Muhammad Riza | International Islamic University Malaysia (original) (raw)

Books by Muhammad Riza

Many research and development works have been carried out in the area of high speed turning. Cerm... more Many research and development works have been carried out in the area of high speed turning. Cermet tools have been employed for high speed machining for a long time due to their high wear resistance and high hot hardness. In the current work, research is focused on the analysis of wear behavior of cermets applying negative rake angles during high speed machining. In addition to that, cutting temperature is also integrated in this research due to its significant roles in high speed machining. Those facts and evidences have formed the rationale of this research. Hence, the aim of this research is to investigate performance of cermet tools applying negative rake angles during high speed machining.

Papers by Muhammad Riza

Transient multiexponential signals with real decay constants occurs in different areas of science... more Transient multiexponential signals with real decay constants occurs in different areas of science and technology. Such signals arise in deep-level transient spectroscopy, fluorescence decay analysis, NMR relaxation data, etc. Due to their nonorthogonality, their analysis has proved difficult using conventional signal processing techniques. Many techniques have been proposed by different researchers but they often produce mixed result. A new method of multiexponential transient signal analysis is hereby proposed and tested. The method based on cepstral deconvolution is fast and computationally inexpensive. The multiexponential signal is initially converted to a deconvolution model using Gardner transform after which the proposed method is used to deconvolve the data. Simulation and experimental results indicate that this method is good for determining the number of components but performs poorly in estimating the decay rates.

International Journal of Engineering Materials and Manufacture, 2016

Heat produced at the tool-chip interface during high speed milling operations have been known as ... more Heat produced at the tool-chip interface during high speed milling operations have been known as a significant factor that affect to tool life and workpiece geometry or properties. This paper aims to investigate cutting temperature behaviours of AISI H13 (48 HRC) under high speed machining circumstances during pocketing. The experiments were conducted on CNC vertical machining centre by using PVD coated carbide insert. Milling processes were done at cutting speeds 150, 200 and 250 m/min and feed rate were 0.05, 0.1 and 0.15 mm/tooth. Depths of cut applied were 0.1, 0.15 and 0.2 mm. Tool path method applied in this experiment was contour in. Results presented in this paper indicate that by increasing cutting speed the cutting temperature is lower than low cutting speed. However, by decreasing feed rate leads to cutting temperature low. Cutting temperature phenomena at the corner of pocket milling were also investigated. The phenomena showed that cutting temperature tends to decrease ...

Cat adalah cairan yang berfungsi untuk melindungi, memperkuat, dan memperindah. Pada proses penge... more Cat adalah cairan yang berfungsi untuk melindungi, memperkuat, dan memperindah. Pada proses pengecatan menggunakan metode penyemprotan (spray) adalah yang paling cepat, tetapi harus mengetahui jarak dan tekanan angin yang sesuai agar tidak terbuang ke udara bebas. Memodifikasi diameter lubang nozzle spray gun dapat dilakukan sehingga dapat menambah efisiensi saat proses pengecatan menjadi lebih cepat, dan tebal. Tetapi saat memodifikasi lubang nozzle spray gun memiliki batas disetiap masing masing type spray gun dalam penelitian ini jenis spray gun yang digunakan adalah type F75 dengan diameter aslinya 1,5mm kemudian dimodifikasi menjadi 1,8mm dan 2mm. Pada type ini saat perluas lubang nozzle lebih dari 2mm Jarum spray gun tidak dapat menutup rapat lubang nozzle sehingga terjadi kebocoran angin pada nozzle dan spray gun tidak efektif. Jarak spray gun ke objek juga sangat mempengaruhi dari pengujian. Maka dapat disimpulkan semakin dekat jarak sprayer ke objek maka ketebalan cat menin...

Engineering Innovations, 2022

We investigate the characteristics of polycrystalline Silicon (poly-Si) thin films for solar cell... more We investigate the characteristics of polycrystalline Silicon (poly-Si) thin films for solar cells produced by very high frequency (VHF) plasma enhanced chemical vapor deposition using a conductive scanning probe microscope (SPM). We measure the surface morphology and local current images are simultaneously of the poly-Si layers with a thickness, d=2 mm, formed on textured Ag/SnO2/glass in the range of RMS based-textured substrate (a) s=85nm, (b) s=42nm and (c) s=2nm respectively. Influences of the substrate texture on the crystal growth as well as the local current flow are discussed. Where we found that the average of local current proportional with crystallinity, where the poly-Si layer that has rich crystallinity indicated low conductivity that yield high local current.

