Closed-loop control of gas pressure in the gas-assisted injection molding process

1999 ◽  
Vol 18 (2) ◽  
pp. 137-145 ◽  
Author(s):  
Shia-Chung Chen ◽  
Sher-Meng Chao
Keyword(s):  
Injection Molding ◽  
Closed Loop ◽  
Gas Pressure ◽  
Injection Molding Process ◽  
Closed Loop Control ◽  
Molding Process ◽  
Loop Control

Determination of Optimum Process Parameters in Gas-Assisted Injection Molding

2011 ◽  
Vol 143-144 ◽  
pp. 494-498
Author(s):  
Ke Ming Zi ◽  
Li Heng Chen
Keyword(s):  
Injection Molding ◽  
Delay Time ◽  
Optimization Design ◽  
Gas Pressure ◽  
Optimum Process ◽  
Injection Molding Process ◽  
Technological Parameters ◽  
Molding Process ◽  
Element Analysis ◽  
Melt Temperature

With finite element analysis software Moldflow, numerical simulation and studies about FM truck roof handle were conducted on gas-assisted injection molding process. The influences of melt pre-injection shot, gas pressure, delay time and melt temperature were observed by using multi-factor orthogonal experimental method. According to the analysis of the factors' impact on evaluation index, the optimized parameter combination is obtained. Therefore the optimization design of technological parameters is done. The results show that during the gas-assisted injection molding, optimum pre-injection shot is 94%,gas pressure is 15MPa,delay time is 0.5s,melt temperature is 240 oC. This study provided a more practical approach for the gas-assisted injection molding process optimization.

Solidification sensing for closed loop control of injection molding hold time

1996 ◽  
Vol 15 (2) ◽  
pp. 151-163 ◽  
Author(s):  
Charles L. Thomas ◽  
Ampere A. Tseng ◽  
Anthony J. Bur ◽  
Joseph L. Rose
Keyword(s):  
Injection Molding ◽  
Closed Loop ◽  
Hold Time ◽  
Closed Loop Control ◽  
Loop Control

Solidification sensing for closed loop control of injection molding hold time

1996 ◽  
Vol 15 (2) ◽  
pp. 151-163 ◽  
Author(s):  
Charles L. Thomas ◽  
Ampere A. Tseng ◽  
Anthony J. Bur ◽  
Joseph L. Rose
Keyword(s):  
Injection Molding ◽  
Closed Loop ◽  
Hold Time ◽  
Closed Loop Control ◽  
Loop Control

Proportional Pressure Control of Water Hydraulic System for Water-Assisted Injection Molding: Modeling and Simulation

2008 ◽  
Author(s):  
Zengmeng Zhang ◽  
Hua Zhou
Keyword(s):  
Injection Molding ◽  
Modeling And Simulation ◽  
Hydraulic System ◽  
Closed Loop ◽  
Injection Pressure ◽  
Pressure Control ◽  
Closed Loop Control ◽  
Load Characteristic ◽  
Loop Control ◽  
Water Hydraulic

The proportional pressure control of water hydraulic system for water-assisted injection molding (WAIM) is investigated through modeling and simulation. WAIM is an innovative process to mold plastic parts with hollow sections. A water hydraulic system is designed for WAIM and a differential pressure control strategy is provided to regulate the water injection pressure by a proportional relief valve. An accumulator and a pressure cylinder are applied in the system and modeled in MATLAB. The load characteristic is analyzed and the coupling relationship between load pressure and flow rate is approximately simulated. Based on the variable-parameter model with linearization, open-loop and closed-loop control with multi-point feedback are investigated. Integral compensation and PI control are used with slope control of injection pressure. In addition, the influence of load characteristic is also investigated. Results of the simulation show that the closed-loop control contributes to the stability and disturbance resistance performance under various load characteristics.

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