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标题：Simulation and experiment of ECM accuracy of cooling holes considering the influence of temperature field
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作者：Zhaolong Li ; Wangwang Li ; Bingren Cao 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2022
卷号：35
页码：102112
语种：English
出版社：Elsevier B.V.
摘要：Electrochemical machining (ECM) is an essential method for machining gas film cooling holes in high-temperature resistant nickel-based alloys. However it is difficult to directly measure the temperature of the machining area of the cooling hole during ECM, which leads to a significant error between the simulation and the experimental data on the machining accuracy of the cooling hole. Based on the convective heat transfer model and the k-ε turbulence model, this paper establishes a simulation model of the machining accuracy of the ECM cooling hole considering the influence of the temperature field. The influences of machining voltage, electrolyte concentration, electrolyte inlet flow rate, and tool cathode feed rate on the electrolyte temperature distribution in the machining area and on the machining accuracy of the cooling holes were simulated and analyzed by COMSOL Multiphysics software. Experimental research was done to investigate the influence of craftsmanship parameters on the machining accuracy of cooling holes. The simulation and experimental results show that there is a significant error between the simulation data and the experimental data for the machining accuracy of cooling holes without considering the influence of the temperature field, and the simulation data of the machining accuracy of the cooling hole considering the influence of temperature field is consistent with the experimental data. The simulation model considering the influence of the temperature field, has high prediction accuracy for the machining accuracy of ECM cooling holes, which is of great significance to improve the machining accuracy of cooling holes.
关键词：ECM Craftsmanship parameters Temperature field Machining accuracy Cooling hole