Dr. Rupendra Nehete
Dr. Pradip P. Patil
Tushar Jangam
Abstract
Spring is a general mechanical component used for absorption of shocks and vibration. The suspension system used in FIAT Bogie is double suspension system in which nested springs are used. The most common problem of the failure of suspension system is the failure of springs during service. Failure causes of any component should be rectified for smooth functioning. Root causes analysis is used for the same purpose; it is an integrated method to find the root causes of the failure problem and finding out the sustainable solution on the same. As the failure of spring does not causes any halt or serious breakdown of the working of railway bogie it is difficult to find out the time of failure under available resources. This paper discuss the root cause analysis of the failure of primary inner spring of Fiat Bogie along with the Pareto analysis of the same to find out the causes responsible maximum failure. The major reasons of the failure of spring are the failure due to reduction in the permissible free height, corrosion and rubbing marks. In defect analysis carried out till March 2019 total 144 defects occurred and root cause analysis and Pareto diagram is presented in this report.
Keywords- Failure, ISHIKAWA diagram, Pareto, Root Cause Analysis, and spring.