What is the role of the polishing disc in the polishing process? Many people think that the polishing disc is also a part of the grinding and cutting force, and its coarseness will also affect the cutting effect.
In fact, polishing discs only provide an intermediary role in the polishing process, and usually they do not provide any cutting work. Different materials of discs drive the movement of abrasive particles in different ways, so they produce different cutting effects. So let's sort out the working principle of the three types of polishing discs.
Sponge discs
Sponge discs are made of sponges with different structures and densities, and cut into different shapes.
In the process of working, the sponge disc will store and push the abrasive particles with its own polygonal cell structure. The actual area of contact between the sponge and the paint surface during the work may be less than 10% of the surface area.
We look closely at all the abrasives are actually concentrated on the "side" of the cell polygon, and because of the cell structure, the abrasives can easily communicate between different cells, without the need to smear the abrasives in the entire sponge disc can be evenly distributed.
The thickness of the sponge disk is actually the size of the cells, the larger the cells, the greater the storage capacity. The smaller the cells, the denser the surface and the more evenly the abrasive particles roll.
There will also be a difference in the hardness and softness of the sponge disc, the difference is that different machines need different support capacity of the sponge disc, and in fact, the same machine sponge disc, coarse sponge than fine sponge to hard reason, simply because the larger the cell volume, the sponge needs higher hardness to achieve the same shape.
Wool disc
As the name implies, wool discs are polishing discs made of wool.
The nature of wool is similar to our hair, each wool is a delicate hair.
During the working process the wool disc is rolled to drive the abrasive particles to work, this driving method provides more kinetic energy to drive a coarser and less lubricated abrasive.
Fiber discs
There are similarities and differences between fiber discs and wool discs. The similarities lie in the fact that both fiber and wool discs are macroscopically characterized by hair-like structure and outstanding cutting ability.
One of the differences is that each fiber is many times finer than wool, but a fiber is made up of thousands of filaments. So one fiber is about 60 times thicker than wool, and the surface area is hundreds of times larger.
Another difference is that the fiber has the ability to stow, it is working in a "grab" or "scratch" way to drive the abrasive particles work. If you can't understand it, imagine the brush of an automatic car wash, the cutting power is not very amazing. Many people underestimate the ability of fiber discs, in fact, fiber discs are the polishing discs that are easy to heat up and have strong cutting power.
Selection of polishing discs
Once we understand how different polishing discs work, it's time to understand when we need to use what kind of polishing disc to finish our work.
A very important point is that the choice of polishing disc depends on the paint.
In fact, it is not, the polishing disc is only an intermediary, so what is the important role of the intermediary? Of course it is to provide what you need.
We need to understand the paint first, so that we can in turn find out what kind of disc to use to match the paint situation, and then find out the right machine to match the agent.
Sponge discs
The original paint is very suitable for grinding, but also suitable for using medium cut disc to deal with oxidation layer, sticky car paint, metal surface, because when the car paint produces a lot of polishing waste, it needs to have cell structure to store to prevent secondary grinding.
Wool discs
Suitable for cutting with sticky car paint, cutting with hard paint. Wool discs are very susceptible to dazzle patterns on paint that is too soft.
Wool discs are highly recommended by paint stores for restoration after water sanding because the paint is not yet cured and the waste generated by polishing will be more, and wool discs do not have storage capacity so they are easy to clean.
Fiber discs
It is suitable to cope with very hard paint, and the possibility of polishing to produce dazzling lines will be much lower than wool disc.
The disadvantage is that it is very easy to carry the polishing waste and make it difficult to remove.
Use of polishing discs
There are also many aspects of polishing disc use that need attention.
Do not let the polishing discs be distorted by crushing during storage, which can affect the balance. Before use, it is necessary to "warm up" the discs so that both the discs and the abrasive reach the ideal working temperature.
Especially for fiber and wool discs, the entire disc must be coated with abrasive to allow each fiber and wool to absorb enough lubrication to reduce the glare pattern.
Do not tear the polishing discs during the replacement process to ensure the service life of the discs, and clean them in time after use to prevent dust accumulation.