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Reverse micro EDM (RMEDM), a contactless electro thermal micro machining process is extensively used for generating array of similar aspect ratio of protruded micro features. The drawback of this process is the formation of recast layer on the fabricated surface that has different mechanical and chemical properties as compared to the base material....
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Citations
... Various coating micro-texture processing technologies have also been developed in the application process of the tool coating micro-texture. The representative technologies include ion etching [15,16], lithography [17,18], EDM [19][20][21], laser processing technology [22][23][24] and so on. Electrical discharge machining (EDM), as a non-contact machining method, can produce various complex and non-standard micro-textures on the tool surface. ...
Coated cemented carbide currently represents most of all cutting tool inserts due to its unique combination of wear resistance and toughness. Surface texturing technology can give additional performance to reduce the tool’s wear and energy consumption. Using TiAlN-coated cemented carbide tools as the research object, the effects of femtosecond laser parameters (laser energy, scanning speed, scanning times) on the groove morphology of TiAlN-coated tools and the bonding state of coating and substrate were discussed. The study found that when the laser energy was 10 μJ, the scanning speed was 0.7 mm/s, and the number of scans was 5, the groove morphology was ideal, and the coating and the substrate combination remained unchanged. The influence of micro-groove texture on the tool wear mechanism was investigated by cutting test using the micro-groove texture tool produced by this group of process parameters. The flank wear value of inserts with micro-grooved texture decreased significantly by around 25%. This work provides practical data to support the femtosecond laser processing of TiAlN-coated tools. It is helpful to understand further the processing mechanism of a femtosecond laser on the micro-texture of coated tools.
... Experimental investigation shows that the overall dimension of microfine is higher in stainless steel than in copper material and performance measures such as MRR, OC and CR of both materials are mainly affected by current and pulse on time, further concluding that the optimum value of the parameter for OEC was T on (5 µs), T off (15 µs), I (4 A) and S at (4 µm/s) highest for both stainless steel and copper. Roy, Sarkar, and Balasubramaniam (2020) investigated the formation of a suitable recast layer in the machined surface by varying the aspect ratio of array-microfeatures fabricated in the Reverse-micro-EDM with taper blind hole as a tool. The result illustrated that 0.486 mm height of the microfeature array was fabricated with respect to the 0.5 mm hole depth and the thickness of the recast layer increases (20 μm, 30 μm and 35 μm) with the increasing height of the microarray feature. ...
Electrical discharge machining is a versatile machining technology that uses precisely directed sparks within the range of the dielectric fluid and between the electrodes to make electrically conductive products. The influence of different processing parameters on diverse metal matrix composites, including new reinforcing elements (silicon carbides, aluminium oxides and nitrides), and the modifications that occur as a consequence of each of these components are discussed in this article. As a result, new reinforcing materials and ways for optimising performance have emerged. The goal of this study is to provide analysts with research data that will allow them to effectively use EDM principles and, more particularly, to investigate process characteristics in order to enhance the process of advanced PMEDM operation.
... In the process of EDM, the recast layers are easily generated on the workpiece surface [3][4][5]. In the process of the interaction between the electric spark discharge and the workpiece, the partially molten workpiece was not expelled in time [6]. Under the cooling effect of the low-temperature spark oil, the partially molten workpiece rapidly crystallized and adhered to the machined surface, thereby forming a recast layer. ...
Titanium alloy has been widely applied in industrial fields because of its excellent material properties. Electrical discharge machining (EDM) is commonly technology for processing titanium alloy. When titanium alloy was processed by EDM, a recast layer was inevitably be produced on its surface, which can adversely affect the surface quality and working life. Focus on the above problem, this paper proposed to add B4C powders into the spark oil and cooperate with the tool electrode sloshing for powder mixed electrical discharge machining (PMEDM) of titanium alloy, which can reduce the thickness of the recast layer and thereby improve the quality of the machined surface. Firstly, B4C powders were mixed in the spark oil and the PMEDM of the titanium alloy was carried out. In this step, the thickness of recast layer was preliminarily reduced and the quality of machined surface was improved. Secondly, when the PMEDM of the titanium alloy was nearly completed, the tool electrode sloshed along the machine tool spindle within the EDM gap. Combining PMEDM with the tool electrode sloshing, the recast layer on the machined surface was further eliminated and the quality of machined surface was further improved. By adding 3000 mesh B4C powders into the spark oil, the paper carried out the PMEDM of titanium alloy combining with the tool electrode sloshing. Under the action of appropriate process parameters, the micro-groove structure with surface roughness Ra of 0.205 μm was obtained in the titanium alloy and the recast layer on the machined surface was almost invisible.
