Vibration and end-cutting of end mills in CNC turning and milling

Vibration of the end mill

Due to the tiny gap between the CNC turning and milling compound machining of the end mill and the tool holder, the tool may vibrate during the machining process. Vibration will cause uneven cutting of the peripheral edge of the end mill, and the cutting and spreading amount will be larger than the original value, which will affect the machining accuracy and tool life. But when the processed groove width is too small, the tool can also be purposefully vibrated, and the required groove width can be obtained by increasing the cutting and expanding amount. In this case, the maximum amplitude of the end mill should be limited to less than 0.02mm , Otherwise stable cutting cannot be performed. In normal processing, the vibration of the end mill is as small as possible.

When tool vibration occurs in CNC turning-milling complex machining, you should consider reducing the cutting speed and feed rate. If both have been reduced by 40% and there is still greater vibration, you should consider reducing the amount of tooling. If the processing system resonates, it may be caused by factors such as excessive cutting speed, low feed rate, insufficient tool system rigidity, insufficient workpiece clamping force, workpiece shape or workpiece clamping method, etc. At this time, adjustments should be taken to cut Measures such as increasing the rigidity of the tool system and increasing the feed rate.

End-cutting of end mills

In the CNC milling of the cavity of workpieces such as molds that are processed by CNC turning and milling, when the cut point is a concave part or a deep cavity, the extension of the end mill needs to be lengthened. If a long-edged end mill is used, due to the large deflection of the tool, it is easy to produce vibration and cause the tool to break. Therefore, in the machining process, if only the cutting edge near the end of the tool is required to participate in the cutting, it is best to choose a short-edged long-shank end mill with a longer total tool length.

When using a large-diameter end mill on a horizontal CNC machine tool to process a workpiece, the deformation caused by the weight of the tool is relatively large, and more attention should be paid to the problems that are prone to edge cutting. In the case of a long-edged end mill must be used, the cutting speed and feed rate must be greatly reduced.

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