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Balkrishna C. Rao

Bio: Balkrishna C. Rao is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Machining & Severe plastic deformation. The author has an hindex of 15, co-authored 47 publications receiving 1122 citations. Previous affiliations of Balkrishna C. Rao include Louisiana Tech University & Purdue University.


Papers
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TL;DR: In this paper, the authors have formalized the frugal-innovation process based on examples covered in this effort and also examined their disruptiveness vis-a-vis other innovations.

210 citations

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TL;DR: In this paper, the analytical and experimental study on the high-speed face milling of 7075-T6 aluminum alloys with a single insert fly-cutter was conducted.
Abstract: This research is concerned with the analytical and experimental study on the high-speed face milling of 7075-T6 aluminum alloys with a single insert fly-cutter. The results are analyzed in terms of cutting forces, chip morphology, and surface integrity of the workpiece machined with carbide and diamond inserts. It is shown that a high cutting speed leads to a high chip flow angle, very low thrust forces and a high shear angle, while producing a thinner chip. Chip morphology studies indicate that shear localization can occur at higher feeds even for 7075-T6, which is known to produce continuous chips. The resultant compressive residual stresses are shown for the variation of cutting parameters and cutting tool material. The analysis of the high-speed cutting process mechanics is presented, based on the calculation results using extended oblique machining theory and finite element simulation.

141 citations

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TL;DR: In this article, the experimental and numerical study of face milling of Ti-6Al-4V titanium alloy was performed by uncoated carbide cutters in the presence of an abundant supply of coolant.

118 citations

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TL;DR: In this paper, the authors presented a model of the dynamic cutting force process for the three-dimensional or oblique turning operation, which is linked to a tool-workpiece vibration model.
Abstract: This paper presents a model of the dynamic cutting force process for the three-dimensional or oblique turning operation. To obtain dynamic force predictions, the mechanistic force model is linked to a tool–workpiece vibration model. Particular attention was paid to the inclusion of the cross-coupling between radial and axial vibrations in the force model. The inclusion of this cross-coupling facilitates prediction of the unstable–stable chatter phenomenon which usually occurs in certain cases of finish turning due to process non-linearity. The dynamic force model developed was incorporated into a computer program to obtain time-saving chatter predictions. Experimental tests were performed on AISI 4140 steel workpieces to justify the chatter predictions of the dynamic cutting process model in both the finishing and roughing regimes. Experimental results corroborate the unstable–stable chatter predictions of the model for different cases of finish machining. In addition, experimental results also confirmed the accuracy of chatter predictions for various cases of rough turning.

116 citations

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TL;DR: In this article, the deformation fields associated with chip formation in plane strain machining are described and the ability to impose very large strain deformation in a controlled manner is highlighted.
Abstract: Characteristics of the deformation fields associated with chip formation in plane strain machining are described. The ability to impose very large strain deformation in a controlled manner is highlighted. The creation of nano- and ultra-fine grained structures by machining is demonstrated in a variety of metals and alloys. These results indicate that machining not only offers a simple method for large scale manufacturing of nanostructured materials, but also provides a unique experimental configuration for studying large strain deformation phenomena.

112 citations


Cited by
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Journal ArticleDOI
TL;DR: A review of the state of research on the chatter problem and classifications the existing methods developed to ensure stable cutting into those that use the lobbing effect, out-of-process or in-process, and those that, passively or actively, modify the system behavior as mentioned in this paper.
Abstract: Chatter is a self-excited vibration that can occur during machining operations and become a common limitation to productivity and part quality. For this reason, it has been a topic of industrial and academic interest in the manufacturing sector for many years. A great deal of research has been carried out since the late 1950s to solve the chatter problem. Researchers have studied how to detect, identify, avoid, prevent, reduce, control, or suppress chatter. This paper reviews the state of research on the chatter problem and classifies the existing methods developed to ensure stable cutting into those that use the lobbing effect, out-of-process or in-process, and those that, passively or actively, modify the system behaviour.

790 citations

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TL;DR: A three-year study by the CIRP's Collaborative Working Group on Surface Integrity and Functional Performance of Components as discussed by the authors reported recent progress in experimental and theoretical investigations on surface integrity in material removal processes.

769 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the fundamental modeling of chatter vibrations in metal cutting and grinding processes is presented, along with a series of research topics, which have yet to be studied for effective use of chatter prediction and suppression techniques in industry.

692 citations

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TL;DR: In this paper, a redistribuição governamental através do sistema de benefícios fiscais afecta estas tendências.
Abstract: Será que a desigualdade de rendimentos aumentou durante os últimos tempos? Quem ganhou e quem perdeu neste processo? Este processo afectou todos os países da OCDE uniformemente? Em que medida é que maiores desigualdades de rendimentos são a consequência de maiores diferenças nos rendimentos dos trabalhadores e até que ponto são afectados por outros factores? Finalmente, como é que a redistribuição governamental através do sistema de benefícios fiscais afecta estas tendências?

635 citations