What are the commonly used polishing methods for car panel surface treatment

When dealing with the surface of the carriage board, there are many commonly used polishing methods, among which the common ones are:

1.Mechanical polishing:Mechanical polishing is a polishing method in which a polished convex portion is removed by cutting and plastic deformation of a material surface. Generally, it is oilstone, wool wheel, sandpaper, etc. They are all used, mainly by manual operation. For special parts, such as the surface of a rotating body, auxiliary tools such as a rotating table can be used. If the surface quality requirements are high, the method of ultra-fine polishing can be used. Ultra-precision grinding and polishing is a special grinding tool, which is pressed against the processing surface of the workpiece in the grinding and polishing liquid containing abrasives and rotates at high speed. The technology can be used to obtain0.008mThe surface roughness is higher in various polishing methods. This method is commonly used for optical lens molds.

2.Chemical polishing:Chemical polishing is to dissolve the microscopic convex part of the material surface in the chemical medium before the concave part, so as to obtain a smooth surface. The main advantage of this method is that it does not require complicated equipment, can polish workpieces with complex 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. The surface roughness obtained by chemical polishing is generally10m.

3.Electrolytic polishing:The basic principle of electrolytic polishing is the same as chemical polishing, that is, by selectively dissolving the tiny protrusions on the surface of the material to make the surface smooth. Compared with chemical polishing, the effect of cathode reaction can be eliminated and the effect is better. The electrochemical polishing process is divided into two steps:(1)The product of the macroscopic leveling solution diffuses into the electrolyte, and the geometric roughness of the material surface decreases,RaGreater1 m(2)Micro sightseeing leveling anode polarization, surface brightness increased,RaLess1 m

4.Ultrasonic polishing:Put the workpiece into the abrasive suspension, put it together in the ultrasonic field, and grind and polish the abrasive on the surface of the workpiece by ultrasonic oscillation. Ultrasonic processing macro force is small, will not cause the workpiece, deformation, but processing and tooling installation difficulties. Ultrasonic machining 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 separate the dissolved products on the surface of the workpiece, and the corrosion or electrolyte near the surface is uniform; ultrasonic cavitation in the liquid can also control the corrosion process, which is conducive to surface brightening.

5.Fluid polishing:The purpose of fluid polishing is to clean the surface of the workpiece according to the high-speed flowing liquid and the abrasive particles it carries. The commonly used methods are abrasive jet processing, liquid jet processing, fluid power grinding and so on. Hydraulic grinding is driven by hydraulic pressure, so that the liquid medium carrying the abrasive particles flows back and forth at high speed on the surface of the workpiece. The medium is mainly mixed with a special compound with good fluidity under low pressure and an abrasive. The abrasive can be silicon carbide powder.

6.magnetic abrasive polishing:Magnetic grinding and polishing is the use of magnetic abrasives in the magnetic field to form a grinding brush to grind the workpiece. This method has high processing efficiency, good quality, easy control of processing conditions, and good working conditions. Using suitable abrasives, the surface roughness can reachra0.1m.