• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (19): 204-211.doi: 10.3901/JME.2018.19.204

• 制造工艺与装备 • 上一篇    下一篇

非共轴螺旋后刀面微钻的五轴联动刃磨方法及其钻削性能研究

张素燕, 梁志强, 王西彬, 周天丰, 焦黎, 刘志兵, 颜培   

  1. 北京理工大学先进加工技术国防重点学科实验室 北京 100081
  • 收稿日期:2017-11-06 修回日期:2018-04-20 出版日期:2018-10-05 发布日期:2018-10-05
  • 通讯作者: 梁志强(通信作者),男,1984年出生,博士,副教授。主要研究方向为难加工材料切削磨削技术,微细刀具设计与制造技术。E-mail:liangzhiqiang@bit.edu.cn
  • 作者简介:张素燕,女,1989年出生,博士研究生。主要研究方向为微细钻削刀具设计与制造技术。E-mail:zsyangela@sina.com;王西彬,男,1958年出生,博士,教授,博士研究生导师。主要研究方向为先进切削磨削、精密微小型制造、绿色制造、生物加工与成形。E-mail:cutting0@bit.edu.cn
  • 基金资助:
    国家自然科学基金(51575049)和国家重点基础研究发展计划(973计划,2015CB059900)资助项目。

A 5-axis Coordinated Grinding Method of Non-coaxial Helical Flank Micro-drill and Its Drilling Performance Research

ZHANG Suyan, LIANG Zhiqiang, WANG Xibin, ZHOU Tianfeng, JIAO Li, LIU Zhibing, YAN Pei   

  1. Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081
  • Received:2017-11-06 Revised:2018-04-20 Online:2018-10-05 Published:2018-10-05

摘要: 微细钻头的几何结构是影响刀具钻削性能和微孔加工质量的关键因素。非共轴螺旋面钻尖由连续的螺旋后刀面组成,相比平面钻尖能有效的提高刀具的刃磨效率及其钻削性能。针对非共轴螺旋面钻尖,推导后刀面形成过程中螺旋运动发生线的位置方程,建立了基于砂轮和钻头接触线的后刀面数学模型。根据六轴数控工具磨床的运动原理,提出非共轴螺旋后刀面五轴联动刃磨方法。分析砂轮与螺旋槽之间的相对运动关系,提出微细钻头螺旋槽的数控加工方法。进行非共轴螺旋后刀面微钻的刃磨试验,验证了该刃磨方法的可行性。进而采用制备出的具有相同几何结构参数的平面、锥面和非共轴螺旋面微细钻头进行不锈钢钻削试验,结果表明非共轴螺旋面和锥面微钻的钻削力、后刀面磨损明显小于平面微钻,并且非共轴螺旋后刀面微钻的横刃磨损程度小于平面和锥面微钻。研究证实了所提出的五轴联动刃磨方法可以有效地制备出较高钻削性能的非共轴螺旋后刀面微细钻头。

关键词: 非共轴螺旋后刀面, 刃磨方法, 微细钻头, 钻削性能

Abstract: Drill point geometry is a most significant element for drilling performance and micro-hole quality. Non-coaxial helical drill point is characterized by a continuous helical flank surface, and its special geometry contributes to a better grinding efficiency and a superior drilling performance. The position equation of generating line of helical surface is obtained, and the mathematical model of contact line between helical drill flank and wheel is proposed. According to the motion of 6-axis CNC tool grinder, a 5-axis coordinated grinding method of helical drill flank is presented. Based on the relative motion of drill flute and wheel, a CNC grinding process of micro-drill flute is proposed. Then this grinding method is validated by fabricating the helical micro-drill. For the planar, conical and helical micro-drills with the same geometry parameters, the drilling experiments on austenitic stainless steel are conducted, and the drilling force and tool wear are measured and analyzed. The results show that the thrust force and flank wear of helical, conical drill point are smaller than that of planar drill point, and the chisel edge wear of helical drill point is smaller than that of planar, conical drill point. It is confirmed that the proposed grinding method is effective to fabricate the helical micro-drill with good drilling performance.

Key words: drilling performance, grinding method, micro drill, non-coaxial helical flank

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