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CNC Machining Aluminium Alloy Parts The Operating Skills
Mar 22, 2018

CNC machining aluminum alloy parts in the process of deformation, the operation method is also very important.

1. For parts with large machining allowances, in order to make them have better heat dissipation conditions during the processing and avoid heat concentration, symmetrical processing should be adopted. If there is a 90mm thick sheet that needs to be machined to 60mm, if the other side is milled immediately after milling one side, once to the final dimension, the flatness will reach 5mm; if repetitive infeed symmetrical processing is used, each side will be processed twice The final size ensures a flatness of up to 0.3mm.

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2. If there are multiple cavities in the sheet metal parts, it is not appropriate to use a cavities or cavities in order to process them. This can easily cause deformation of the parts due to uneven force. With multiple layers of processing, each layer is processed to all the cavities as much as possible, and then the next layer is processed to make the parts evenly stressed and reduce the deformation.


3. Reduce the cutting force and cutting heat by changing the cutting amount. In the three elements of the cutting amount, the amount of back blade 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 part, but also affect the rigidity of the spindle of the machine tool and reduce the durability of the tool. If you reduce the amount of back knife, it will greatly reduce the production efficiency. However, high-speed milling in CNC machining can overcome this problem. While reducing the amount of back knife, as long as the feed is increased accordingly and the rotational speed of the machine tool is increased, the cutting force can be reduced and the machining efficiency can be ensured.


4. take the knife order must pay attention to. Roughing emphasizes the improvement of machining efficiency and the pursuit of the removal rate per unit of time. Generally, up-milling can be used. In other words, the superfluous material on the surface of the blank is removed at the fastest speed and in the shortest time to form the geometric outline required for finishing. The emphasis on precision machining is high precision and high quality. Climbing milling is preferred. Because the cutting thickness of the cutting teeth decreases from maximum to zero at the time of crush milling, the degree of work hardening is greatly reduced, and the degree of deformation of the parts is reduced at the same time.


5. thin-walled workpieces in the process of deformation due to clamping, even if it is difficult to avoid the finishing process. In order to reduce the deformation of the workpiece to a minimum, it is possible to loosen the pressing member before the finishing process reaches the final size, so that the workpiece can be freely restored to the original state, and then slightly pressed to just clamp the workpiece (completely With your own hand), you can achieve the desired processing results. In short, the point of action of the clamping force is best on the bearing surface. The clamping force should act in the direction of good rigidity of the workpiece. Under the premise of ensuring that the workpiece is not loose, the clamping force should be as small as possible.


6. When processing pocket-type parts, do not try to drill the cutter into the part as if it were a bit as it is drilled. This will lead to insufficient space for the cutter chip and swarf removal, resulting in overheating, expansion, and collapse of parts. Knife, broken knife and other unfavorable phenomena. It is necessary to drill the hole first with a drill bit of the same size or size as the milling cutter, and then use a milling cutter to mill. Alternatively, the spiral cutter program can be produced using CAM software.