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Gas-assisted powder injection molding: A study on the effect of processing variables on gas penetration

Identifieur interne : 001302 ( Main/Exploration ); précédent : 001301; suivant : 001303

Gas-assisted powder injection molding: A study on the effect of processing variables on gas penetration

Auteurs : Kyehwan Lee [États-Unis] ; Manuel De Hoyos [États-Unis] ; Seokyoung Ahn [États-Unis] ; Rajiv Nambiar [États-Unis] ; Miguel A. Gonzalez [États-Unis] ; Seong Jin Park [Corée du Sud] ; Randall M. German [États-Unis]

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Mots-clés :

Abstract

Parts of polypropylene and of a stainless steel powder feedstock were molded by means of gas-assisted injection molding in epoxy cavities made by stereolithography. The design of the experiment method using the Taguchi Lg array was implemented to test the effect of gas pressure, gas delay time, shot size and melt temperature on gas penetration depth and residual wall thickness. Simulations were conducted and compared with direct experimentation. Simulation predicted that the shot size was the only significant factor when processing polypropylene and the powder metal feedstock. The experiment showed that shot size and gas delay time were significant when processing polypropylene; and shot size, gas pressure, and melt temperature were significant factors when processing the powder metal feedstock. The residual wall thickness could not be controlled by the processing variables used in this study as the S/N ratios calculated were very small.


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<term>Delay time</term>
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<div type="abstract" xml:lang="en">Parts of polypropylene and of a stainless steel powder feedstock were molded by means of gas-assisted injection molding in epoxy cavities made by stereolithography. The design of the experiment method using the Taguchi Lg array was implemented to test the effect of gas pressure, gas delay time, shot size and melt temperature on gas penetration depth and residual wall thickness. Simulations were conducted and compared with direct experimentation. Simulation predicted that the shot size was the only significant factor when processing polypropylene and the powder metal feedstock. The experiment showed that shot size and gas delay time were significant when processing polypropylene; and shot size, gas pressure, and melt temperature were significant factors when processing the powder metal feedstock. The residual wall thickness could not be controlled by the processing variables used in this study as the S/N ratios calculated were very small.</div>
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