How to use the polishing machine

2022-06-22
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How to use the polishing machine

usage and precautions of polishing machine

after spraying, the automobile surface may have small defects on the surface of the paint film, such as coarse particles, sandpaper marks, flow marks, anti whiteness, orange peel, etc. in order to make up for these defects, grinding and polishing are usually carried out after spraying, so as to improve the mirror effect of the paint film and meet the requirements of brightness, smoothness and beauty. Here, let's learn about the structure and operation precautions of the polishing machine

the polishing machine is composed of basic components such as base, throwing plate, polishing fabric, polishing cover and cover. The motor is fixed on the base, and the cone sleeve for fixing the polishing disc is connected with the motor shaft through screws. The polished fabric is fastened on the polishing disc through the ferrule. After the motor is powered on and started through the switch on the base, the sample can be polished on the rotating polishing disc by hand. The polishing liquid added in the polishing process can flow into the square plate next to the polishing machine through the drainage pipe of the plastic plate fixed on the base. The polishing cover and cover can prevent dust and other sundries from falling on the polished fabric when the machine is not in use, which will affect the use effect

The key to the operation of the polishing machine is to try to obtain the maximum polishing rate so as to remove the damaged layer during polishing as soon as possible. At the same time, the polishing damage layer should not affect the final observed tissue, that is, it will not cause false tissue. The former requires the use of coarse abrasive to ensure a larger polishing rate to remove the polished damage layer, but the polishing damage layer is also deep; The latter requires the use of the finest material, so that the polishing damage layer is shallow, but the polishing rate is low. The best way to solve this contradiction is to divide polishing into two stages. The purpose of rough polishing is to remove the polishing damage layer. This stage should have the maximum polishing rate. The surface damage formed by rough polishing is a secondary consideration, but it should also be as small as possible; The second is fine polishing (or final polishing), which aims to remove the surface damage caused by rough polishing and minimize the polishing damage

when polishing with the polishing machine, the grinding surface of the sample and the polishing disc shall be absolutely parallel and evenly pressed on the polishing disc, and attention shall be paid to prevent the sample from flying out and generating new grinding marks due to too much pressure. At the same time, make the sample rotate and move back and forth along the radius of the rotary table to avoid local wear of the polished fabric. During the polishing process, continuously add micro powder suspension to keep the polished fabric at a certain humidity. Too much humidity weakens the effect of polishing wear marks, which makes the hard phase in the sample appear convex, and the non-metallic inclusions in steel and graphite phase in cast iron produce "tail dragging" phenomenon; If the humidity is too small, the sample will be heated due to friction, the lubrication will be reduced, the grinding surface will lose luster, or even appear black spots, and the light alloy will damage the surface. In order to achieve the purpose of rough polishing, the rotating speed of the rotary table is required to be low, preferably not more than 500r/min; The polishing time should be longer than the time required to remove the scratches, because the deformed layer should also be removed. After rough polishing, the grinding surface is smooth but dull. Under the microscope, there are uniform and fine grinding marks, which need to be eliminated by fine polishing. During fine polishing, the speed of rotary table can be properly increased, and the polishing time is appropriate to throw away the damaged layer of rough polishing. After fine polishing, the ground surface is as bright as a mirror, and no scratch can be seen under the bright field of the microscope, but the wear mark can still be seen under the phase contrast illumination

the polishing quality of the polishing machine has a serious impact on the microstructure of the specimen, which has gradually attracted the attention of relevant experts. In recent years, a lot of research work has been done on the performance of polishing machines at home and abroad. Many new models and new generation of polishing equipment have been developed. They are developing from the original manual operation to a variety of semi-automatic and full-automatic polishing machines. The following describes the performance and characteristics of several commonly used mechanical polishing machines. The polishing machine is specially used for the effect treatment of the surface and tubes of metal products such as steel, aluminum and copper. Dozens of original accessories meet different needs. It is easy to produce snowflakes, brushed lines, wavy lines, matte surfaces, mirrors, etc. with different accuracy, and quickly repair deep scratches and slight scratches, as well as quickly polish and polish; The whole welding market urgently needs reliable reassuring seams, nozzle marks, trace oxide films, stains and paints, which are suitable for deburring, forming rounded corners, decorative metal processing, and will not form shadows, transition zones and uneven decorative surfaces in the processing process. They are important equipment for metal product production lines

the polishing machine is simple in structure, but it still needs to be used correctly, and daily maintenance should be done well. The following points should be paid attention to in the use of Zhejiang Province to accelerate major technological breakthroughs in new materials. When the continuous working time of the polishing machine is too long, the friction heat generation temperature of the polishing roller is high, which is easy to scald the leather surface. It needs to be cooled before operation. Before and after work, the surface of the polishing roll shall be cleaned and waxed to keep the roll surface smooth and dust-free. During use, the pressure of the feeding roller shall be controlled properly to avoid too much resistance and the electric appliance is easy to burn out due to heating. Lubricate all rotating parts of the transmission chain to ensure accurate and reliable transmission

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