Project Report - Prevention Of Scoring On Bearing Shells

Transcript

In the last month January 2014, during Bearing Inspection it has been found that bearing shells of many engines got scored. Total numbers of engines (having scored bearing shells) were 23 in January, while in previous year, each month had maximum 4 Nos. engines having scored bearing shells. Scoring in bearing shells of MBs & CPS found and in some engines also on journals of MBs & CPs, due to which many engines were brought for BI (Bearing Inspection). This project is undertaken to determine and eliminate the causes of bearing shells scoring and reduce the chances of bearing failure. If bearing shells did not get scored then at least every engines which are brought for BI had circumferential lines on inner surface of bearing shells and/or on journal. Tata Motors produces the product based on WCQ (World Class Quality), so scoring on bearing shells is major problem to achieve world class quality. To eliminate or minimize this problem ( in other words to achieve WCQ) we have to work on six sigma project. Six Sigma seeks to improve the quality of process outputs by identifying and removing the causes of defects (errors) and minimizing variability in manufacturing and business processes. A six sigma process is one in which 99.99966% of the products manufactured are statistically expected to be free of defects (3.4 defective parts/million).