Issues that need attention in the selection of tools for CNC milling

At present, most of the CNC machine tools use serialized and standardized tools. There are national standards and serialized models for tool holders and tool heads such as indexable machine-clamped external turning tools and face turning tools. For machining centers and automatic tool changers Installed machine tool. In CNC machining, flat-bottomed end mills are commonly used for milling the inner and outer contours of plane parts and the milling plane. The empirical data of the relevant parameters of the tool is as follows:

First, the radius of the milling cutter RD should be smaller than the minimum radius of curvature Rmin of the inner contour surface of the part, generally RDu003d(0.8一0.9)Rmin.

The second is the machining height of the part H<(1/4-1/6)RD to ensure that the knife has sufficient rigidity.

The third is when using a flat-bottomed end mill to mill the bottom of the inner groove, because the groove bottom needs to be overlapped for two passes, and the radius of the bottom edge of the tool is Reu003dRr, that is, the diameter is du003d2Reu003d2(Rr) When programming, take the tool radius as Reu003d0.95(Rr). (Guide: How to extend the process life of cold heading molds)

For the processing of some three-dimensional profiles and contours with variable bevel angles, spherical milling cutters, ring milling cutters, drum milling cutters, tapered milling cutters and disc milling cutters are commonly used.

The tool holders of the tools have been serialized and standardized. For example, the standard code of the tapered tool system is TSG-JT, and the standard code of the straight tool system is DSG-JZ. In addition, for the selected tool, Before use, the tool size needs to be strictly measured to obtain accurate data, and the operator enters these data into the data system, and completes the processing process through program call, thereby processing qualified workpieces.

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