Study on the Relation Between Gate Thickness and Molding Parameters Using PVT Diagram
| Autor: | Yao-De Huang, 黃耀德 |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 Before the product enters actual mass production, a production tool trial is often required, because a brand new mold is difficult to produce the finished product of the required specifications directly. At this time, the molded product usually has some disparities with the expected size. Traditionally, these disparities are supplemented by factory’s experienced workers relying on their personal experience to adjust the molding parameters or modify the mold appropriately instead of regulating product quality in a standardized process and this process takes a lot of time and cost. Consequently, a new mold design with movable gate was established in this study to investigate the effect of gate thickness on the filling and packing, and PVT monitoring technology was used to record the temperature, pressure and specific volume in the cavity during the molding process. And through the molding experiment, the influence of the thickness of the gate on the temperature, pressure and specific volume during molding was acknowledged to establish the application basis of the movable gate mold. In this study, in order to build a movable gate in the mold, the servo motor was used as the power source and composed with mechanism design so that the gate can move backward and forward to change the gate thickness. At the same time, three temperature sensors were buried in the mold cavity, and three pressure sensors were buried in the mold core to establish a PVT monitoring system. The experimental materials used ABS (PA-756), and experiment was conducted by using the movable gate mold with three gate thicknesses of 1 mm, 2 mm, and 3 mm and experimental parameters include melt temperature, mold temperature, filling time, packing pressure, packing time, and cooling time. The results show that increasing the gate thickness contributes to pressure transmission and maintenance and reduces shear heat generation under different experimental parameters, thus reducing the shrinkage of the product. The result is 3mm in gate thickness, 220°C melting temperature, 30°C mold temperature, 0.5 second filling time, 480% packing pressure, sufficient packing time (10.52 seconds for gate thickness 3mm), and 15.1 seconds cooling time have the best product quality. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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