• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (18): 61-72.doi: 10.3901/JME.2020.18.061

• 材料科学与工程 • 上一篇    下一篇

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液氮冷却低温切削镍基合金Inconel 718的试验与仿真

李建明, 王相宇, 乔阳, 付秀丽, 郭培全   

  1. 济南大学机械工程学院 济南 250022
  • 收稿日期:2019-10-09 修回日期:2020-06-01 出版日期:2020-09-20 发布日期:2020-11-17
  • 通讯作者: 郭培全(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为高效加工和与先进装备制造。E-mail:oss_guopq@ujn.edu.cn
  • 作者简介:李建明,男,1995年出生。主要研究方向为低温切削加工。E-mail:1093729532@qq.com;王相宇,男,1988年出生,博士,讲师。主要研究方向为高效加工和低温切削加工。E-mail:me_wangxy@ujn.edu.cn;乔阳,男,1984年出生,博士,副教授,硕士研究生导师。主要研究方向为粉末冶金制备与高效加工。E-mail:me_qiaoy@ujn.edu.cn;付秀丽,女,1978年出生,博士,教授,博士研究生导师。主要研究方向为高效加工与表面精度控制。E-mail:me_fuxl@ujn.edu.cn
  • 基金资助:
    山东省高等学校科技计划(J17KZ001,2019KJB021)、山东省重点研发计划(2019GGX104096)和国家自然科学基金(51675230)资助项目。

Experiment and Simulation Research on Cryogenic Cutting of Inconel 718

LI Jianming, WANG Xiangyu, QIAO Yang, FU Xiuli, GUO Peiquan   

  1. School of Mechanical Engineering, University of Jinan, Jinan 250022
  • Received:2019-10-09 Revised:2020-06-01 Online:2020-09-20 Published:2020-11-17

摘要: 低温切削加工技术可以有效改善高温合金加工过程中存在的切削温度高、加工质量差等问题。对镍基合金Inconel 718进行低温条件下的静态拉伸试验和Hopkinson压杆试验,测试Inconel 718合金低温力学性能,构建合金低温本构模型,采用单因素切削试验与有限元仿真相结合的方法,研究低温切削加工Inconel 718合金的切屑形貌、切削温度场和应力场。试验结果表明,在低温条件下,Inconel 718合金的强度提高,延伸率和塑性降低;修正后的Johnson-Cook本构模型可以准确地描述Inconel 718合金在低温条件下的动态力学性能;低温切削试验表明低温冷却导致切屑的锯齿化程度增大;仿真结果表明低温切削有效降低了切削区域的温度,改善了切削变形区的应力分布。与传统切削加工方式相比,低温切削技术对高温合金的切削加工性有很明显的改善。

关键词: Inconel 718, 低温力学性能, 本构模型, 低温切削, 有限元仿真

Abstract: Cryogenic cutting can effectively solve the problems of high cutting temperature and poor surface quality in the processing of superalloy alloys. Static tensile test and Hopkinson test of Inconel 718 under low temperature conditions are performed to test the low-temperature mechanical properties of the Inconel 718, and a low-temperature constitutive model of the superalloy is constructed. The method of combining single-factor cutting experiment and finite element simulation is used to study the chip morphology, cutting temperature field and stress field of Inconel 718 in cryogenic cutting. The experimental results show that under low temperature conditions, the strength of Inconel 718 increased, and the elongation and plasticity reduced. The modified Johnson-Cook constitutive model can accurately describe the dynamic mechanical properties of Inconel superalloy under low temperature conditions. The cryogenic cutting test show that the low-temperature cooling will lead to an increase of the aliasing degree of the chips. Simulation results show that cryogenic cutting effectively reduces the temperature of the cutting area and improves the stress distribution in the cutting deformation area. Compared with the traditional cutting method, the cryogenic cutting technology has a significant improvement in the machinability of superalloy alloys.

Key words: Inconel 718, cryogenic mechanical properties, constitutive model, cryogenic cutting, simulative analysis

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