Influences of temperature and pressure to the green defects

Research output: Contribution to journalArticle

Abstract

Metal injection moulding has been recognised as a useful technique to produce the parts with high complexity. In this study, an experimental run was carried out to identify the influence of injections parameters on the green defects. The parameters investigated are injection temperature, injection pressure and mould temperature. Experimental tests were conducted on water atomised stainless steel feedstock with 62 vol% powder. Multi-component binder consisting PEG, PMMA and strearic acid were used. The standardise tensile-test specimen were injection moulded by varying the injections parameters. Injection moulding was carried out at temperatures and pressures of 140–160°C and 550–750 bar respectively. The feedstocks prepared exhibit pseudo-plastic behaviour. The experimental results showed that the flashing and binder separations are the major defects. These defects are caused by the high injection temperature and high injection pressure. At the low mould temperature, the defects such as distortions and cracking were observed. From the surface defects point of view, the injection temperature of 150 °C, the mould temperature of 70 °C and injection pressure of 550 bars seem to be the most suitable condition for injection moulding.

Original languageEnglish
Pages (from-to)186-192
Number of pages7
JournalInternational Journal of Mechanical Engineering and Technology
Issue number1
Publication statusPublished - 1 Jan 2019

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Defects
Injection molding
Temperature
Feedstocks
Binders
Metal molding
Surface defects
Polyethylene glycols
Stainless steel
Plastics
Powders
Acids
Water

Keywords

  • Green defects
  • Injection pressure
  • Injection temperature
  • Metal injection moulding
  • Mould temperature

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "Metal injection moulding has been recognised as a useful technique to produce the parts with high complexity. In this study, an experimental run was carried out to identify the influence of injections parameters on the green defects. The parameters investigated are injection temperature, injection pressure and mould temperature. Experimental tests were conducted on water atomised stainless steel feedstock with 62 vol{\%} powder. Multi-component binder consisting PEG, PMMA and strearic acid were used. The standardise tensile-test specimen were injection moulded by varying the injections parameters. Injection moulding was carried out at temperatures and pressures of 140–160°C and 550–750 bar respectively. The feedstocks prepared exhibit pseudo-plastic behaviour. The experimental results showed that the flashing and binder separations are the major defects. These defects are caused by the high injection temperature and high injection pressure. At the low mould temperature, the defects such as distortions and cracking were observed. From the surface defects point of view, the injection temperature of 150 °C, the mould temperature of 70 °C and injection pressure of 550 bars seem to be the most suitable condition for injection moulding.",
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N2 - Metal injection moulding has been recognised as a useful technique to produce the parts with high complexity. In this study, an experimental run was carried out to identify the influence of injections parameters on the green defects. The parameters investigated are injection temperature, injection pressure and mould temperature. Experimental tests were conducted on water atomised stainless steel feedstock with 62 vol% powder. Multi-component binder consisting PEG, PMMA and strearic acid were used. The standardise tensile-test specimen were injection moulded by varying the injections parameters. Injection moulding was carried out at temperatures and pressures of 140–160°C and 550–750 bar respectively. The feedstocks prepared exhibit pseudo-plastic behaviour. The experimental results showed that the flashing and binder separations are the major defects. These defects are caused by the high injection temperature and high injection pressure. At the low mould temperature, the defects such as distortions and cracking were observed. From the surface defects point of view, the injection temperature of 150 °C, the mould temperature of 70 °C and injection pressure of 550 bars seem to be the most suitable condition for injection moulding.

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