How to minimise tool wear in EDM? 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. But the thermal conductivity will be 10-15% greater than with a hardened tool steel. 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. They also found that an increase in the TiB 2 leads to an increase in thermal conductivity. 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 … However, tool steels that provide thermal conductivity up to 35 Btu/(hr•ft⋅°F) , commercially known as high thermal conductivity steels (HTCS), should be considered. 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. 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, Low thermal conductivity and high specific heat, Did not receive the code? 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. Due to the material’s surprising melting point, graphite is frequently used to make … 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. Next Question. Cross section illustrating microcracks in the white layer. executive, Q Copper Wirewas the original EDM wire. 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. If the same EDM approach is used regardless of the work metal, the result could be vastly different. has the high conductivity value and is the area that is affected by the EDM process instead of the carbide itself. EDM has a high capability of machining the accurate cavities of dies and molds. For experimentation they implemented response surface methodology. Then there are options in aluminum and alloys with much greater thermal conductivity that can have a big payback in cycle time. final, CS In Electrodischarge Machining (EDM), if the thermal conductivity. Program, Privacy Answer 6. 1. The thermal conductivity of a material is a measure of its ability to conduct heat.It is commonly denoted by , , or .. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. 10. In electrodischarge 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 low and high respectively. Moreover, a profile on the electrode must be provided based on the desired profile. Electrode wear is dependent of factors like polarity, thermal conductivity, melting point of electrode, duration and intensity of spark discharges, types of power supplies used, the type of work material used in relation to the tool material, dielectric flow in the machining zones.