| Superalloy is widely used in various fields because of it’s fine physicochemical properties. However, there is a difficult problem for the traditional grinding method how to process it effectively because it has characteristics of heavy toughness plasticity and strong seizing and low grinding efficiency. Using the traditional method of machining processing not only has a large amount of labor, complex technology and high cost, but also may simply not be processed. On the basis of analyzing the present situation of production of superalloy material at home and aboard meanwhile studying abundant references, this dissertation presents research on combined machining of electrical discharge grinding. Electrical discharge grinding is developed on the basis of EDM, which principle of ablating metals is generally a combination of EDM and grinding machining and the form of exercise is similar to the traditional grinding.Combined machining mechanism was analyzed systematically based on development of combined machining model and machining mechanisms of each process. Pointing out that grinding machining and electrical discharge machining benefit each other in combined machining. Grinding removes discharge metamorphic layers, reduces microcrack and enhance the surface quality. EDM soften the workpiece material in terms of the microscale,which can reduce grinding force and enhance the machining efficiency.In this subject, we set superalloy as the research object, and put forward a new method of EDG The following content is researched:(1) Special electrode-grinding wheel is designed for the new method of combined machining and it’s characteristic parameter is researched and identified;(2) Completing the transformation of the electric discharge grinding machine; The mechanism of EDG was analyzed systematically;(3) According to the processing surface morphology and roughness, the distinction of processing surface formation mechanism is verified be between EDG and ordinary grinding.(4) Referring to the grinding force of relevant information, the grinding force mathematical models of an abrasive grit in EDG were founded, which is studied from the aspect of cutting deforming force. Then the normal grinding force and the combined machining force is tested, and the influence of process parameters on the grinding force is also an analyzed. |
