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Deep cryogenic treatment (DCT) has been acknowledged as an approach to modify metallic materials properties to enhance their performance. The effects of deep cryogenic treatment parameters (cryogenic temperature, cooling rate, soaking time and tempering temperature) on microstructure, mechanical properties and machining performance of Ti (N, C)–Al2O3-coated cemented carbide insert have been comprehensively...
Ceramic cutting tools are widely used particularly in high-speed machining of difficult-to-machine materials. However, using cutting fluid with these ceramic tools significantly reduces tool life. Therefore, the inclusion of a cooling/lubrication method into the process to improve the machining performance of ceramic tools will make machining efficiency much more effective. The aim of this study is...
The present study aims to investigate the tool wear mechanism of TiAlN-/NbN-coated tungsten carbide insert during end milling of hard Ti alloy under cryogenic treatment at 24 h and 48 h. The output responses are examined by looking at the flank wear, tool wear mechanism, elemental composition analysis, cutting force and vibration acceleration signal. A 12–23% and 4–11% reduction in the flank wear...
Minimum quantity lubrication (MQL) is a method which consumes lubricant at a minimum level. In this research work, the usage of copper nanofluids with MQL in turning on EN24 steel is presented. The experiments were performed based on L18 orthogonal arrays by varying the cutting speed, feed rate and environment such as oil with flood lubrication (Oil + FL), oil with minimum quantity lubrication (Oil...
In recent years, a new generation of composite materials has been introduced as metal matrix composites (MMCs) in order to simultaneously provide higher strength and stiffness. Industrial interests resulted in deep investigations and researches on machinability of MMCs and especially in the field of high-speed machining. High-speed machining processes offer a higher machining efficiency and reduced...
The aim of this study is to investigate the tool wear on friction stir processing of Al7075 base nanocomposite. The silicon carbide nanopowder was used as a reinforcing phase. The effects of input parameters including rotation speed, traverse speed and the pass number on the tool wear, microhardness and the topography were studied through the response surface methodology. Each of the input process...
The accuracy of machining force relies on the accuracy of the cutting force coefficients which are determined by calibration experiments and are related to cutting tool–workpiece material couple. To this end, a mechanistic model was established to anticipate machining forces that occurred during micro-milling under different tool overhang lengths. This study assumed that the cutting force coefficients...
CNC milling of curved surfaces is a common task in the manufacture of molds and dies of products used in various industrial sectors. Notably, in recent years, the use of hard milling has helped manufacturers to obtain these parts with shorter lead times, since the part is machined in a single setup without the problems caused by part distortions from the tempering process. In this work, cylindrical...
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