(1) When sharpening each edge surface separately, use the tip of each edge as the benchmark and keep the edge as the principle, and then grind the rake angle (no need to grind if there is no chipping), the relief angle, and the secondary relief angle ( If a large cutting volume requires better strength, it is recommended to increase the edge wedge angle) and edge inclination angle in front of the sharpening tool.
(2) The relevant angle selections are relief angle 6° to 8°, (secondary relief angle 30° to 45°) and edge inclination angle 1° to 3°. The selection of the relief angle depends on the hardness of the workpiece. The greater the hardness of the material, the smaller the angle. The principle of selecting the angle of the blade inclination is that all four blades must be concave towards the middle, and the middle of the blade must not be convex. Otherwise, the milled plane will definitely be uneven, and the more concave the middle of the blade, the better. In fact, all four blades are concave toward the middle. The flatter the angle, the better the roughness accuracy. At this time, the deeper the processing depth (such as greater than 2mm but within the allowable range), the better the roughness accuracy will be, because the entire cutting edge will participate in the cutting, and the resulting surface quality will be better.
(3) After the sharpening is completed, stand the tungsten steel milling cutter on a platform. If the axis is vertical, all the blade tips can be flush, and the deflection angle of the blade can be evenly centered, so that it can meet the requirements. At this time, you can also use a 90° square ruler on a flat plate to correct it. After laying it flat, observe whether there is a gap or whether the gap is uniform between the milling cutter and the square ruler. Generally, first observe the two relatively high feet (the two feet that touch the bottom first). If they are not vertical, grind the higher feet until the two opposite feet are the same height (that is, vertical). At this time, the two feet If there is a height difference between the two opposite legs, the milling cutter will swing. At this time, lower the two higher feet at the same time. Similarly, rotate the milling cutter 90° to observe the verticality of the other two opposite legs, and finally make the four legs touch the bottom at the same time and make the milling cutter vertical. Milling cutter after sharpening.
In manual sharpening, it is not easy to grasp the height and angle of the blade. It varies from person to person during training. Just pay attention to grinding a little back angle, but it must be concave in the middle. In this way, even if the cutting edge is uneven, as long as the edge Just keep the tip at the highest point, which can also ensure that the sharpened tool can be milled normally. In addition, if it is not necessary to clean the inner cavity, you can also grind the chamfer of more than 0.2mm at the tool tip to increase the strength of the tool tip.
