Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : surface roughness


Experimental Investigation on Electrochemical Grinding (ECG) for Stainless Steel 316

Abdullah J. Ghadban; Abbas F. Ibrahim

Engineering and Technology Journal, 2020, Volume 38, Issue 1, Pages 20-25
DOI: 10.30684/etj.2021.168171

This research focuses on material removal rate (MRR) and surface roughness during electrochemical grinding (ECG) for stainless steel 316. The effect of applied current, electrolyte concentration, gap size and spindle speed on machining performances has been studied. Where applied current used are (10, 20, 30, 40) A, electrolyte concentration used (100, 150, 200, 250) g/l, gap size used (0.2, 0.3, 0.4, 0.5) mm and spindle speed used (75, 150, 180, 280) rpm. Through the Taguchi design based experimental study the characteristic features of the ECG process are discussed. Where the maximum MRR can be obtained at 40 A of the current, 250 g/l of the concentration, 0.2 mm of the gap and 180 rpm of spindle speed. The best surface roughness can be obtained at 10 A of the current, 200 g/l of the concentration, 0.4 mm of the gap and 280 rpm of spindle speed..

Optimization of MRR and Surface Roughness for 7024 AL-alloy in EDM Process

M.M. Abdulrazaq; S.K. Ghazi

Engineering and Technology Journal, 2017, Volume 35, Issue 5, Pages 546-553

Electro discharge machining is major non-traditional operations for cutting the materials due to its suitability and benefits. The experimental work of this paper deals with electrico discharge machining (EDM). A system for machining in this process has been developed. Many parameters are studied such as current, time on and time off. Different current rates are used ranging from (30, 36 and 42) Amp, found that low current gives less material removal rates and good surface roughness. The results showing that maximum MRR is achieved (0.525) mm3/min when machining current (42), time on (150), and time off (50) while good surface roughness (2.11 μm) when machining current (30), time on (50), and time off (25).The level of importance of the machining parameters for surface roughness and material removal rate is determined by using Taguchi design experiments and analysis of variance (ANOVA).

Investigation of Material Removal Rate and Surface Roughness for AISI 1015 Steel Rack Gear in Wire EDM Process

Mostafa Adel Abdullah; Safaa Kadhim Ghazi; Mustafa Mohamed

Engineering and Technology Journal, 2016, Volume 34, Issue 12, Pages 2361-2370

In this work an investigation of the effects of various process parameters of Wire-EDM like Servo Feed (SF), pulse off-time (TOFF), pulse on-time (TON), as inputs impact on surface roughness (Ra) and metal removal rate (MRR) as outputs on steel (AISI 1015) utilizing nine specimens. With servo feed (500, 600 and 700)mm/min, pulse-of time (10,30,50) μsec, pulse on-time (20,25,30) μsec.The characteristics of cutting variables were determined by implementing Taguchi experimental design method. The importance level of the cutting variables for metal removal rate and surface roughnessis determined by implementing the analysis of variance (ANOVA).

Effect of Nano TiO2 Additives on Some Properties of Out Door Building Unites

Alaa A. Abdul-Hamead; Shatha R. Ahmed Izzat

Engineering and Technology Journal, 2016, Volume 34, Issue 13, Pages 2398-2405

In this paper a lower ratio of two powders; nano and micro titanium dioxide (TiO2) powder were used as additive in fabrication of mortar. Particle size of TiO2 powder were (80nm,1.6µm). These powders were used as additive to the mortar material (0.05, 0.1, 0.15 %) by cement weight in order to be used in construction application include layering building, and studies its effect on the mortar.
Inspections of the mortar specimens including optical microscope, surface roughness, micro hardness as well as x-ray diffraction (XRD).
Results demonstrate that surface roughness was diminished with augmentation of Nano TiO2powder added more than micro TiO2powder substances, while micro hardness was increased by raising the option of Nano TiO2powder to the mortar more than micro TiO2powder. Also, the mortar microstructure with the Nano TiO2 powder has been enhanced more than micro TiO2powder, with increment in CSH phase, which make the development of mortar with TiO2 Nano material useful and have a promising future in cutting edge development application.

Surface Modification of Red Brass Alloy by Using Laser Technique

Abdulhadi Kadhim; Inmar N.Ghazi; Amjed Razzaq.Hussein

Engineering and Technology Journal, 2016, Volume 34, Issue 7, Pages 1439-1444

Laser shock processing technique was performed on red brass alloy type C83300 specimens for the purpose ofstudy its effect on the mechanical properties such as micro-hardness and surface roughness. LSP experimental setup system involved Q-switched Nd:YaG laser of wavelength of 1064nm and 10 ns laser pulse . Double distilled deionized water (DDDW) is used as the transparent confining layer. The effects of the LSP parameters as laser pulse energy, number of laser pulses and thickness of confinement layer on the surface micro-hardness, and surface roughness were investigated. The experimental results show that, the surface roughness and micro-hardness values increased when the laser parameters (mentioned above) have been increased and the maximum value of micro-hardness generated near the surface due to LSP. The optimum thickness of DDDW layer was 4mm. After this thickness (4mm) ,the results of microhardness and surface roughness are reduced due to the absorption of laser pulse energy by the confinement layer .

