| One of the important content of humanized design of mobile phone is to control t AA area to the edge of LCD module screen size strictly, which makes the display area in the center of the area open window shell. The control key of display module AA area to module edge size lies in the CPK. In March2011, Kemi3.5"HVGA products in the factory is found that the CPK of AA area to module edge size is0.99below the size CPK1.5which customer requirements, so CPK improvement project of AA area to module edge size is set up. The project is the main content of this paper.First of all, this paper summarizes the related theory and method which the project need. The six sigma quality management methods, minitab software and measurement system are introduced. Secondly, this paper introduces the six sigma quality management method in the process of the project and the performance of the project. Finally, according to the six sigma quality management method, the main content of the four stages that are the definition and measurement, analysis, the improvement and the control are introduced.Through the research the following results are found. First of all, template and backlit clearance tolerance need to adjust, otherwise the requirements of the1.5CPK can’t meet. To low the tolerance to0.35mm, the CPK can meet the requirements. Secondly, based on the data analysis with Minitab, the results show that Panel and backlit gap is the key factor of CPK variation. Third, through the analysis, it is pointed out that the assembly clearance and design gap are the root cause of the CPK failure, and creating the improvement plan:the design value change to0.1mm and the fixture on the upper left corner assembly. Finally, through the data collection and analysis, the effectiveness of the plan is verified, and CPK is remarkably improved. Results show that the six sigma quality management method in the application of this project is very successful. |
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