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Surface roughness prediction through internal kernel information and external accelerometers using artificial neural networks

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Abstract

In this paper, the average surface roughness parameter (Ra) is predicted using artificial neural network (ANN) models and internal kernel information and external piezoelectric accelerometer data. Experiments were conducted to obtain data to develop ANN models to predict surface roughness. A total of 72 samples were used to develop two networks, one based on accelerometer inputs and the other on kernel inputs. The Matlab ANN Toolbox was used for the modeling. The two networks had similar characteristics. Feed-forward backpropagation, ‘newff’, was the network structure selected, with a Levenberg-Marquardt backpropagation training function, ‘trainlm’, and a backpropagation weight and bias learning function, ‘learngdm’. Samples obtained at the experimental stage were randomly divided into three groups to train (70% of the samples), validate (15% of the samples) and test (15% of the samples) the neural networks with a ‘dividerand’ data division function. The input processing functions used were ‘fixunknowns’, ‘removeconstantrows’ and ‘mapminmax’. The transfer function was ‘tansig’ for hidden layers and ‘purelin’ for the output layer. The output processing functions used were ‘removeconstantrows’ and ‘mapminmax’. The inputs consisted of the process parameters of radial depth of cut (Ae), the axial depth of cut (Ap), the spindle speed (N), the feed rate (f), the feed per tooth (fz), the cutting speed (Vc), the tooth passing frequency (ft), the cutting section (Cs), the material removal rate (MRR) and the cutting tool characteristics of the cutter radius (R), the number of teeth (Z) and the tool shape. The main difference between the two neural networks consisted of data origin: one considered data obtained with accelerometers and the other data collected in the NC kernel. Results showing high correlation factors between outputs and targets confirm that data provided by both internal and external sources can be useful for Ra prediction. However, NC kernel data provide several advantages.

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Correspondence to Joaquim Ciurana.

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This paper was recommended for publication in revised form by Associate Editor Yong-Tae Kim

Guillem Quintana, Ph.D, is a project manager at Ascamm Technology Centre. He is also, a member of the Research group on Product, Process and Production (GREP) and associate professor in the Department of Mechanical Engineering and Industrial Construction in the University of Girona, UdG. He is Industrial Engineer (UdG) and Business Sciences graduate (UdG). His research is focused on manufacturing technologies, specially machining processes, with principal interest on instabilities and surface roughness evaluation.

Thomas Rudolf studied Mechatronics at the technical University of Darmstadt and received the degree of mechanical engineer in 2005. From 2005 to 2010 he worked as a research assistant at the Laboratory of Machine Tools, RWTH Aachen. His main research focus is the investigation monitoring strategies based on control internal data and drive signals.

Joaquim Ciurana is full Professor at the Department of Mechanical Engineering and Industrial Construction at the University of Girona. He is Head of the Product, Process and Production Engineering Group (GREP) at University of Girona. His research topic is Manufacturing Sciences. His current research focuses on developing models to characterize manufacturing processes. He mainly studies and analyses machining processes and additive manufacturing processes to make better plans for machining operations and better decisions based on process parameters selection and knowledge.

Christian Brecher is full Professor at RWTH Aachen, WZL. He carried out his degree at study of mechanical engineering (production engineering) at Aachen University and holds his Ph.D at the Laboratory for Machine Tools and Production Engineering (WZL) at Aachen University, chair of machine tools, department of machine technology. His current research focuses on developing machine tools and cutting processes. He mainly studies and analyses machine tools and monitoring systems applied to machine tools.

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Quintana, G., Rudolf, T., Ciurana, J. et al. Surface roughness prediction through internal kernel information and external accelerometers using artificial neural networks. J Mech Sci Technol 25, 2877–2886 (2011). https://doi.org/10.1007/s12206-011-0806-0

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  • DOI: https://doi.org/10.1007/s12206-011-0806-0

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