TC4钛合金圆筒件超声振动辅助热拉深工艺

Ultrasonic Vibration-Assisted Thermal Deep Drawing of TC4 Titanium Alloy Cylindrical Parts

摘要:

针对TC4圆筒件在热拉深过程中的破裂和制耳等质量问题，提出了超声振动辅助成形方法。通过超声振动辅助拉伸、滑动摩擦实验，确定超声振动对TC4热性能及界面摩擦性能的影响。通过探究不同温度条件下固定尺寸坯料的拉深力、拉深试件表面质量、壁厚分布和凸耳形态等，确定了超声振动对TC4圆筒件成型过程及质量的影响；最后通过不同温度条件下的变尺寸极限拉深实验，得到了超声振动辅助TC4圆筒件的极限拉深系数及试件有效高度。结果表明，TC4圆筒件热拉深过程，通过施加超声振动辅助，不仅能有效降低试件拉深力，还可以减小试件的制耳率，提高壁厚分布均匀性，有效提高了TC4圆筒件的极限拉深比和拉深试件有效高度。

Abstract:

To address quality issues such as cracking and earing during the thermal deep drawing of TC4 titanium alloy cylindrical parts, an ultrasonic vibration-assisted forming method was proposed. The effects of ultrasonic vibration on the thermal performance and high-temperature interfacial friction behavior of TC4 titanium alloy were studied by ultrasonic vibration-assisted tensile and sliding friction experiments. By analyzing the drawing force, surface quality, wall thickness distribution, and earing morphology of the fixed-dimension blank under different temperature conditions, the influence of ultrasonic vibration on the forming process and forming quality of TC4 cylindrical part was clarified. Finally, through variable-dimension limit drawing experiments under different temperature conditions, the limit drawing coefficient and the effective height of the TC4 cylindrical part assisted by ultrasonic vibration were obtained. The research findings indicate that applying ultrasonic vibration during the thermal deep drawing of TC4 cylindrical parts can not only effectively reduce the drawing force and earing ratio, but also improve the uniformity of wall thickness distribution, significantly enhancing the limiting drawing ratio and effective height of the drawn specimens.