For parts with large machining allowance, in order to make them have better heat dissipation conditions during processing, and avoid heat concentration, symmetrical machining should be used during processing. If a piece of 90mm thick sheet needs to be machined to 60mm, if the other side is milled, the other side will be milled, and the flatness will be 5mm. Once the symmetrical processing is repeated, each side is processed twice. The final size guarantees a flatness of 0.3mm.

If there are multiple cavities on the plate parts, it is not advisable to use a cavity and a cavity order processing method during processing, which is easy to cause deformation of the parts due to uneven force. Multi-layer processing is used, each layer is processed into all the cavities at the same time, and then the next layer is processed to make the parts evenly stressed and reduce deformation.

Reduce cutting force and cutting heat by changing the amount of cutting. Among the three factors of cutting amount, the amount of backing knife has a great influence on the cutting force. If the machining allowance is too large, the cutting force of one pass will be too large, which will not only deform the parts, but also affect the rigidity of the machine spindle and reduce the durability of the tool. If you reduce the amount of back-to-back knives, the production efficiency will be greatly reduced. However, high-speed milling in CNC machining can overcome this problem. While reducing the amount of back-feeding, as long as the feed is increased correspondingly and the speed of the machine tool is increased, the cutting force can be reduced and the machining efficiency can be ensured.

The order of the knife must also pay attention to it. Roughing emphasizes the improvement of processing efficiency and the pursuit of resection rate per unit time. Generally, up-cut milling can be used. That is, the excess material on the surface of the blank is cut at the fastest speed and in the shortest time, and the geometric contour required for finishing is basically formed.