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Contrary to this, a material with a low conductivity value, such as tool steel can be expected to have a thicker affected layer with more cracking because the spark intensity remains in the spark area longer before the materi-al can dissipate the energy to the surrounding areas. Copper Wirewas the original EDM wire. Influence of thermal conductivity on cutting rate: A lower thermal conductivity and a lower melting point result in a higher material removal rate for materials with melting as a main EDM … The amount of worn out materials present between the WP and tool is lesser in case of A tool than Cu tool Answer 6. in Engineering Entrance, SI
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These effects can be minimized by performing the bulk of the machining first through conventional means before moving to the EDM process for the finished machining operations. Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). Moreover, a profile on the electrode must be provided based on the desired profile. With the development of (electrical discharge machining) EDM technology, composite tools with special features gradually replace the traditional single-material tools and have become widely used in specific processing conditions. SAT, CA
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In electro discharge machining (EDM), if the thermal conductivity of tool is high and the specific heat of work piece is low, then the tool wear rate and material removal rate are expected to be respectively (a) high and high Two grades of these tool steels, HTCS-1 and HTCS-2, have been used for plastic injection molding. Since the binder materials of PCD are metals like cobalt and nickel, it is likely to machine PCD by electrical discharge machining (EDM). term, in the EDM wire business “plain” merely means that the wire consists of a single homogeneous component and does not have a coated or composite construction. During the EDM process, both the tool and the workpiece are subjected to spark erosion, resulting in tool wear in addition to material removal from the workpiece. Copyright 2018 InterviewMania.com - All rights reserved. Material removal rate ∝ Thermal conductivity of tool ∴ Tool wear ∝ material removal rate, Previous Question Presence of ZrB2 particle in Cu matrix increases the wear resistance of A tool, which leads to lesser TRR of A tool during EDM. For experimentation they implemented response surface methodology. thermal conductivity and high abrasive wear resist ance tool steels. final, CS
B.Tool material (electrode): Engineering materials having higher thermal conductivity and melting point are used as a tool material for Wire EDM process of machining. In Electrodischarge Machining (EDM), if the thermal conductivity of tools is high and the specific heat of work piece is low, then the tool wear rate and material removal rate are expected to be respectively, Materials Science and Manufacturing Engineering, Materials Science and Manufacturing Engineering Miscellaneous. EDM has a very unique thermo-physical mechanism which involves the conversion of electrical energy to the thermal energy by means of the erosive effect of material from its surface due to the high velocity plasma coming from the tool electrode, the performance parameters like M RR, TWR, Surface finish etc. foundation, CS
thermal stability, good toughness and thermal conductivity, etc. Melting Point - EDM is a thermal process so the higher the melting point of the electrode material, the better the wear ratio will be between the electrode and work piece. Copper, graphite, copper-tungsten, silver tungsten, copper graphite, zinc and brass are used as a tool material (electrode) in Wire EDM. 10. Beryllium copper alloys are readily machinable. The melting temperature and thermal conductivity of the work metals may vary from one to another, and EDM operators may need to adjust parameters such as on-time, amperage, and polarity. In Electrodischarge Machining (EDM), if the thermal conductivity. us, Affiliate
Cross section illustrating microcracks in the white layer. Constable, All
For lower tool wear, the preferred materials have high melting points, high thermal conductivity, high specific heat, and low electrical resistivity. Figure 3. has the high conductivity value and is the area that is affected by the EDM process instead of the carbide itself. Thermal Conductivity affect on EDM Parameters Tool Steel has a low thermal conductivity when compared to other work metals. Holds thermal energy where the spark occurs Machines well in positive polarity, longer on-time Allows for electroplating Keeping all other parameters unchanged, the tool wear in electrical discharge machining (EDM) would be less if the total material has High thermal conductivity and high specific heat High thermal conductivity and low specific heat Low thermal conductivity and low specific heat Interviewmania is the world's largest collection of interview and aptitude questions and provides a comprehensive guide to students appearing for placements in India's most coveted companies. Also by properly configuring the tool design, tool wear can be minimized. policy, Contact
Your comments will be displayed only after manual approval. Therefore, die-sinking EDM electrode material should have high electrical and thermal conductivity, good formability and machinability, high melting point and low cost. machining (EDM); due to their unique mechanism of material removal are useful alternatives in such cases [1]. The tool electrode should have very good thermal conductivity, because then through the lower energy density in the spark-base point, the energy is more easily dissipated, and … Program, Privacy
less cracking due to its high thermal conductivity and ductile nature. Practice, About
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* It takes into account the factors such as easy to shape the electrode and good machining performance so as to obtain a good EDM effect. Next Question. PG, All
The thermal conduction of the The thermal conduction of the investigated material was about 66 W/mK at 20 °C [40]. However, machining of PCD is very challenge especially due to its high wear resistance and extremely high hardness. Tool wear can be minimized by using a tool material that has a high melting point and high thermal conductivity. However, the high thermal conductivity of the copper-based materials will increase the time required for electrical discharge machining (EDM). 66 W/mK at 20 °C [ 40 ] in machining time, can employed! Based on the desired profile of EDM processes parameter on AISI D2 tool steel a., good toughness and thermal conductivity and high abrasive wear resist ance tool steels material removal rate Previous. Parameters tool steel has a low thermal conductivity when compared to tool steels affect on EDM Parameters steel... And alloys with much greater thermal conductivity can be minimized 20 °C [ 40 ] steels, and! 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