共查询到19条相似文献,搜索用时 281 毫秒
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白车身是汽车的核心部件之一,它的制造质量对汽车的整车性能起着关键性的作用.而尺寸精度是白车身制造质量的关键技术,因此控制白车身的尺寸精度有着极其重要的意义.在车身车间生产工作中,采用三坐标测量数据,提出基于三坐标测量的汽车白车身尺寸控制策略,并通过应用实例验证了策略的有效性. 相似文献
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本文探讨了激光跟踪仪的使用特点以及近年来最新发展的6D测量技术,并基于此提出了车间现场环境中车身的检测和分析方案,及时、快速的发现和解决车身零件制造,装配,尺寸分析等问题,提高汽车车身测量效率和生产质量。 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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车身由多个工件组成,在汽车整个制造过程中车身制造难度系数较高,但也是不可忽视的重要环节。车身尺寸精准度直接关系到汽车的运行性能、美观性、整体质量等,必须高效控制车身的尺寸。因此,本文在分析车身尺寸制造控制现状基础上探讨了基于SPC数据控制的在线检测车身尺寸方法与应用,促使车身制造更加可控、稳定以及准确,最大化提升车身尺寸精准度。 相似文献
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据统计,白车身装配尺寸偏差导致的质量问题占整车缺陷的30%。影响白车身尺寸偏差的因素有很多,例如原材料质量、工人操作、零件装夹方式、焊接.定位方式的、定位销的磨损等等。非接触式光学测量机的出现.使车身制造的在线检测成为现实。在线检测技术为车身制造过程提供100%的、实时的质量检测数据, 相似文献
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汽车白车身焊接质量控制决定了汽车整体质量,所以,汽车焊接技术人员应熟练掌握各种白车身焊接相关技术,并在焊接过程中严格控制焊接质量,同时汽车白车身焊接相关管理人员应严格监督焊接作业过程,并合理运用相关检测技术加大对白车身焊接质量的检测力度,从而从根本上保证汽车白车身焊接质量。本文介绍了汽车的几种焊接工艺技术,针对这几种焊接工艺技术阐述了质量控制的方法,并说明焊接资料的检测方法和评价基准。 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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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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Hua Wang Guanlong Chen Ping Zhu 《The International Journal of Advanced Manufacturing Technology》2004,24(11-12):830-833
Optical coordinate measuring machine (OCMM) has been widely used in body-in-white (BIW) assembly industry, but most of the studies associated with OCMM data are limited to detecting sudden changes of OCMM data from the control chart. The process of BIW assembly is a nonstationary time series. Leap, linear and periodical trends are three mean shifts of OCMM data. This paper introduces one simple and applicable method to evaluate the BIW assembly quality with OCMM data. Wavelet analysis is employed to separate the trend and variation in OCMM data. A practical case analysed by wavelet analysis proves the effectiveness of using variation of the OCMM data to evaluate the BIW assembly quality. The data-splitting error using wavelet analysis is estimated with Monte Carlo simulation . 相似文献
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Adaptive sampling for coordinate metrology 总被引:1,自引:0,他引:1
An iterative sampling process for dimensional measurement is presented. The strategy is based upon the use of surface normal measurement data to develop an interpolating curve between sample points. The interpolant is used to select subsequent measurement targets iteratively. The process is repeated until the measurement converges to a complete and accurate evaluation of the surface. The required sample size is proportional to part quality. The most accurate parts will require the least sample points; whereas, lower quality parts will require a greater number of total samples. The method is particularly applicable to measurement of complex surfaces with coordinate measuring machines (CMMs). 相似文献
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针对目前产品装配顺序通常从装配时间和装配成本角度来考虑而难以保证装配质量的情形,应用偏差流分析法,以提高装配质量为目标,提出一种新的二维多工位装配顺序优化方法。以多工位装配过程为研究对象,分析影响装配质量的偏差源,建立偏差及其传递的数学模型,应用装配稳健度概念来评价装配工艺流程方案的优劣。以汽车侧围的4个零件装配为例,运用装配稳健度分析、比较了三种不同的装配顺序,得到了较优的装配方案。实例分析和仿真表明,应用装配稳健度可以分析选择装配顺序方案,为优化设计多工位装配工艺流程提供了新的途径。 相似文献