Must-know for machining - Tool passivation

What is tool passivation

The process of deburring, smoothing and polishing the tool to improve the quality and extend the service life of the tool. The name of the process is not uniform at home and abroad, but it is called "edge dulling", "edge strengthening", "edge honing", "edge preparation", etc, "edge preparation", etc.

Why tool dulling

After sharpening by ordinary grinding wheels or diamond grinding wheels, the cutting edge of the tool has microscopic notches of different degrees (i.e. micro chipping and sawing). In the cutting process, the tool edge micro notch is very easy to expand, speeding up the tool wear and damage.

Modern high-speed cutting and automated machine tools put forward higher requirements on tool performance and stability, especially coated tools must be passivated before coating to ensure the solidity and service life of the coating.

Purpose of tool passivation

The purpose of edge passivation technology is to solve the defects of the microscopic notch of the tool edge after sharpening, so that its sharpness value is reduced or eliminated, to achieve a smooth and smooth, both sharp and durable purpose. The main effects of tool passivation are

Rounding of the cutting edge: Removal of the cutting edge burr and achieving precise and consistent rounding.

After passivation, the cutting edge becomes smooth, which greatly reduces chipping and increases the surface finish of the workpiece.

Uniform polishing of the tool groove improves the surface quality and the row of cutting performance.

The flatter and smoother the groove surface is, the better the chip removal will be, and the higher speed cutting can be achieved. At the same time, the improved surface quality also reduces the risk of the tool biting into the material being machined. It also reduces cutting forces by 40% and results in smoother cutting.

Coating polishing

Removal of protruding droplets produced by the tool coating improves the surface finish and increases the adsorption of lubricant. The surface of the tool after coating will produce some tiny protruding droplets, which improve the surface roughness and make the tool easy to produce larger frictional heat during cutting and reduce the cutting speed. After passivation and polishing, the droplets are removed and many small holes are left, which can absorb more cutting fluid during machining, making the heat generated during cutting greatly reduced and greatly improving the cutting speed.


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