Resistance to cast iron seizure determined by the technological condition of the surface layer

Abstract

Purpose -The aim of this study was to evaluate a surface layer of the condition resistance to seizure. The surface layer was shaped in the processing grinding and burnishing. Design/methodology/approach -The resistance to seizure tests were carried out on a test station specially designed by the author. It is possible to simultaneously test the same two pairs of pivot-pan kinematic pairs on this station. Moreover, the time, route and the temperature of the friction area were registered. The time of sliding group operation from the moment when a lubricant is no longer added to the friction pair to the moment the sliding group reaches the critical temperature T ϭ 418 K (145°C) is taken as a seizure indicator. Findings -The structure and state of the surface layer have an influence on the seizure of the surface of cooperating elements. Greater resistance to the seizure of the burnished surface in comparison to the ground surface is associated with differences in the state of the surface layer. The burnished surface has a smaller surface roughness and a higher value of the bearing surface curve, and the compressive stress occurs more often in the surface layer. Originality/value -There have been no studies on the effects of burnishing machining and grinding of cast iron in resistance to seizure.