Abstract
In order to solve the problem of gap flow field divergence and poor forming accuracy in the electrochemical machining (ECM) titanium alloy inner helix, the pull reverse flow and pull downstream cathode physical models as well as the simulation models of machining gap flow field are established respectively in this paper. Different inclination angles of the liquid supply hole effected on the pull downstream cathode rotational flow field uniformity were explored. The results showed that the gap flow field distribution of the pull downstream cathode is better than pull reverse flow cathode, and the distribution of the rotational flow field formed when the inclination angle of the liquid supply hole achieves 40° is relatively uniform. Under the condition of voltage 12 V, cathode feed speed 15 mm/min, composite electrolyte 3%NaCl + 10%NaNO3 + 6%NaClO3, electrolyte temperature 30 °C, and electrolyte inlet pressure 2 MPa, the 800-mm length of titanium alloy inner helix sample was machined stably and reliably by the pull downstream cathode structure, which surface roughness is Ra0.8 μm.
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Funding
This work was financially supported by the Shaanxi Provincial Key Research and Innovation Team Project (Grant No. 2023-CX-TD-24), Shaanxi University Youth Innovation Team Project (Grant No. 20201020), Shaanxi Provincial Department of Education Youth Innovation Team Construction Research Project (Grant No. 21JP054, No. 22JP032), Xi’an Science and Technology Plan Scientist and Engineer Team Construction Project (Grant No. 23KGDW0003-2022), Shaanxi Provincial Department of Education Industrialization Cultivation Project (Grant No. 23JC041), and Shaanxi Provincial Youth Innovation Team Project (Grant No. 23JP069).
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Highlights
• The performance of titanium alloy is complex and very sensitive to the change of processing parameters and the accuracy is difficult to control, which brings great difficulties to manufacturing.
• The physical models of pull reverse flow and pull downstream cathode were established and studied the gap flow field distribution.
• In order to improve the forming accuracy of electrochemical machining we proposed a rotational flow field electrochemical machining method.
• The experimental results were consistent with the results of the machining gap flow field simulation.
• Using pull downstream cathode and rotational flow field for electrochemical machining is an effective method to improve the forming accuracy.
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Tang, L., Ma, Y., Xue, R. et al. Optimization and experimental study on cathode structure of electrochemical machining titanium alloy inner helix. Int J Adv Manuf Technol 130, 1141–1149 (2024). https://doi.org/10.1007/s00170-023-12757-4
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DOI: https://doi.org/10.1007/s00170-023-12757-4