Modelling of workpiece surface layer state after grinding process.pdf

ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING Vol. II 2002 No. 2 Modelling of workpiece surface layer * state after grinding process M. URBANIAK Department of Production Engineering, Technical University of Łódź, Stefanowskiego 1–15, 90-537 Łódź In the paper, a neural model allowing us to forecast chosen surface layer features of the ground workpiece is described. The model was used for analysing the influence of wheel characteristics and dressing conditions on surface roughness of workpiece and residual stresses. The relationships published in literature were also taken into account. An example of the model application was shown as well. Keywords: surface roughness, residual stresses, modelling 1. Introduction The problem of the influence of grinding wheel cutting surface state on grinding process result is one of main topics of research works carried out in the field of abra- sive machining. As the problem is complex, its description by modelling seems to be a good solution. There are two areas the problem: evaluation of workpiece surface layer state and surface roughness [1]. The first one describes the influence of heat and plastic deformation during grinding. In Tönshoff’s publication [1], review of 13 mod- elling solutions describing the influence of mechanical and heat factors on the material being ground were shown. As a result, he observed such changes of microstructure as change of hardness, phase changes and structural changes, which cause also changes of volume. As a result of model action, the forecast of stress level in workpiece sur- face layer was made. Residual stress may lead to workpiece material damage and de- formations. Most of heat models are based on the the Carslaw–Jae