Study on Compatibility between Wave-motion Ultrasonic Milling and Post Treatment Process of Ti-6Al-4V

doi:10.3901/JME.2023.23.320

Abstract

Abstract: In the field of aerospace difficult-to-cut alloy machining, wave motion ultrasonic milling (WMUM) has been demonstrated as a new finish machining method which can simultaneously improve machining accuracy and surface strengthening during cutting. In engineering applications, post treatment processes such as heat treatment and pickling are necessary to be applied to aviation titanium alloy components to eliminate surface tensile residual stress and facilitate defect detection. However, the influence of these post treatment processes on the strengthening effect obtained by WMUM has not been revealed. In order to better comprehend the compatibility between WMUM and post-treatment process, experiments on both WMUM and conventional side milling of Ti-6Al-4V are conducted, and surface integrity parameters such as residual stress, subsurface morphology and microhardness are characterized. The results show that compared to that under conventional milling-heat treatment-pickling process, the workpiece surface in WMUM under heat treatment-milling-pickling process still retains a compressive residual stress of 252.01 MPa. Therefore, this paper proposes a heat treatment-WMUM-pickling process for aviation titanium alloy components, which is compatible with the existing post-treatment process and can retain the strengthening effect of wave milling.

Key words: wave-motion ultrasonic milling, heat treatment, pickling, compatibility, surface integrity

CLC Number:

V261

LIU Yihang, ZHOU Li, HAN Xiong, ZHANG Mingliang, GENG Daxi, LIU Lianxing, YIN Xiaoming, JIANG Xinggang, ZHANG Deyuan. Study on Compatibility between Wave-motion Ultrasonic Milling and Post Treatment Process of Ti-6Al-4V[J]. Journal of Mechanical Engineering, 2023, 59(23): 320-330.

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