The value of cutter coating passivation:
Passivation of tools is a pre-treatment process for cutter tool coating. By removing burrs, smoothing and polishing the tool, the quality and service life of the tool can be significantly improved.
- Significantly improve the firmness and service life of the coating.
After grinding the tool edge with a grinding wheel, there are varying degrees of microscopic notches (i.e. small breaking edges and sawtooths). During cutting, the microscopic notches on the tool edge are prone to expansion, accelerating the wear and damage of the tool. Tool passivation treatment can effectively remove the burrs and defects of the edge, enhance the coating bonding strength at the R angle, and thus improve the service life of the tool. - Improve the processing speed of the tool and the number of processed workpieces by polishing the grooves.
The pre-treatment of the coating can achieve uniform polishing of the tool grooves, reduce its surface friction coefficient, effectively improve the chip adhesion, and inhibit the formation of chip lumps. At the same time, it also reduces the risk of the tool biting the workpiece, reduces the cutting force by 40%, and makes the cutting smoother. - Form nano-level concaves to improve the processing speed and service life of the tool.
After coating, the tool surface will produce some small protruding “liquid droplets”, which increase the surface roughness. After post-passivation polishing treatment, the small droplets are removed, and many small holes are left, which can adsorb cutting fluid during cutting, improve the lubrication and heat dissipation of the tool, and thus improve its processing speed and durability. - Reduce the stress of the coating layer and improve the sliding property and coating bonding strength of the tool surface.
Traditional sandblasting can cause hard coatings such as DLC and chrome plating to peel off. The passivation polishing process can effectively adjust the coating stress and improve the coating quality.
Airflow tool passivation technology:
- Introduction to technical features:
The nanoparticle airflow passivation technology can develop different processing techniques according to different material hardness, processing contours, mirror requirements, and other differentiated needs. - Airflow grinding and polishing method:
The principle of airflow polishing technology is to use high-density soft synthetic materials to make soft polishing media (soft abrasives), which are accelerated by airflow. The horizontal elongation of the soft abrasive under force makes it easier to obtain sliding friction in the Vx direction, and deformation occurs to obtain friction superposition, and the polishing distance s is obtained. The elastic properties of the soft substrate, as shown in the figure below, can obtain extremely small polishing pressure P, and the contact pressure distribution is uniform, making it possible to remove extremely small amounts of plastic deformation Dp, and adjust the incident angle and speed to achieve a mirror effect without any external lubrication.
The sliding and scratching of the grinding particles and the characteristics obtained with extremely small polishing pressure are fundamentally different from the traditional dry and wet sandblasting methods.
Application of tool coating passivation:
Polishing of various metal, ceramic, graphite molds, punches, guide posts, slide rails, and complex parts. Removal of burrs on the edge of the tool, strengthening of the edge, and improvement of the service life. Removal of tool coating droplets, elimination of stress, and reduction of friction and wear. Removal of grinding defects or oxide layers, and improvement of the adhesion of various tool coatings. Other parts or products with functional or appearance requirements that require polishing. Medical and pharmaceuticals.
Extrusion taps:
remove burrs on the tooth top before coating to enhance the adhesion of tool coating.
