What is Sanding ?
Sanding is a processing method that generally refers to the use of rough objects (sandpaper with higher hardness particles, etc.) to change the physical properties of the surface of the material through friction. Its purpose is to meet the corrosion resistance, wear resistance, decoration or other special functional requirements of the product.Mechanical Sanding is a common method of surface treatment, which uses sandpaper, Sanding board and other tools to rub the surface of the workpiece to remove burrs, rust, oil, etc. At the same time, it can also change the surface roughness by controlling the strength and way of Sanding , and enhance the adhesion of the coating or paint.
For example, in model making, full-key sanding refers to the use of sandpaper and sanding boards to smooth the surface of the part to improve the completion and detail of the model.
Functions
- Removing surface defects: Sanding can remove the oxide layer, burr, scratch and rust and other defects on the surface of the object, making the surface more smooth, smooth and beautiful.
- Improving the surface finish: Sanding can make the surface of the object smoother, improve the brightness and clarity of the reflected light, and enhance the color and texture of the object.
- Improving surface tightness: In the processing of metal materials, Sanding can also improve the tightness of the surface of the object and increase the corrosion resistance and oxidation resistance of the material.
- Meetting the required geometry: Sanding allows the surface of the object to reach a specific shape and precise size to meet the required design requirements and mechanical properties.
Process requirements
- Choosing the right abrasive, Sanding wheel, Sanding head: according to the characteristics of different materials, hardness and shape of the surface of the object, choose the exact Sanding tool to achieve the desired effect.
- Mastering the correct Sanding skills: when Sanding , it is necessary to follow the more standardized operating procedures. The problems that need attention are: do not wear too much; Shall not produce hot cracks and deformation; Do not produce excessive abrasive dust, etc.
- Operation specification: The machine/tool should be adjusted to the correct speed when Sanding , and the reasonable choice of Sanding tools also needs to gradually reduce the particles in order to get a better Sanding effect. In addition, a reasonable reduction in friction is needed to generate gravity.
- Maintain good health habits: Wear protective equipment when polishing to ensure a clean working environment.
What is polishing?
Polishing refers to the use of mechanical, chemical or electrochemical action to reduce the surface roughness of the workpiece in order to obtain a bright, flat surface processing method. Is the use of polishing tools and abrasive particles or other polishing media to modify the surface of the workpiece.
The difference between Sanding and polishing
Sanding is mainly to make the surface of the object flat, and polishing is to make the surface of the object smoother and higher gloss. From the point of view of the accuracy level of surface roughness, the precision of polishing is higher than that of Sanding . It can be said that polishing is the previous process of polishing, and only after polishing can the polishing process be carried out. General polishing refers to the polishing of the mirror effect, which is called polishing.
The difference between them is that the surface treatment degree of polishing is better than that of polishing, polishing is mainly for objects with relatively high roughness, and polishing objects with low roughness.
Polishing uses mechanical, chemical or electrochemical action to achieve brightness and smoothness through regular dissolution. Polishing can not improve the dimensional accuracy or geometric accuracy of the workpiece, but for the purpose of obtaining a smooth surface or mirror gloss, and sometimes to eliminate gloss (extinction). Usually polishing wheel as a polishing tool, polishing wheel is generally used a layer of canvas, felt or leather is stacked with metal plates on both sides, and its rim is coated with a polishing agent composed of a uniform mixture of micro-powder abrasive and grease. When polishing, the high-speed rotating polishing wheel (the circular speed is above 20 m/s) presses the workpiece, so that the abrasive produces rolling and micro-cutting on the surface of the workpiece, so as to obtain a bright machining surface.
Application of Sanding and polishing
Sanding and polishing have a wide range of applications in both industrial and home decoration. In industrial production, Sanding and polishing are important surface treatment methods, which are used to manufacture high-precision products such as automobiles, electronic products, and aviation devices. In home decoration, Sanding and polishing are used for the surface treatment of the floor, tile, marble and so on. In furniture manufacturing, polishing is also an essential step in making high-quality furniture.
