Quality control process improvement of flexible printed circuit board by FMEA

2017 International Conference on Sensors, Materials and Manufacturing

工业技术;材料科学;机械制造

Krasaephol, Siwaporn^1 ; Chutima, Parames^1,2

Department of Industrial Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok

10330, Thailand^1

Regional Centre for Manufacturing Systems Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok

10330, Thailand^2

关键词: Control process;    Defective products;    Failure mode and effect analysis;    Flexible printed circuit boards;    Inspection process;    Production line;    Proportion of defective;    Work in process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/311/1/012009/pdf
DOI  :  10.1088/1757-899X/311/1/012009

来源: IOP

【 摘 要 】

This research focuses on the quality control process improvement of Flexible Printed Circuit Board (FPCB), centred around model 7-Flex, by using Failure Mode and Effect Analysis (FMEA) method to decrease proportion of defective finished goods that are found at the final inspection process. Due to a number of defective units that were found at the final inspection process, high scraps may be escaped to customers. The problem comes from poor quality control process which is not efficient enough to filter defective products from in-process because there is no In-Process Quality Control (IPQC) or sampling inspection in the process. Therefore, the quality control process has to be improved by setting inspection gates and IPCQs at critical processes in order to filter the defective products. The critical processes are analysed by the FMEA method. IPQC is used for detecting defective products and reducing chances of defective finished goods escaped to the customers. Reducing proportion of defective finished goods also decreases scrap cost because finished goods incur higher scrap cost than work in-process. Moreover, defective products that are found during process can reflect the abnormal processes; therefore, engineers and operators should timely solve the problems. Improved quality control was implemented for 7-Flex production lines from July 2017 to September 2017. The result shows decreasing of the average proportion of defective finished goods and the average of Customer Manufacturers Lot Reject Rate (%LRR of CMs) equal to 4.5% and 4.1% respectively. Furthermore, cost saving of this quality control process equals to 100K Baht.