CNC tool requirements for machining centers

The CNC tools used in machining centers are different from ordinary tools and require:
1. Good rigidity (especially roughing tools), high precision, and small vibration resistance and thermal deformation.
2. Good interchangeability, easy to change tools quickly.
3. Long service life, stable and reliable cutting performance.
4. The size of the tool is easy to adjust to reduce tool change and adjustment time.
5. The tool should be able to break or roll chips reliably to facilitate the removal of chips.
6. Serialization and standardization are conducive to programming and tool management.
The selection of cutting tools for machining centers is very important. Tools should be selected correctly based on the processing capabilities of the machine tool, the performance of the workpiece material, the processing procedures, the cutting volume and other related factors. The general principle of selection is:
1. Easy installation and adjustment, good rigidity, high durability and precision.
2. On the premise of meeting the processing requirements, try to choose a shorter tool holder to improve the rigidity of the tool processing.
3. When selecting a tool, make sure that the size of the tool matches the surface size of the workpiece being processed. For example: when processing the peripheral contour of flat parts, end mills are often used; when milling flat surfaces, carbide blade milling cutters should be selected; when processing bosses and grooves, high-speed steel end mills should be selected; when processing blank surfaces or rough machining holes When processing, you can choose a corn milling cutter with a carbide blade; for processing some three-dimensional surfaces and variable bevel contours, ball end milling cutters, ring milling cutters, tapered milling cutters and disc milling cutters are often used.
In addition, on the machining center, various tools are installed in the tool magazine respectively, and tool selection and tool change actions are performed at any time according to the program. Therefore, it is necessary to arrange the order of the tools reasonably. Generally, the following principles are followed: minimize the number of tools; After the tool is clamped, all machining parts that it can perform should be completed; tools for roughing and finishing should be used separately, even if they are tools of the same size; milling first and then drilling; surface finishing first, and then two-dimensional contour finishing. Processing; where possible, the automatic tool changing function of CNC machine tools should be utilized as much as possible to improve production efficiency.