| JIT is the achievement of global manufacturers in the complementary development of management and technology. With the rapid development of global economy and informatization, Japan's manufacturing technology and that in Europe and America are continuously converging and improving with each other. Such method of convergence is adopted by Some large –scale enterprises when they conduct production experiments, forming a set of scientific tools on the basis of JIT theory, which can assure effective evaluation and supervision for enterprises' development. JIT theory is the best tool and good choice for enterprises to reduce manufacturing costs, increase enterprises' gain and improve market competitiveness. A company's current state is that the assembling line capacity can't meet the market demand, the assembling line balancing rate is low, the work load between different work stations aren't uniform, raw materials inventory is high, so that assembling line will waste much time for material's distribution.This paper discussed A company by using the method of JIT to optimize the combi-boiler assembling line. Firstly the industrial engineering theory is implemented, through Gemba Kaizen by 5S. The assembling line cleaning time every day is reduced, layout the workshop is re-scheduled, as well as the separation of pedestrians and vehicles, to ensure smooth logistics channel based on security. At the same time the color management and visual management is implemented, to ensure that the materials can be put into the right position with maximum speed, prepare for internal logistics improvement.The second priority is to focus on the application of 3M from JIT,analyze the moving route of operators on each position by MUDA to eliminate unnecessary movement and transport therefore reduce operational workload,optimize post process and reposition materials. Then analyze the operation action and optimize the material position in accordance with golden operational area and raw material shelf system to improve the comfort of the operators and reduce IE time. In this way, every process quantity is improved. Third, recognize the imbalanced and irregular process in each position by MURA. Ensure the stability of each process by improving raw material position and facility. Define the standard operational time of each position and write it into the instruction manual, redefine the assembling line's Takt time as well. Finally, in cooperation with Milk-run, external logistics reduces the stock of raw material and efficiency of company capital and internal logistics decreases the stand by time of assembling line to be prepared. Base on the continuous improvement of the above JIT methods, the comprehensive productivity of A company's combi-boiler has a great leap.At last, this paper compares the statistics of before and after improvement and concludes that through the implementation of 5S and relay-out of workshops, the average clean-up time of the assembling line is shortened by 10 minutes with productivity increasing from 109 pieces every day to 111 pieces every day. With the aid of 3M, productivity rises to 139 pieces every day. Furthermore,with the improvement of logistics, productivity rises to 143 pieces every day and the annual capacity of assembling line rises from 34000 pieces to 44000 pieces which not only meets the marketing sales demand but also cut 29 yuan for each cost,saving 1.16 million yuan for the company every year. This has greatly improved the production efficiency, lowered the production cost and improved the market competitiveness of A company's products. The study and result has certain reference for the whole combi-boiler field or other related fields. |
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