Why are cutting tools deliberately passivated

23 March 2021

Why do you want to do tool passivation treatment? In fact, tool passivation is not the literal meaning of the word, but a way to improve the life of the tool.

Through leveling, polishing, deburring and other procedures to improve tool quality. This is actually a normal process of the tool before coating after finishing grinding.

What is tool passivation?

Improve tool quality and prolong tool life by deburring, leveling and polishing the tool. The name of a process before coating after finishing grinding , the name of tool passivation is not uniform at home and abroad, such as "edge passivation", "edge strengthening", "edge honing", "edge preparation" or "ER (Edge Radiusing) treatment", etc.

Why need to do tool passivation?

After grinding the cutting edge by ordinary grinding wheel or diamond grinding wheel, there are different degrees of micro-notch (i.e. micro-chipped edge and saw kerf). In the cutting process, the micro-notch of the cutting tool is easy to expand and accelerate the wear and damage of the tool.

Modern high speed cutting and automatic machine tools have put forward higher requirements for tool performance and stability. In particular, the coated tool must be passivated before being coated, so as to ensure the fastness and service life of the coating.

The purpose of tool passivation

The purpose of the tool passivation technology is to solve the defects of the micro gap of the tool after the tool is sharpened, so that the edge value can be reduced or eliminated to achieve the purpose of smooth and smooth, sharp and strong and durable.

Main effects of tool passivation

Cutting edge rounding , also known as cutting edge roundness has been recognised as one among the key parameters regarding the micro design and geometry of the cutting edges of a cutting tool in machining metals, etc: to remove burrs and achieve accurate and consistent rounding.

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Cutting edge burr will cause tool wear, and the surface of the processed workpiece will also become rough. After passivation, the cutting edge will become very smooth, greatly reducing the breaking edge, and the surface finish of the workpiece will also improve.

The polishing treatment of the chip breaker groove

The uniform polishing of tool groove can improve surface quality and cutting performance.

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The smoother the groove surface, the better the chip removal, and the higher the cutting speed. At the same time, the surface quality is improved, but also reduce the risk of tool and processing material bite. And can reduce 40% cutting force and make cutting smoother.

Polishing of coatings

Remove the protruding droplets produced by the tool coating, improve the surface finish and increase the absorption of lubricating oil.

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The coated tool surface will produce some small protruding droplets, which improves the surface roughness and makes the tool prone to generate greater friction heat during the cutting process, reducing the cutting speed. After passivation and polishing, the droplets are removed and many holes are left, which can absorb more cutting fluid during machining and greatly reduce the heat generated during cutting, which can greatly improve the cutting speed.

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