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Since World War II, Toyota proposed the "Lean Manufacturing" management model. After receiving great success, various companies have imitated it. This research hopes to improve the competitiveness of S company by introducing "Lean -manufacturing Improvement" and propose reasonable improvement plans. Because the comprehensive introduction of the project is relatively large, the selected cases in this research aimed at the most current needs of the company. By analyzing and reviewing the value stream map of the entire resent production process, propose optimized processes and unit improvements, and then conduct acceptance and effectiveness evaluation. Therefore, the research focuses on the PCBA production of S company, since semi-finished products and raw materials of PCBA products account for more than 80% of the main inventory of S company, and the PCBA production cycle (excluding the purchase time of raw materials) takes one month. Consequently, choosing this process as the improvement goal will produce the greatest benefit to the company. Although the production of PCBA is very traditional, the current market trends for diversified production in small quantities. The requirement of matching production parameters of various electronic parts creates great complexity for the production system, such as parts procurement, material transportation, material receipt, incoming inspection, warehouse distribution and printed circuit board plug-in and assembly, packing, final quality inspection, etc. Consequently, the introduction of lean production into this process is of great benefit to the company and has high research value.
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