1. Surface trenching
It is mainly about the selection of boundary line and face.
The machining area of the tool path is based on the principle of taking the selected surface within the selected boundary as the end surface and all the places that the tool can go from the high point of the reference to the low point of the reference. If the selected surface is well controlled, it is the whole surface, and the boundary can only be the area to be processed. If there is no surface, the extension is less than the interval of half the cutter diameter, because there is sufficient margin for other surfaces, it will be automatically protected; if the selected surface is well controlled, the extension is low line, because there is less than one R gong at the low point of the control.
Selection of cutter: if the cutter can’t enter the helix or oblique line, or the machining area can’t enter the cutter, seal it up, and leave it to be cut twice.
Before the smooth knife, it is necessary to make all the areas that have not been cut thick, especially the small angle, including the two-dimensional angle, the three-dimensional angle and the sealed area, otherwise the knife will be broken. Secondary cutting: it is usually used to select the boundary line with three-dimensional cutting, flat bottomed cutter, and it is used for those who can use plane cutting and appearance cutter path. Under the condition of no damage to other surfaces, the center of the tool to the selected boundary is usually not refined, depending on the situation with a quick two-way angle, spiral feed, angle of 1.5 degrees, height of 1. When the form of excavation is strip, oblique feed is used when spiral cutting is not possible, usually open the filter, especially when the surface is rough, the feed plane cannot be low, so as to avoid hitting the knife, the safe height cannot be low.
Withdraw knife: usually do not use relative withdraw knife, use absolute withdraw knife, when there is no island, use relative withdraw knife.
2. Plane slotting: milling all kinds of plane, concave and flat groove. When milling part of the open plane, it is necessary to determine the boundary. In principle, it can feed (more than one diameter), the opening part is more than half of the diameter, and the periphery is closed tightly.
3. Appearance: when the selected plane is suitable for appearance layering, use the appearance layering to lift the knife (plane appearance). When the lifting point and the lower cutting point are one point, the z plane does not need to lift the knife normally, although the relative height is not used; the correction target is usually right (along the knife).
4. Tool path configuration of mechanical correction: the correction number is 21, and the computer correction is changed to mechanical correction. The feed is vertical feed, and the area where the knife cannot pass is increased by R without margin.
5. Contour appearance: it is suitable for tight closed surface, open surface. If there are four circles, the item surface shall be sealed. If there are four circles or not, the boundary and height shall be selected (the arc feed must be rough). It is used for rough condition: the machining interval in any plane is less than one cutter diameter, and if there is more than one cutter diameter, the larger cutter or twice contour appearance shall be used.
6、 Curved streamline: with good contrast of average and neatness, suitable lightsaber can replace contour appearance for many times.
7. Radial knife path: suitable for the condition that there is a large hole in the middle (less use). Attention: when the knife is not sharp, the knife is too long. When the workpiece is too deep, it should not go up or down around; the surfaces on both sides of the sharp corner of the workpiece should be divided into two knife paths, which should not go out. When the knife is smooth, the edge should be lengthened (use arc to advance or retreat the knife).
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