Multi response optimization of internal grinding process parameters for outer ring using Taguchi method and PCR-TOPSIS

摘要

Bearing is one of the most widely used parts in automotive industry. One of the leading bearing manufacturing companies in the world is SKF Indonesia. This company must produce bearing with international standard. SKF Indonesia must do continuous improvement in order to face competition. During this time, SKF Indonesia is only performing quality control at its Quality Assurance department. In other words, quality improvement at SKF Indonesia has not been done thoroughly. The purpose of this research is to improve quality of outer ring product at SKF Indonesia by conducting an internal grinding process experiment about setting speed ratio, fine position, and spark out grinding time. The specific purpose of this experiment is to optimize some quality responses such as roughness, roundness, and cycle time. All of the response in this experiment were smaller the better. Taguchi method and PCR-TOPSIS are used for the optimization process. The result of this research shows that by using Taguchi method and PCR-TOPSIS, the optimum condition occurs on speed ratio 36, fine position 18μm/s and spark out 0.5 s. The optimum conditions result were roughness 0.398μm, roundness 1.78μm and cycle time 8.1 s. This results have been better than the previous results and meet the standards. The roughness of 0.523μm decrease to 0.398μm and the average cycle time of 8.5 s decrease to 8.1 s.