Abstract:
This research aims to develop a quality cost measurement system and to reduce the quality cost of drawing and laser cutting process for sheet metal fabrication plant. This reseach analyze activities and factors that affect to the developed quality cost measurement in drawing and laser cutting department. The cost analysis adupt PAF Model. Problem identification and improvement analysis were analysed by using checksheet to collect the data, Pareto diagram to arrange the order of problems; Fish bone diagram to identify cause and effects of the problem; Why-why analysis to analyze the reletionship between problems, main causes and solution; Bar diagram to compare quality cost before and after quality cost reduction; Total cost of Quality is reduced by training workers to the concept of quality cost, improving work standards and work order checksheep. After the improvement, the prevention costs of drawing and laser cutting department increased from 10,301 baht per month to 36,169 baht per month, appraisal costs increased from 7,283 baht per month to 16,758 baht per month, internal failure decreased from 16,226 baht per month to 2,027 baht per month. In addition, the external failure cost reduced from 122,275 baht per month to 13,157 baht per month. Hence, the total cost decreased average from 156,086 baht per month to 68,111 baht per month or 56.36% cost reduction. The case company can save 87,975 baht per month from applying the CoQ concept.