Simulation Of The Temperature Field In Wire Electrical Discharge Machining

Electrical Discharge Machining in gas(dry-EDM,or gas-EDM)is expected to become one of green processing methods,Dry-WEDM has lots of advantages,such as low surface roughness,narrow discharge gap,non-polluted and so on.EDM is playing an irreplaceable role in many cutting process and finish machining.Meanwhile,There is a great of difference between traditional WEDM and dry WEDM.At present,research into Dry EDM is few in number,so that some phenomena have not been explained.It is necessary to carry out the concerned researches.In view of the problem of single-pulse discharge thermal filed in EDM,physical model of single pulse EDM is built,and the model took heat conduction,convection and material characteristics in pulse process into account.Suitable heat resource form has been selected and the transient thermal field of single pulse in gas was analyzed.After thermal analysis,the molten part was protruded by the pressure of plasma and it simulated using fluid analysis,assuming the molten part was incompressible viscous flow.The pressure of plasma had the Gaussian distribution and diameter increased with time same as heat source.According to the relation between evaporation temperature and evaporation pressure,to simulation electrical erosion of the melt crater was studied.Temperature increment and local erosion of the wire electrode have much concern with the decrement of the wire strength and the wire breakage.Using the ANSYS software to do the temperature field simulation,two dimension transient temperature distribution is determined.Looking for the main factors of influence silk loss and reduce the electrode wire loss significantly.