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Research on forced cooling of machine tools and its operational effects

Jedrzejewski Jerzy, Winiarski Zdzislaw, Kwasny Wojciech

Journal of Machine Engineering

2020

Vol. 20, No. 2

18--38

The aim of this paper was to analyse in depth the existing research on the effectiveness of forced cooling and the directions in its improvement and development against the background of the increasing needs of machine tools and machining processes. The forced cooling methods used and their importance from the point of view of the development of machine tools are discussed. A detailed review of the state of the art in this field, including the latest research reports, is carried out. The essence and methods of forced cooling parameters improvement through holistic modelling, numerical simulations and optimization are presented. Moreover, the currently achievable effectiveness of forced cooling is illustrated with the results of the research conducted by the authors. Finally, conclusions are drawn and suggestions concerning the future research in this field are put forward.

Ball screw unit precise modelling with dynamics of loads and moving heat sources taken into account

Jedrzejewski Jerzy, Kowal Zbigniew, Kwasny Wojciech, Winiarski Zdzislaw

Journal of Machine Engineering

2019

Vol. 19, No. 4

27--41

This paper deals with the precision modelling of the ball screw unit’s thermal behaviour in the turning centre and its impact on the tool head positioning error. The error components along controllable axes X and Z are described in detail using an FE model integrating the changes in thermal and force loads and deformations occurring during the motion of the nut as a heat source. The impact of the nut work cycle on the thermal deformations of the ball screw and the displacements of the slideways and the screw points along both the axes and on carriage positioning precision is demonstrated.