Explanation of the operation of the hottest polish

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The polishing machine is composed of a base, a throwing pan, polishing fabric, a polishing cover, a cover and other basic elements. The inclined impact testing machine is an ideal choice. 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 applying pressure 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 get the maximum polishing rate pointed out by Liu Yanlong, 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 coarser abrasives to ensure a larger polishing rate to remove the polished damage layer, but the polishing damage layer is also deeper; 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 should be absolutely parallel and evenly pressed on the polishing disc, and attention should be paid to prevent the sample from flying out and generating new grinding marks due to too much pressure. At the same time, the sample should also rotate and move back and forth along the radius of the rotary table to avoid local wear of the polished fabric too fast. During the polishing process, micro powder suspension should be continuously added to keep the polished fabric moist. Too much humidity weakens the grinding mark effect of polishing, making the hard phase in the sample appear convex and the non-metallic inclusions in steel and the graphite phase in cast iron produce the phenomenon of "tail dragging"; 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, and even black spots will appear, 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 scratch, because the deformation 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 the rotary table can be appropriately increased, and the polishing time is appropriate to throw away the damaged layer of rough polishing. After fine polishing, the grinding surface is as bright as a mirror, and no scratches can be seen under the bright field of vision of the microscope, but the grinding marks can still be seen under the phase contrast illumination

The polishing quality of the polishing machine has a serious impact on the tissue structure 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, and many new models and new generations of polishing equipment have been developed. They are developing from the original manual operation to various semi-automatic and full-automatic polishing machines. The following describes the performance and characteristics of several commonly used mechanical polishing machines. Polishing machine specially deals with the surface and tubes of metal products such as steel, aluminum and copper. Dozens of original accessories meet different needs, and easily produce snowflakes, brushed lines, wavy lines, matte surfaces, mirrors, etc. with different accuracy. It can quickly repair deep scratches and slight scratches, and quickly polish and Polish; Weld, accelerate optimization of stock; To standardize market-oriented operation, nozzle marks, traces, oxide films, stains and paints are applicable to deburring, forming rounded corners and decoration. Next, let's take a look at the specific installation steps of the fixture of the tensile testing machine. Metal processing will not form shadows, transition zones and uneven decorative surfaces in the processing process. It is an important equipment of the metal product production line

the polishing machine is simple in structure, and it still needs to be used correctly. Do a good job in daily maintenance. Pay attention to the following points in use. 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 should be cleaned and waxed to keep the roll surface smooth and dust-free. In use, control the pressure of the feeding roller appropriately to avoid too much resistance, and the electric appliance is heated and easy to burn out. Lubricate the rotating parts of the transmission chain to keep the transmission accurate and reliable

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