• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (3): 179-186.doi: 10.3901/JME.2016.03.179

• 制造工艺与装备 • 上一篇    下一篇

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PCBN刀具切削高温合金锯齿形切屑形成机理

吴明阳,  赵旭,  计伟,  程耀楠,  刘利,  刘献礼   

  1. 哈尔滨理工大学机械动力工程学院  哈尔滨  150080
  • 收稿日期:2015-03-10 修回日期:2015-11-04 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: 吴明阳,男,1971年出生,教授。主要研究方向为难加工材料切削理论及刀具。 E-mail:13936161878@139.com
  • 基金资助:
    国家自然科学基金资助项目(51475128)

Generation Mechanism of Saw-tooth Chip in Turning of GH4169 with PCBN Tool

WU Mingyang  ZHAO XU  JI Wei  CHENG Yaonan  LIU Li  LIU Xianli   

  1. School of Mechanical Engineering, Harbin University of Science and Technology, Harbin 150080
  • Received:2015-03-10 Revised:2015-11-04 Online:2016-02-05 Published:2016-02-05

摘要: 高温合金被广泛的应用于航空航天工业中,它是一种典型的难加工材料,切削过程刀具磨损严重。PCBN刀具作为一种超硬刀具材料在加工高温合金方面具有较大潜能,但由于PCBN刀具没有断屑槽,故断屑困难。因此研究切削参数以及刀具磨损对切屑形成的影响规律对推进PCBN刀具的应用具有重要的意义。通过试验研究切削参数和刀具磨损对切削力、切屑宏观状态和切屑微观参数(切屑剪切角、切屑厚度、齿高和齿间角)的影响规律。试验结果表明:当切削速度为97 m/min,切削深度为0.1 mm,进给量为0.14 mm/r时,切屑的宏观状态最佳。并根据试验结果,确定了绝热剪切带的位置和两个切屑锯齿形成的关系,进而建立了PCBN刀具切削高温合金GH4169的锯齿形切屑的形成机理模型:当刀具运动到某一点开始出现绝热剪切带,继续运动到下一点,形成一个锯齿,继续运动将出现下一个剪切失稳。

关键词: GH4169, PCBN刀具, 刀具磨损, 切削力, 切屑形成机理

Abstract: Superalloys are applied in the aerospace industry, and it is one of classical difficult-to-cut materials, which cause the exacerbation of cutting tool wear. Polycrystalline cubic boron nitride (PCBN) is super-hard cutting tool material, which has a big potentiality in machining superalloys. However, there is no chip breaker on PCBN tool, so that it is difficult to break chip. Therefore, it is very important to research the relationship between the chip generations and both cutting parameters and tool wear for application of PCBN tools. The experiment was done to make sure the relationships cutting force, chip macro- sharp and micro-sharp with the cutting parameter and tool wear. The results demonstrate that the best chip macro sharp can be obtained when v=97 m/min, ap=0.1 mm and f=0.14 mm/r. Also the position of adiabatic shear band and the sequence between two saw teeth of chip based on the result of the test. Then the model of generation of saw-tooth chip is presented: in the process of cutting of GH4169 with PCBN tool, adiabatic shear band is generated when cutting tool is at a point, and then the saw tooth of chip is formed at a next point, after which the next adiabatic shear band can be generated.

Key words: chips, cutting force, GH4169, PCBN tool, tool wear

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