Advanced burr-free hole machining using newly developed micro compound tool

This paper focuses on the efforts for minimization of burr formation and improvement of hole surface roughness following machining of micro through-hole. The main idea deals with the development of a micro compound tool consisting of two different parts: a micro flat drill (drilling part) and a micro diamond-electroplated-tool (grinding part). The finishing diameter of each drilling and grinding parts are 90 µm and 100 µm, respectively. Furthermore, the study also focuses on the effect of entrance taper of grinding part, drill diameter and web thickness. The used wokrpiece was made of stainless steel (SUS304) with a thickness of 100 µm. From the experiment, it was found that the tool having entrance taper, drill diameter and web thickness of 10/100, 90 µm and 50 µm, respectively, shows the best performance in hole machining especially in burr minimization. Furthermore, the developed micro compound tool showed significant better surface roughness and burr minimization compared to usual micro twist drill and micro flat drill.

[1]  David Dornfeld,et al.  Micro-Burr Formation and Minimization through Process Control , 2003 .

[2]  Jinsong Wang,et al.  Analysis and dimensional design of a novel hybrid machine tool , 2003 .

[3]  Bryan Kok Ann Ngoi,et al.  Vibration-Assisted Precision Machining of Steel with PCD Tools , 2003 .

[4]  Reimund Neugebauer,et al.  Ultrasonic application in drilling , 2004 .

[5]  Gary M. Bone,et al.  Burr size reduction in drilling by ultrasonic assistance , 2005 .

[6]  N. Takezawa,et al.  Effects and possible role of atmospheric molecules in ultra-micro-cutting of monocrystalline silicon , 2006 .

[7]  Gwo-Lianq Chern,et al.  Study on burr formation in micro-machining using micro-tools fabricated by micro-EDM , 2007 .

[8]  Kyung-Young Jhang,et al.  Nonlinear ultrasonic techniques for nondestructive assessment of micro damage in material: A review , 2009 .

[9]  Zhenlong Wang,et al.  Micro electrical discharge machining of small hole in TC4 alloy , 2009 .

[10]  Abdulkadir Erden,et al.  An Experimental Study on the Geometry of Microholes in Microelectric Discharge Machining , 2009 .

[11]  Chong Nam Chu,et al.  Micro ECM with ultrasonic vibrations using a semi-cylindrical tool , 2009 .

[12]  P. Shore,et al.  Ion beam, focused ion beam, and plasma discharge machining , 2009 .

[13]  A. Senthil Kumar,et al.  A multiprocess machine tool for compound micromachining , 2010 .

[14]  Kyle Jiang,et al.  Micro fabrication of stainless steel micro components using soft moulding and aqueous slurry , 2010 .

[15]  Dong Wang,et al.  A study on micro-hole machining of polycrystalline diamond by micro-electrical discharge machining , 2011 .

[16]  Jeong Hoon Ko,et al.  Cusp error reduction under high speed micro/meso- scale milling with ultrasonic vibration assistance , 2011 .

[17]  Muhammad Aziz,et al.  Novel micro deep drilling using micro long flat drill with ultrasonic vibration , 2012 .