关键词: 微犁削, 沟槽, 微观形貌, 分形, 粗糙度

Abstract:

In this paper,the microtopography of metal surfaces machined via the micro-ploughing is analyzed by combining the evaluation methods of roughness and fractal dimension. Then,the topographical features of micro groove surfaces and the effects of machining parameters on these features are investigated. The results show that the distributions of fractal dimension and roughness of contour profiles in different positions on the micro-ploughing groove surfaces are subject to some specific statistical laws,that there is a relatively strong positive correlation between the average fractal dimension and the average roughness,and that,in a certain range of manufacturing parameters,an increasing groove depth and a decreasing machining feed may cause an increase in average fractal dimension and roughness. In addition,based on the experimental investigation,some digital models are constructed with an improved W-M fractal function to describe the micro-ploughing groove surfaces with specific topographical features,which are beneficial to the initiative design and simulation of functional surface structures fabricated via micro-ploughing.

Key words: micro-ploughing, groove, microtopography, fractal, roughness