Milling processing is divided into down milling and up milling. Down milling is a milling method in which the rotation direction of the contact part of the milling cutter and the workpiece is the same as the cutting feed direction. Up-milling is a milling method in which the rotating direction of the contact part of the milling cutter and the workpiece is opposite to the cutting feed direction. Tungsten alloy material is relatively hard, and both down milling and up-cut milling are available, but up-cut milling is more suitable.
The main differences between the two are
different stress characteristics and different chip changes. The cutting edge
of down milling is mainly subjected to compressive stress. The cutting edge of
up milling is mainly subjected to tensile stress. The chip of down milling
changes from thickness to thin, the cutting edge and the workpiece are mutually
squeezed, and the relative sliding friction is small, which can reduce the
tooth wear, surface hardening, and surface roughness. The chip of up milling
changes from thin to thick, which is generated when the blade cuts in Strong
friction generates more heat than down milling and hardens the machined
surface.
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