Knowledge of grinding wheel

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Round consolidated abrasive tools made of abrasive and binding agent, etc.. The grinding wheel is abrasives used most widely, the largest use a, using high-speed rotation, of metal and nonmetal workpiece excircle and inner circle, plane and various type surface of roughing, semi finishing grinding and fine grinding and notching and cutting. A wide variety of grinding wheel. By the use of abrasive can be divided into ordinary abrasive wheel (corundum and silicon carbide, etc.) and super hard abrasive (diamond and cubic boron nitride grinding wheel; shape can be divided according to flat shaped wheel, bevel wheel, wheel cylinder, cup wheel, disc wheel, etc., according to the bond can be divided into ceramic grinding wheel, resin grinding wheel, rubber wheel, grinding wheel, metal. The characteristic parameters of the grinding wheel mainly include abrasive, viscosity, hardness, bond, shape, size and so on. Since the grinding wheel usually work at high speed, it should be carried out before the use of rotary test (to ensure that the grinding wheel at the maximum operating speed, not broken) and static balance test (to prevent the work caused by machine vibration). After working for a period of time, the grinding wheel should be trimmed to restore the grinding performance and the correct geometry.

The use of grinding wheel has a certain risk. For everyone's safety, the use of the following note:

Grinding wheel machine is one of the most commonly used machine equipment in the machinery factory. Its installation is reasonable, whether it meets the safety requirements; its use method is correct, whether it is in compliance with the safe operating procedures. These problems are directly related to the personal safety of every employee, so we must pay more attention to the actual use.

1 matters needing attention in installation process

Positioning of the problem of sand turbine installation in what position, is the process of installation, we must first consider the problem, only selected a reasonable and appropriate location, the grinding wheel can do other work. Grinding wheel machine is not installed in the vicinity of the equipment and operating personnel or frequently in the past, the general larger workshop should set up a special grinding wheel machine room. If you do not set the special grinding wheel machine room due to the limitation of the terrain, it should be installed on the front of the sand turbine not less than 1.8m height of the protective baffle, and the baffle board is required to be firm and effective.

The imbalance of the grinding wheel is mainly caused by the manufacture and installation of the grinding wheel, and the center of gravity of the grinding wheel is not coincident with the rotating shaft. The harm caused by the imbalance is mainly manifested in two aspects, on the one hand in wheel rotates at a high speed, causing them to vibrate, easy cause workpiece surface to produce a polygonal oscillation mark; on the other hand, the imbalance in accelerated the vibration of the shaft and bearing wear, serious will cause the wheel broken, and even cause accidents. Therefore, straight much greater than or equal to 200mm sand office floor mounted on the chuck should first static balance, grinding wheel after truing or at work found that imbalance should be repeated static balance.

The problem of matching mainly refers to the problem of the grinding wheel chuck and supporting the installation of. In accordance with the standard requirements, the grinding wheel chuck diameter shall not be less than is installed 1 / 3 of the diameter of the office building of the sand and corresponding provisions of grinding wheel wear to diameter ratio chuck diameter of 10 mm should be replaced with new grinding wheel. So that there is a matching problem of a chuck and a grinding wheel, otherwise it will appear such circumstance, "big horse drawn cart cause a waste of equipment and materials;" small horse drawn carts "and does not meet the safety requirements, easy to create adults accident. Therefore, reasonable match of the chuck and the grinding wheel, on the one hand can save equipment, cheyo materials; on the other hand and in conformity with the safety requirements. In addition, between the grinding wheel and the chuck also should be equipped with chuck diameter greater than the diameter 2mm, thickness of 1mm~2mm cushion.

Protection shield is sand turbine the main protection device, its role is: grinding wheel piece when grinding wheel at work for some reason failure to effectively covering the wheel fragments, ensure personnel safety. The shape of the protective cover of the grinding wheel is round and square two, and the maximum opening angle of the grinding wheel is not allowed to exceed 90 degrees; the material of the protective cover is not less than 415N/mm2 steel. When the new grinding wheel is changed, the installation of the protective cover is firm and reliable, and the protective cover is not allowed to disassemble or discard at will.

Block Qiao panel is grinder main door accessories of protective cover in above the horizontal spindle surface opening is greater than or equal to 30 (must be set up for this device. Its main function is to block in the process of grinding fly quietly so as not to hurt the operator. It is installed at the opening end of the protective cover, the width should be larger than the width of the wheel guard, and should be fixed firmly on the protective cover. In addition, the gap between the surface of the grinding wheel and the baffle plate should be less than 6mm.

The bracket is one of the accessories used in the sand wheel machine, and the grinding wheel diameter is more than 150mm. The distance between the grinding wheel and the bracket should be less than 1/2, but the maximum should not exceed 3mm.

The ground problem is to use the power line, so the shell of the equipment must have a good grounding protection device. It is also one of the important factors to cause accidents.

2 matters needing attention in the use of the process

Side grinding problems in the daily use of grinder, we often can freely use the side of the grinding wheel for grinding, some operators is not divided into types of grinder, grinding wheel are found. This is a serious violation of the rules for safe operation of the illegal operation behavior. According to the rules of the surface to do the work surface of the grinding wheel is not suitable to use the side of the grinding, the radial strength of the grinding wheel