000			03099ntm a2200289 a 4500
001			vtls000098091
003			KUKTEM
005			20251117113338.0
008			161107t2016 my a f abm 000 0 eng d
020			_aTHE0005420(Local)
039		9	_a201905151504 _bhanafiah _c201710091631 _daishah _c201611071551 _dsaini _y201611071543 _zsaini
040			_aUMP
090			_aFKP .S93 2016 r Thesis
100	0		_aMohamad Syahmi Shahrom
245	1	0	_aDirect recycling of aluminium alloy 6061 and 7075 employing cyclic extrusion compression back pressure technique / _cMohamad Syahmi Shahrom
260			_aKuantan, Pahang : _bUMP, _c2016
300			_axiii, 128 p. : _bill. (some col.) ; _c30 cm. + _e1 CD-ROM
500			_aFaculty of Manufacturing Engineering
502			_aThesis (Master of Science) -- Universiti Malaysia Pahang – 2016
504			_aBibliography: p. 111-115
520			_aThe 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.
610	2	0	_aFaculty of Manufacturing Engineering _xDissertations
650		0	_aUniversities and Colleges _xDissertations
650		0	_aTheses
856	4	0	_uhttp://ecollib.ump.edu.my/24312/ _zLibrary access only
999			_aVIRTUA40 _c7108 _d7114
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