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Most of the gantry machining center milling is done by the inverse milling method. However, crush milling should be used as far as possible to achieve better processing results. Because the gantry machining center is milling upright, a strong friction occurs before the blade is cut in, resulting in hardening of the machining surface, making it difficult to cut the next blade.
When the gantry milling machine is milling, the width of the milling should be approximately equal to 2/3 of the milling cutter diameter. This ensures that the cutting edge can be cut into the workpiece immediately from the beginning, with almost no friction. If it is less than 1/2 of the cutter diameter, then the blade will begin to "friction" the workpiece again, because the cutting thickness will become smaller when cutting in, and the feed per tooth will also decrease due to the narrowing of the radial cutting width. As a result of "friction", tool life is shortened. For carbide tools, it is advantageous to increase the feed per tooth and reduce the depth of cut.
Therefore, when rough milling, if the radial cutting width is smaller than the milling cutter radius, increasing the cutting amount, the tool life will be improved, and the processing time of the gantry milling machine will be shortened. Of course, finishing requires the surface of the workpiece to be smooth, so the amount of cutting should be limited.
Trimming this radial milling width to determine the ratio of milling cutter diameter to radial milling width is best done on a high-precision gantry machining center in order to observe changes in the workpiece surface roughness while adjusting the ratio.
What are the milling methods for gantry machining centers?
Milling of gantry machining centers is mainly divided into up-cut milling and down-cut milling. What is the difference between up-cut milling and down-milling methods? Next Xiaobian will give you a brief introduction!