Study on highly efficient machining by small-diameter radius end mill (2nd report)-effect of pick feed on machining characteristic in the reciprocating cutting

The purpose of this research is to collect basic data in high speed machining aiming at further higher efficiency of die processing by high speed milling. The machining center with both the maximum rotation speed of about 160,000 min ! and the maximum feed speed of 15,000 mm/min was used as the ultra-high speed milling. Moreover, the radius end mill which is advantageous in terms of cutting efficiency as compared to the ball end mill was used as a tool. In the previous report, machining characteristics in face cutting and side cutting were investigated. As a result of cutting at a cutting speed of 500 m/min, the flank wear of the end cutting edge in side cutting was larger than that of the face cutting, and it was found that face cutting was more effective. In this report, in order to improve efficiency of high speed milling, effects of pick feeds of up cutting and down cutting on tool wear and machining characteristics were investigated after cutting pre-hardened steel NAK 55 by TiAlN-coatcd carbide radius end mill. Flank wear of the tools after up cutting was less than down cutting when the pick feed was smaller than 0.1 mm, which tendency changed when the pick feed was larger than 0.3 mm. The flank wear of tools after the irregular pick feed reciprocating cutting when the pick feed were 0.1 mm in up cutting and 0.3 mm in down cutting respectively was less than that of tools after the regular reciprocating cutting.