The polishing mirror surface processing technology is mainly used to reduce the surface roughness of the workpiece, when selecting the polishing process method for metal workpieces. Because electrolytic polishing, fluid polishing and other methods are difficult to accurately control the geometric accuracy of parts, and the surface quality of chemical polishing, ultrasonic polishing, magnetic abrasive polishing and other methods cannot meet the requirements, so the mirror processing of precision molds is still based on mechanical polishing. host.
Different methods can be selected according to different needs. The common polishing mirror processing methods include: mechanical polishing, chemical polishing, electrolytic polishing, ultrasonic polishing, fluid polishing, Hawker mirror processing and magnetic grinding and polishing. This time, I will introduce the last four:
1. Ultrasonic polishing
The workpiece is put into the abrasive suspension and placed together in the ultrasonic field, and the abrasive is ground and polished on the surface of the workpiece by means of ultrasonic oscillation. Ultrasonic machining has a small macroscopic force and will not cause deformation of the workpiece, but it is difficult to manufacture and install tooling. Ultrasonic processing can be combined with chemical or electrochemical methods, which is more conducive to surface brightening.
2. Fluid polishing
Fluid polishing relies on the high-speed flowing liquid and the abrasive particles carried to scour the surface of the workpiece to achieve the purpose of polishing. Commonly used methods are: abrasive jet processing, liquid jet processing, hydrodynamic grinding, etc. Hydrodynamic grinding is driven by hydraulic pressure, so that the liquid medium carrying abrasive particles flows back and forth across the surface of the workpiece at high speed. The medium is mainly made of a special compound (polymer-like substance) with good flowability under relatively low pressure and mixed with abrasives. The abrasives can be silicon carbide powder.
3. Hawker can process mirror surface
As a new polishing process, it has unique advantages in processing many kinds of metal parts. It can replace traditional grinding machines, rolling, boring and rolling, honing, polishing machines, abrasive belt machines and other metal surface finishing equipment and processes; it makes it easy to process metal workpieces with a high finish. Hawker can be used to process a variety of stainless steel and other metal workpieces, with many additional benefits. For example, the surface finish of the processed workpiece can be improved to above grade 3; the surface wear resistance and corrosion resistance of the workpiece are greatly improved: the surface microhardness of the workpiece is increased by more than 20%.
4. Magnetic grinding and polishing
Magnetic grinding and polishing is to use magnetic abrasives to form abrasive brushes under the action of a magnetic field to grind the workpiece. This method has the advantages of high processing efficiency, good quality, easy control of processing conditions, and good working conditions.
