Milling method of gantry machining center
The milling of gantry machining center is mostly completed by reverse milling. However, we should try our best to use down milling, which will achieve better processing effect. When the gantry machining center is in reverse milling, the blade will produce strong friction before cutting in, resulting in the hardening of the working surface and making it difficult for the next cutter tooth to cut in.
When the gantry milling machine is in forward milling, the milling width should be about 2 / 3 of the milling cutter diameter, which can ensure that the cutting edge can cut into the workpiece immediately at the beginning, and there is almost no friction. If it is less than 1 / 2 of the milling cutter diameter, the blade will start to "rub" the workpiece again, because the cutting thickness becomes smaller when cutting in, the feed per tooth will also decrease due to the narrowing of radial cutting width. As a result of "friction", the tool life is shortened. For cemented carbide tools, increasing the feed per tooth and reducing the cutting depth are more favorable.
Therefore, in rough milling, if the radial cutting width is less than the radius of the milling cutter, the tool life will be increased and the processing time of the gantry milling machine will be shortened. Of course, finish milling requires a smooth surface of the workpiece, so the amount of tool feed should be limited.
It is better to adjust the radial milling width and determine the ratio of milling cutter diameter to radial milling width on a high-precision gantry machining center, so as to observe the change of workpiece surface roughness while adjusting the ratio.