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The titanium alloy blade material of a certain type of machine is TC4. Because of its low specific density, high specific strength and corrosion resistance, it has become the main body of the compressor blade in the advanced aeroengine. The titanium alloy blade material is TC4, which is a typical α+β type two-phase alloy. The blade blank is a forged piece with a margin, which is a difficult material. The shape of the blade is complicated, the blade body surface is thin, the profile area is large, and the blade body profile is a space twisted surface composed of coordinate points. The profile of each section of the blade body surface is different, and the precision is high. Therefore, it cannot be formed by forming milling, and only CNC milling or electrolytic machining can be used. The NC milling processing method is improper, which may cause deformation of the parts, causing surface burns, excessive residual stress on the machined surface, and easy occurrence of waste. Electrolytic processing is a non-contact small gap electrochemical reaction process, no stress, no deformation, and is especially suitable for batch production of blades.
Although the principle and process of electrolytic processing of titanium alloy blades have commonalities with the electrolytic processing of general materials, they also have their particularities. To realize the electrolytic processing of titanium alloy blades, it is not only necessary to solve the problem that the processing surface is easy to form a passivation film, which is difficult to process and affect the surface quality. At the same time, it is also necessary to solve the problem that the electrolyte is easy to be electrolytically processed due to the large profile of the blade and the complicated shape. The uneven distribution of the flow field causes flow marks on the machined surface. Therefore, controlling the process parameters of the electrolytic process, controlling the flow field, and performing various anti-corrosion protection measures on the blade mounting plate are to ensure the machining accuracy and surface quality of the parts. Complete the focus of process research.
In terms of structure, the titanium alloy blade has a thin wall, a strip edge plate at both ends, a space curved surface, and a complicated shape; on the material, the blade stack is cut. The five-axis numerical control milling process has large tool loss, high cost, long processing cycle and large equipment occupation: improper processing method, easy to cause defects such as surface burn, processing deformation and excessive residual stress on the machined surface, and the surface quality is poor. The subsequent manual polishing and polishing amount is large, and the production efficiency is low. However, the use of electrolytic machining is more suitable for the performance of its process. Because electrolytic processing is the electrochemical dissolution process of anode metal, it is not limited by the mechanical properties of the material, the surface quality is good, no burr, no residual stress on the surface to be processed, no cold work hardening layer, no plastic deformation, no recast layer, No microcracks, low surface roughness. It is especially suitable for the processing of difficult-to-cut materials. It is suitable for the production of thin-walled parts, space curved surfaces and complex parts. It has the advantages of low cost, high quality, high efficiency and no loss of tool cathode during processing. Comprehensive technical and economic analysis, titanium alloy blade surface forming processing using electrolytic processing has significant advantages.
Foreign countries have carried out in-depth research and experiment on the electrolytic processing of blades, and their comprehensive economic effects are better than the use of precision forging blanks and rolling defects. For example, the automatic processing line of electrolytic processing invested by the British company RR company in the 1980s, that is, all the profiles of the blade body is precisely formed on a 360 °C electrolytic processing equipment, and it is still the blade actually used outside the net. The most advanced one in electrolytic processing equipment is now used in the United States and Germany. It can be seen that the use of electrolytic machining of the blade profile has an inestimable economic effect. However, China still stays at the level of the 1980s and belongs to semi-finishing. Therefore, it is necessary to carry out research work in this area.
In this test, a certain type of titanium alloy blade profile was taken as the research object, and the research and exploration of profile electrolysis processing technology was carried out. A large number of process tests were completed, and the electrode electrolytic machining technology was continuously improved and improved, and the blade electrolysis was improved. Processing technology level.
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