Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique

The direct recycling process is an alternative method of recycling waste of chip aluminium without melting the materials as compared to conventional recycling technique (secondary production). The cold compaction stage is the most crucial process of the direct recycling process. The billets density,...

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Main Author:	Mohamad Syahmi, Shahrom
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Q Science (General) TS Manufactures
Online Access:	http://umpir.ump.edu.my/id/eprint/16389/19/Direct%20recycling%20of%20aluminium%20alloy%206061%20and%207075%20employing%20cyclic%20extrusion%20compression%20back%20pressure%20technique.pdf
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id	my-ump-ir.16389
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spelling	my-ump-ir.163892022-01-05T02:37:34Z Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique 2016-06 Mohamad Syahmi, Shahrom Q Science (General) TS Manufactures The direct recycling process is an alternative method of recycling waste of chip aluminium without melting the materials as compared to conventional recycling technique (secondary production). The cold compaction stage is the most crucial process of the direct recycling process. The billets density, b achieved through the cold compaction stage significantly influences the hardness (mechanical properties) and chip boundaries (microstructural properties). The problem of conventional compaction (direct compaction) presents low of b. The objective of this study is to develop the Cyclic Extrusion Compression Back Pressure (CECBP) technique to improve the b which influences the hardness and chip boundaries of aluminium alloy 6061 and 7075 chips in the direct recycling process. Taguchi Method was used as a tool to analyse and optimise the CECBP factors namely the pressure, P back pressure, Pb cycle time, tc and holding time, th. Different lubricant strategy techniques (flood, dry and minimum quantity lubricant (MQL) were used to obtain different types of aluminium chips. Conventional compaction (direct compaction technique) was used to get b value. The MQL showed the highest b results compared to flood and dry technique. The experimental results suggested that the CECBP technique is able to improve cyclic billets density cyb to 12.11% (AA6061) and 5.45 % (AA7075) compared to direct compaction technique. It is also established that the cyclic specimen hardness, Hcys and chip boundaries for both aluminium alloys improved when cyb value increased by using regression analysis. Pressure is identified to be the most significant factor in influencing the properties of cyb, cys and Hcys. In conclusion, CECBP technique had successfully improved the cold compaction stage for a direct recycling process and can used as direct recycling process of aluminium in industry. 2016-06 Thesis http://umpir.ump.edu.my/id/eprint/16389/ http://umpir.ump.edu.my/id/eprint/16389/19/Direct%20recycling%20of%20aluminium%20alloy%206061%20and%207075%20employing%20cyclic%20extrusion%20compression%20back%20pressure%20technique.pdf pdf en public masters Universiti Malaysia Pahang Faculty of Manufacturing Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	Q Science (General) TS Manufactures
spellingShingle	Q Science (General) TS Manufactures Mohamad Syahmi, Shahrom Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
description	The direct recycling process is an alternative method of recycling waste of chip aluminium without melting the materials as compared to conventional recycling technique (secondary production). The cold compaction stage is the most crucial process of the direct recycling process. The billets density, b achieved through the cold compaction stage significantly influences the hardness (mechanical properties) and chip boundaries (microstructural properties). The problem of conventional compaction (direct compaction) presents low of b. The objective of this study is to develop the Cyclic Extrusion Compression Back Pressure (CECBP) technique to improve the b which influences the hardness and chip boundaries of aluminium alloy 6061 and 7075 chips in the direct recycling process. Taguchi Method was used as a tool to analyse and optimise the CECBP factors namely the pressure, P back pressure, Pb cycle time, tc and holding time, th. Different lubricant strategy techniques (flood, dry and minimum quantity lubricant (MQL) were used to obtain different types of aluminium chips. Conventional compaction (direct compaction technique) was used to get b value. The MQL showed the highest b results compared to flood and dry technique. The experimental results suggested that the CECBP technique is able to improve cyclic billets density cyb to 12.11% (AA6061) and 5.45 % (AA7075) compared to direct compaction technique. It is also established that the cyclic specimen hardness, Hcys and chip boundaries for both aluminium alloys improved when cyb value increased by using regression analysis. Pressure is identified to be the most significant factor in influencing the properties of cyb, cys and Hcys. In conclusion, CECBP technique had successfully improved the cold compaction stage for a direct recycling process and can used as direct recycling process of aluminium in industry.
format	Thesis
qualification_level	Master's degree
author	Mohamad Syahmi, Shahrom
author_facet	Mohamad Syahmi, Shahrom
author_sort	Mohamad Syahmi, Shahrom
title	Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
title_short	Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
title_full	Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
title_fullStr	Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
title_full_unstemmed	Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
title_sort	direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Manufacturing Engineering
publishDate	2016
url	http://umpir.ump.edu.my/id/eprint/16389/19/Direct%20recycling%20of%20aluminium%20alloy%206061%20and%207075%20employing%20cyclic%20extrusion%20compression%20back%20pressure%20technique.pdf
_version_	1783732011517607936

Direct recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique

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