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在线测量技术是白车身尺寸监控的重要手段。通过对白车身焊装尺寸测量技术的特点的分析,针对一汽-大众轿车二厂焊装车间质量管理中白车身的尺寸控制问题,结合在白车身生产现场的研究,提出了白车身生产中在线测量技术的优化方案。 相似文献
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介绍光学经纬仪大尺寸三坐标测量系统的原理、组成以及数据采集分析,探讨光学经纬仪空间三维坐标移动测量系统及测量分析软件,以实现如汽车车身、轮船船体、机床导轨等加工制造中大距离的在线检测. 相似文献
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为了解决白车身在制造过程中发现的问题,利用白车身三坐标尺寸测量、检具测量数据统计分析等方法对问题产生原因进行分析,提出了从主机厂车身车间焊接拼台定位改进、总装车间装配方法优化等几个环节来制订方案,为提高白车身尺寸制造精度提供了较为系统的问题解决思路。 相似文献
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以往需要个小时左右才能完成汽车白车身的检测 而现在通过激光视觉检测 只要分钟就能完成。由天津大学精仪学院叶声华教授领导的课题组和南京依维柯汽车有限公司车身厂共同承担的国家“"高科技项目“依维柯白车身三维激光视觉检测系统”日前研制成功。这标志着我国第一套用于整车检测的激光三维尺寸自动测量系统已经诞生 其性能指标已达国际先进水平。 该系统是一项复杂的工程测量项目 具有较高的可靠性和创新性。 目前 国内汽车行业对汽车车身的测量 全部采用三坐标测量机进行测量 速度慢劳动强度大人为测 《工具技术》2001,35(2):43
以往需要6个小时左右才能完成汽车白车身的检测,而现在通过激光视觉检测,只要7分钟就能完成。由天津大学精仪学院叶声华教授领导的课题组和南京依维柯汽车有限公司车身厂共同承担的国家“863"高科技项目“依维柯白车身三维激光视觉检测系统”日前研制成功。这标志着我国第一套用于整车检测的激光三维尺寸自动测量系统已经诞生,其性能指标已达国际先进水平。 该系统是一项复杂的工程测量项目,具有较高的可靠性和创新性。 目前,国内汽车行业对汽车车身的测量,全部采用三坐标测量机进行测量,速度慢、劳动强度大、人为测量误差较大,无法实现在线检测。而国外汽车行业已经将激光视觉检测技术用于汽车车身的检测与质量控制,有效地提高了汽车车身的焊接质量。该系统还具有较大的经济效益,每套系统均可节省引进设备资金1500万元人民币。 相似文献
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轮对尺寸在线检测设备在日常使用过程中产生一系列测量数据,但受多个因素影响,难以直接对其测量精度进行评估,因此迫切需要行之有效的测量精度分析方法.而在各行各业成熟应用的精益六西格玛管理工具中,丰富的数据图形统计工具与测量系统分析工具为解决在线检测设备测量精度分析难题提供了新的解决思路.以轮对尺寸在线检测设备为例,利用精益六西格玛数据图形统计工具与测量系统分析工具对其测量精度进行了一系列分析,证明了该研究方法适合用于在线检测设备在非试验条件下产生的测量数据基础上的测量精度分析. 相似文献
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In dimensional inspection of large objects, portable measuring systems are greatly involved in a wealth of applications, such as automotive, motorsports and aerospace industries. Metris K-series Optical CMM (Coordinate Measuring Machine) system is one of the metrology solutions with relatively high accuracy and flexibility. This paper focuses on measurement strategy via repeatedly measuring a length using Metris K610 camera system. The paper proposes a link between measurement strategy and the system performance that can be achieved. The result of the statistical analysis are also given based on the uncertainty propagation of the CMM. 相似文献
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坐标测量机是典型的面向任务的测量设备,测量任务的改变将引入不同的测量不确定度。怎样评估坐标机面向任务的测量不确定度,目前我国还没有这方面专门的技术规范。参考ISO/TS15530系列标准,介绍了坐标测量机面向任务的不确定度评估原理和方法。 相似文献
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Y. Javid M. Ghoreishi 《The International Journal of Advanced Manufacturing Technology》2017,91(1-4):69-78
The increasing interest towards intelligent systems has led to a demand for the development of zero-defect strategies, with a paradigm shift from off-line and dedicated to in-line metrology with integrated robotic systems. However, a major barrier preventing the systematic uptake of in-line metrology is the lack of evaluation of system capability in terms of accuracy, repeatability and measurement time, when compared to the well-established coordinate measuring machine (CMM). In this study, a robotic Laser Radar (LR) solution is assessed in the context of automotive dimensional inspection of Body-In-White (BIW) applications. The objective is both to understand the effect of robot re-positioning error on measurement accuracy and repeatability and to compare measurement results against a CMM. Eighty-one surface points, six edge points, twenty-five holes and sixteen slots were selected from an industry standard measurement plan. Whilst LR exhibits a lower measurement accuracy than twin-column CMM, its repeatability is well within the specification limits for body shell quality inspection. Therefore, as a real-time in-line metrology tool, it is a genuine prospect to exploit. This research makes a significant contribution toward in-line metrology for dimensional inspection, for automotive application, for rapid detection and for correction of assembly defects in real time, with subsequent reduction of scrap and number of repairs/re-works. 相似文献
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Wang Hua Chen Guanlong Zhu Ping Lin Zhongqin 《The International Journal of Advanced Manufacturing Technology》2006,27(7-8):733-737
The main goal of this paper is to describe a method based on the continuous wavelet transform (CWT). The Shannon entropy of
CWT coefficients in each scale is calculated in order to detect the characteristic trends of the CMM measurement data efficiently.
This method is successfully implemented in a body-in-white (BIW) assembly for the detection of periodic trends in coordinate
measure machine (CMM) data. It would contribute to main cause location in BIW quality control. The principle of the CWT and
the property of the periodic trend after the CWT are explained from a mathematical viewpoint. An actual quality-control case
is analyzed using the CWT method. Consistency between the results and the actual situation proves the effectiveness of this
CWT method. 相似文献
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三坐标测量是现代制造业中不可缺少的测量手段,其中单臂式三坐标测量仪使用广泛。由于其结构特殊,有必要了解影响测量精度的因素。单臂式三坐标仪器测量精度与自身的制造精度有关,还与测量环境、坐标系建立、以及被测工件的摆放和定位等因素有关。 相似文献
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