Abstract:
This research aims to reduce the losses and the cost of wastage occurred according to the failure of fin welding machine in the process of frame production at the electric motor factory. This machine is a specific for the fin welding only and there is no substitute machine thus it is identified as a bottleneck. These failures directly impact the whole processes of electric motor production.
The research methodology applied the analysis of overall equipment effective (OEE) technique and the why-why analysis technique which was divided into 6 stages: 1) establishing small group with the concept of participation. The group membership consists of support production section, production and maintenance section, 2) Training, 3) investigating the current situation and the occurred problem by using the analysis of overall equipment effectiveness technique and then Pareto diagrams is used to classify the problem for improvement, 4) analyzing the root causes and identifying the solutions by using the why-why analysis, 5) implementing with corrective action, 6) monitoring and measuring with the OEE indicator before and after the improvement.
After improvement with the corrective action and daily maintenance, the failure rate is reduced that leads to the average OEE value of the fin welding machine increases from 77.88% to 82.82%. Then the percentage of improvement equals to 4.94%. The average cost of losses decreased from 198,667.00 baht per month to 137,939.60 baht per month which reducing by 60,727 baht per month.