Abstract:
This research addressed an improvement of raw material inspection in mining excavator manufacturer. The research objective is to reduce the number of nonconforming raw material in the production line. Quality and production reports in the past showed that nine suppliers often delivered poor quality raw material to our plant. The percentage of nonconforming raw material was 9.76%, on average of the delivered material by those suppliers. Through incoming inspection had been performed, nonconforming raw materials were found frequently in the production line. The percentage of the nonconforming raw materials found in production line was 9.3% comparing to total number of nonconforming raw materials delivered by suppliers. The Measurement System Analysis, MSA, was applied to determine the efficiency of incoming inspection process. Three incoming inspectors were assessed their abilities for sorting nonconforming material. The MSA results showed that their abilities were failed to meet assessment criteria. Measurement method and environment were evaluated to increase their abilites. The evaluation results explained that the measurement problems were two reasons. The first reason was hurried inspection causing from material requirement due date of the production line. The second reason was illumination level at the incoming inspection station. Therefore one lighting panel was added into the station for increasing the illumination level. The inspection time was consequently reduced because inspection activities were eliminated. The activities included moving inspection parts or lighting panel location in order to get enough brightness at the inspection spots. The results of this research revealed that the percentage of nonconforming raw materials found in production line was reduced to 6.82% and the average inspection time was reduced 2.29 minutes per part, approximately.