Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber

Quality properties of castings produced in a die casting process correlate with porosity that is conditioned by a number of factors, which range from input melt quality to setup of technological factors of the die casting, and through structural design of the gating system. One of the primary parame...

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Autores principales:	Štefan Gašpár, Ján Majerník, Jan Kolínský
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	HPDC porosity air entrapment aluminium alloys gating system Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/31976534bd404924a9835f2e7ee89ea6
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spelling	oai:doaj.org-article:31976534bd404924a9835f2e7ee89ea62021-11-25T18:13:57ZAnalysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber10.3390/ma142268271996-1944https://doaj.org/article/31976534bd404924a9835f2e7ee89ea62021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6827https://doaj.org/toc/1996-1944Quality properties of castings produced in a die casting process correlate with porosity that is conditioned by a number of factors, which range from input melt quality to setup of technological factors of the die casting, and through structural design of the gating system. One of the primary parameters conditioning the inner soundness of the casting is the liquid metal dose per single operation of die casting. This paper examines the issue of metal dose. The experiments are performed with casting a gate system of an electromotor flange. The gating system examined was die cast with a variable volume of metal dose per single operation. The metal dose was adjusted to reach the height of a biscuit of 10, 20, and 30 mm. The examination of the inner homogeneity of the castings of the individual variants of gating systems with variable height of the biscuit proved that decreasing biscuit height results in an increase of porosity share in the casting volume. The programme MagmaSoft 5.4 revealed the main causes of changes in porosity share. The simulations detected that the change in biscuit height and volume of liquid metal directly influence thermal conditions of the melt in the filling chamber, and in the mould by means of the period in which the holding pressure action is influenced. Simultaneously, the melt flow mode in the sprues and gas entrapment in the melt volume are affected as well. Correlation of the factors consequently influences the final porosity of castings.Štefan GašpárJán MajerníkJan KolínskýMDPI AGarticleHPDCporosityair entrapmentaluminium alloysgating systemTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6827, p 6827 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	HPDC porosity air entrapment aluminium alloys gating system Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	HPDC porosity air entrapment aluminium alloys gating system Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Štefan Gašpár Ján Majerník Jan Kolínský Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber
description	Quality properties of castings produced in a die casting process correlate with porosity that is conditioned by a number of factors, which range from input melt quality to setup of technological factors of the die casting, and through structural design of the gating system. One of the primary parameters conditioning the inner soundness of the casting is the liquid metal dose per single operation of die casting. This paper examines the issue of metal dose. The experiments are performed with casting a gate system of an electromotor flange. The gating system examined was die cast with a variable volume of metal dose per single operation. The metal dose was adjusted to reach the height of a biscuit of 10, 20, and 30 mm. The examination of the inner homogeneity of the castings of the individual variants of gating systems with variable height of the biscuit proved that decreasing biscuit height results in an increase of porosity share in the casting volume. The programme MagmaSoft 5.4 revealed the main causes of changes in porosity share. The simulations detected that the change in biscuit height and volume of liquid metal directly influence thermal conditions of the melt in the filling chamber, and in the mould by means of the period in which the holding pressure action is influenced. Simultaneously, the melt flow mode in the sprues and gas entrapment in the melt volume are affected as well. Correlation of the factors consequently influences the final porosity of castings.
format	article
author	Štefan Gašpár Ján Majerník Jan Kolínský
author_facet	Štefan Gašpár Ján Majerník Jan Kolínský
author_sort	Štefan Gašpár
title	Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber
title_short	Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber
title_full	Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber
title_fullStr	Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber
title_full_unstemmed	Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber
title_sort	analysis of causes of porosity change of castings under the influence of variable biscuit height in the filling chamber
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/31976534bd404924a9835f2e7ee89ea6
work_keys_str_mv	AT stefangaspar analysisofcausesofporositychangeofcastingsundertheinfluenceofvariablebiscuitheightinthefillingchamber AT janmajernik analysisofcausesofporositychangeofcastingsundertheinfluenceofvariablebiscuitheightinthefillingchamber AT jankolinsky analysisofcausesofporositychangeofcastingsundertheinfluenceofvariablebiscuitheightinthefillingchamber
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Analysis of Causes of Porosity Change of Castings under the Influence of Variable Biscuit Height in the Filling Chamber

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