Design and develop Jig fixtures for parts of plastic injection machine to reduce working time

Abstract

This research aims to design and develop jigs for parts of plastic injection machine to reduce working time from 54.22 minutes to less than 20 minutes. The researcher used analytical techniques:  Failure Mode and Effect Analysis (FMEA) in the process and clamping of workpieces process. The process of identifying the problem, studying the problem, and finding the cause of the problem. To reduce the chance of defects from 7 causes of problems, it was found that the risk level in the workpiece clamping process can be reduced. Before the improvement, there was a risk score (RPN) of 624 points, reduced to 305 points. which represents a percentage that can be reduced by 51.12 % from the defects of the workpiece clamping process. And after develop jigs was found that the average working time of workpiece clamping process was 18 minutes, with a standard deviation was 1.936 minutes, which was able to reduce the time by 36 minutes, representing 66.66 %, and reducing costs by 4,345 baht, representing 9.07 percent.