Optics and Precision Engineering, Volume. 33, Issue 6, 862(2025)
A measurement method for the internal thread parameters of drill pipe joints based on spectral confocal principle
Figures & Tables(17)
Fig. 3. Structure of measurement system for internal thread parameters
Fig. 4. Actual position of thread axis， rotating table axis and light path
Fig. 6. Axis of the taper thread is not coaxial with the axis of the rotating table
Fig. 7. Axis of the taper thread is coaxial with the axis of the rotating table
Fig. 8. Measurement system for internal thread parameters and integrated with automatic production line
Fig. 12. Comparison of thread profile curves before and after compensation
Table 1. Data of 2 7/8 REG thread parameter measured by the measurement system before and after compensation.
View tableView in ArticleTable 1. Data of 2 7/8 REG thread parameter measured by the measurement system before and after compensation.
P/mm h/mm α1/（°） α2 /（°） D1/mm D2/mm D3/mm 补偿前 5.078 2.938 7.211 29.701 30.317 57.014 53.776 51.14 补偿后 5.078 2.939 7.215 29.716 30.334 57.021 53.786 51.143 标准值 5.079 2.942 7.226 29.735 30.349 57.036 53.798 51.152 公差 5.08±0.07 30.0±0.5 30.0±0.5 57.02±0.063 53.76±0.063 51.13±0.063 补偿率 0 25.0% 26.7% 44.1% 53.1% 31.8% 45.4% 25.0%
Table 2. Data from ten measurements of the 2 7/8 REG thread profile using the measurement system
View tableView in ArticleTable 2. Data from ten measurements of the 2 7/8 REG thread profile using the measurement system
P/mm h/mm α1/ （°） α2/ （°） D1/mm D2/mm D3/mm 第一次测量 5.077 2.940 7.214 29.725 30.309 57.021 53.783 51.141 第二次测量 5.078 2.9385 7.216 29.707 30.329 57.02 53.785 51.143 第三次测量 5.079 2.938 7.211 29.709 30.351 57.021 53.786 51.145 第四次测量 5.078 2.939 7.219 29.712 30.330 57.020 53.784 51.142 第五次测量 5.078 2.941 7.218 29.723 30.338 57.022 53.785 51.141 第六次测量 5.077 2.940 7.217 29.731 30.341 57.021 53.788 51.142 第七次测量 5.078 2.938 7.215 29.707 30.324 57.020 53.787 51.144 第八次测量 5.079 2.940 7.213 29.714 30.353 57.023 53.785 51.143 第九次测量 5.078 2.938 7.217 29.721 30.342 57.019 53.790 51.143 第十次测量 5.078 2.939 7.214 29.707 30.327 57.02 53.785 51.142 重复测量精度 0.002 0.0025 0.008 0.024 0.044 0.004 0.007 0.004
Table 3. Comparison of the data of 2 7/8 REG thread measured by three thread measurement methods
View tableView in ArticleTable 3. Comparison of the data of 2 7/8 REG thread measured by three thread measurement methods
P /mm h/mm α1/ （°） α2 /（°） D1/mm D2/mm D3/mm 螺纹测量机 5.079 2.942 7.226 29.735 30.389 57.032 53.798 51.152 单项测量仪 5.07 2.90 7.20 / / / / 51.14 自研测量系统 5.078 2.939 7.215 29.716 30.334 57.021 53.786 51.143 测量误差 -0.001 -0.003 0.011 0.019 -0.045 0.011 0.012 0.009
Table 4. Precision analysis of thread measurement system
View tableView in ArticleTable 4. Precision analysis of thread measurement system
误差项 误差值/μm 径向测量反应值/μm 服从分布 包含
因子
标准不确定度
分量ui/μm
机械系统误差 主轴轴向跳动 18 δ1-i 4.5 正态分布 3 1.5 X轴跳动 6 1.5 正态分布 3 0.5 Z轴跳动 6 6 正态分布 3 2 二维平移台重复定位精度 3 3 正态分布 3 1 标准量误差 光栅尺系统精度 0.5 δ2-i 0.5 均匀分布 0.29 1.88 1.88 均匀分布 1.08 数据处理误差 0.1 δ3 0.1 均匀分布 0.06 基面D2测量重复性 / δ4 0.56
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Yanyu CHEN, Dongzhuang TIAN, Pei JU. A measurement method for the internal thread parameters of drill pipe joints based on spectral confocal principle[J]. Optics and Precision Engineering, 2025, 33(6): 862
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Received: Dec. 14, 2024
Accepted: --
Published Online: Jun. 16, 2025
The Author Email: Dongzhuang TIAN (tiandongzhuang@cctegxian.com)
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