【作者】 王震； 万敏； 孟宝； 赵睿； 张逸云；

【Author】 Wang Zhen;Wan Min;Meng Bao;Zhao Rui;Zhang Yiyun;Beihang University;

【机构】 北京航空航天大学；

【摘要】 高温合金GH4169毛细管是新一代高超声速航空发动机换热系统的关键部件,但因其结构尺寸微小,直径0.88mm,壁厚0.05mm,采用传统拉拔成形工艺所获得毛细管表面质量较低,易产生断裂失效等问题。考虑到超声振动在宏观尺寸塑性加工中的诸多优点,本文研发了一套超声振动场辅助微成形系统,利用该系统将超声振动场引入到高温合金毛细管微拉拔工艺中,并进一步研究超声振动对材料微成形性能及成形质量的影响规律。结果表明,在超声振动场作用下,1020,1050,1080℃三种热处理状态毛细管的拉拔成形力都有了明显的降低,同时表面质量都得到了提升。更多还原

【Abstract】 GH4169 micro-scale tube is a key component of the new generation of hypersonic aero-engine. Due to the micro-dimension, the diameter is 0.88 mm and wall thickness is 0.05 smm, the surface quality of micro-scale tube obtained by traditional drawing process cannot always meet the standards, always resulting in fracture failure. Considering the advantages that ultrasonic vibration have in macro-dimension plastic forming process, an ultrasonic vibration assisted micro-forming experimental platform is developed. By imposing ultrasonic vibration on the drawing process of GH4169 micro-scale tube, the influence of ultrasonic vibration on the formability and surface quality is investigated and studied. It shows, under ultrasonic vibration field, the forming forces of micro-scale tube with heat treatment 1020,1050,1080℃ are obviously decreased and the surface quality is improved.更多还原