基于六西格玛的ENC公司无线基站生产良率改进研究

发布时间：2018-09-12 17:20

【摘要】：目前,商品和服务的市场全球化正在不断发展。全球化使得商品与服务的质量对于达到客户满意度变得越来越重要,甚至直接影响着公司的发展前景。质量工作中一个重要的部分就是降低由于生产良率损失带来的相关质量成本。本文的目的便是研究在ENC公司的无线基站生产中为何会产生良率损失以及如何去有效的降低这些良率损失。论文的研究工作将基于无线基站产品开展,研究形式则是基于六西格玛的DMAIC质量改进方法。在定义阶段,2015年底数周的良率数据统计结果为84%,低于2016年的目标要求90%。SIPOC图的制作使研究对于整体的无线基站装配测试流程有了一个大概的理解。测量阶段则通过详细的流程图进一步了解了装配与测试流程。并且通过一一列举出的测试站与待测无线基站间的各个接口关系,更加强了对于测试环节的解读。在此环节也提供了更详细的关于测试组、测试点、测试项、测试值等关系的信息。测试环节的流程研究也提供了测试中各种信息数据的存储与收集方法。分析阶段首先将良率损失分解成不同类别,并且发掘出离散(Outlier)类是对良率损失贡献最大的。进一步分析数据发现,无故障码分配(NFF)是造成Outlier良率损失的重要原因。通过头脑风暴以及一些列的研讨会,连接不良以及几种不同的测试值被重点突出,作为研究ONFF潜在根因的着重分析方向。使用帕累托图等分析手法,又得出了一些测试连接不良以及个别几个测试值是最经常造成ONFF良率损失的直接原因。进而选择了相关的连接以及测试值分析了External Alarm Check良率损失的根因。通过时间维度去分析External Alarm Check良率损失并没有得到对根因分析有用的结论。通过与测试技术人员探讨,相关良率损失与测试线缆的连接有着很大关系。进一步分析造成线缆连接不良的原因：软件中缺少连接预检、线缆缠绕、测试夹具问题、接口设计问题以及相关维护的问题。对于这个测试点的分析中,也发现了重测流程以及维修信息录入的待改进空间。基于这些发现,在改进阶段给出了相关的改进建议以降低各种潜在根因对良率的影响。并且建议ENC公司标准化稳定的测试站环境、在所有测试点上进行连接预检、研发新的接口、重新梳理维护规则、标准化重测流程、保证维修信息的输入等。最后在控制阶段,强调了改进建议的持续执行。
[Abstract]:At present, the market globalization of goods and services is developing continuously. Globalization makes the quality of goods and services more and more important to achieve customer satisfaction, and even directly affects the development prospects of the company. An important part of quality work is to reduce the quality costs associated with loss of yield. The purpose of this paper is to study why and how to reduce the yield loss in ENC's wireless base station production. The research work will be based on the wireless base station product, and the research form is the DMAIC quality improvement method based on six Sigma. In the definition phase, the yield data for the weeks of late 2015 was 84, which is below the target of 2016. The production of the 90%.SIPOC diagram gives the research a general understanding of the overall wireless base station assembly testing process. In the measurement stage, the assembly and testing process is further understood through a detailed flow chart. And through each interface relation between the test station and the wireless base station to be tested, the interpretation of the test link is strengthened. This section also provides more detailed information about test groups, test points, test items, test values, and so on. The research of test procedure also provides the method of storing and collecting all kinds of information data in test. In the analysis stage, the yield loss is decomposed into different classes, and the discrete (Outlier) class is found to contribute most to the yield loss. Further analysis shows that fault-free code allocation (NFF) is an important reason for the loss of Outlier yield. Through brainstorming and a number of columns of seminars, poor connectivity and several different test values are highlighted as an analytical focus on the underlying causes of ONFF. By using Pareto diagram and other analytical techniques, it is found that some poor test connections and a few test values are the most frequent causes of the loss of ONFF yield. Then the related connection and test value are selected to analyze the root cause of External Alarm Check yield loss. The analysis of External Alarm Check yield loss by time dimension does not lead to a useful conclusion for root cause analysis. Through discussion with the test technicians, the relative yield loss is related to the connection of the test cable. Further analysis of the causes of poor cable connection: the lack of software connection pre-check cable winding test fixture problems interface design problems and related maintenance problems. In the analysis of this test point, the retesting process and the room for improvement of the input of maintenance information are also found. Based on these findings, suggestions for improvement are given in the improvement phase to reduce the effects of various potential root causes on yield. It is also suggested that ENC company should standardize the stable test station environment, connect and pre-check at all test points, develop new interfaces, rearrange maintenance rules, standardize the re-testing process, and ensure the input of maintenance information, etc. Finally, in the control phase, the continuous implementation of the improvement recommendations is emphasized.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN05

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