The car is considered to be one of the sophisticated artifacts in the production process. Starting from sheet steel is coming into the machine assembled by hand and one hand robot until it sees a clear structure of the car. Who will see that steel is considered to be one of the important raw material in the production process. From the study of company Toyota. Country-Thailand co., Ltd. in motor production plant to pump the tank, noticed that the current plant has been ordered to make steel sheet stamping forming part of the external structure, all of the pickup a lot per day. By body pump factory production line is the major raw material transport processes are to receive raw materials from small vendors to keep a stock of raw materials for disbursement to the production plan. Before the raw material is transported to the stamping machine. Must have raw material to plastic wrappers off sheep and checks the size width? The length of the thickness of the steel sheet to meet the standard set values. From the initial problem showed that there is a problem of waste generated in the production process, such as a steel plate to tear while stamping due to quality problems of steel sheet. Moreover, if the waste is being sent into the next process. Nick can cause a lot of losses. That is, if the problem cannot be resolved, the company won't be able to deliver cars to distributors. Cause loss of production costs to benefits for doctoral thesis prepared at all realizes the importance of this issue. By seeing whether there is a point to check the quality of the steel sheets before going to production process reduces waste and prevent the occurrence of problems, other problems that followed due to the raw material quality.
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