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Investigation of tool wear mechanism and tool geometry optimization in drilling of PCB fixture hole

Xiaohu Zheng (Shanghai Jiao Tong University, Shanghai, China)
Dapeng Dong (Shanghai Jiao Tong University, Shanghai, China)
Lixin Huang (Shanghai University of Engineering Science, Shanghai, China)
Xibin Wang (Beijing Institute of Technology, Beijing, China)
Ming Chen (Shanghai Jiao Tong University, Shanghai, China)

Circuit World

ISSN: 0305-6120

Article publication date: 18 November 2013

722

Abstract

Purpose

The paper aims to investigate tool wear mechanism and tool geometry optimization of drilling PCB fixture hole.

Design/methodology/approach

An experimental study was carried out to investigate the chip formation and tool wear mechanism of drilling PCB fixture holes. Two types of drill with different types of chip-split groove were used in this study. The performances of these two types of drill bots were evaluated by tool wear and the shapes of chips.

Findings

The chips of drilling fixture holes contain aluminum chips from the cover board, copper chips from the copper foil, discontinuous glass fiber and resin from the CFRP. Feed rate and drilling speed have a great influence on the chip morphology. Abrasive wear of the drill lip is the main reason of the fixture drill bit in drilling PCB, and micro-chipping is observed on the tool nose and chisel edge. The influence of distance between the chip-split groove and drill point center on the axial force and torque is not obvious.

Research limitations/implications

In this paper, hole wall roughness and drilling temperature were not analyzed in the optimization of drilling parameters. The future research work should consider them.

Originality/value

This paper investigated the mechanism of burr formation and tool wear in drilling of PCB fixture holes. Tool geometry was optimized by adding chip-split grooves.

Keywords

Citation

Zheng, X., Dong, D., Huang, L., Wang, X. and Chen, M. (2013), "Investigation of tool wear mechanism and tool geometry optimization in drilling of PCB fixture hole", Circuit World, Vol. 39 No. 4, pp. 195-203. https://doi.org/10.1108/CW-06-2013-0021

Publisher

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Emerald Group Publishing Limited

Copyright © 2013, Emerald Group Publishing Limited

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