การปรับปรุงอุปกรณ์จับยึดเรือนปั๊มน้ำแบบจุ่มในกระบวนการกลึงขึ้นรูปด้วยเครื่องกลึงอัตโนมัติ (CNC)

Abstract

This paper presents an improvement of a Jig holding a frame part of submersible pump in a production process with CNC turning machine in order to reduce a defect and a production time period. The original production data including the information of defective products is corrected and used to be analyzed for evaluating the cause of the defect. The analytical data shows that the original Jig has more step for setting up and also has the poor method of fastening causing the frame part is unstable during production process and being a defect. Therefore, the new design of Jig and fastening method have been improved. The parts of Jig are designed to be installed on all three clamps jaw of CNC turning machine and the previous method of fastening, all three clamps jaw of CNC turning machine that being inside the cylindrical frame part are then stretch simultaneously to press inner surface of this cylindrical frame part, has been changed. For new design, Jig will be installed on all three clamps jaw will press to outer surface simultaneously when all three clamps jaw move inward. A new Jig parts are designed to be covered almost of the length of the frame part and also has an adjustable screw for setting up an alignment and a stable position of the frame part before machining. Moreover, the new Jig can also be installed on the other three CNC turning machine in the same production process that make the production line is flexible to use replacement part of Jig on another CNC turning machine if there is one was shutting down. The prototype of the new design of Jig is fabricated for testing in the frame part production process with CNC turning machine. Initially, the sample of the test shows that the new Jig can help to reduce the setup time of each frame part for machining from 7.01 minutes to be 2.45 minutes and also can help to reduce the defect of 2.60% to be 0.448%. Moreover, the new Jig can be installed in the other CNC turning machine as mention before by using the related equipment in the same function.