Study of Pressure Monitoring for Plastic Injection Mold

• Main Author: 張益裕
• Other Authors: 張錦鋒 博士
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/08420927790557715555

碩士 === 國立彰化師範大學 === 電機工程學系 === 101 === The success Rate of thermoplastic injection molding depends on mold temperature and pressure of injection machine. High defect rate and incomplete product due to insufficient mold temperature and unstable molding pressure increase the producing cost and decrease the product competitiveness. This study proposes a molding process analysis to detect the pressure of every running tunnel and ensure the performance of the product. Moreover, a real-time mold pressure monitoring device with high sensitivity is proposed which is to detect the pressure of running point and the amplifier output voltage to be controllable signal. Through PSpice monitoring analysis on the amplifier circuit, the proposed monitor system is proved to be feasible for pressure detecting of thermoplastic injection molding. 200pcs testing run was done, the result shows that the defect fraction rate can be reduced from 10% to 6%. This molding temperature control system greatly increases the quality of the injection products as well as its competitiveness.