Engineering Innovations, 2022

Solid polymer electrolyte (SPE) produces hydrogen and oxygen from pure water uses electrochemical... more Solid polymer electrolyte (SPE) produces hydrogen and oxygen from pure water uses electrochemical reaction, and this process is believed to be the most promising and efficient way to produce hydrogen. For application and simulation, the electrical model of SPE is absolutely required, we intend to develop an electrical model. Where the model has been constructed based on the structure and characteristics of SPE. The electrical model of SPE battery like that consists of a voltage and resistance, that fulfil the equation v=1.936+ 0.0183I-0.013T, to ensure that this model is close to the character of the SPE, we conducted an experiment to validate it, based on the correlation analysis method we obtained those results of the experiment and results of calculation of the model have a correlation is > 0.9988, this meaning that the model is valid.

Bulletin of Electrical Engineering and Informatics, 2017

Tool wear prediction plays a significant role in machining industry for proper planning and contr... more Tool wear prediction plays a significant role in machining industry for proper planning and control machining parameters and optimization of cutting conditions. This paper aims to investigate the effect of tool path strategies that are contour-in and zigzag tool path strategies applied on tool wear during pocket milling process. The experiments were carried out on CNC vertical machining centre by involving PVD coated carbide inserts. Cutting speed, feed rate and depth of cut were set to vary. In an experiment with three factors at three levels, Response Surface Method (RSM) design of experiment with a standard called Central Composite Design (CCD) was employed. Results obtained indicate that tool wear increases significantly at higher range of feed per tooth compared to cutting speed and depth of cut. This result of this experimental work is then proven statistically by developing empirical model. The prediction model for the response variable of tool wear for contour-in strategy de...

IOP Conference Series: Materials Science and Engineering, 2018

Advanced Materials Research, 2012

Power consumption cost is one of the main integral parts of the total machining cost, but it has ... more Power consumption cost is one of the main integral parts of the total machining cost, but it has not given the proper attention when minimizing the machining cost. In this paper, the optimal machining parameters for continuous machining are determined with respect to the minimum power consumption cost with maintaining the surface roughness in the range of acceptance. The constraints considered in this research are cutting speed, feed rate, depth of cut and rake angle. Due to complexity of this machining optimization problem, a multi objective genetic algorithm (MOGA) was applied to resolve the problem, and the results have been analyzed.

Advanced Materials Research, 2012

Surface roughness affects the functional attributes of finished parts. Therefore, predicting the ... more Surface roughness affects the functional attributes of finished parts. Therefore, predicting the finish surface is important to select the cutting levels in order to reach the required quality. In this research an experimental investigation was conducted to predict the surface roughness in the finish end milling process with higher cutting speed. Twenty sets of data for finish end milling on AISI H13 at hardness of 48 HRC have been collected based on five-level of Central Composite Design (CCD). All the experiments done by using indexable tool holder Sandvick Coromill R490 and the insert was PVD coated TiAlN carbide. The experimental work performed to predict four different roughness parameters; arithmetic mean roughness (Ra), total roughness (Rt), mean depth of roughness (Rz) and the root mean square (Rq).

Cutting temperature and cutting force generated during high speed machining operations has been r... more Cutting temperature and cutting force generated during high speed machining operations has been recognized as major factors influence tool performance and workpiece geometry. This paper aims to investigate cutting temperature and cutting force behaviours when contour-in and zigzag tool path strategies applied in high speed end milling process. The experiments were carried out on CNC vertical machining center by involving PVD coated carbide inserts. Cutting speed, feed rate and depth of cut were set to vary. Results obtained indicate that cutting temperatures and cutting forces are high in the initial stage of milling and at the corners region or turning points region. Portion of radial depth of cut with workpiece in combination with the abrupt change of the milling path direction occur particularly in acute internal corners of a pocket leads to rise of cutting temperature and cutting force.

Determining of the effect of cutting parameters on cutting force and cutting temperature is parti... more Determining of the effect of cutting parameters on cutting force and cutting temperature is particularly important during machining operation. This is because these machining conditions influence the surface quality of machined parts as well as tool life of the cutter. Numerous studies have been conducted to investigate the effect of cutting parameters on machining output. However, most of the studies focussed on straight cutting only. In mould and die making process, end milling process is required to form an empty volume of the part. This is known as pocketing operation. Different from normal cutting, the tool needs to travel in various straight and corner cutting following a particular tool path strategy depending on the shape of the pocket. The situation causes variation in the cutting force as well as cutting temperature due to variation of tool engagement during the process. Hence, this study concentrates on investigating the effects of cutting parameters on cutting forces and...

