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Why is the tool intentionally passivated? Ten years of teachers do not necessarily understand!

Source: Browse:43 The release date:2021.07.14 [ Large medium small ]

The CNC tool used in machining center is not the faster the better, why passivation treatment? In fact, tool passivation is not a literal meaning, but a way to improve tool life.

The quality of the cutting tool can be improved by leveling, polishing and deburring. This is actually a normal process after finishing and before coating.

 

What is tool passivation?

By deburring, leveling and polishing the cutting tool, the quality and service life of the cutting tool can be improved. At present, the name of a process after finishing grinding and before coating is not unified at home and abroad, such as "edge passivation", "edge strengthening", "edge honing", "edge preparation" or "Er (edge radiation) treatment".

 

Why tool passivation?

There are micro notches (micro chipping and sawing) in the cutting edge after grinding with ordinary grinding wheel or diamond grinding wheel. In the cutting process, the micro notch of the cutting edge is easy to expand, which speeds up the tool wear and damage.

Modern high-speed machining and automatic machine tools put forward higher requirements for tool performance and stability, especially the coated tool must be passivated before coating, so as to ensure the firmness and service life of the coating.

 

Purpose of tool passivation 

The purpose of edge passivation technology is to solve the defect of micro notch of tool edge after grinding, reduce or eliminate the edge value, and achieve the purpose of smooth, sharp and durable.

 

Main effects of tool passivation

Edge rounding: deburring the edge to achieve accurate and consistent rounding.

 

The burr of the edge causes the tool to wear, and the surface of the workpiece will become rough. After passivation, the edge becomes very smooth, which greatly reduces the edge breakage, and the surface finish of the workpiece will be improved.

 

Polishing treatment of the slotting

The surface quality and cutting performance are improved by polishing the groove evenly.

 

 

 

 

The smoother the groove surface is, the better chip removal is, and the higher cutting speed can be achieved. At the same time, with the improvement of surface quality, the risk of tool and material biting is reduced. And can reduce 40% of the cutting force, cutting more smoothly.

 

Polishing of coatings

After removing the tool coating, the protruding droplets can improve the surface finish and increase the adsorption of lubricating oil.

 

 

After coating, the tool surface will produce some tiny protruding droplets, which improves the surface roughness and makes the tool easy to produce greater friction heat in the cutting process, reducing the cutting speed. After passivation and polishing, the droplets are removed and many small holes are left. More cutting fluid can be absorbed during machining, which greatly reduces the heat generated during machining and greatly improves the cutting speed.


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