INFLUENCE OF THE MAGNETIC FIELD ON THE MORPHOLOGY OF THE WEAR OF THE INSERT IN P25 CARBIDE WITHOUT LUBRICATION D. NECIB & A. BOUCHOUCHA Laboratory of Mechanics, Faculty of Sciences of Engineering, Mentouri Constantine University, Constantine, Algeria ABSTRACT This paper reports the study of the influence of a magnetic field on the morphology of the wear of the cutting tool as a function of the cutting speed during the cutting operation, and observed the weight losses (wear) and their morphologies. The wear of the cutting tool was quantified by weight loss during cutting. While carrying out experiments, we have noticed the existence of a critical value of the magnetic field intensity H = 16.5 kA.m -1 , for which the depth of the crater wear of cutting is minimal and the cutting edge of the cutting tool is preserved. The presence of the magnetic field in the manufacturing contact modifies completely the morphology of cutting, shape of chips of manufacturing, and quality of the surface state of the cutting edge. Moreover, the increasing of the magnetic field was found to change the cutting temperature. In the present manuscript we presented the different behaviours of manufacturing observed with and without magnetic field. KEYWORDS: Cutting Tool, Cutting Speed, Magnetic Field, Surface Quality, Wear INTRODUCTION Manufacturing by chip removal, designates the set of techniques that enable to obtain a surface via removing material using a cutting tool. This old technique is often described as a costly cutting technique due to the fact that the shaping of the material piece leads to the transformation of the noble material into waste (chips). However; it is still an important and widespread manufacture technique. In shaping the metals by cutting, the turning process, the subject of our study, represents on its own for 33 % of the field of manufacturing by chips removal. Turning plays an important role in the engineering industry, where manufacturers seek to increase production with minimum possible cost. These two objectives are limited by several parameters including the cutting tool lifetime. This has prompted researchers to improve, firstly, the quality of the material of the cutting tool, and secondly, to minimize the negative effect of the cutting speed [1]. For this, we sought to optimize the cutting tools life by a fairly new industry, which involves applying to the contact piece- tool, a magnetic field during manufacturing. Reduction of wear of a cutting tool can be obtained either by choosing the geometry and hardness of the active part of the tool, or via using a machined material that has been polished by a thermal treatment. The latter must satisfy two constraints: on one hand, a quantitative constraint which leads to the reduction of the manufactured parts cost. On the other hand, a qualitative constraint which consists in obtaining surfaces possessing optimal geometries and micro-geometries. In 1987, V. J. Al Shits [2] studied the effect of a magnetic field applied to metal pairs and showed that its application results in a considerable modification of the plasticity of metals; that is the magnetoplastic effect. Moreover, he showed that the magnetic field can lead to the hardening of metal crystals; therefore a magnetoplastic positive effect. Nevertheless, it can lead to the softening of crystals; which is the magnetoplastic negative effect. In addition, the nature of the magnetoplastic effect depends mainly on the magnetic properties of metals [2]. International Journal of Mechanical Engineering (IJME) ISSN 2319-2240 Vol. 2, Issue 4, Sep 2013, 65-74 © IASET