駆動型ロータリ切削による難削材の高能率加工におけるMQLの効果 : —工具温度と切りくず凝着—

概要

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In rotary cutting of Inconel718 (AMS5663), which is solution treated and age-hardened to HRC 45, this study clarifies the cutting speed achieving both higher efficiency and longer tool life, and prevents adhesions on the cutting edge and machined surface. Dry and MQL rotary cutting tests were carried out using coated carbide tools with an infrared thermal imaging camera. Cutting speeds were set up to 300 m/min, which is almost ten times higher than the speed recommended for conventional single point turning. At higher cutting speeds, less adhesions and subsequently less chippings on the tool rake face were observed, due to the larger amount of the cutting heat caused per unit time. Additionally, at the cutting speed of 300 m/min, the flank wear was small, due to the smallest amount of heat influx to the cutting tool in tested cutting speed range. Severe chips adhesions on both the cutting edge and the machined surfaces were observed in dry rotary cutting. However, in MQL rotary cutting, cutting fluid which is delivered to the cutting edge, improved lubricity of the tool-chip interface and prevented the adhesions.