000			02890nam a2200253 a 4500
001			vtls000040342
003			KUKTEM
005			20251114204405.0
008			090714t2008 my a f m 000 0 eng d
020			_aTHE0005786(Local)
039		9	_a201905131247 _baida _c201107132153 _dVLOAD _c200908141648 _dVLOAD _c200908141627 _dVLOAD _y200907141726 _zkam
040			_aUMP
090			_aTA418.7 .S53 2008 rs Bc.
100	0		_aNurul Shazwani Mehat
245	1	0	_aEffect of machining parameters on surface textures in wire electro discharge machining of aisi 4140 steel / _cNurul Shazwani Binti Mehat
246	3		_aEffect of machining parameters on surface textures in wire electro discharge machining of aisi 4140 steel _h[electronic resource]
260			_aKuantan, Pahang : _bUMP, _c2008
300			_a43 p. : _bill. (some col.) ; _c30 cm. + _e1 computer disc
502			_aProject paper (Bachelor of Mechanical Engineering) -- Universiti Malaysia Pahang - 2008
520	3		_aThe Wire Electro Discharge Machining (WEDM) process is a violent thermal process where literally thousands of electrical discharges are produced in a fraction of a second in order to erode a certain volume of metal. The process is most used in situations where intricate complex shapes need to be machined in very hard materials (such as hardened tool steel). However, the process generates surface that have poor properties such as high tensile residual stresses, high surface roughness, presence of micro-cracks and micro-voids. These properties vary with different levels of the main machining parameters. The aim of this paper is to present experimental work that has been done in order to quantify the effect of some of the main WEDM parameters on the surface texture. 2D surface measurements were taken on all WEDM samples and 2D surface characterization has been carried out in order to calculate the different surface texture parameters. In this work, the surface characteristics caused by WEDM were analyzed by Scanning Electron Microscopy (SEM). An empirical model of AISI 4140 steel was proposed based on the experimental data. Surface roughness was determined with a ‘Perthometer’ recorder. Experimental results indicate that the WEDM process causes a ridged surface and induces machining damage in the surface layer and increases the surface roughness. The depth of micro-cracks and micro-voids increases with an increase in the amount of pulsed current and pulse-on duration. The effect of the magnitude of the pulse-on duration on the surface texture of the specimen is more significant than the pulsed current. Furthermore, the SEM reveals the two-dimensional image of surface textures of the WEDM specimen with a nanometer scale.
650		0	_aSurface roughness
650		0	_aSurface (Technology)
999			_aVIRTUA40 _c1216 _d1222
999			_aVTLSSORT0080*0200*0400*0900*1000*2450*2460*2600*3000*5020*5200*6500*6501*9992