Preparation of printed circuit board metal surface

To meet today's stringent technical standards, printed circuit board surface status is a critical factor. As a result, manufacturers spend a lot of time and money on the use of burrs, cleaning, brushing and grinding to adjust the metal surface. 

In all materials, non-woven products are best used. When non-woven materials are used for various polishing, brushing and deburring, it has the advantages of high strength, good durability and long service life. The material's plasticity ADAPTS to the more complex shape of the surface. Non-woven materials can give a lot of products the desired uniform polishing, brushing and appearance requirements. The key to the excellent performance of non-woven materials is its rebound and hollow structure. This structure allows cold operation to prevent buckling and surface distortion. 

The abrasive analysis of the mill wheel is divided into six types: 

1. In the abrasive series, the grinding wheel has the most cutting ability, which is designed for grinding materials. It can quickly cut large defects from the hardest surface. 

2, emery cloth or sandpaper, perhaps the most widely used form of abrasive, it not only used in metal processing, can also be used with other aspects, such as plastic surface processing, have a good polishing effect. 

3. Steel wire wheel for serious defects of metal surface. 

4. Nylon fiber brush, used for the treatment of minor defects or oxidation films on metal surfaces. 

5. Polished cloth wheel can be used to cut a small amount of metal and provide mirror polishing. 

6, non-woven abrasive is to control the material cutting and cleaning the surface material, the ideal of bonded abrasive particles in the synthesis of circular column surface, and at a different speed relative to deal with the burr on the surface of the plate or brushing, to achieve the ultimate goal of pretreatment. 

2. Cleaning and brushing 

The most widely used materials for cleaning and brushing are quartz sand. There are four different types and sizes of quartz sand for cleaning and brushing. Quartz sand is made of alumina, silicon carbide, aluminum silicate, talcum powder, etc. Materials are made into various products, including cleaning and brushing roller, printing line scrubbing, etc. 

The surface velocity of the wheel 

The surface velocity of the wheel is a very important factor, and the higher speed provides a good surface state. In particular, it is ideal to remove the burr after drilling. But too high wheel speed can cause overheating on the surface of the brush, reducing the life of the product and scrapping. 

4. Pressure 

When going to burr, according to the thickness of the plate and the thickness of copper foil, it is required to have the proper pressure, excessive pressure will lead to the product life reduced. The principle of pressure is based on the state and requirements of the board. Use as little pressure as possible to achieve desired technical results.