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In this paper, an experimental investigation on the tool wear characteristics in ductile cutting of tungsten carbide using commercially available cubic boron nitride (CBN) inserts is presented. The experiments were carried out on a high-speed milling machine tool (Makino V55). The cutting forces were measured using a three-component dynamometer. The tool wear was examined using an optical measurement...
Different types of M50 steel (63 HRc) have been hard turned using cubic boron nitride (CBN) tools to experimentally investigate microstructual effects on both continuous and intermittent cutting. In continuous cutting, powder metallurgy (PM) M50 results in substantially lower tool wear and wear rate than conventional M50, presumably due to refined carbides that may delay delamination wear. In intermittent...
This work shows two alternative methods to characterise diamond tool wear. The macro-geometric method involves readily measurable variables and, therefore, it requires little time. However, it allows only a partial understanding of the phenomena involved in tool wear. The micro-geometric method implies a deeper understanding of mechanical and tribological mechanisms involved in tool wear and, therefore,...
Single-crystal silicon is not only a dominant substrate material for the fabrication of micro-electro and micro-mechanical components but also an important infrared optical material. Since silicon is a nominally brittle material, currently it is finished by grinding, lapping and chemo-mechanical polishing (CMP). However, silicon can be deformed plastically in machining, yielding ductile chips under...
The machining characteristics and material removal mechanisms of two dental ceramics-feldspathic porcelain and yttria-stabilized tetragonal zirconia-were investigated using a dental handpiece and diamond burs with different grit sizes. The material removal rates were measured as a function of total machining time using a constant load of 2N on the bur, consistent with clinical cutting conditions....
In machining, coolants and lubricants improve machinability, increase productivity by reducing the tool wear and extend the tool life. However, the use of cutting fluids in metal working operations may seriously degrade the quality of the environment. Consequently, many governments recommend the manufacturers to reduce the volume and the toxicity of their cutting fluids. Up to now, dry machining has...
Tool wear is a significant factor affecting the machined surface quality. In this paper, a molecular dynamics (MD) simulation approach is proposed to model the wear of the diamond tool in nanometric cutting. It includes the effects of the cutting heat on the workpiece property. MD simulation is carried out to simulate the nanometric cutting of a single crystal silicon plate with the diamond tip of...
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