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Research Papers

Cavity Air Flow Behavior During Filling in Microinjection Molding

[+] Author and Article Information
C. A. Griffiths1

Cardiff School of Engineering, Cardiff University, Queens Building, Cardiff, CF24 3AA, UK

S. S. Dimov, S. Scholz

Cardiff School of Engineering, Cardiff University, Queens Building, Cardiff, CF24 3AA, UK

G. Tosello

Department of Mechanical Engineering, Technical University of Denmark, Kgs. Lyngby DK2800, Denmark

1

Corresponding author.

J. Manuf. Sci. Eng 133(1), 011006 (Jan 24, 2011) (10 pages) doi:10.1115/1.4003339 History: Received July 27, 2010; Revised December 21, 2010; Published January 24, 2011; Online January 24, 2011

Process monitoring of microinjection molding (μ-IM) is of crucial importance in understanding the effects of different parameter settings on the process, especially on its performance and consistency with regard to parts’ quality. Quality factors related to mold cavity air evacuation can provide valuable information about the process dynamics and also about the filling of a cavity by a polymer melt. In this paper, a novel experimental setup is proposed to monitor maximum air flow and air flow work as an integral of the air flow over time by employing a microelectromechanical system gas sensor mounted inside the mold. The influence of four μIM parameters, melt temperature, mold temperature, injection speed, and resistance to air evacuation, on two air flow-related output parameters is investigated by carrying out a design of experiment study. The results provide empirical evidences about the effects of process parameters on cavity air evacuation, and the influence of air evacuation on the part flow length.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 3

Air flow transducer

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Figure 4

A sample air flow curve

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Figure 5

Diagram of Q̇max and Q results, and flow length results

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Figure 6

Variation in the part flow length

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Figure 7

Interval plot of Q̇max, Q, and flow length

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Figure 8

Main effects’ plot of Q̇max and Q

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Figure 9

Main effects’ plot for the flow length

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