26	1.94
10		801.83	3780.74	3849.44	804.75	1.43

No.	Actual Length/mm	Displacement Distance $S / m m$	Left Edge Distance $l_{1} / m m$	Right Edge Distance $l_{2} / m m$	Measurement Length/mm	Error mm
1	403.90	401.40	3782.54	3842.94	405.92	2.02
2		401.39	3789.04	3840.54	404.69	0.80
3		401.39	3784.24	3850.34	406.80	2.90
4		401.41	3783.24	3843.24	405.87	1.97
5		401.40	3792.54	3844.14	404.70	0.80
6		401.41	3783.44	3840.54	405.44	1.54
7		401.40	3793.74	3851.34	405.51	1.61
8		401.39	3787.34	3839.84	404.81	0.91
9		401.40	3784.54	3844.44	405.84	1.94
10		401.40	3784.04	3842.94	405.69	1.79

No.	Actual Length/mm	Displacement Distance $S / m m$	Left Edge Distance $l_{1} / m m$	Right Edge Distance $l_{2} / m m$	Measurement Length/mm	Error/mm
1	404.10	401.52	3785.94	3846.54	406.06	1.96
2		401.50	3781.04	3848.64	405.43	1.33
3		401.52	3779.84	3833.24	405.01	0.91
4		401.51	3780.84	3846.54	405.05	0.95
5		401.53	3781.94	3837.04	405.28	1.18
6	803.32	801.82	3784.64	3848.64	804.37	1.05
7		801.82	3781.44	3844.04	804.26	0.94
8		801.81	3779.44	3845.14	804.51	1.19
9		801.82	3776.24	3850.64	805.26	1.94
10		801.83	3780.74	3849.44	804.75	1.43

Abstract

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Figures (18)

Tables (2)

Equations (26)

Applied Optics