Abstract:
The purpose of this research is to increase productivity in assembly process of Outdoor Signal Converter Printed Circuit Boards focusing on the reduction of manufacturing cycle time at the soldering wave station which is relevant to nine crucial concerning factors. According to the study of Sensitivity Analysis and Experiments Design, the results showed that three core effect factors, which should be considered in order to improve the production, are fixture waiting time, natural process time and setting time for wave parameters. There are two interaction effect factors which are the fixture waiting time and the natural process time. On account of all these factors, they could help to improve the speed of soldering wave machine by setting the wave machine parameters in the conveyor speed 60 centimeter per Minute. Solder Nozzle Speed 40 centimeter per second and Flux pump 80 hertz. To maximize the benefit of soldering wave machine, it is necessary to improved by increasing the fixture quantities from 5 pieces to 12 pieces and reducing the setup time derived from adding one set of computer at the soldering wave station. As a result of these three improvement methods, these could deduct the current production cycle time from 528.56 second per piece to 324.97 second per piece or 38.52% reduction. This could contribute to the increase of production output from 143 pieces per day to 232 pieces per day (Increasing 89 pieces per day). The investment cost of these improvements is around 121,500 Baht while the production cost decreases to 95,544.80 Baht per Month. All in all, the payback period is only 1.27 months.