Cavitation-based soft abrasive flow processing method

Cavitation-based soft abrasive flow processing method
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基于空化的软磨料流加工方法

DOI:
10.1007/s00170-020-05836-3
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发表时间:
2020-08
影响因子:
3.4
通讯作者:
TAN Da-peng
TAN Da-peng
中科院分区:
工程技术3区
文献类型:
--
作者:
PAN Ye;JI Shi-ming;TAN Da-peng

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为了提高软磨料流加工的加工效率和表面质量,提出了一种基于空化的软磨料流加工方法,并设计了一种利用文丘里管结构产生空化效应的软磨料流加工工具。空化产生的微射流加速了磨粒对工件的冲击,提高了磨料流的处理效率。在此基础上,对加工工具的流场进行了设计。在Schnerr-Sauer空化模型和混合计算方法的基础上,建立了CSAF的两相流体动力学模型,揭示了CSAF的空化机理和演化规律。数值结果验证了所提出的处理方法的可行性,有助于选择流道的最佳结构尺寸。建立了基于粒子图像测速技术(PIV)的空化观测平台,获得了不同流动参数下的空化图像,验证了模拟结果的有效性。加工区域的最大流速为22.8m/S,最大流速为46.2m/S。在自行研制的砂轮抛光加工实验平台上,与砂轮抛光的对比实验结果表明,该加工方法获得了更好的表面质量,材料去除效率提高了52%。
To improve the processing efficiency and surface quality of soft abrasive flow (SAF) processing, we proposed a cavitation-based soft abrasive flow (CSAF) processing method and designed a CSAF processing tool, which uses the Venturi tube structure to create a cavitation effect. The microjet produced by cavitation accelerates the impact of abrasive particles on the workpiece and improves the processing efficiency of abrasive flow. Based on that, we designed the flow field profiles of the processing tool. We built a two-phase fluid dynamic model for CSAF to reveal the cavitation mechanism and evolution regularities based on the Schnerr-Sauer cavitation model and the mixture calculation method. The numerical results validated the feasibility of the proposed processing method, helped choosing the optimal structure sizes of flow passage. A particle image velocimetry (PIV)–based observation platform is established, the cavitation images with different flow parameters are obtained, and the validity of the simulation results is validated. The maximum flow velocity on the processing area in the SAF tool is 22.8 m/s, and the maximum flow velocity of the CSAF tool is increased to 46.2 m/s. With a developed CSAF processing experiment platform, the comparative experiment results with SAF showed that the proposed CSAF processing method achieves better surface quality and increases the material removal rate by 52%.
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