ISSN: 2544-0780 Vol. 1 | No. 1 | 2017 | pp. 1-8 DOI: XXXXXXXXXXXXXXXXX

# EFFECT OF MACRO-GEOMETRY OF THE GRINDING WHEEL ACTIVE SURFACE ON TRAVERSE INTERNAL CYLINDRICAL GRINDING PROCESS

#### Krzysztof KAPŁONEK2, UNGUREANU3 Krzysztof KAPŁONEK2, UNGUREANU3 Wojciech Nicolae

1* Faculty of Mechanical Engineering, Department of Production Engineering, Koszalin University of Technology, Raclawicka 15-17, 75-620, Koszalin, Poland, e-mail: krzysztof.nadolny@tu.koszalin.pl 2 Faculty of Mechanical Engineering, Department of Production Engineering, Koszalin University of Technology, Poland 3 Department of Engineering and Technological Management, Technical University of Cluj Napoca, North University Center of Baia Mare, Romania (Received 3 March 2017, Accepted 26 May 2017) Abstract: This article presents results of experimental tests of internal cylindrical traverse grinding in which the total machining allowance is removed in a single pass. Grinding wheels with zone-diversified structure made on basis of abrasive grains from AlO were used in the 2 3 process. Such tools are characterized by different construction of rough and finish grinding zones. Moreover, conic chamfer is shaped on their active surface that allows for even distribution of machining allowance on the grinding wheel surface. What is described in the hereby work is a device for precise shaping of conic chamfer on the grinding wheel active surface (GWAS). The work also presents results of tests whose aim was to determine the influence of grinding wheel macrogeometry on the process of internal cylindrical traverse grinding of internal cylindrical surfaces made from steel 100Cr6. Changes of selected parameters of the machined surface geometric structure (Ra, Rz, RSm, Rdq and RTp) and values of the grinding power P were analyzed. It was proved that the greater the conic chamfer width, the better the results. Keywords: grinding wheel active surface (GWAS), conic chamfer, internal cylindrical grinding, traverse grinding

which the total machining allowance is removed in a single pass of the grinding wheel [1-9]. What seems exceptionally beneficial in this context is grinding with grinding wheels with conic chamfer shaped in their attacking part. It makes it possible to separate the function of rough and finish grinding into two zones. Thanks to the proper shaping of the conic chamfer in relation to the thickness of the machining allowance, a wide zone of rough grinding is obtained with a large number of active grains, which guarantees considerable increase of the grinding efficiency in relation to the reciprocal grinding process. So far expensive superhard grinding wheels from cubic boron nitride (CBN) were used in such processes, which required specialist grinders with significant rigidity and great grinding speed (v > 60 m/s) [6]. As the general costs of such s a process are relatively high, it is expected that new

### 1. INTRODUCTION

In modern production processes there is an incessant drive towards increasing the precision of dimensions, shape and quality of the machined workpiece surface and towards limiting the costs through an increase in the machining efficiency and shortening its time. The possibilities of increasing the efficiency of the operation through an increase in the values of machining parameters are, however, limited. This refers mainly to the process of internal cylindrical grinding, where increasing the machining parameter values is limited by the dynamic rigidity of the grinders and the grinding wheels’ resistance. Therefore, various modifications are sought, that would make it possible to overcome the above limitations. From among many innovative solutions, high hopes are placed in traverse grinding processes in