Papers by Keyword: Surface Waviness

Abstract: The surface of the finishing machined parts is defined mainly by roughness parameters. Growing demands on the part, especially mating sliding or rolling, require the specification of additional parameters, such as waviness parameters, particularly when there is significant resistance to seizing or noise reduction. This paper presents surface waviness characteristics of hardened burnished steel.

Abstract: In this paper, surface waviness quality in abrasive waterjet offset-mode turning has been studied regarding variations of some process parameters. Influence of five main operational parameters such as water pressure, cutting head traverse speed, abrasive mass flow rate, workpiece rotational speed and depth of cut on surface waviness of turned parts have been investigated using statistical approach. Second order regression model presented for surface waviness. The model accuracy was verified by comparing with experimental data. It found that abrasive mass flow rate, cutting head traverse speed and DOC are the most influential parameters while water pressure and workpiece rotational speed show lesser effectiveness.

Abstract: In this paper, an experiment has been made to take vibration and surface waviness of two kinds of engineering ceramics ( zirconia ceramics and alumina ceramics) as research targets. The experimental research results show that two kinds of surface waviness are on the workpiece, one is sparse and the other one is dense. It is known that the sparse one is caused by the forced vibration. In order to find out the generation mechanism of the dense one, a further exploration has been made. It shows that the dense surface waviness is caused by the self-excited vibration. Finally, some methods are put forward to reduce the surface waviness.

Abstract: Partial lubrication in cold rolling process has been investigated. The average flow Reynolds equation for rolling lubrication is set. This equation considers the pressure-viscosity effect and the average flow effect. Lubricating factors such as inlet velocity, surface waviness, lubricant viscosity are studied in analyses. The results for lubrication equation show that inlet velocity and lubricant viscosity have some influence on the value of rolling friction. And the results also show that surface waviness has great influence on both rolling pressure and rolling friction.

Abstract: For precision grinding, especially the aspheric grinding, the vibrations of wheel and workpiece have great impact on workpiece accuracy and roughness with special waviness. This paper firstly studies the relationship between grinding parameters and surface quality. Then according to the two kinds of aspheric machining mode: grinding with equal step feeding and grinding with equal angle feeding, the corresponding surface equations and vibration equations after grinding are given in this paper. Moreover, the specific analysis of aspheric surface model and surface waviness are also discussed for parameters optimization. The grinding experiments are done to support the theoretical research. The comparison between theoretical waviness analysis and experimental results shows good matching.