钻杆锥螺纹激光测量原理研究及误差分析
发布时间：2018-08-06 18:12
【摘要】：圆锥螺纹作为一种连接紧密,气密性良好的连接螺纹,其具有装配容易,能够得到过盈配合,确保良好密封效果的优点。随着其设计和加工水平的提高,对锥螺纹测量的准确度也提出了更高的要求,以往螺纹检测方式主要以螺纹规检测为主,其人工检测效率低,受人为因素影响大,专业的检测仪器由于体积的限制只能在固定地点进行测量,针对这些弊端,提出了一种便携式螺纹检测系统,对比以往的检测方法,该系统测量精度高、效率高,灵活性高,受人为因素影响小。首先,本文在总结了锥螺纹国内外测量的发展趋势以及激光测量原理的基础上,提出了非在机测量系统的设计要求,并完成了测量系统的总体结构设计,并对一些关键部件提出了不同的设计方案,通过计算受力以及变形分析,以达到优化设计的目的。本文提出了一种新型螺纹夹紧结构,采用三圆弧曲面对螺纹进行夹紧,实现快速夹紧的同时,还能保证被测件轴线的准确定位,提高了测量的准确化以及效率化。其次对锥螺纹的牙型进行了建模,运用仿真软件对其轮廓图形进行了模拟,之后基于最小二乘法提出了改进的最小二乘法理论,并通过对已有的数据进行拟合和图形重构,通过计算并将两者方法进行对比,以获得更优的数据处理方法。最后分析了测量系统的误差源,对误差的产生做了理论分析,并提出了相应的误差补偿方法,分析了影响测量准确性的因素,以实现系统的高精度测量。
[Abstract]:As a kind of connection thread with close connection and good air tightness, conical thread has the advantages of easy assembly, interference fit and good sealing effect. With the improvement of its design and processing level, the accuracy of taper thread measurement is also higher. In the past, thread gauge is the main method of thread detection, and its manual inspection efficiency is low, which is greatly influenced by human factors. Due to the limitation of volume, a portable screw thread detection system is put forward, which is more accurate, efficient and flexible than the previous testing methods. It is little influenced by human factors. Firstly, on the basis of summing up the development trend of cone thread measurement at home and abroad and the principle of laser measurement, this paper puts forward the design requirements of off-machine measurement system, and completes the overall structure design of the measurement system. Different design schemes are put forward for some key components, and the purpose of optimum design is achieved by calculating the force and the deformation analysis. In this paper, a new type of thread clamping structure is proposed, which uses tri-arc curved face thread to realize fast clamping, at the same time, it can ensure the accurate orientation of the axis of the measured parts, and improve the accuracy and efficiency of the measurement. Secondly, the tooth profile of conical thread is modeled, and its contour is simulated by simulation software. Then, an improved least square theory is proposed based on the least square method, and the existing data are fitted and reconstructed. By calculating and comparing the two methods, a better data processing method can be obtained. Finally, the error source of the measurement system is analyzed, the generation of the error is theoretically analyzed, the corresponding error compensation method is put forward, and the factors affecting the accuracy of the measurement are analyzed in order to realize the high precision measurement of the system.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG85
[Abstract]:As a kind of connection thread with close connection and good air tightness, conical thread has the advantages of easy assembly, interference fit and good sealing effect. With the improvement of its design and processing level, the accuracy of taper thread measurement is also higher. In the past, thread gauge is the main method of thread detection, and its manual inspection efficiency is low, which is greatly influenced by human factors. Due to the limitation of volume, a portable screw thread detection system is put forward, which is more accurate, efficient and flexible than the previous testing methods. It is little influenced by human factors. Firstly, on the basis of summing up the development trend of cone thread measurement at home and abroad and the principle of laser measurement, this paper puts forward the design requirements of off-machine measurement system, and completes the overall structure design of the measurement system. Different design schemes are put forward for some key components, and the purpose of optimum design is achieved by calculating the force and the deformation analysis. In this paper, a new type of thread clamping structure is proposed, which uses tri-arc curved face thread to realize fast clamping, at the same time, it can ensure the accurate orientation of the axis of the measured parts, and improve the accuracy and efficiency of the measurement. Secondly, the tooth profile of conical thread is modeled, and its contour is simulated by simulation software. Then, an improved least square theory is proposed based on the least square method, and the existing data are fitted and reconstructed. By calculating and comparing the two methods, a better data processing method can be obtained. Finally, the error source of the measurement system is analyzed, the generation of the error is theoretically analyzed, the corresponding error compensation method is put forward, and the factors affecting the accuracy of the measurement are analyzed in order to realize the high precision measurement of the system.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG85
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