| 机器视觉螺纹测量的误差分析 |
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| 引用本文： | 陈曼龙.机器视觉螺纹测量的误差分析[J].激光技术,2014,38(1):109-113. |
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| 作者姓名： | 陈曼龙 |
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| 作者单位： | 1.陕西理工学院 机械工程学院, 汉中 723003 |
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| 基金项目： | 陕西省教育厅计划资助项目（12JK0666） |
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| 摘 要： | 为了提高机器视觉方法测量螺纹的精度，采用理论分析和实验验证的方法，研究了用垂直投影测量和切向投影测量方法进行螺纹测量时发生的延伸螺旋面投影遮挡问题。在介绍垂直投影测量和切向投影测量方法的基础上，解释了垂直投影测量和切向投影测量方法产生原理误差的原因。通过对遮挡误差和不同螺旋升角误差对螺纹牙形角测量影响情况的理论分析和推导，给出了垂直投影测量时延伸螺旋面遮挡和不同螺旋升角影响的误差计算式，并进行了实例验证和分析。结果表明，对导程较大的螺纹按垂直投影法测量时，由延伸螺旋面遮挡造成的牙形角测量误差可达到1°以上。这一结果对牙形角测量而言是不容忽视的。
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| 关 键 词： | 测量与计量 机器视觉 误差分析 螺纹测量 垂直投影测量 切向投影测量 |
| 收稿时间： | 2013-03-11 |
| 修稿时间： | 2013-04-27 |
Error analysis of thread measurement with machine vision |
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| Abstract: | In order to improve measuring precision of thread based on machine vision, tangential and vertical projection measuring methods were discussed in theory, and verified experimentally, mainly related to the matter of extending helicoidal surface shade error when measuring thread profile with both the methods. After introducing the tangential and vertical projection measurement methods, the error sources were analyzed which cause principle error in measuring thread. The shade error calculating formula was given that caused from measuring thread with vertical projection measurement, and the effect that the shade error and the error caused by different lead angle was studied in measuring thread profile experiments. The result shows that the helix angle measurement error caused by extend helicoids shade error can reached over 1°when measuring larger-size helical pitch by vertical projection measurement, it can't be ignored for helix angle measurement. |
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| Keywords: | measurement and metrology machine vision error analysis thread measurement vertical projection measurement tangential projection measurement |
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