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Frontiers of Mechanical Engineering

Front Mech Eng Chin    2009, Vol. 4 Issue (1) : 60-63
Investigation on drilling-grinding of CFRP
Yanming QUAN(), Wenwang ZHONG
School of Mechanical Engineering, South China University of Technology,Guangzhou 510641, China
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It is difficult to machine polymer matrix composites reinforced by carbon fibre, and the hole-making process is the most necessary machining process for composite plate products. Conventional drills have a very short life in the drilling of this kind of composites and the quality of the hole is very poor. In this paper, the cemented or plated diamond core tools are tested to make holes in carbon fibre/epoxy composite plates. The effects of machining parameters, cooling and chip removal on the tool life, and the hole quality are investigated. Results indicate that the material removal mechanism of the two kinds of diamond tools is not like the cutting effect of the conventional solid twist drilling but similar to that of grinding. Satisfactory effects in making holes in the composites are obtained— quite acceptable machined hole quality, low costs, and long wear-resistant endurance.

Keywords composites      drilling-grinding      cemented/plated diamond      tool life      machined quality     
Corresponding Authors: QUAN Yanming,   
Issue Date: 05 March 2009
 Cite this article:   
Yanming QUAN,Wenwang ZHONG. Investigation on drilling-grinding of CFRP[J]. Front Mech Eng Chin, 2009, 4(1): 60-63.
Fig.1  Top: Plated diamond core drill; Middle: Cemented diamond core drill; Bottom: Plated solid drill
Fig.2  Plated core drill and work piece, no pad is used
Fig.3  HSS twist drill wear badly
Fig.4  Long cracks in hole exit made by HSS twist drill
Fig.5  Hole exits made by plated solid drill
Fig.6  Hole exits made by plated core drill (upper row) and by cemented core drill (bottom row; the first left one is a hole core)
Fig.7  Plated core drill and cemented core drill after making 60 holes severally
Fig.8  Fig. 8 Bad hole exits resulting from faster feed (upper row: made by cemented core drill; bottom row: made by plated core drill)
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