Abstract
This work investigates the applicability of Taylor’s model on the drilling of CFRP using uncoated WC-Co tools, by assessing the influence of cutting speed (Vc) on tool wear. Two different resins, possessing low and high glass transition temperatures (Tg), and two different reinforcements, high strength and high modulus woven fabrics, were combined into three different systems. Flank wear rate gradient exhibited to be more reinforcement dependent, while the actual flank wear rate showed to be sensible also to the type of resin. In terms of tool life, all CFRP systems adjusted into a power-type tool life vs. cutting speed curve through the full range of cutting speeds (1,000 RPM to 18,000 RPM). Therefore, Taylor’s model can be applied to estimate the tool life in the drilling of CFRP using uncoated WC-Co tools with good accuracy.
Highlights
The machining of fibre reinforced plastics became a field of study since the utilisation of these materials increased, due to their superior specific mechanical properties (Bhatnagar et al, 1995; Dandekar and Shin, 2012; Konig et al, 1985; Liu et al, 2012)
Values of flank wear as a function of spindle speed in the drilling of carbon fibre reinforced plastic (CFRP) composites
Based on the experimental results obtained in drilling of three different CFRP systems using uncoated WC-Co tools, on a wide range of cutting speeds (20–360 m/min) at a fixed feed rate of 0.05 mm/rev; the following conclusions can be extracted:
Summary
The machining of fibre reinforced plastics became a field of study since the utilisation of these materials increased, due to their superior specific mechanical properties (Bhatnagar et al, 1995; Dandekar and Shin, 2012; Konig et al, 1985; Liu et al, 2012). The improvement of the productivity in machining operations is strongly associated with the reduction of tool replacement time, which lays on the ability to accurately predict the tool life. At this point, mathematical models represent an essential tool to optimise this important parameter. In 1907, Taylor developed a mathematical model, based on empirical results, that is able to provide a good prediction of tool life (Taylor, 1907). This model establishes a correlation between the tool life and the cutting speed: Vc ⋅T n = C (1)
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