Up-milling and down-milling, which are all belonging to milling processing of tungsten alloy, because the
cutting thickness when cutting into the workpiece is different, and the contact
length between the tooth and the workpiece is different, so the degree of wear
of the milling cutter is different. When down-milling, the durability of the
milling cutter is 2 to 3 times higher than that of up-milling, and the surface
is rough The degree can also be reduced. But down milling is not suitable for
milling hard-skinned workpieces. The power consumption of down milling is
smaller than that of up milling. Under the same cutting conditions, the power
consumption of down milling is 5% to 15% lower. At the same time, down milling
is also more conducive to chip removal. Generally, down milling should be used
as much as possible to improve the surface finish (reduce roughness) of the
processed parts and ensure dimensional accuracy. However, when there is a hard
layer, slag accumulation on the cutting surface, and significant unevenness on
the surface of the workpiece, such as processing a forging blank, the
up-milling method should be used.
More differences are, when down milling, the cutting thickness
becomes thinner, and the cutter teeth cut into the unmachined surface, which is
beneficial to the use of the milling cutter. In up-milling, when the cutter
teeth of the milling cutter contact the workpiece, they cannot cut into the
metal layer immediately, but slide a short distance on the surface of the
workpiece. During the sliding process, due to strong friction, a large amount
of heat will be generated, and at the same time, the surface to be machined It
is easy to form a hardened layer, which reduces the durability of the tool,
affects the surface finish of the workpiece, and brings disadvantages to
cutting. In addition, during up-milling, since the cutter teeth cut from bottom
to top (or from the inside to the outside) and cut in from the hard surface
layer, the cutter teeth are subjected to a great impact load, and the milling
cutter becomes dull faster, but the cutter teeth cut in There is no slippage in
the process, and the worktable will not move during cutting.
If you have any inquiry of WHA processing, please
feel free to contact us:
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