What is tool passivation? The answer given in the book is: Deburring, smoothing, and polishing the tool to improve tool quality and extend service life. Here Xiaobian wants to share with you the benefits of reasonable tool passivation.
After the fine grinding of the tool, the name of the previous process before coating is not uniform at home and abroad. It is called “edge passivationâ€, “edge edge strengtheningâ€, “edge cutting†or “edge preparationâ€.
Why do tool passivation?
There are micro-notches of different degrees (ie, micro-cracking and kerf) due to the cutting edge of the tool after sharp grinding by a normal grinding wheel or a diamond grinding wheel. The micro-notch of the cutting edge of the tool is easily expanded during the cutting process, which accelerates tool wear and damage.
Modern high-speed machining and automated machine tools place higher demands on tool performance and stability. In particular, coated tools must pass through the passivation before the coating to ensure the firmness and service life of the coating.
Purpose of tool passivation
The edge passivation technology is designed to solve the defect of the micro-notch of the cutting edge of the tool after the sharpening, so that the front value is reduced or eliminated, and the smoothness and rigidity are achieved.
Reasonable benefits of tool passivation
Rounding of the cutting edge: removing the edge burrs and achieving precise and consistent rounding.
The edge burr causes the tool to wear, and the surface of the machined workpiece becomes rough. After passivation, the cutting edge becomes smooth, the chipping is greatly reduced, and the surface finish of the workpiece is also improved.
Polishing of the cutting groove
Uniform polishing of the tool groove improves surface quality and performance.
The flatter and smoother the groove surface, the better the chip removal, enabling higher speed cutting. At the same time, the surface quality is improved, which also reduces the risk of the tool and the processing material being killed. It can reduce cutting force by 40% and make the cutting smoother.
The protruding droplets generated after the coating of the tool are removed to improve the surface finish and increase the adsorption of the lubricating oil. The surface of the coated tool will produce some tiny protruding droplets, which will improve the surface roughness, making the tool easy to generate large friction 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 processing, which greatly reduces the heat generated during cutting, which can greatly improve the cutting speed.
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Label: Benefits of reasonable tool passivation
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