Why do machining center tools need passivation?

In fact, tool passivation is not the literal meaning, but the way to improve tool life. Improve the quality of cutting tools by flattening, polishing, deburring and other processes. This is actually a normal process after the tool is finely ground and before the coating. Many friends have such a question, the CNC tool used in the machining center is not the faster the better, why passivation? In fact, tool passivation is not the literal meaning, but the way to improve the service life of the tool. Improve the quality of cutting tools by flattening, polishing, deburring and other processes. This is actually a normal process after the tool is finely ground and before the coating.

The tool will be grinded by the grinding wheel before the finished product, but the grinding process will cause different degrees of micro notches. The micro notch of machining center is easy to expand while high-speed cutting, which speeds up the wear and damage of tools. In modern cutting technology, there are strict requirements for the stability and precision of cutting tools. Therefore, NC cutting tools 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 tool physical wear

In the cutting process, the tool surface will be gradually consumed by the workpiece, and the cutting edge is prone to plastic deformation under high temperature and pressure. The passivation treatment of the tool can help to improve the rigidity of the tool and avoid the tool losing cutting performance too early.

2. Maintain the finish of the workpiece

Burr on the cutting edge of the tool will cause the tool to wear, and the surface of the workpiece will become rough. After passivation treatment, the cutting edge of the tool will become very smooth, the phenomenon of edge collapse will be correspondingly reduced, and the surface finish of the workpiece will also be improved.

3. Convenient groove for chip removal

The surface quality and chip removal performance can be improved by polishing the tool groove. The smoother the groove surface is, the better chip removal will be, and more coherent cutting can be realized.

After passivation and polishing, many holes will be left on the surface of CNC tool in machining center. These holes can absorb more cutting fluid during machining, which greatly reduces the heat generated during cutting and greatly improves the cutting speed.