Study On The Technological Parameter For Micro Electrical Discharge Machining High-melting And Hot-sticking Alloys

In the field of aerospace, national defense, transportation and others, many of the key components often involve use stainless steel, invar, titanium alloy and other high melting and thermal viscous alloy. These kinds of parts often have micro scale structures, such as atypical group of hole, microgroove, micropore and micro-channel, etc. Micro-EDM has incomparable superiority, but it has random and complex. It is difficult to observe microphysical processes by test means, this paper analysis of high-melting and hot-sticking alloys materials removal in Micro-EDM processing by molecular dynamics. Aim at process parameters of high-melting and hot-sticking alloys Micro-EDM machining, a series of research activities were done. MD simulation and the optimization for multi-targeted technological parameters of high melting and thermal viscous alloy were investigated. The detailed contents in this article are as follows:The EDM discharge removals of cooper and titanium alloy were investigated by using molecular dynamics method. The results show that:The first part of the removed material becomes debris in the gap, the second part settles on the surface of the opposite electrode, and the last part returns to the surface of the electrode from which it was ejected. The different in three kinds of removed materials show that high-melting and hot-sticking alloys belong to difficult-to-machine materials. Aim at the distributions of the removed material which were quantitative analyzed using Molecular Dynamics; the effects of the parameters on performance objective were investigated by the simulation results under different energy density. The electrical parameters were analyzed by the simulation in the conditions of different energy density. The feed speed was analyzed by the simulation in the conditions of different feed speeds. The results prove that:the technological parameters for general material not apply to high-melting and hot-sticking alloys. So it is very necessary to do optimizing experiments for technological parameters of high-melting and hot-sticking alloys.According to the processing micro grooves on high melting and thermal viscous alloys, a particular processing law for three kinds of high-melting and hot-sticking alloys micro EDM was studied referred to orthogonal machining technique by machining time and electrode wear. The effects of the parameters on multiple performance objectives were investigated by multiple objective parameters optimization, and the optimization combination of multiple objectives is achieved. The results show that: the grey relational grade method based on orthogonal experiment can optimize machining time and electrode wear simultaneously, raises the efficiency and precision of micro-channel Micro-EDM, and can obtain a top-quality and high efficiency of micro-channel Micro-EDM.Therefore, the MD simulation of high melting and thermal viscous alloy micro EDM and research of the technical parameter were analyzed by this work was found to have an important influence on providing a high processing efficiency and improving the machining accuracy.