Cutting dynamics and surface quality

2011

Journal of Sound and Vibration, 2002

2018

The problem of surface quality and cutting stability in the machining processes is very important and is strictly connected with the final quality of the product. Therefore, this paper describes a new theoretical model for the dynamic cutting forces of orthogonal cutting in turning. A specific advantage for the presented model is the convenience for vibration prediction. The presented dynamic force model is used to predict variable cutting forces with dynamic cutting between cutting tool and workpiece. This model is considered two degree of freedom complex dynamic model of turning with orthogonal cutting system. The complex dynamic system consists of dynamic cutting system force model which is based on the shear angle (φ) oscillations and the penetration forces which are caused by the tool flank contact with the wavy surface.

Materials Science Forum, 2016

Machine tool vibrations cause uncomfortable noise, may damage the edges of cutting tools or certain parts of machine tools, but most importantly, they always have negative effect on the quality of the machined surface of workpieces. These vibrations are especially intricate in case of milling processes where complex tool geometries are used, like helical, serrated, non-uniform pitch angles, and so on. During the milling process, the arising vibrations include free, forced, self-excited, and even parametrically forced vibrations together with their different combinations. Regarding surface quality, the most harmful is the self-excited one called chatter, which is related to the regenerative effect of the cutting process. Its relation to machined surface quality is demonstrated in an industrial case study. The modelling and the corresponding cutting stability are presented in case of a helical tool applied for milling with large axial immersions. The extremely rich spectrum of the mea...

Journal of Optimization, 2015

Tool vibration and surface roughness are two important parameters which affect the quality of the component and tool life which indirectly affect the component cost. In this paper, the effect of cutting parameters on tool vibration, and surface roughness has been investigated during end milling of EN-31 tool steel. Response surface methodology (RSM) has been used to develop mathematical model for predicting surface finish, tool vibration and tool wear with different combinations of cutting parameters. The experimental results show that feed rate is the most dominating parameter affecting surface finish, whereas cutting speed is the major factor effecting tool vibration. The results of mathematical model are in agreement with experimental investigations done to validate the mathematical model.

The International Journal of Advanced Manufacturing Technology, 2013

2017

Peter Osborne (ed.), Futurethoughts: Critical Histories of Philosophy, 2024

This essay advances a reading of Theodor W. Adorno's mature interventions into sociology as a 'critique of sociological categories'. It maintains that his unorthodox commitment to sociology was simultaneously a dialectical commitment to the critical value of its fundamental untenability – at least, in its dominant bourgeois variant. From this sketch, the essay attempts to examine one instance of this critique, centred on the category of reification and one of its most proximate sociological cognates, Émile Durkheim’s concept of the social fact. The first section reconstructs Adorno’s concept of reification as outlined in Negative Dialectics and elsewhere. With recourse to Marx’s extended mature project and pace the interpretation offered by Gillian Rose, it argues that reification in Adorno underscores not the discrepancy between use-value and exchange-value as well as the exchange of false equivalents but holds to issues pertaining to the social and relational form of value that objectively arise from the exchange process. The second section then recounts Durkheim’s concept and theory of the social fact as advanced in his early plea for the sociological discipline, The Rules of Sociological Method. Drawing on Adorno’s essays, interventions, lectures, and, albeit cautiously, seminar protocols, the concept of reification is taken as a leitmotif with which to reconstruct his mature encounter with Durkheim. Doing so demonstrates that Adorno finds in the concept of the social fact a correct but deficient notion of reification, a recognition, to paraphrase Marx, that social relations between individuals assume the phantasmagoric form of relations between things, though with the intonation inversed. The final section shows how this framework is redeployed as part of Adorno’s confrontation with Karl Popper and others as part of the now-infamous Positivism Dispute. It argues that some of the stakes involved in this dispute might be better understood if Adorno’s criticisms are viewed as offering a particular reading of internal developments within sociological positivism itself. For, whilst Adorno characterises both Durkheim and Popper as positivists, much to the chagrin of their defenders, the charges levelled against them are not equivalent. Comparing the critiques levelled against them brings to the forefront how sociological positivism over the course of the twentieth century was to undergo a theoretical impoverishment. In this, Durkheim is mobilised because his sociological theory sketched a ‘more serious’ alternative approach to those sociologists who lacked even the faintest hint of, to use Adorno’s phraseology, the ‘guilt of reification’.

August - October 2024 | Volume 1 | Issue 1, 2024