Research On EDM And It's Computer Simulation Of Insulating Ceramics

Insulating ceramics are,because of its high-hardness,wearablity,high-temperature resistance,high-voltage resistance,insulativity and many other superior functions , considered one of the dominant materials to promote forward the industries in the 21st century, and expected to have widely engineering applications. However, there exist constraints in the manufacturing process from cutting raw materials to forming shapes, especially complex shapes because of their high hardness and brittleness.As it is almost not influenced by the combination mechanical properties of material,such as hardness,brittleness and so on, electrical discharge machining(EDM) is particularly suitable method for the conductive materials that is difficult for the ordinary machining methods.And EDM has been considered a good way to machining the high hardness material.However, for many years,people have always thought that the method can only machining the conductive materials but be impossibility to machining insulating ceramics and other insulating materials, moreover, there is no other way to forming the requested shape in addition to moulding before sintering for ceramic materialsIn this paper, the experimental studies of EDM of insulating ceramics Si3N4 are done by using the assisting electrode method. Owing to that EDM technology of insulating ceramics breakthroughs the traditional idea that EDM can only machining the conductive materials,and it is one of the new field in EDM. So this paper's useful tries can deepen the basic theory on EDM of insulating ceramics ,and advance the possibility of the technology into usability,and the research have filled the blank of this field in China. Based on lots of experimental research,using artificial neural network(ANN), the forecasting model of the processing effect in EDM of insulating ceramics Si3N4 is established,and the relevant simulation system software is written to do the research on EMD of insulating ceramics.The main research findings and innovations of the dissertation are summarized as follows:It is studied that the machining process on EDM of insulating ceramics by using the assisting electrode method,and analyzed that the machining mechanism on EDM of insulating ceramics.It is researched that the preparation method of the assisting electrode layer,and made that the assisting electrode layer which is low-cost, convenient and practical by using coating method successfully.It is studied that the cause of the forming electrical conductive layer and the conductive properties of the forming electrical conductive layer in EDM of insulating ceramics Si3N4, and the forming mechanism of electrical conductive layer is analyzed,moreover, the relationship between electrical conductive layer properties and machining electrical parameter,machining depth,the distance between giving electric power position and machining position is obtained.The machining speed in EDM of insulating ceramics Si3N4 is studied, moreover,the relationship between the machining speed and machining electrical parameter,electrode size,machining depth,the distance between giving electric power position and machining position is obtained.The machining quality in EDM of insulating ceramics Si3N4 is studied, moreover,the relationship between the surface roughness and machining electrical parameter,electrode size is obtained.The simulation technique on EDM of insulating ceramics Si3N4 is studied,and technology BP of ANN is used to establish the forecasting model of the processing effect in EDM of insulating ceramics Si3N4; Furthermore, The optimization of machining electrical parameter in EDM of insulating ceramics Si3N4 is carried out by using a combination of genetic algorithms(GA) and ANN technology.