What harm does polishing do to the body?

As science and technology developed, industrial technology also developed. Take cars for example. In recent years, the production and sales of cars have been rising steadily. I believe that in a few years, everyone will own a car. As more cars are produced, more workers are needed to polish cars. In addition, there are many other industries that need polishing workers. Some people say that polishing is harmful to the human body. What are the specific hazards?

If you do this kind of work, you will inhale a certain amount of metal dust. If you inhale this substance for a long time, it will have a certain impact on your reproductive system. I hope you will pay special attention to using professional masks.

1. Mechanical polishing

Mechanical polishing is a polishing method that relies on cutting and plastic deformation of the material surface to remove the convex parts after polishing to obtain a smooth surface. Generally, oil stone strips, wool wheels, sandpaper, etc. are used, and manual operation is the main method. For special parts such as the surface of rotating bodies, auxiliary tools such as turntables can be used. For parts with high surface quality requirements, ultra-fine grinding and polishing methods can be used. Ultra-fine polishing uses a special grinding tool, which is pressed tightly against the surface of the workpiece being processed in a polishing liquid containing abrasives and rotated at high speed. This technology can achieve a surface roughness of Ra0.008μm, which is the highest among various polishing methods. This method is often used for optical lens molds.

2. Chemical polishing

Chemical polishing is to make the microscopic protruding parts of the material surface dissolve preferentially over the concave parts in a chemical medium, thereby obtaining a smooth surface. The main advantages of this method are that it does not require complex equipment, can polish workpieces with complex shapes, can polish many workpieces at the same time, and is highly efficient. The core issue of chemical polishing is the preparation of polishing liquid. The surface roughness obtained by chemical polishing is generally several 10μm.

3. Electrolytic polishing

The basic principle of electrolytic polishing is the same as that of chemical polishing, which is to selectively dissolve the tiny protrusions on the surface of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of cathode reaction and has better effect. The electrochemical polishing process is divided into two steps:

(1) Macroscopic leveling: The dissolved products diffuse into the electrolyte, and the geometric roughness of the material surface decreases, Ra>1μm. (2) The surface is smooth and polarized by anode, and the surface brightness is improved, Ra<1μm.

4. Ultrasonic polishing

The workpiece is placed in an abrasive suspension and placed in an ultrasonic field. The abrasive is ground and polished on the workpiece surface by the oscillation of the ultrasonic wave. Ultrasonic machining has a small macroscopic force and will not cause deformation of the workpiece, but the tooling is difficult to manufacture and install. 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 workpiece surface and make the corrosion or electrolyte near the surface uniform; the cavitation effect of ultrasonic waves in the liquid can also inhibit the corrosion process and facilitate surface brightening.

5. Fluid polishing

Fluid polishing is a process of polishing by flushing the workpiece surface with high-speed flowing liquid and the abrasive particles it carries. Commonly used methods include: abrasive jet processing, liquid jet processing, fluid dynamic grinding, etc. Fluid dynamic grinding is driven by hydraulic pressure, which causes the liquid medium carrying abrasive particles to flow back and forth at high speed over the workpiece surface. The medium is mainly made of a special compound with good flowability under relatively low pressure and mixed with abrasives, and the abrasives can be silicon carbide powder.

6. Magnetic grinding and polishing

Magnetic grinding and polishing uses magnetic abrasives to form abrasive brushes under the action of a magnetic field to grind the workpiece. This method has high processing efficiency, good quality, easy control of processing conditions and good working conditions. With suitable abrasives, the surface roughness can reach Ra0.1μm.