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Why Is The Machine Tool Passivated

Nov 20, 2019

As the saying goes, "There must be a good tool for the good work of the workers." This principle has been well extended and spread since ancient times. However, in the machine tool industry, the tool does not seem to be "faster", the better, many in the first contact. When it comes to machine tools, there is a question "Why is a good tool to be passivated?" Let ALLES CNC bring you to learn about the "tool passivation" today.

 Machine tool(alle cnc)

In fact, tool passivation is not a literal understanding of the word, but a means to effectively improve the tool life. Improve the quality of the tool by smoothing, polishing, deburring and other processes. This is actually a normal process before the coating is finished after the grinding. In general, the way of tool passivation polishing is divided into brush, sandblasting, and drag-type polishing machine, which are widely used in brush and drag type applications.


Anyone involved in the metal cutting industry knows that the tool will be sharpened by a grinding wheel before the finished product, but the sharpening process will cause different degrees of micro-notch. This results in a high-speed cutting of the CNC machine while the micro-notch can be easily expanded, thus accelerating tool wear and damage. In modern cutting technology, the stability and precision of the tool are strictly required. Therefore, the CNC tool must pass the passivation treatment before the coating to ensure the firmness and service life of the coating.


Advantages and objectives of tool passivation


1. Resistance to physical wear of the tool


During the cutting process, the surface of the tool will be gradually worn out by the workpiece. During the cutting process, the cutting edge is prone to plastic deformation under high temperature and high pressure. The passivation of the tool helps the tool to increase rigidity and avoid premature loss of cutting performance.


2. Maintain the smoothness of the workpiece


A burr on the edge of the tool can cause the tool to wear and the surface of the machined workpiece can become rough. After passivation, the cutting edge of the tool becomes very smooth, the chipping phenomenon is reduced accordingly, and the surface finish of the workpiece is also improved.


3. Convenient groove chip removal


Polishing the tool groove improves surface quality and chip removal performance. The flatter and smoother the groove surface, the better the chip removal, enabling more consistent cutting.


After the passivation and polishing of the tool of CNC machine tool, many small holes will be left on the surface. These holes can absorb more cutting fluid during processing, which greatly reduces the heat generated during cutting and greatly increases the speed of cutting

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