A Study of the Effect of (Cutting Speed, Feed Rate and depth of cut) on Surface Roughness in the Milling Machining

Ahmed Basil Abdulwahhab

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1785-1797

The purpose of this research is to investigate the effect of the main factor of the surface roughness in aluminum alloy (Al-2024) as a workpiece and face milling machining by using computer numerical controlled milling machine with 50 millimeter diameters of the tool with triple cutting edges of carbides. The controlled factors were the speed, feed rate and the depth of cut and this factors effect on the surface roughness. The result of the tests showed that the surface roughness was likely to reduce when the cutting speed increase. It is found the surface roughness is increase with increasing both of feed rate and depth of cut. then drawing a charts illustrate the relationship between variables (cutting speed, feed rate and depth of cut) with surface roughness and analysis resulting data by utilizing the SPSS software to predicted surface roughness by using milling machining parameters and graphical analysis of the obtained data, The percentage of accuracy was 96%.

Effect of Surface Roughness and Shot Peening Treatments on The Mechanical Properties of Aluminum Alloy 2024 – T4

Alalkawi H. J. M; Ameer Tofan Shafiq; Mohammed khalouk al-azzawi

Engineering and Technology Journal, 2014, Volume 32, Issue 10, Pages 2386-2393

The objective of the present paper is to investigate the effect of surface roughness on mechanical properties of aluminum alloy 2024-T4. This paper describes the effect of surface roughness at values of ( 0.1 , 3.5 , 8 ) μm on hardness and yield strength and also estimate the effect of shot peening on the yield strength at period time of ( 5 , 10 , 15 , 20 , 25 ) min. The obtained results show that the low roughness improved the mechanical properties by 15.7% and also the low roughness is better than the shot peening treatments by 5.3% because the low roughness make surface more coherent. Empirical equations are formulated based on the experimental results to evaluate the yield strength with the surface roughness and the hardness.

Sy= 394.3 ( Ra + 1.35 ) -0.1356
Sy = 1 / 2.2227(10)-2 - 1.32(10)-4 HV

Experimental Study of the Effect of Shot Peening on Elevated Temperature Fatigue Behavior of 7075-T651 Al. alloy

Hussain J. Al-Alkawi; Shakir Sakran Hassan; Salah F. Abd-El-Jabbar

Engineering and Technology Journal, 2013, Volume 31, Issue 3, Pages 416-433

There is a general interest in increasing the fatigue life of materials. Shot peening is the process commonly used in order to increase the fatigue strength and life of 7075-T651. The effect of a combination of processes, fatigue-creep interaction and shot peening has not been thoroughly investigated so far. The aim of the present investigation was whether further improvements can be achieved by a comb/*ination of the two treatments. Two level experiments (cumulative fatigue damage programe) were used in order to determine the optimal set of process. It was found that the combination of shot peening and fatigue-creep interaction could be applied successfully in order to increase fatigue life for some specimens. Results of variable loading test clearly indicate that Miner rule does not give accurate and reliable predictions on fatigue lives.

Influence of Currents Density and Gap Size on Metal Removal Rate and Surface Roughness in Electrochemical Machining (ECM)

Hiba Husien Alwan; Saad kariem Shather

Engineering and Technology Journal, 2012, Volume 30, Issue 10, Pages 1783-1796

Electrochemical machining one of non traditional method which is used to
machine a complex shape such as that uses the chemical reaction associated with
electric current to remove metals. In this study the ECM was used to remove the
metals from the internal hole of the workpiece (medium carbon steel) by immersing it
in electrolyte (250g of NaCl for every litter of H2O) with tool is made of brass.
The,m research focuses on the effect of the change in gap dimensions and the
currents density on the metal removal rate (MRR) and surface roughness of the
workpiece the results obtained show that increasing of gap size between the tool and
the workpiece from (1 to 3mm) leads to increase the surface roughness (46%) and
while the material removal rate (MRR) decreases (16%) at a current density (2.856
Amp/cm2). Also increasing of the current density from (2.4485 to 3.6728 Amp/cm2),
the surface roughness of the workpiece decreases (31%) while the Material Removal
Rate (MRR) increases (93.9%) at a gap size of (1mm).

