Isn’t the faster the better for tools used in CNC machining centers? Why is passivation necessary? Actually, passivation is not a literal understanding of the word here, it refers the way to increase the life of the cutter. Improving the quality of the cutter by flattening, polishing, and deburring is actually a normal process after the cutter has been finish ground and before it is coated.
Purposes of cutter passivation
The existence of microscopic chipping to varying degrees on the cutter edge after sharpening with an ordinary grinding wheel or a diamond grinding wheel. (i.e. micro chipping and sawing) During the cutting process, microscopic gaps in the cutter edge are highly susceptible to expansion, which can accelerate cutter wear and damage.
Modern high-speed cutting and machining and automated machine tools put forward higher requirements for cutter performance and stability, especially coated tools must be passivated before coating to ensure the firmness and service life of the coating.
The purpose of edge passivation technology is to solve the defects of microscopic gaps in the edge of the cutter after sharpening, so that the appearance of the cutter is rounded and smooth, and to achieve the purpose of sharpness, strength and durability.
Merits of cutter passivation
1. Remove edge burrs for precise consistency. Edge burrs cause cutter wear and a rough surface on the machined workpiece. After passivation, the edge becomes smooth, which greatly reduces chipping and improves the surface finish of the workpiece.
2. Uniform polishing of cutter recesses improves surface quality and chip removal performance. The more flat and smooth the groove surface is, the better the chip evacuation will be, and the higher the cutting speed can be realized. At the same time, the improved surface quality reduces the risk of the cutter biting the machined material. It also reduces the cutting force by 40% for smoother cutting.
3. Removes protrusions created by cutter coating, improves surface finish, and increases lubricant adsorption. The surface of the coated cutter produces some tiny protrusions, which increase the surface roughness and cause the cutter to generate more frictional heat during the cutting process to reduce the cutting speed. After passivation and polishing, minor protrusions are removed while leaving many small holes, which can adsorb more cutting fluid during machining, resulting in a significant reduction of heat generated during cutting, which can greatly improve the speed of cutting and machining.
Summary
For different machining needs and purposes, You can choose to cooperate with us without any hesitation.
CYCO, a CNC machining expert with over twenty years of experience, has the most advanced technology and the most professional staff in the industry.
Choose CYCO for a worry-free experience now!
