Roshaliza Hamidon
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Preferred name
Roshaliza Hamidon
Official Name
Roshaliza, Hamidon
Alternative Name
Hamidon, Roshaliza
Hamidon, R.
Main Affiliation
Scopus Author ID
54941292900
Researcher ID
ICQ-9949-2023

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Effect of Inclined Angle in Trimming of Ultra-high Strength Steel Sheets Having Inclined and Curved Shapes

2023-11-01 , Leong K.Y. , Muhammad Hasnulhadi Mohammad Jaafar , Nur Liyana Tajul Lile , Zailani Zainal Abidin , Mohd Zamzuri Mohammad Zain , Roshaliza Hamidon

Trimming the scrap portion of ultra-high strength steel (UHSS) components poses a significant challenge due to the inherent high strength and hardness characteristics of the material. For UHSS components with a higher geometric complexity such consisting of inclined and curved sections, sharp tilt, and small bend radius, the large trimming load results in poor sheared quality and shape defects, which commonly happen in these areas. This research investigated the effects of applying a small inclination angle to the punch in the trimming of the UHSS parts having an inclined and curved shape. The inclined punch was modified to four sets of different degrees of inclination i.e., 1°, 3°, 5°, and 10°. A comparative analysis of the trimming load, trimming energy, sheared edge quality and shape defects was conducted between these modified punches and the normal punch for their effectiveness in the trimming operation. Results showed that the application of inclination angle significantly decreased the trimming load, reduced the trimming energy, and improved the sheared edge surface quality, as well as prevented the shape defects at the inclined and curved zones as compared to the outcomes produced when trimming using the normal punch. The study suggested that the change to the punch geometry is an effective option to improve the performance of the process as well as the quality of the part, particularly in trimming the high-strength components having complex shapes.

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Implementation of PID Controller for Solar Tracking System

2021-01-01 , Zakaria S. , Ong J.Q. , Engku Ariff E.A.R. , Roshaliza Hamidon , Zailani Zainal Abidin , Muhammad Syahril Bahari , Azmi Harun

Proportional integral derivative (PID) controllers are widely used in industrial processes cue to their simplicity and effectiveness for linear and nonlinear systems. Solar tracking system is one of the most direct approaches adopted to harvest more solar energy from photovoltaic (PV) system compared to stationary solar system. Hence, the PV panels able to receive maximum sunlight and generate more energy. Arduino based prototype dual axis (Azimuth-Altitude) solar tracking system is constructed with the implementation of PID controller. The performance of dual axis tracking system and stationary solar system are compared and discussed. Types of tuning methods for PID constant will be determine with use of Arduino IDE. Comparative results depicted that performance in terms of current, voltage and power value. According to results, dual axis solar tracking system with implement of PID controller is shown better performance compare to stationary solar system.

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Electrical discharge coating of NiTi alloy in deionized water

2021-01-01 , Jamaluddin R. , Tan Chye Lih , Roshaliza Hamidon , Ahmad Fairuz Mansor , Azwan Iskandar Azmi

Shape memory alloys, specifically nickel-titanium (NiTi), exhibit excellent technical properties that suited them for biomedical applications. However, the release of nickel ions into human body is a drawback because it results in severe adverse health effects as well as degrades the biocompatibility of the alloys. In this work, surface modification through adaptation of electrical discharge machining was used to develop a deposition layer of titanium oxide on NiTi alloy surface. The adaptation was through electrical discharge coatings (EDC) parameters such as polarity, gap voltage, and erosion depth that were set up to study their effects on the experimental performance. The experiment was parameterized by implementing 2 level of full factorial design with ANOVA analysis to measure the surface roughness of that machined surface. One-factor-at-a-time, OFAT method is applied for XRD analysis by adopting the previous parameters approach. The EDC process was aided with deionized water and pure titanium rod as the dielectric fluids and electrodes, respectively. It was determined that the high level of gap voltage provided some major constituents on the surface of NiTi alloy based on XRD analysis. As apparent, this substantiated the presence of the tool materials and their oxide layer phases. The interaction of polarity and gap voltage also indicated a significant effect towards the surface roughness.

