China Mechanical Engineering ›› 2022, Vol. 33 ›› Issue (05): 569-576.DOI: 10.3969/j.issn.1004-132X.2022.05.005

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Effects of Phase States on Clean Cutting Performance and Surface Integrity of NiTi Alloys

YU Jianhang;YAN Pei;FAN Lei;GU Huiqing;JIAO LiQ;IU Tianyang;WANG Xibin   

  1. School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081
  • Online:2022-03-10 Published:2022-03-22

相态对镍钛合金清洁切削性能和表面完整性的影响

余建杭;颜培;范雷;顾慧卿;焦黎;仇天阳;王西彬   

  1. 北京理工大学机械与车辆学院,北京,100081
  • 通讯作者: 颜培(通信作者),男,1984 年生,副教授。研究方向为难加工材料先进加工、抗疲劳制造、智能制造。E-mail:pyan@bit.edu.cn。
  • 作者简介:余建杭,男,1996 年生,硕士研究生。研究方向为镍钛形状记忆合金的切削加工。E-mail:3120190418@bit.edu.cn。
  • 基金资助:
    国家重点研发计划(2018YFB2002200);
    国家自然科学基金(52075040,52175376)

Abstract: Aiming at the high-efficiency and high-speed clean machining of NiTi alloys, through clean cutting technologies such as dry cutting, carbon dioxide and liquid nitrogen cryogenic cutting, the cutting experiments of NiTi alloys in different phases were designed and the cutting performance and surface integrity indicators were compared and analyzed, and the influence rules of material phases and cutting parameters on the cutting processes of NiTi alloys were studied. The results show that the cutting force of the martensitic phase is the largest and that of the austenitic phase is the smallest, the former may reach 1.04~3.84 times of the latter; there are four elements Ni, Ti, O and C in the chips, mainly TiO2 and NiCO3 form, the formation of the two compounds changes with the cutting temperature, which in turn causes the chip color to change with the processing parameters; when the feed rate is small, the surface roughness Ra value of the austenitic phase is the largest, and the Ra value of the martensitic phase is the smallest, the former may reach 1.24~1.66 times of the latter; under martensitic phase cutting conditions, when the cutting speed is as 130 m/min, the feed rate is as 0.05 mm/r, and the cutting depth is as 0.2 mm, Ra value reaches the minimum value of 0.73 μm. 

Key words: nickel-titanium(NiTi) alloy, phase state, cutting performance, surface integrity

摘要: 针对镍钛合金的高效高速清洁加工,通过干切削、二氧化碳及液氮低温切削等清洁切削技术,设计了镍钛合金在不同相态下的切削实验,对切削性能、表面完整性指标进行了对比分析,研究了材料相态和切削参数对镍钛合金切削加工的影响规律。研究结果表明,马氏体相切削力最大,奥氏体相切削力最小,前者可达后者的1.04~3.84倍;切屑中存在Ni、Ti、O、C四种元素,主要以TiO2和NiCO3形式存在,两种化合物的生成量随切削温度变化,进而导致切屑颜色随工艺参数发生变化;当进给量较小时,奥氏体相加工表面粗糙度Ra值最大,马氏体相Ra值最小,前者可达后者的1.24~1.66倍;在马氏体相切削条件下,当切削速度为130 m/min、进给量为0.05 mm/r、切削深度为0.2 mm时,Ra值达到最小值0.73 μm。

关键词: 镍钛合金, 相态, 切削性能, 表面完整性

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