Abstract
PurposeThe purpose of this paper is to present a clear picture of the challenges of micro drill bit and the developments of novel micro‐drill bits for flexible circuit boards, environmental‐friendly printed circuit boards (PCBs), high aspect ratio drill bit and ultra‐small micro drill bit, as well as the developments of geometry design of micro drill bit.Design/methodology/approachThe paper details the developments trend and challenges of micro drill and PCBs first. Then the current research status of novel micro drill bits for flexible circuit boards, environmental‐friendly PCBs, high aspect ratio drill bit, ultra‐small micro drill bit are described. Finally, the developments of geometry design and drilling process are reviewed.FindingsTo achieve excellent performance for drilling flexible PCB, a large helical angle, large flute/land ratio and small web thickness that guarantee the sharp evacuation capability, are adopted in drill bit design. A small helix angle and an appropriate primary face angle are employed for drill bit to process environmental‐friendly printed circuit boards. It is beneficial to implement big helix angle, small primary face angles and small point angles in the design of ultra‐small micro drill bit. An optimum web thickness and step feed should be taken into consideration in high aspect ratio drill bits design.Originality/valueThe paper reviews different solutions of micro drill bits for the state‐of‐the‐art PCB and the developments of geometry design of drill bit for printed circuit boards.
Subject
Electrical and Electronic Engineering,Industrial and Manufacturing Engineering
Reference36 articles.
1. Armarego, E.J.A. and Rotenbery, A. (1973), “An investigation of drill point sharpening by the straight lip conical grinding method”, International Journal of Machine Too Design and Research, Vol. 13, pp. 155‐182.
2. Aziz, M., Ohnishi, O. and Onikura, H. (2012), “Novel micro deep drilling using micro long flat drill with ultrasonic vibration”, Precision Engineering, Vol. 36, pp. 168‐174.
3. Chan, H.C. and Ehmann, K.F. (1998), “Development of curved helical micro‐drill point technology fro micro‐hole drilling”, Mechatronics, Vol. 8, pp. 337‐358.
4. Chen, H.Q. and Shi, H.Y. (2010), “High precision 3D modeling of PCB micro drill bit”, Tool Engineering, Vol. 44, pp. 40‐42.
5. Chen, Z.S. (2011), “The study of broken needle and drilling depth detection on high‐speed NC drilling machine”, Guangdong University of Technology, PhD dissertation, China.
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