OBRABOTKA METALLOV

Introduction. The development of modern engineering necessitates the creation of materials with a combination of properties such as strength, corrosion resistance, heat conductivity, heat resistance, wear resistance, etc. In the manufacture of new types of products with a complex profile, bimetallic materials are widely used. For processing such products, it is advisable to use electrophysical processing methods, one of which is the technology of copy-piercing electrical discharge machining (EDM). Currently, the EDM method is one of the most common methods for processing modern materials. The paper is devoted to improving the efficiency of the EDM of bimetallic materials such as steel-copper. Subjects of research are: unevenness of the material removal of the treated surface, the roughness parameter during the EDM of a steel-copper type bimetallic material under various modes of electric discharge machining. The aim of the work is to increase the efficiency and accuracy of the EDM process of complex-profile bimetallic products electrode tool (ET) with various physical and mechanical properties. Methods. Experimental studies were carried out according to the classical experiment. For the experiments, a copy-piercing electrical discharge EDM machine Smart CNC was used. As a bimetallic processed product, a steel substrate with a deposited coating was used. The base material is steel 09G2S, the surfacing material is M1 copper. As electrode electrodes used: steel 20; duralumin grade D16; copper M2. Results and Discussion. A theoretical model is developed that allows one to calculate the amount of removal of the bimetallic material for steel-copper removal depending on the regimes of EDM and material ET. The convergence of the theoretical model with the results of experimental studies is 15%. An experimental study was made of the wear of ET during the EDM of a bimetallic steel-copper material depending on the modes of EDM and the material of the ET. It is established that during EDM of copper ET in the med and max modes, the wear of ET is minimal and amounts to 0.03 - 0.05 mm, respectively. The roughness parameters are calculated and the treated surface of the bimetallic steel-copper EDM bimetallic material is analyzed at different modes of processing ET with various electrophysical properties.

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