Papers by SITI AISHAH ADAM
International Review of Mechanical Engineering (IREME), 2015
The common problems that faced during machining process are high cost due to increase tool wear, ... more The common problems that faced during machining process are high cost due to increase tool wear, reduced quality of product due to poor surface finish and widely use of mineral and synthetic oils as metal working fluids that are recognized as harmful to both environment and health of the machine operator. Vegetable oil is renewable oil that possesses good biodegradability and lubricating ability which has potential to replace synthetic oil and mineral oil as environmental friendly cutting fluid if proper researches have been conducted. The aim of this experimental study is to determine and optimize the best additive to be added to the vegetable oil to improve its machinability. Types of additives selected in this experimental study are Propyl Gallate (PG), Boric Acid (BA) and Polydimethylsiloxane (PDMS). The experimental study uses a Taguchi design methodology in designing the experiment. Three different factors at three different levels are selected to conduct the experiment such as feed rate (mm/rev), cutting speed (m/min) and depth of cut (mm). The effect of tool wear and surface roughness during turning of mild steel (AISI 1040) were statistically evaluated using wear area analysis method and analysis of variance (ANOVA) method, respectively. It is observed that sunflower oil added with 3% Boric Acid is the most effective cutting fluid to reduce the tool wear while sunflower oil added with 3% Propyl Gallate is the most effective cutting fluid to reduce the surface roughness.
The purpose of this project research is focused on the study of surface roughness and chip format... more The purpose of this project research is focused on the study of surface roughness and chip formation during milling operation of Mild S teel using vegetable based oil as a lubricant. Experimental set up designed by using milling machine. Taguchi Method of Orthogonal Array with factorial design of experiments used to analysis the response. S urface roughness and chip formation predicting models was developed by using experimental data and analysis of the present lubricant and vegetables based oil. In the development of predictive models, cutting parameters of cutting v elocity, feed rate, and depth of cut were considered as model variables. Further, the Analysis of Variance (ANOVA) technique was used to analyze the influence of process parameters and their interaction during machining. From the analysis, it is observed t hat cutting speed is the most significant factor on the surface roughness followed by depth of cut and feed rate. While S unflower Oil gives the lowest surface rough...
International Review of Mechanical Engineering
The study was focused on surface roughness and tool wear during turning operation of Stainless St... more The study was focused on surface roughness and tool wear during turning operation of Stainless Steel using vegetable oil as a lubricant. Taguchi method and Analysis of Variance (ANOVA) have been applied to optimize surface roughness, Ra and tool wear, Vb in turning operation. An Orthogonal Array of L4 (2³) was used. Then ANOVA analyses were carried out to identify the significant factors affecting surface roughness, Ra and tool wear, Vb, and determined the optimal cutting combination design by seeking the responses and signal-to-noise ratio. Finally, the confirmations run can optimize the optimal parameter and cutting fluid for surface roughness and tool wear.
Applied Mechanics and Materials, 2014
Milling is a common machining process with high cutting speed and material removal rate. High cut... more Milling is a common machining process with high cutting speed and material removal rate. High cutting speed tends to generate heat at the interface between tool and workpiece. This may reduce the surface quality of the workpiece and reduce the tool life. The application of conventional cutting fluid to reduce friction and heat between tool and workpiece may produce numerous environmental problems. The vegetable-based lubricant as an alternative for measuring the effect on surface quality during milling operation is studied. The relation between machining parameters such as spindle speed, feed rate, depth of cut and lubricants is analyzed by using Analysis of Variance (ANOVA) and Response Surface Methodology (RSM). The optimization of surface quality is analyzed by using Box-Behnken Design of RSM. The research focused on using sunflower oil as lubricant during machining process using mild steel solid block with TiCN coated HSS tools and using synthetic oil as comparison. Surface roug...
Assembly Automation, 2012
Purpose-The purpose of this paper is to investigate the process of jamming of the hollow parts on... more Purpose-The purpose of this paper is to investigate the process of jamming of the hollow parts on the shaft and to derive a mathematical model for jamming in an assembly process. Design/methodology/approach-The mathematical model for jamming of parts on the shaft in an assembly process is based on the sizes, geometry, angular declination of part and shaft axes, and the frictional factor. Findings-The equation for angular positional tolerance of coaxial parts and shafts, based on their geometry and sizes and leading to jamming, was derived. Research limitations/implications-A mathematical model of parts jamming on the shaft is developed for assembly mechanisms. This research does not consider flexible deformations of components in assembly mechanisms, which results in the axis concentricity of part and shaft in the assembly process. Practical implications-The results presented in the form of angular positional tolerance for coaxial parts and shafts based on their geometry and sizes make it possible to avoid the jamming of the parts. The results allow for formulating the angular positional tolerance of the assembly mechanisms that clamp the parts. Originality/value-The proposed method for calculating the angular positional tolerance of coaxial parts and shafts for the assembly process should allow for increasing the reliability of the assembly process in the manufacturing industry.
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Papers by SITI AISHAH ADAM