Abstract:
This research has an objective of reducing losses from production deficiency during the production process of automotive bulbs. The losses are categorized into two types including losses during the production process and losses between processes. The losses were analyzed from the exhaust process of the T19 bulb using Failure Mode and Effect Analysis (FMEA) coupled with severity, occurrence and detection. The analysis allows calculation of risk priority number (RPN) and corrective actions are applied when the index exceed 100.The research initialized by analysis of sales volume, revenue, cost of manufacturing, losses and occurrence on each type of bulbs. Upon the overall manufacturing process analysis of T19 bulb, it was discovered the exhaust process contribute to 82% of the total losses. This leads to the root cause investigation of deficiency that may occur during the manufacturing process and corrective actions regarding to the RPN index using brainstorming, cause and effect diagram, experiment and 3 facts evidence. As a result, 11 deficiencies of losses were mitigated. The results of the corrective actions show 11 findings with RPN index over 100 from exhaust process. After the findings were mitigated and re-evaluated, the severity remained the same while occurrence was able to decrease and the probability of detection was able to increase where 10 out of 11 findings had the RPN index lower than 100. The corrective actions have proven to decrease loss by 2.6% of the production cost and average loss value at 606,141 baht per month leading to a decrease in overall loss of 393,390.37 baht per month leading to a decrease in cost of production.