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Influence of chisel edge thinning on helical point micro-drilling performance

  • Haixin Guo
  • Zhiqiang Liang
  • Xibin Wang
  • Tianfeng Zhou
  • Li Jiao
  • Longlong Teng
  • Wenhua Shen
ORIGINAL ARTICLE

Abstract

Chisel edge thinning can effectively improve the drilling performance of austenitic stainless steel. Four kinds of helical point micro-drills, each with a thinned chisel edge of a distinct length, are fabricated based on the mathematics models of the micro-drill by using a six-axis computer numerical control tool grinder. Micro-drilling experiments on 304 stainless steel are conducted. Drilling performance is evaluated according to the measured and observed micro-hole machining quality, chip morphology, thrust force, and tool wear of the micro-drill tip. With a decrease in the chisel edge length, the micro-holes drilled using thinned micro-drills have small entrance burrs, roundness errors, and regular shapes, which are attributed to an increase in self-centering capability. Owing to increased equivalent chip thickness and different directions of chip flow, micro-drills with thinned chisel edge can generate more small-size chips and improve chip breaking. In addition, the inner cutting edge with a positive rake angle replaces the chisel edge with a negative rake angle to cut the workpiece, significantly reducing the chip curl, thrust force, and tool wear of micro-drills. However, helical point micro-drills with critical chisel edge lengths by thinning exhibit less thrust force and tool wear than do helical point micro-drills with no chisel edge because of the increase in the uncut chip width of the micro-drill. Thus, with the selected parameter range, the optimal helical point micro-drill is the micro-drill with a specific chisel edge length by thinning to improve drilling performance.

Keywords

Chisel edge thinning Stainless steel Micro-drill Drilling performance 

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Notes

Funding information

This work was supported by the National Natural Science Foundation of China (No. 51575049), National Basic Research Program of China (No. 2015CB059900), and Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology (No. 2015KM005).

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  • Haixin Guo
    • 1
  • Zhiqiang Liang
    • 2
  • Xibin Wang
    • 2
  • Tianfeng Zhou
    • 2
  • Li Jiao
    • 2
  • Longlong Teng
    • 2
  • Wenhua Shen
    • 2
  1. 1.School of Mechanical EngineeringBeijing Institute of TechnologyBeijingPeople’s Republic of China
  2. 2.Key Laboratory of Fundamental Science for Advanced MachiningBeijing Institute of TechnologyBeijingPeople’s Republic of China

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