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Machining of Cobalt Chromium Molybdenum (CoCrMo) Alloys: A Review

2021-01-01 , Saravanan R. , Roshaliza Hamidon , Murad N.M. , Zailani Zainal Abidin

Cobalt chromium molybdenum (CoCrMo) alloys are not only broadly applied in engineering fields but also in manufacturing of surgical implants components and medical devices due to its outstanding properties of wear resistance and great biocompatibility as demanding in the vivo environment. However, these alloys classified as difficult to cut materials as it presents several characteristics such as high hardness, low thermal conductivity, high wear resistance and strain hardening which contribute to its poor machinability. Although these CoCrMo alloys are theoretically similar to titanium alloy in terms of properties but the studies on machining of CoCrMo alloys still insufficient. This paper provides a review on machining aspects of cobalt chromium molybdenum (CoCrMo) alloys including the properties and machinability, cutting fluid methods and tool material selection for these alloys.

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Enhancement on the surface quality in machining of aluminum alloy using graphene nanoparticles

2024-03-07 , Zailani Zainal Abidin , Ariffin N.I. , Norshah Afizi Shuaib , Roshaliza Hamidon , Azmi Harun , Sultan A.A.M.

Aluminum alloys are popularly used in the aerospace industry due to their lightweight and high strength-to-weight ratio. However, cutting these alloys can result in various machinability issues such as tool wear, built-up edges, and material adherence on the cutting tool. To address these issues and minimize the use of lubricants, researchers are exploring alternative greener techniques. One such technique is the use of nano lubrication technology. In this research, the consequence of three cutting techniques - dry cutting, minimum quantity lubrication (MQL), and MQL dispersed with graphene nanoparticles - was experimentally studied to assess their impact on hole quality, surface roughness, and the number of holes drilled. The findings showed that the addition of graphene nanoparticles improved roughness quality, reduced tool wear, and increased the number of holes drilled, but had less impact on hole accuracy. This study highlights the importance of nanoparticles in enhancing the machinability of aluminum alloys and offers promising avenues for future research in this area.

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Effect of tool engagement on cutting force for different step over in milling aisi p20 tool steel

2021-01-01 , Roshaliza Hamidon , Mohamed N.I. , Saravanan R. , Azmi H. , Zailani Zainal Abidin , Mohd Fathullah Ghazli@Ghazali

In mold production, end milling with tool path strategies is required for the process known as pocket operation. Different step overs involve depending on the type of tool path strategy used. Thus, different engagement will occur and leads to fluctuation of cutting force due to different step over during the process. However, most of study before focused on the effect of cutting speed, feed rate and depth of cut only in machining AISI P20. Thus, in this study, step over will be considered as one of the factor to improve machining force. The objective of this study are to evaluate the effect of cutting parameters and step over on cutting force and to study the behavior of cutting force for different tool engagement. A series of milling operation was carried out by varying cutting speed and feed rate. However, the depth of cut was set to 0.25 mm for each run. Step over with 100%, 75% and 50% were selected in this study. L27 Taguchi and S/N ratio were used to determine the significant factors that influence the result. Within the range of cutting parameters selected, feed rate were found to be the most significant parameters that influence cutting force. The highest cutting force found for 100% step over compared to 75% and 50% step over. According to the result, cutting force increased as the step over increased. In can be concluded that, step over is one of the important cutting parameter that affected machining output.

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Study the Effect of Cutting Parameter in Machining Kenaf Fiber Reinforced Plastic Composite Materials Using DOE

2021-01-01 , Azmi Harun , Che Haron C.H. , Zailani Zainal Abidin , Roshaliza Hamidon , Muhammad Syahril Bahari , Zakaria S. , Hamid S.H.A.

Natural fiber is a hairy like raw material which comes from natural sources such as animal, plant, and mineral fibers. Kenaf fiber known with scientific name as Hibiscus Cannabinus is one natural fibers which becoming popular as a reinforced for plastic composites material in the industrial application such as automobile, aircraft, and marine engineering. However, milling these materials present a few problems, which are surface roughness and delamination factors are appear during the machining process, associated with the characteristics of the material and the cutting parameter. The objective of evaluating the cutting parameters (spindle speed, feed rate, and depth of cut), the influence of the fibers under surface roughness (Ra) and delamination factor (Fd). In this research study, Response Surface Methodology (RSM) was used to conduct the experiment. In addition, this method established considering milling with prefixed cutting parameters using HSS end mill. The experiment result was analyzed using Design Expert software. It was found that the optimum parameters for the minimum surface roughness and delamination were spindle speed at 2000 rpm, feed rate at 300 mm/min, and depth of cut at 2.0 mm. The spindle speed and feed rate are the main factors influence the effect of surface roughness and delamination in kenaf fiber reinforced plastic. High spindle speed and low feed rate resulted in minimum surface roughness and delamination.

