Gas compensation-based abrasive flow processing method for complex titanium alloy surfaces
Gas compensation-based abrasive flow processing method for complex titanium alloy surfaces
复制标题
基于气体补偿的复杂钛合金表面磨料流加工方法
DOI：
10.1007/s00170-017-0400-4
复制
发表时间：
2017
影响因子：
3.4
通讯作者：
Yuan Zhi-min
中科院分区：
文献类型：
--
作者：
Zhang Li;Wang Jin-shun;Tan Da-peng;Yuan Zhi-min
为了解决复杂钛合金表面软磨料流加工的均匀性和效率问题，提出了一种基于气体补偿的软磨料流加工方法。通过约束模块，在钛合金表面建立封闭通道，注入气相，增强磨粒流湍流强度。以受限流道为目标，基于可实现k-ε模型和混合模型，建立了GCAF三相流体力学模型。得到了约束流道内磨料流场的速度和动压力分布，揭示了气体补偿引起的湍流变化规律。数值结果表明，该方法可以增强磨料湍流强度，改善动压分布均匀性。开发了GCAF处理实验平台，并进行了实验研究。结果表明，该方法可获得较好的加工效率和均匀性，平均表面粗糙度小于Ra 0.3，微峰和微谷的表面形貌可分别小于50和10 μm。
To resolve the problems of uniformity and efficiency of soft abrasive flow (SAF) processing for complex titanium alloy surfaces, a gas compensation-based abrasive flow (GCAF) processing method is proposed. By the constrained modules, an enclosed flow passage covering the titanium alloy surface is built up, in which the gas phase is injected to enhance the turbulence intensity of abrasive flow. Taking the constrained flow passage as the objective, a three-phase fluid mechanic model for GCAF is set up based on the realizablek-εmodel and the mixture model. The profiles of velocity and dynamical pressure of abrasive flow field in the constrained flow passage are obtained, and the turbulence variation regulars caused by gas compensation are revealed. Numerical results show that the proposed method can strengthen the turbulence intensity of abrasive and improve the distribution uniformity of dynamical pressure. A GCAF processing experimental platform is developed, and the experiments are performed. The results prove that the proposed method can obtain better processing efficiency and uniformity, the average surface roughness is less than Ra 0.3, and the surface topograph of micro-peak and micro-valley can reach less than 50 and 10 μm, respectively.