Effect of hardening on the machinability of C22 steel under drilling operations using twist HSS drill bit

Contradictory effects of machining conditions on wear in the main cutting zones of the twist drill

“…Therefore discussion about the investigation on chisel wear in HSS twist drill bit has to be closely related to the behaviour of wear in cutting edges known as ank wear. As it has mentioned above, in a previous work the authors Mokas et al (2018) [1] have focussed their investigation on the behaviour of ank wear presuming that it is the most dominant phenomenon causing the degradation of the tool. However, chisel wear can also be an important factor in uencing the machinability of the C22 steel for in some cutting conditions.…”

“…The chemical composition and mechanical properties are respectively given in Table 1 and Table 2. The specimen preparation and the repartition of the holes to be drilled on each blank followed that described in previous work Mokas et al (2018) [1].…”

“…In a previous work, Mokas et al (2018) [1], have investigated the machinability of hardened C22 steel when executing drilling operation using twist drill bit. They have reported through their experimental results that when the cutting speed increases the tool life increases.…”

“…The aim of the present work is to bring more understanding about the behaviour of the machinability of hardened steel during drilling operation that has previously studied by Mokas et al (2018) in which the focussed on ank wear. Therefore, the present paper reconsiders the evolution of wear in twist drill bits with respect to both ank and chisel edges, in order to sort out the most dominant wear in drill edges.…”

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The present work is a ful lment study on previous contribution presented by Mokas et al (2018) through investigation on the effect of chisel wear on the machinability of hardened C22 steel under drilling operations using twist high-speed steel (HSS) grade drill bits. Therefore, the evolution of wear in twist drill bits with respect to both ank and chisel edges has been reconsidered in order to sort out the most dominant wear rate in drill edges.

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