Classification and Operation Principle of Buffing Machine
Buffing machine, also known as grinding machines, is often used for mechanical grinding, buffing, and waxing.
Classification of buffing machine
According to the power source, there are two types: pneumatic and electric. The pneumatic type is relatively safe, but requires a gas source. The electric type is easy to solve the power supply problem, but electrical safety must be taken seriously.
According to the functional classification, there are two types: dual-purpose industrial sanding/buffing machines and simple buffing machines. The dual-purpose industrial sanding and buffing machine can be fitted with a grinding wheel to grind metal materials and can also be fitted with a buffing disc for paint care. This machine is heavier, around 2-3 kg, but works very stably and is not easily damaged.
The speed of this type of machine can be adjusted, suitable for professional beauty and skin care personnel. The simple buffing machine is actually a drilling machine, with a small size and a non-adjustable speed. It is difficult to control the balance when in use, so professional beauty and skin care personnel generally do not use this type of machine.
According to the speed classification, there are three types: high-speed buffing machine, medium-speed buffing machine, and low-speed buffing machine. The high-speed buffing machine has a speed of 1750-3000 r/min, and the speed can be adjusted; the medium-speed buffing machine has a speed of 1200-1600 r/min, and the speed can be adjusted; the low-speed buffing machine has a speed of 1200 r/min, and the speed cannot be adjusted.
Working principle of buffing machine
The key to operating a buffing machine is to obtain the maximum buffing rate as quickly as possible to remove the damage layer produced during buffing. At the same time, it is necessary to prevent the buffing damage layer from affecting the final observation of the tissue, that is, not to create false tissue.
To achieve the former, coarser abrasive materials should be used to ensure a larger buffing rate to remove the damage layer produced during buffing, but the buffing damage layer will also be deeper. To achieve the latter, the finest materials should be used to make the buffing damage layer shallower, but the buffing rate will be lower.
The best way to solve this contradiction is to divide the buffing into two stages.
The coarse buffing aims to remove the damage layer produced during buffing. This stage should have the maximum buffing rate, and the damage layer produced during coarse buffing should be considered, but must be minimized if possible. The second stage is fine buffing (or final buffing), which aims to remove the surface damage produced during coarse buffing and minimize the buffing damage.
When buffing with a buffing machine, the surface of the sample and the buffing disc should be parallel and evenly pressed on the buffing disc, and care should be taken to prevent the sample from flying out or creating new scratches due to excessive pressure.
At the same time, the sample should rotate itself and move back and forth along the radius of the disc to avoid local wear of the buffing cloth. During the buffing process, micro-powder suspension should be added continuously to keep the buffing cloth moist.
If the humidity is too high, the buffing scratch effect will be weakened, resulting in a protrusion of the hard phase in the sample and a "tailing" phenomenon of non-metallic inclusions in steel and graphite in cast iron. If the humidity is too low, the sample will heat up due to friction, the lubrication effect will be reduced, the polished surface will lose its gloss, black spots may appear, and the surface of light alloys may be polished away.
To achieve coarse buffing, the disc speed should be relatively low, preferably not more than 600 r/min. The buffing time should be longer than the time required to remove scratches, because the deformation layer also needs to be removed. After coarse buffing, the surface will be smooth but dull, with uniform and fine scratches visible under a microscope, which will be removed by fine buffing.
During fine buffing, the disc speed can be appropriately increased, and the buffing time should be sufficient to remove the damage layer produced during coarse buffing.
After fine buffing, the surface will be bright as a mirror, and no scratches will be visible under a microscope under normal lighting conditions, but they will still be visible under the same illumination conditions. The quality of the buffing by the buffing machine seriously affects the structure of the sample, and has gradually attracted the attention of relevant experts.
A large amount of research has been done on the performance of buffing machines at home and abroad, and many new models and new generations of buffing equipment have been developed, which are gradually shifting from manual operation to various semi-automatic and fully automatic buffing machines.