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High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions

Matthew Tucker, Christian Griffiths, Andrew Rees, Gethin Llewellyn

Micromachines, Volume: 11, Issue: 4, Start page: 358

Swansea University Authors: Christian Griffiths, Andrew Rees, Gethin Llewellyn

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DOI (Published version): 10.3390/mi11040358

Abstract

Micro-injection moulding (µ-IM) is a fabrication method that is used to produce miniature parts on a mass production scale. This work investigates how the process parameter settings result in adiabatic heating from gas trapped and rapidly compressed within the mould cavity. The heating of the reside...

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Published in: Micromachines
ISSN: 2072-666X
Published: MDPI AG 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53889
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first_indexed 2020-03-30T20:17:47Z
last_indexed 2020-10-23T03:06:17Z
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spelling 2020-10-22T13:31:20.2191014 v2 53889 2020-03-30 High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions 84c202c256a2950fbc52314df6ec4914 Christian Griffiths Christian Griffiths true false e43e88c74976e714e1d669a898f8470d Andrew Rees Andrew Rees true false 7454b3dde334f8d8876851bc894bea29 Gethin Llewellyn Gethin Llewellyn true false 2020-03-30 GENG Micro-injection moulding (µ-IM) is a fabrication method that is used to produce miniature parts on a mass production scale. This work investigates how the process parameter settings result in adiabatic heating from gas trapped and rapidly compressed within the mould cavity. The heating of the resident air can result in the diesel effect within the cavity and this can degrade the polymer part in production and lead to damage of the mould. The study uses Autodesk Moldflow to simulate the process and identify accurate boundary conditions to be used in a gas law model to generate an informed prediction of temperatures within the moulding cavity. The results are then compared to physical experiments using the same processing parameters. Findings from the study show that without venting extreme temperature conditions can be present during the filling stage of the process and that venting solutions should be considered when using µ-IM. Journal Article Micromachines 11 4 358 MDPI AG 2072-666X micro injection moulding; adiabatic heating; diesel effect; venting 30 3 2020 2020-03-30 10.3390/mi11040358 COLLEGE NANME General Engineering COLLEGE CODE GENG Swansea University 2020-10-22T13:31:20.2191014 2020-03-30T16:17:23.8726418 College of Engineering Engineering Matthew Tucker 1 Christian Griffiths 2 Andrew Rees 3 Gethin Llewellyn 4 53889__16979__3411006f08294738b860e2224ed2f53f.pdf 53889.pdf 2020-03-30T16:20:03.7759385 Output 999520 application/pdf Version of Record true This is an open access article distributed under the Creative Commons Attribution License (CC-BY). true eng https://creativecommons.org/licenses/by/4.0/
title High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
spellingShingle High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
Christian Griffiths
Andrew Rees
Gethin Llewellyn
title_short High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
title_full High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
title_fullStr High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
title_full_unstemmed High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
title_sort High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions
author_id_str_mv 84c202c256a2950fbc52314df6ec4914
e43e88c74976e714e1d669a898f8470d
7454b3dde334f8d8876851bc894bea29
author_id_fullname_str_mv 84c202c256a2950fbc52314df6ec4914_***_Christian Griffiths
e43e88c74976e714e1d669a898f8470d_***_Andrew Rees
7454b3dde334f8d8876851bc894bea29_***_Gethin Llewellyn
author Christian Griffiths
Andrew Rees
Gethin Llewellyn
author2 Matthew Tucker
Christian Griffiths
Andrew Rees
Gethin Llewellyn
format Journal article
container_title Micromachines
container_volume 11
container_issue 4
container_start_page 358
publishDate 2020
institution Swansea University
issn 2072-666X
doi_str_mv 10.3390/mi11040358
publisher MDPI AG
college_str College of Engineering
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hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description Micro-injection moulding (µ-IM) is a fabrication method that is used to produce miniature parts on a mass production scale. This work investigates how the process parameter settings result in adiabatic heating from gas trapped and rapidly compressed within the mould cavity. The heating of the resident air can result in the diesel effect within the cavity and this can degrade the polymer part in production and lead to damage of the mould. The study uses Autodesk Moldflow to simulate the process and identify accurate boundary conditions to be used in a gas law model to generate an informed prediction of temperatures within the moulding cavity. The results are then compared to physical experiments using the same processing parameters. Findings from the study show that without venting extreme temperature conditions can be present during the filling stage of the process and that venting solutions should be considered when using µ-IM.
published_date 2020-03-30T04:08:19Z
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