Passivation Of CNC Tool: What Is It, How Does It Work

What is tool passivation, how does passivation work and what is the purpose of tool passivation? CNC machining service manufacturers and part material makers frequently ask these kinds of questions. In this guide, we tell the answers.

What Is Tool Passivation - What Does It Mean

Tool passivation technology, also known as Er (edgeradius) treatment, aims to improve tool life and reduce production costs. After passivation treatment, the micro notch of the tool after regrinding can be reduced and the tool edge becomes flat. A reasonable blunt radius of the edge can eliminate the residual stress of the tool after regrinding, remove the surface cracks that cause fatigue of the tool edge, and make the surface of the tool smooth, free of cracks and grinding burrs. After passivation treatment, the tensile strength and edge toughness of the tool are improved, which can increase the strength of the blade, improve the durability of the tool, reduce or avoid the unstable and rapid wear of the tool caused by the edge defect at the initial stage of cutting, and improve the stability of the machining dimension. With the improvement of the smoothness of the edge, it can prevent the formation of chip buildup.

Tool passivation is simply the passivation treatment of the cutting edge of the tool, which is actually the pre wear of the tool. After the tool is grinded with ordinary grinding wheel or diamond grinding wheel, there will be a certain degree of micro chipping and sawtooth of different sizes. The former can be observed with the naked eye or hand-held magnifying glass, and the latter can be observed with a 100 times magnifying glass. The micro notch of the edge is generally 0.01~0.05mm. These defects are easy to expand with the prolongation of the service time of the tool, so as to accelerate the wear and damage of the tool and affect the cutting performance. However, after the passivation treatment of the cutting edge, there will be a fine arc cutting edge at the cutting edge, and the cutting edge belt will also become smooth. This eliminates defects such as gouges, serrations, and cracks.

Purpose & Requirements Of Tool Passivation

The purpose of tool passivation in machining center is to solve the defect of micro notch of tool edge after grinding, reduce or eliminate its sharp value, and achieve the purpose of smoothness, sharpness, firmness and durability.

Requirements for tool passivation is to remove the burr of the knife edge to achieve accurate and consistent rounding processing; The burr of the cutting edge will lead to tool wear, and the surface of the processed workpiece will become rough. After passivation, the cutting edge will become smooth, which greatly reduces edge collapse and improves the surface finish of the workpiece; The tool grooves are polished evenly to improve the surface quality and cutting performance. The smoother the groove surface is, the better the chip removal will be, and a higher cutting speed can be achieved.

In addition, the coating treatment of the tool will leave many small holes, which can absorb more cutting fluid during machining, greatly reduce the heat generated during cutting, and greatly improve the cutting speed. Therefore, the advantage of tool passivation is that the operator of machining center needs to understand and necessary machining skills.

Passivation Of CNC Tool: What Is It, How Does It Work

What Is Tool Passivation - What Does It Mean

Purpose & Requirements Of Tool Passivation

Related Articles：