The tools used in grinding are mainly grinding and polishing machines, which can be divided into single speed grinder, double speed grinder and multi speed grinder according to their speed. The following is the operation method of grinding and the specific matters needing attention.
1. Operation method of grinding
The first step is to thoroughly remove the dirt on the paint surface with wax washing liquid before grinding, but it does not need to be wiped dry, and cover the air inlet of the hood with a large towel to prevent the abrasive from splashing on the air inlet fan blade during operation.
The second step is to wet the sponge head with clean water and evenly apply the abrasive on the grinding head on the working face.
The third step is to turn on the machine before grinding, and then put the polishing machine on the paint surface gently and slowly. Note that the pressure should be gradually increased evenly, and the force should be lighter and lighter near the end of grinding.
The fourth step is to gently lift on the working face to prevent the halo marks that cannot be removed in the next polishing process after grinding.
2. Precautions for grinding operation
① In order to prevent the dust from falling on the working surface and forming scratches during the grinding process, the grinding operation should be carried out in a wet environment, and it is not necessary to dry the water droplets on the car body paint surface after car washing.
② Operators should wear uniform work clothes to prevent buttons or belt clips on the clothes from scratching the body paint.
③ Grinding should be carried out as the pretreatment of polishing process. After grinding, the car body should be thoroughly cleaned with wax washing liquid before polishing process.
④ During the operation, the construction should be carried out according to the sequence of the car plate, and there should be no missing parts. The grinding force should be lighter and lighter to prevent halo imprinting after grinding.
⑤ The edges and corners shall not be ground too much to avoid missing the surface paint. During operation, avoid grinding to any parts other than the body paint.