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M. M. Rahman

Bio: M. M. Rahman is an academic researcher from National University of Singapore. The author has contributed to research in topics: Machining & Tool wear. The author has an hindex of 35, co-authored 120 publications receiving 3957 citations.


Papers
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TL;DR: In this paper, the effect of cutting conditions on the machinability of Inconel 718 was discussed and two types of coated cemented carbide inserts, grades EH20Z-UP and AC25, were tested at a constant depth of cut.

317 citations

Journal ArticleDOI
TL;DR: In this paper, the UVC mechanism is influenced by three important parameters: tool vibration frequency, tool vibration amplitude and workpiece cutting speed that determine the cutting force, which in turn reduces both cutting force and tool wear, improves surface quality and prolongs tool life.
Abstract: The ultrasonic vibration cutting (UVC) method is an efficient cutting technique for difficult-to-machine materials. It is found that the UVC mechanism is influenced by three important parameters: tool vibration frequency, tool vibration amplitude and workpiece cutting speed that determine the cutting force. However, the relation between the cutting force and these three parameters in the UVC is not clearly established. This paper presents firstly the mechanism how these parameters effect the UVC. With theoretical studies, it is established that the tool–workpiece contact ratio (TWCR) plays a key role in the UVC process where the increase in both the tool vibration parameters and the decrease in the cutting speed reduce the TWCR, which in turn reduces both cutting force and tool wear, improves surface quality and prolongs tool life. This paper also experimentally investigates the effect of cutting parameters on cutting performances in the cutting of Inconel 718 by applying both the UVC and the conventional turning (CT) methods. It is observed that the UVC method promises better surface finish and improves tool life in hard cutting at low cutting speed as compared to the CT method. The experiments also show that the TWCR, when investigating the effect of cutting speed, has a significant effect on both the cutting force and the tool wear in the UVC method, which substantiates the theoretical findings.

276 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of cutting speed, feed rate, depth of cut and tool cutting edge geometry on cutting forces, surface roughness and surface damage in high-speed turning of Inconel 718 using PCBN tools has been discussed.

213 citations

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TL;DR: In this article, the influence of major operating parameters on the performance of micro-EDM of tungsten carbide was investigated with focus in obtaining quality micro-holes in both transistor and RC-type generators.

208 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of the electrodes for the finishing micro-EDM was evaluated based on the achieved surface roughness and surface characteristics with respect to material removal rate (MRR) and electrode wear ratio (EWR).

192 citations


Cited by
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08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Journal ArticleDOI

7,335 citations

Journal ArticleDOI
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.

4,192 citations

Journal ArticleDOI
TL;DR: In this paper, the Taguchi method was used to find the optimal cutting parameters for turning operations, and the main cutting parameters that affect the cutting performance in turning operations were found.

1,186 citations