Abstract
In order to study the fractal features of the tool profile of worn surface and cutting force during the process of cutting hard brittle materials such as ceramics, the milling experiments of ZrO2 were carried out. The images of worn surface and cutting force were collected and preprocessed with digital image processing technology and phase space reconstruction method. Then the fractal dimensions were calculated and the change regularity was analyzed. The research findings show that the fractal dimension of worn surface is affected by wear rates and machining time, and can be different while the wear loss is same. The fractal dimension of cutting force oscillates with a high-low-high general trend.
Highlights
Zirconia ceramic is a widely-used typical ceramic material with such characteristics as heat resistance, wear resistance, corrosion resistance etc
Compared with the metallic material, the completely sintered zirconia ceramic has a high hardness allowing for quick wear during cutting influencing the appearance quality and dimensional accuracy of the workpieces
Using fractal dimension to directly characterize the irregularity of the tool wear profile requires optical instruments for imaging
Summary
Zirconia ceramic is a widely-used typical ceramic material with such characteristics as heat resistance, wear resistance, corrosion resistance etc. A great deal of research has indicated that tool wear is characterized by irregularity, nonlinearity, and randomness. The indicators such as common average wear width VB, maximum wear width VBmax etc. There is no research on fractal during the process of cutting of hard and brittle materials. Using fractal dimension to directly characterize the irregularity of the tool wear profile requires optical instruments for imaging. The paper applies the fractal theory to research on tool wear in milling of zirconia ceramic, analyzes the fractal characteristics of the tool wear profile and cutting force, and expects to provide a foundation for optimized cutting parameters of the hard and brittle materials and on-line monitoring of tool wear
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