Abrasive abrasives are called industrial teeth. When grinding, abrasive tools are often used as grinding tools to process parts to meet some industrial requirements. There are six ways to grind. Here is a brief introduction for you:
1, mechanical polishing
Mechanical polishing is a polishing method to remove the polished convex part by cutting the plastic deformation of the material surface to obtain a smooth surface. Generally, there are wool wheels, sandpaper, abrasive belt and nylon wheels. They are all used, mainly by hand. Special parts can use auxiliary tools such as turntable, and ultra-precision grinding and polishing can be used for those with high surface quality requirements.
Ultra-precision grinding and polishing is a special abrasive tool made of abrasive. In the polishing solution containing abrasive, it is the highest among all kinds of polishing methods to press on the machined surface of the workpiece and rotate at high speed.
2. Chemical polishing
Chemical polishing is to make the micro-convex part of the material surface dissolve before the concave part in the chemical medium, so as to obtain a smooth surface. The main advantages of this method are that it does not need complicated equipment, can polish workpieces with complicated shapes, can polish multiple workpieces at the same time, and has high efficiency. The core problem of chemical polishing is the preparation of polishing solution.
3, electrolytic polishing
The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, by selectively dissolving the tiny protrusions on the surface of the material, the surface is smooth. Compared with chemical polishing, it can eliminate the influence of cathode reaction and has better effect. Electrochemical polishing process is divided into macro leveling and micro leveling.
4. Ultrasonic polishing
Ultrasonic polishing is to put the workpiece into abrasive suspension and put them together in an ultrasonic field. Through the oscillation of ultrasonic waves, the abrasive is polished on the surface of the workpiece. Ultrasonic machining has small macroscopic force and will not cause workpiece deformation, but it is difficult to make and install the tooling.
Ultrasonic polishing method can be combined with chemical polishing and electrolytic polishing. On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to stir the solution, so that the dissolved products on the surface of the workpiece are separated and the corrosion or electrolyte near the surface is uniform. The cavitation of ultrasonic wave in liquid can also inhibit the corrosion process, which is beneficial to surface whitening.
5, fluid polishing
Depending on the high-speed flowing liquid and the abrasive particles it carries, the surface of the workpiece is washed to achieve the purpose of polishing. Commonly used methods include abrasive emery jet machining, liquid jet machining, hydrodynamic grinding and so on. Hydrodynamic grinding is driven by hydraulic pressure, which makes the liquid medium carrying abrasive particles flow over the surface of the workpiece at high speed. The medium is mainly made of special compounds flowing under low pressure and doped with abrasives, which can be silicon carbide powder.
6. Magnetic grinding and polishing
Magnetic abrasive polishing is to use magnetic abrasive to form grinding brush under the action of 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.
Second, what method is good for grinding tool polishing?
Strictly speaking, grinding and polishing with abrasives should be called mirror processing, which not only requires high polishing itself, but also has high standards for surface flatness, smoothness and geometric accuracy. However, surface polishing usually only needs to obtain a bright surface.
Among several polishing methods, the appropriate one is mainly selected according to the polishing requirements and abrasives. Generally, the mirror surface processing of precision abrasive tools is mainly mechanical polishing, and chemical polishing or electrolytic polishing can be appropriately used for ordinary abrasive tools.