Prediction of Metal Removal Rate and Surface Roughness in Electrochemical Machining (ECM)

Saad kariem Shather; Hiba Husien Alwan

Engineering and Technology Journal, 2012, Volume 30, Issue 8, Pages 1415-1427

Electrochemical Machining (ECM) is a relatively important method of removing
metal by anodic dissolution. In this research the ECM was used to remove the metals
from the internal hole of the workpiece.The tool used was made from brass. This
research focuses on the parameters of the change in gap size, the change in current
density, and the change of the tool roughness on the Material Removal Rate (MRR),
and Surface Roughness of the workpiece. The Statistical Package for Social Science
(SPSS) software was used to predict the results. It was found that for the surface
roughness the coefficient of determination of the prediction was (0.982) and the
accuracy of prediction (97.15%). For the Material Removal Rate in (g/sec) units the
coefficient of determination of predicts was (0.991) with accuracy of prediction
(98.29%).

Influence of Cutter Width on Surface Roughness and Cutter Run Out During Horizontal Milling Operation

Saad Kareem Sather; Mohammad Naeem Houshi

Engineering and Technology Journal, 2010, Volume 28, Issue 24, Pages 6872-6887

This work focuses on studying the effect of cutter width on the surface roughness and cutter run out during horizontal milling operation, since the contact width in milling operations depends on the cutter geometry, especially (cutter diameter and width). So, three types of helical plain cutters with different widths are taken, (40,63,80mm), used in horizontal milling , when other cutter geometry parameters are
constant. As for workpiece material, it was from (structural steel (1.0402)) according to (DIN:C22) specifications, with different cutting conditions (spindle speed, feed rate, and depth of cut) for each cutter, results show that milling cutter, which has larger width (80mm), gives large surface roughness and cutter runout compared with
other two types. The results show that the surface roughness and cutter runout decrease with the increase of spindle speed under constant feed rate and depth of cut. While surface roughness and cutter runout increase with increase of feed rate for constant spindle speed and depth of cut .Both the results of fixing spindle speed and
feed rate with changing depth of cut show that surface roughness and cutter runout increase with the increase of depth of cut .In addition, cutter runout has a large effect on the surface roughness because it causes an increase in surface roughness of workpiece. Also surface roughness decreases at cutter (80mm width) which causes larger surface roughness than cutters (63mm and 40mm width),. For certain machining parameter as the spindle speed increases from (100 to 210 rpm), feed rate (35 mm/min) and depth of cut (0.1mm), the surface roughness value decreases from (1.61333 to 1.418333) μm at cutter (80mm width.) .When the cutter (63mm width) is used, the surface roughness decreases from (1.5222 to 1.3182) μm , and at cutter (40mm width) the surface roughness decreases from (1.4111 to 1.212) μm. Also in this study, multiple linear regression model is used within (SPSS) software to predict the experimental data for each surface roughness and cutter runout for different three cutters and results show from comparing between predicted and measured values that (SPSS) software gives high prediction accurate .

Prediction of Surface Roughness In Ceramic Cutting Tool Using SPSS Model

Saad Kariem Shather

Engineering and Technology Journal, 2010, Volume 28, Issue 4, Pages 759-767

The aim of this study is to predict surface roughness of workpiece which
machined by ceramic cutting tool using SPSS program and compare the results
with the experimental values which performed under different cutting
conditions.Cutting speed (60,80, 90,100,110 m/min ) and feed rate ( 0.1, 0.08, 0.3,
mm/rev ) and depth of cut ( 0.25, 0.5 ,0.7mm ) . Experiments were conducted to
predict the surface roughness of workpiece , the estimated result shows that there
is good greement between average experiments values such as Ra ( 1.27,0.92 )
and predicted values of Ra ( 1.2024, 0.8254 ) and Ra (2.15 ) also value ( 2.2774 )
and experimental values of Ra ( 2.51, 1.78 ).

Aِ studing The Effect of Chemical Composition of Workpiece on Built Up Edge Formation And Surface Roughness

Saad kariem shather

Engineering and Technology Journal, 2009, Volume 27, Issue 10, Pages 2061-2071

the phenomena built-up edge was the unwanted rough edge on cutting tool that is created by workpiece material welding onto the tool during cutting , occurs at the chip/tool interface when multiple materials are machined at low cutting speeds under high compressive stresses, this study involve relation between the chemical composition of workpiece and the built-up edge ( B.U.E ) formation which is generated on cutting tool during machining at dfferent types of low carbon steel
using turning machine , experments prove that increasing percentage of carbon on workpiece causes reduction in weight of cutting tool from ( 14.532g to 13.823g ) at cutting speed 40 m/min and 0.10% and 014% carbon also to 12.672g at 0.20% carbon because built – up edge was disappear and surface roughness was improving from the value ( 5.43μm ) at 0.10% carbon and to ( 3.362 μm ) at 0.14% carbon and to (3.543μm) at 0.20% carbon .