Carbide blade edge passivation technology can effectively improve tool life

The cutting edge passivation technology of cemented carbide blades is a problem that has not been universally recognized, but is also very important. Passivated inserts increase blade edge strength, service life and stability during the cutting process.

The edge of the blade after sharpening by ordinary grinding wheel or diamond grinding wheel has different microscopic gaps, and the micro-notch is easily expanded during the cutting process, which accelerates the wear and damage of the blade. Coated cemented carbide inserts must be passivated by the blade edge before coating to ensure the firmness and service life of the coating.

The cutting edge geometry of the carbide insert has a great influence on the life of the insert. There are mainly two types of cutting edge passivation shapes: one is a circular arc edge, forming a symmetrical arc at the corner of the cutting edge, 80 More than % of the blade passivation treatment is used for rough finishing; the other is a waterfall type edge, which forms an asymmetrical arc with a ratio of 2:1 at the top and side of the edge of the cutting edge. Impact processing.

The method of cutting the edge of cemented carbide inserts is also constantly evolving. The first use of manual passivation, and then mechanical passivation improves the passivation efficiency and quality. With the development of technology, there is a dedicated CNC edge passivation machine. appear.

Carbide insert passivation technology is one of the effective measures to improve the service life of the blade. It is feasible and effective in both economic and technical aspects, and further promotes the improvement of the machining level of cemented carbide inserts.