Modelling of the Temperature in the Chip-Forming Zone Using Artificial Intelligence Techniques

Neural Network World; International Journal on Neural and Mass - Parallel Computing and Information Systems › Vol. 20 Nbr. 2, March 2010

Author: Tanikic, Dejan

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Summary

Heat generation in the cutting zone occurs as a result of the work done in metal cutting. In this study, in order to measure the temperature generated in the chip-forming zone, numerous experiments were carried out for different cutting regimes. During these experiments, the chip's top temperature was measured using an infrared camera. Collected data were analyzed, and temperature dependence on various cutting regimes was formulated. After that, measured data were modelled using the various techniques: response surface methodology, various types of artificial neural networks and neuro-fuzzy system. The accuracy of the proposed models is presented as well as their suitability for the considered problem. Finally, the system for the adaptive control of the cutting temperature, based on the proposed models, is presented.

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Modelling of the Temperature in the Chip-Forming Zone Using Artificial Intelligence Techniques

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1. Introduction

Optimization methods in metal cutting processes, considered to be a vital tool for continual improvement of output quality of products and processes, include modelling of input-output and in-process parameters relationships and determination of optimal cutting conditions [I]. The work done in the metal cutting process is consumed on plastic deformation of the cutting layer, as well as on overcoming friction that occurs on the contact area of the cutting tool (i.e. cutting insert) and workpiece [2]. The heat generated in the chip- forming zone directly influences the quality and accuracy of the machined surface and other occurrences in the metal cutting process, such as: Built Up Edge (BUE) formation, work-hardening, plastic deformation of the cutting edge, deformation of the workpiece, etc [3].

Turning is the most frequently used metal cutting process. Theoretically, three zones of heat generation can be identified during turning (Fig. 1):

* cutting zone (primary and secondary heating zone),

* tool-chip contact zone,

* tool- workpiece contact zone.

The largest quantity of the heat flows within the chip (almost 90%) while a very small portion is conducted through the workpiece and ...

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