纳米孪晶立方氮化硼机械研磨机理研究

doi:10.3901/JME.2016.05.095

机械工程学报 ›› 2016, Vol. 52 ›› Issue (5): 95-100.doi: 10.3901/JME.2016.05.095

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纳米孪晶立方氮化硼机械研磨机理研究

靳田野¹, 陈俊云², 赵明慧², 王金虎³, 赵清亮³, 鹿玲¹

1. 燕山大学机械工程学院秦皇岛 066004;
2. 燕山大学车辆与能源学院秦皇岛 066004;
3. 哈尔滨工业大学机电工程学院哈尔滨 150001

出版日期:2016-03-05 发布日期:2016-03-05
作者简介:靳田野,男,1989年出生。主要研究方向为新型纳米孪晶材料切削刀具研制。E-mail：jintianye3030@163.com;陈俊云(通信作者),女,1983年出生,副教授,硕士研究生导师。主要研究方向为新型纳米孪晶材料刀具研制和高精度汽车零部件制造技术。E-mail：sophiacjy@ysu.edu.cn
基金资助:
* 国家自然科学基金资助项目(51205343和51105327)

Mechanical Lapping Mechanism of Nanotwinned Cubic Boron Nitride

JIN Tianye¹, CHEN Junyun², ZHAO Minghui², WANG Jinhu³, ZHAO Qingliang³, LU Ling¹

1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004;
2. College of Vehicles and Energy, Yanshan University, Qinhuangdao 066004;
3. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001)

Online:2016-03-05 Published:2016-03-05

摘要/Abstract

摘要： 为了将新型超硬纳米孪晶立方氮化硼(nt-cBN)材料制备成能够实现铁基金属材料,特别是硬度较高材料的精密及超精密切削刀具,针对机械研磨方法,从理论和试验角度分别对纳米孪晶立方氮化硼材料的机械研磨机理进行了研究。对纳米孪晶立方氮化硼材料动态脆塑转变临界研磨深度进行了理论分析及试验验证;基于临界研磨深度,实现了对该材料的塑性域精细研磨;利用理论计算及原子力显微镜表面检测结果,针对研磨后塑性沟槽深度及宽度,分析了研磨过程中塑性沟槽形成机理。研究结果表明,纳米孪晶立方氮化硼材料动态脆塑转变临界研磨深度为23.9 nm;使用0.5 μm金刚石研磨颗粒研磨材料表面粗糙度达到1.99 nm,PV值77.05 nm;研磨塑性沟槽深度理论最小值2.25 nm,与试验结果相吻合;研磨塑性沟槽宽度为固定、游离研磨颗粒共同作用的结果,宽度保持在亚微米级。因此,纳米孪晶立方氮化硼材料具有较好的可加工性,采用机械研磨方法能够实现较高精度表面的高效率加工。

关键词: 机械研磨, 临界研磨深度, 纳米孪晶立方氮化硼, 塑性沟槽

Abstract: In order to manufacture a nanotwinned cubic boron nitride (nt-cBN) cutting tool which is promising to cutting ferrous metal, especially for hardened steel, lapping mechanism is investigated with both theoretical and experimental methods. The dynamic critical lapping depth of nt-cBN is first calculated by theoretical analysis, and then proved through lapping experiments. Based on the critical depth, nt-cBN bulk is lapped in ductile regime and fine surface can be achieved. Moreover, aiming to reveal generation mechanism of the plastic grooves on lapped surface, both depth and width of the grooves are studied according to theoretical calculation and experimental results. It indicates that the dynamic critical lapping depth of nt-cBN is 23.9 nm, and surface roughness of lapped nt-cBN with 0.5 μm diamond grits is 1.99 nm and PV value is 77.05 nm. Additionally, the theoretical minimum groove depth on fine finished nt-cBN surface is 2.25 nm which was proved by experimental results, as well as the grooves' width in sub-micron scale is generated under the complicated reaction of free grits and fixed grits. Therefore, nt-cBN material has excellent machinability as compared to diamond, and can be machined by mechanical lapping with high efficiency and high precision.

Key words: critical lapping depth, mechanical lapping, nanotwinned cubic boron nitride, plastic groove

中图分类号:

TH162

靳田野, 陈俊云, 赵明慧, 王金虎, 赵清亮, 鹿玲. 纳米孪晶立方氮化硼机械研磨机理研究[J]. 机械工程学报, 2016, 52(5): 95-100.

JIN Tianye, CHEN Junyun, ZHAO Minghui, WANG Jinhu, ZHAO Qingliang, LU Ling. Mechanical Lapping Mechanism of Nanotwinned Cubic Boron Nitride[J]. Journal of Mechanical Engineering, 2016, 52(5): 95-100.

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纳米孪晶立方氮化硼机械研磨机理研究

Mechanical Lapping Mechanism of Nanotwinned Cubic Boron Nitride

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