镍钛合金心血管支架电解抛光流场仿真及试验

Simulation and Experiment on Flow Field of Ni-Ti Alloy Cardiovascular Stent Electropolishing

针对不同转速对电解抛光镍钛合金心血管支架流场分布的影响特点,利用ANSYS软件对电解抛光心血管支架过程中电解液的流速分布进行了仿真,分析了电解液速度场及涡流场对电解抛光心血管支架去除机理的影响规律,并通过试验验证了其仿真结果的正确性。结果表明,随着转速的增加,速度场分布均匀,涡流变化小,电解液更新及时,电解产物可及时排出,加工精度提高,抛光后的心血管支架表面完整性好;但当转速过高时,涡流分布区域明显增大,较多气体析出,导致速度场分布不均匀且不连续,加工精度低,抛光后的心血管支架表面完整性差。

In view of the influence of different rotational speeds on the flow field distribution of electro-polished Ni-Ti alloy cardiovascular stents, the ANSYS software was used to simulate the flow velocity distribution of electrolyte during electro-polished cardiovascular stents. The velocity field and eddy current field of electrolyte were analyzed. The influence of the mechanism of electro-polished cardiovascular stent removal was verified, and the correctness of the simulation results was verified by experiments. The results show that with the increase of the rotational speed, the velocity field distribution is uniform, the eddy current changes are small, the electrolyte is updated in time, the electrolysis products can be discharged in time, the processing precision is improved, and the surface integrity of the polished cardiovascular sent is good;however, when the rotational speed is too high, the eddy current distribution area is obviously increased, more gas is precipitated, resulting in uneven and discontinuous velocity field distribution, low processing precision, and poor surface integrity of the polished cardiovascular stent.