1. Symmetrical processing method

For parts with large processing allowance, in order to make them have better heat dissipation conditions during processing and avoid heat concentration, symmetrical processing should be used during processing. If a 90mm thick aluminum sheet material needs to be processed to 60mm, if one side is milling immediately after milling the other side, a processing to the final size, the flatness of up to 5mm; If repeated feed symmetrical machining is used, each side is processed twice to the final size, which can ensure the flatness of 0.3mm.

2. Layered multiple processing method

If there are multiple cavities on the plate part, as shown in the following figure. When processing, it is not appropriate to use the sequential processing method of one cavity one cavity, which is easy to cause uneven stress and deformation of parts. The layered multiple processing is used, and each layer is processed to all cavities as much as possible at the same time, and then processed to the next level, so that the parts are evenly stressed and the deformation is reduced.

3. Appropriate selection of cutting parameters

Cutting force and cutting heat are reduced by changing cutting parameters. Among the three elements of cutting parameters, the amount of back cutting tool has great influence on cutting force. If the machining allowance is too large, the cutting force of a cutting tool is too large, it will not only deform the parts, but also affect the rigidity of the machine spindle and reduce the durability of the tool. If the amount of back cutting is reduced, the production efficiency will be greatly reduced. However, in CNC machining are high-speed milling, can overcome this problem. While reducing the amount of back cutting, as long as the feed is increased accordingly and the speed of the machine tool is improved, the cutting force can be reduced and the processing efficiency can be ensured.

4. Pay attention to the order of cutting

Roughing and finishing should use different cutting sequences. Roughing emphasizes on improving the processing efficiency and pursuing the removal rate per unit time, which can generally be used in inverse milling. That is, the excess material on the blank surface is cut off at the fastest speed and in the shortest time to basically form the geometric outline required by the finishing. And the emphasis of finishing is high precision and high quality, it is appropriate to use down milling. Because the cutting thickness of the cutter teeth gradually decreases from the maximum to zero during down-milling, the degree of work hardening is greatly reduced, and the degree of deformation of the parts is reduced.

5. The thin-walled parts are pressed twice

Thin-wall aluminum pipe aluminum square workpiece deformation due to clamping during processing, even finishing is difficult to avoid. In order to reduce the deformation of the workpiece to a minimum, the pressing part can be loosened before the finishing is about to reach the final size, so that the workpiece is free to return to the original state, and then slightly pressed, so that the workpiece can be just clamped, so that the ideal processing effect can be obtained. In short, the application point of the clamping force is best on the supporting surface, the clamping force should act in the direction of the workpiece rigidity, and the smaller the clamping force is, the better, under the premise of ensuring that the workpiece is not loose.

6. Drilling before milling processing method

When processing aluminum tube and aluminum square tube belt cavity parts, try not to let the milling cutter directly plunge into the part like a drill when processing the cavity, resulting in insufficient milling cutter chip space, chip removal is not smooth, resulting in overheating, expansion, and other adverse phenomena of parts. Drill the hole with a drill bit of the same size or one larger than the milling cutter, and then mill with the milling cutter. Alternatively, CAM software can be used to produce a screw down tool program.

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