Abstract:
This research aims to reduce the amount of defects generated within the process of brake pad production by using DMAIC method stage of Six Sigma. According to the case study companys target, the amount of defects caused by pad crack problem should be decreased by 30%. The cure pressing process of disc brake pad model X068 production is selected for this study. In order to accuracy and precision measurement system, the specification of disc brake pad is controlled with the compression value ranging from 50 -100 um.
The research methodology consists of 5 steps: (1) Define phase, the process capability index of disc brake pad production is evaluated, (2) Measure phase, the root causes of problem are determined, (3) Analysis phase, each one factor is analyzed, (4) Improve phase, the design of experiments (DOE) with 2k Full Factorial is used to investigate the relationship and the optimal value of each factor at a significant level of 0.05, and (5) Control phase, the statistical process control (SPC) is applied to control the process.
After improvement by implementing the DMAIC method, it found that the scrap rate is reduced from 6.63% to 2.58% of all defect rates. Thus, with this improvement the amount of defects can be reduced by 61.07% of company policy.