IOP Conference Series: Materials Science and Engineering

Applied Mechanics and Materials, 2015

In machining operation of mould cavities, the tool travels in various straight and corner profile... more In machining operation of mould cavities, the tool travels in various straight and corner profiles following predetermined toolpath. Such condition results in a fluctuation of cutting forces that may produce bad surface finish. The objective of this study is to investigate the most influential parameters on cutting operation for both straight and corner profiles of pocketing operation. Cutting speeds of 150, 200 and 250m/min, feedrates from 0.05, 0.1, 0.15 mm/tooth and depths of cut of 0.1, 0.15 and 0.2 mm were selected for the cutting processes. Taguchi L9 orthogonal array with Pareto ANOVA analysis was employed to analyze the effects of the selected parameters. The result demonstrates there are different effects of cutting parameters on cutting forces for straight and corner profiles. Furthermore, it was found that cutting speed and feedrate are prevailing factors that affected cutting forces for both types of profile.

Advanced Materials Research, 2015

In pocketing operation for mold and die, the variation of tool engagement angle causes variation ... more In pocketing operation for mold and die, the variation of tool engagement angle causes variation in the cutting force and also cutting temperature. The objective of this study is to investigate the effect of tool engagement on cutting temperature when using the contour in tool path strategy for different cutting speeds. Cutting speeds of 150, 200 and 250m/min, feedrate from 0.05, 0.1, 0.15 mm/tooth and depths of cut of 0.1, 0.15 and 0.2 mm were applied for the cutting process. The result shows that by increasing cutting speed, the cutting temperature would rise. Varying the tool engagement also varied the cutting temperature. This can be seen clearly when the tool makes a 90o turn and along the corner region. Along the corner, the engagement angle varies accordingly with the radial depth of cut.

Advanced Materials Research, 2015

The aim of the present study is to investigate the influence of cutter engagement on cutting forc... more The aim of the present study is to investigate the influence of cutter engagement on cutting forces in end milling process of AISI H13 (48 HRc). The experiments were carried out on CNC vertical machining center. The machining conditions are as follows: Vc = 150, 200 and 250 m/min, fz = 0.05, 0.1 and 0.15 mm/tooth; a = 0.1, 0.15 and 0.2 mm for every cutting process. Central Composite Design with 20 runs was employed. Data analysis showed that cutter engagement influence the cutting force for the end milling process of hard material H13 in the same pattern to the similar experiment of different material. The present study of cutter engagement will be useful in tool path creation which is important for mold and die machining. The cutter engagement study related to cutting force in high speed end milling of AISI H13 has not yet been established. This study will help the NC programmers in choosing the suitable tool path that will give stable, productive, and more efficient milling process

Advanced Materials Research, 2015

Cutting temperature generated during high speed machining operations has been recognized as major... more Cutting temperature generated during high speed machining operations has been recognized as major factors influence tool performance and workpiece geometry. This paper aims to model the cutting temperature and to investigate cutting temperature behaviours when contour-in tool path strategy applied in high speed end milling process. The experiments were carried out on CNC vertical machining center by involving PVD coated carbide inserts. Cutting speed, feed rate and depth of cut were set to vary. Results obtained indicate that cutting temperature is high in the initial stage of milling and at the corners region or turning points region. Portion of radial width of cut with workpiece in combination with the abrupt change of the milling path direction occur particularly in acute internal corners of a pocket leads to rise of cutting temperature.

... accurate numbers. References 1. Aramcharoen, A. & PT Mativenga. (2008). White layer forma... more ... accurate numbers. References 1. Aramcharoen, A. & PT Mativenga. (2008). White layer formation and hardening effects in hard turning of H13 tool steel with CrTiAlN and CrTiAlN/MoST-coatedcarbide tools. International journal ...

International Journal of Engineering Materials and Manufacture, 2016

Engineering Innovations, 2022

Bulletin of Electrical Engineering and Informatics, 2017

IOP Conference Series: Materials Science and Engineering, 2018

Advanced Materials Research, 2012

IOP Conference Series: Materials Science and Engineering

Applied Mechanics and Materials, 2015

Advanced Materials Research, 2015

2012 International Conference on Advanced Computer Science Applications and Technologies (ACSAT), 2012

Machining of hard materials at high cutting speeds produces high temperatures in the cutting zone... more Machining of hard materials at high cutting speeds produces high temperatures in the cutting zone, which affects the surface quality. Thus, developing a model for estimating the cutting parameters and optimizing this model to minimize the cutting temperatures and surface roughness becomes utmost important to avoid any damage to the quality surface. This paper presents the development of new models and optimizing these models of machining parameters to minimize the cutting temperature in end milling process by integrating the genetic algorithm (GA) with the statistical approach. The mathematical models for the cutting temperature and surface roughness parameters have been developed, in terms of cutting speed, feed rate, and axial depth of cut by using Response Methodology Method (RSM). Two objectives have been considered, minimum cutting temperature and minimum arithmetic mean roughness (Ra). Due to complexity of this machining optimization problem, a multi objective genetic algorithm (MOGA) has been applied to resolve the problem, and the results have been analyzed.