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.
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