After spraying the surface of the car, there may be fine defects in the surface of the film, such as coarse grain, sand paper mark, flow mark, reverse white, orange peel and so on. In order to make up for these defects, it is usually abrasive and polishing after spraying to improve the mirror effect of the film and achieve the requirements of bright, smooth and brilliant. Here we will know about the structure and operation precautions of polishing machine.
The polishing machine is composed of a base, 7906, polishing cloth, polishing cover and cover basic components. The motor is fixed on the base, and the cone sleeve of the fixed discs is connected with the motor shaft through screws. The polished fabric is fastened on the discs through a ring. After the motor is switched on by the switch on the base, the hand can be used to apply pressure to the disc to polish the rotating discs. The polishing fluid added to the polishing process can be inflow into the square beside the polishing machine through the drainpipe fixed on the plastic tray on the base. Polishing cover and cover can prevent dust and other debris falling on the polishing fabric and the effect in the machine when not in use.
The key of polishing machine operation is to try to get the maximum polishing rate, so as to remove the damage layer as soon as possible. At the same time, polishing damage layer will not affect the final observed tissue, which will not cause false tissue. The former requires the use of coarser abrasives to ensure a larger polishing rate to remove the abrasive damage layer, but the polishing damage layer is also deep; the latter requires the use of the finest material to make the polishing damage layer relatively shallow, but the polishing rate is low. The best way to solve this contradiction is to divide the polishing into two stages. The purpose of coarse throwing is to remove the polishing damage layer. This stage should have the maximum polishing rate. The surface damage formed by the rough casting is a minor consideration, but it should be as small as possible; the second is the fine throwing (or final throw), which aims to remove the surface damage caused by the rough throwing and minimize the polishing damage. Outer circle polishing machine
When the polishing machine is polished, the surface of the specimen and the discs should be absolutely parallel and evenly pressed on the discs, to prevent the specimen from flying out and producing new grinding marks due to too much pressure. At the same time, the specimen should be rotate and move back and forth along the radius direction of the disc in order to avoid the rapid local wear of the polished fabric in the process of polishing. The humidity is too much to weaken the polished grinding mark, making the hard phase in the sample floating convex, nonmetallic inclusions in steel and the "drag tail" of graphite phase in cast iron. The humidity is too low, the friction heat will cause the sample to rise, the lubrication effect decreases, the grinding surface loses luster, even the black spot, the light alloy will throw the surface. . In order to reach the goal of rough throwing, the rotating speed is low, and it is best not to exceed 500r/min; the polishing time should be longer than the time needed to remove the scratch, because the deformation layer should be removed. After rough polish smooth, but under the microscope with intense darkness without light, wear uniform, fine polishing to be eliminated. Fine polishing appropriately increasing the speed dial polishing time to remove the damaged layer of rough polishing is appropriate. After polishing, the grinding surface is as bright as a mirror. No scratches can be observed under the field of microscope, but wear marks can be seen under the condition of phase contrast illumination.
The polishing quality of polishing machine seriously affects the structure of samples, which has gradually attracted the attention of experts. In recent years, a lot of research work has been done on the performance of the polishing machine both at home and abroad. A lot of new models and a new generation of polishing equipment have been studied, which are being developed from manual operation to a variety of semi-automatic and automatic polishing machines. The performance and characteristics of several commonly used mechanical polisher are introduced below. The polishing machine is specially designed to deal with the surface and tube of the metal products such as steel, aluminum, copper and other metal products. Several dozen kinds of original accessories meet the different needs. It is easy to produce a variety of different precision snow flower lines, drawing lines, wavy lines, dumb surfaces, mirror surface and so on, fast mending depth scratches and slight scraping, quick grinding and polishing. Weld, water mark, trace oxide film, stain and paint are suitable for burr, corner formation and decorative metal processing. In the process of processing, no shadow, transition zone and uneven decorative surface are not formed. It is an important equipment for the production line of metal products.
The polishing machine is simple in structure, still need to be used correctly, and do routine maintenance. Attention should be paid to the following points when using. When the polishing machine works for a long time, the friction heat of the polishing roller is high, and it is easy to scald the leather surface. Before and after work, we should clean the surface of the polishing roller and wax and keep the roller surface smooth and dust-free. In use, control the feed roller pressure is appropriate, so as to avoid too much resistance, and the electrical heating is easy to burn out. The lubrication of each part of the transmission chain should be done well, so that the transmission is accurate and reliable.