Abstract:
This research was a study and application of the principles of designing, improving and implementing of the acceptance sampling plan based on a case study of the completed knock down (CKD) parts for exported manufacturing process. The problem encountered was the ineffectiveness of the existing acceptance sampling plans used in inspecting parts before packing and delivering to customers. To assist in this situation, the statistical evaluation techniques were applied to evaluate the performance of the existing sampling plans. The plans which were indicated to have low performance were improved or discontinued. In such circumstance, the replacement plans were designed based on the MIL-STD 105E. There inspection sampling plans, General Inspection (G1), Special Inspection (S1) and General Inspection (G2), had been created. The switching rules for swapping between these plans when applied had also been proposed based on the historical record of the inspection quality. The comparison between the currently used and the new proposed sampling plans in terms of their performances indicated that that of the new proposed sampling plans were better. Then, the latter had been used for real situation inspection. Since then, the results had indicated that defect rate from the previous process reduced by 31.95% and defectives could be detected before packing and sending to customers. Therefore, it can be concluded that the proposed set of the inspection sampling plans can successfully lead to the level of a quality control inspection required by the organization. Hence, they are recommended for further application under a long term continuing monitoring system.