There are many reasons for machining errors in the cutting process of CNC milling machines. The error caused by the radial pulse of the tool is an important factor. It directly affects the small shape error and geometric shape accuracy of the machined surface under ideal conditions. In the actual cutting process, the radial runout of the tool affects the machining accuracy, surface roughness, uneven wear of the tool, and the cutting process characteristics of multi tooth tools. The larger the radial pulse of the tool, the more unstable the machining state of the tool, and the greater the impact on the machining effect.

When there is radial runout of the milling machine tool, we should immediately perform the following checks:

1. Check if there are impurities in the elastic chuck and taper transition sleeve;

2. Whether the tool itself is bent;

3. Is the spindle itself jumping.

After inspection, we need to minimize radial runout as much as possible. So, what are the methods to reduce radial runout?

The radial runout of the cutting tool is mainly due to the increase of radial cutting force, which increases the radial runout. Therefore, reducing radial cutting force is an important principle for reducing radial runout. The following methods can be used to reduce radial runout:

1. Using a sharp knife

Choose a larger front angle for the cutting tool to make it sharper, reduce cutting force and vibration. In order to reduce the friction between the elastic recovery layer on the surface of the main blade and the transition surface of the workpiece, a tool with a large back angle is selected to reduce vibration. However, the front and rear corners of the tool cannot be selected too large, otherwise it will lead to insufficient strength and cooling area of the tool. Therefore, different tool rake and rake angles should be selected according to the specific situation, and smaller rough machining can be adopted. However, in precision machining, in order to reduce the radial runout of the tool, it should be larger to make the tool sharper.

2. Using powerful tools

There are two main methods to improve tool strength. One is to increase the diameter of the tool holder by 20% under the same radial cutting force, and the radial runout of the tool holder can be reduced by 50%. The second is to shorten the extension length of the tool. The longer the tool length, the greater the deformation of the tool during the CNC milling process, and the greater the variation in processing time. The radial pulse of the tool will constantly change, leading to deformation of the workpiece. The surface is not smooth. The length of the cutting tool has been reduced by 20%, and the radial runout ability has also been reduced by 50%.