Do you really understand tool passivation?

14 October 2022
What is tool passivation? 
By deburring, leveling, and polishing the tool, the quality of the tool and the service life are improved. After the tool is finely ground, the name of a process before the coating is not uniform at home and abroad. It is called "edge passivation", "edge strengthening", "edge honing", "edge preparation" and so on.
Tool passivation before and after
Comparison before and after tool passivation
Why Tool Passivation?
The cutting edge of the tool after being sharpened by an ordinary grinding wheel or a diamond grinding wheel has different degrees of microscopic gaps (ie, microchipping and sawing). During the cutting process, the tiny notch of the tool edge is easy to expand, which accelerates the tool wear and damage.
Modern high-speed cutting and automated machine tools put forward higher requirements for tool performance and stability. Coated devices must be passivated before coating to ensure the firmness and service life of the coating.


Purpose of tool passivation
The purpose of edge passivation technology is to solve the defects of the microscopic gap of the knife edge after sharpening, reduce or eliminate the edge value, and achieve the purpose of being smooth and smooth, which is sharp, strong, and durable. The main effects of tool passivation are:
▶Edge rounding: remove edge burrs and achieve precise and consistent rounding.
▶Edge burrs lead to tool wear, and the surface of the workpiece will become rough. After passivation treatment, the cutting edge becomes very smooth, which greatly reduces chipping and improves the surface finish of the workpiece.
▶Uniform polishing of tool grooves to improve the surface quality and cutting performance.
The smoother the groove surface, the better the chip evacuation and the higher the cutting speed. At the same time, after the surface quality is improved, the risk of the cutting tool and the processing material being bitten is also reduced. And can reduce by 40% cutting force, cutting more smoothly.
Before and after workpiece processing
Comparison of workpieces before and after processing
Polishing of the coating
Removal of protruding droplets from tool coating to improve surface finish and increase lubricating oil adsorption. The surface of the coated tool will produce some tiny protruding droplets, which improves the surface roughness, making the tool easy to generate large frictional heat during the cutting process and reducing the cutting speed.
After passivation and polishing, the droplets are removed, leaving many small holes, which can absorb more cutting fluid during machining, greatly reduce the heat generated during cutting, and greatly improve the cutting speed.


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