A Study of the Surface Forming Accuracy with a Local Convex Umbilical Structure When CNC Milling

This paper describes an experimental investigation that looked at the effect of several technological parameters on the precision of generating a surface with a local convex umbilical structure when using a high-speed CNC milling machine. The test sample is made of heat-treated S50C steel and is designed on the surface of the flashlight reflector plastic injection mold core. AgieCharmilles’ MIKRON UCP 600 machining center was used for testing, and Mitsubishi carbide solid ball-end cutters were used. The study employed the Taguchi L9 experimental design to examine the impact of three factors, namely sidestep, feed rate, and cooling lubrication type, on the precision of the forming process. The experimental results suggest that sidestep has the greatest influence (54.7%), followed by lubrication type (28.8%) and feedrate (13.4%). The study further demonstrates that, within the experimental range, the best machining regime for achieving the highest forming accuracy is sidestep at 0.1mm, feed rate at 400mm/min, and coolant at flushing.