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Progressive tool wear in machining of aluminum alloy: The influence of solid lubricant nanoparticles

2021-01-01 , Zailani Zainal Abidin , Jaaffar N.S. , Roshaliza Hamidon , Harun A. , Jaafar H.

The abstract should summarize the contents of the paper in short terms, i.e. 150–250 words. Aluminum alloy 7075 are used in a variety of applications particularly in automotive and aerospace industry owing to their features of lightweight, high-strength and corrosion resistant properties. However, build up edge (BUE) and material adhesion either on cutting tool or workpiece render these materials difficult to machine. Their machining is associated with rapid tool wear and poor workpiece quality. Cutting fluids are currently the common solution to these problems although there are concerns on their use in terms of health footprint and environmental effects. Thus, new innovations are crucial to enhance the machinability as well as diminishing hazards through encouraging greener machining techniques. In this research, the use of solid lubricants; graphene and hexagonal boron nitride nanoparticles to augment minimum quantity lubricant were researched in macro drilling. Effects of four different machining conditions namely dry, minimum quantity lubricant, minimum quantity lubricant dispersed with graphene and hexagonal boron nitride nanoparticles were investigated on their progressive tool wear behavior. A notable finding is that the nanoparticles of solid lubricants had a significant factor in improving machinability of aluminum alloy 7075 compared to dry and minimum quantity lubricant alone. It was observed that the use of minimum quantity lubricant dispersed with hexagonal boron nitride demonstrated desirable tool life enhancement, tool wear reduction and number of holes drilled increment.

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Improvement on the Surface Quality in Machining of Aluminum Alloy Involving Boron Nitride Nanoparticles

2021-01-01 , Zailani Zainal Abidin , Zaibi N.M. , Roshaliza Hamidon , Harun A. , Muhammad Syahril Bahari , Zakaria S.

Aluminum Alloys are used in a variety of applications due to their lightweight, strength-to-weight ratio and relatively ease of fabrication. In aerospace industry, millions of holes drilled annually on airframe structures. Normally, cutting fluids have been used to help reduce friction and heat. However, the use of cutting fluid is one of the major concerns when considering the environmental issues in machining. The disposal of used cutting fluid poses problems to the environment. This research investigates the effect of greener technique; hexagonal Boron Nitride nanoparticles dispersed in oil as compared to dry cutting and oil alone in through hole drilling operation Their impact on tool wear, surface roughness, and holes quality in terms of diameter accuracy, circularity and cylindricity were experimentally studied. Results showed that application of hexagonal Boron Nitride improved surface finish and produced better dimensional hole accuracy. The work clearly shows the important of nanoparticles in improving machinability of this material.

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Surface roughness analysis of NiTi alloy in electrical discharge coating process

2020-12-18 , Jamaluddin R. , Lih T.C. , Ahmad Fairuz Mansor , Azwan Iskandar Azmi , Roshaliza Hamidon

Nickel-Titanium (NiTi) alloys, most widely known as nitinol, are presently employed in many micro-engineering applications such as coronary stents of medical implants due to their unique properties (shape memory effect and superelasticity). However, non-optimized surface finishing attributed a significantly high potential of nickel exposure after a long time of application. Releasing of nickel ion to the body environment can be harmful and toxicity resulting in adverse health as well as degrading the material biocompatibility. It is widely known that controlled surface roughness play a vital role in the formation of new bone ingrowths around implant. In this study, surface modification of NiTi alloy was used through electrical discharge coating (EDC); an adaptation of electrical discharge machining. The potential of EDC in which can facilitates the production of hard coatings may exploit the phenomena for the attachment of desirable materials onto the surface of materials. Therefore, the aim of this paper is to present a robust method (two levels of full factorial design and ANOVA) to determine the desired parameters and significant factors based on the surface roughness of the machined surface. Manipulation of parameters set up such as gap voltage, discharge duration and pulse interval and the current were employed and a reverse polarity was selected for this experiment. The results demonstrated that the most significant factors influence the surface coating performances are the discharge duration, current, gap voltage as well as the interaction between gap voltage and discharge duration.

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