Electrolytic polishing of precision stamping dies, that is, by selectively dissolving tiny protruding portions on the surface of the material to make the surface smooth. Compared with chemical polishing, the effect of the cathode reaction can be eliminated, and the effect is better.
The electrochemical polishing process is divided into two steps:
(1) Macroscopic leveling, the dissolved product diffuses into the electrolyte, and the surface roughness of the material decreases by Ra>1 μm.
(2) The low light level is flat, the anodic polarization, and the surface brightness is increased by Ra<1 μm.
3. Ultrasonic polishing
The precision stamping die workpiece is placed in the abrasive suspension and placed in the ultrasonic field together, and the abrasive is ground and polished on the surface of the workpiece by the vibration of the ultrasonic wave. Ultrasonic machining has a small macroscopic force and does not cause deformation of the workpiece, but it is difficult to manufacture and install the tooling.
Ultrasonic processing can be combined with chemical or electrochemical methods. On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to stir the solution to dissociate the dissolved products on the surface of the workpiece, and the corrosion or electrolyte near the surface is uniform. The cavitation of the ultrasonic wave in the liquid can also inhibit the corrosion process and facilitate surface illuminating.