Many friends have such questions. The faster the CNC tools used in the machining center, the better, so why passivation? In fact, tool passivation is not what everyone understands literally, but a way to improve tool life. Improve the quality of cutting tools through processes such as leveling, polishing, and deburring. This is actually a normal process after the tool is finely ground and before the coating.
Tool passivation comparison
The tool will be sharpened by a grinding wheel before the finished product, but the sharpening process will cause different degrees of microscopic gaps. When the machining center performs high-speed laser cutting, the micro-notch will easily expand, which will accelerate the wear and damage of the tool. Modern cutting technology has strict requirements on the stability and precision of the cutting tool. Therefore, the CNC cutting tool must be passivated before coating to ensure the firmness and service life of the coating.
What are the benefits of tool passivation?
1. Resistance to physical wear of the tool
During the cutting process, the tool surface will be gradually worn by the workpiece, and the cutting edge is also prone to plastic deformation under high temperature and high pressure during the cutting process. The passivation treatment of the tool can help the tool increase its rigidity and prevent the tool from losing its cutting performance prematurely.
2. Maintain the finish of the workpiece
Burrs on the cutting edge of the tool will cause the tool to wear and the surface of the machined workpiece will become rough. After passivation treatment, the cutting edge of the tool will become very smooth, chipping phenomenon will be correspondingly reduced, and the surface finish of the workpiece will be improved.
3. Convenient for groove chip removal
Polishing the tool groove can improve the surface quality and chip removal performance. The smoother the surface of the groove, the better the chip removal, and more consistent cutting can be achieved.
After the CNC tool of the machining center is passivated and polished, many small holes will be left on the surface. These small holes can absorb more cutting fluid during machining, which greatly reduces the heat generated during cutting, which greatly improves the cutting process speed.