Precautions for the use of Vitrified bond super hard grinding wheel

Precautions for the use of Vitrified bond super hard grinding wheel

A circularly-bonded abrasive having a through hole in the center made of an abrasive, a binder, or the like. The grinding wheel is the largest and the most widely used one. It can be coarsely ground, semi-finished and polished on the outer circle, inner circle, plane and various profiles of metal or non-metal workpieces. Fine grinding and grooving and cutting. There are many types of grinding wheels. According to the abrasive used, it can be divided into ordinary abrasive (corundum and silicon carbide) grinding wheel and super hard abrasive (diamond and cubic boron nitride, etc.) grinding wheel; according to the shape, it can be divided into flat grinding wheel, oblique side grinding wheel, cylindrical grinding wheel and cup grinding wheel. , disc-shaped grinding wheel, etc.; according to the bonding agent can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel and so on. The characteristic parameters of the grinding wheel mainly include abrasive, viscosity, hardness, bonding agent, shape and size. Since the grinding wheel usually works at high speed, the slewing test (to ensure that the grinding wheel does not break at the highest working speed) and the static balance test (to prevent machine vibration during operation) should be performed before use. After the grinding wheel has been in operation for a period of time, it should be trimmed to restore the grinding performance and the correct geometry.

The use of grinding wheels is dangerous. For your safety, please note the following precautions:

Grinders are one of the most commonly used machines in machinery factories. Whether it is installed properly and meets the safety requirements; whether it is used correctly and in compliance with the safe operating procedures. These problems are directly related to the personal safety of each employee, so we must pay enough attention to us in actual use.

1, the precautions during the installation process

Positioning problem: Where is the grinder installed? It is the first problem to be considered during the installation process. Only when a reasonable and appropriate position is selected can we carry out other work. Grinding machines are forbidden to be installed in the vicinity of the equipment and operators or in places that are often visited. Generally, larger grinder rooms should be installed in the larger workshops. If it is not possible to set up a special grinder house due to the limitation of the topography of the plant, a protective baffle of not less than 1.8 m in height should be installed on the front side of the grinder, and the baffle plate is required to be firm and effective.

Balance problem: The imbalance of the grinding wheel is mainly caused by the inaccurate manufacture and installation of the grinding wheel, which makes the center of gravity of the grinding wheel not coincide with the rotary shaft. The damage caused by imbalance is mainly manifested in two aspects. On the one hand, when the grinding wheel rotates at high speed, it causes vibration, which is easy to cause polygonal vibration marks on the surface of the workpiece. On the other hand, the imbalance accelerates the vibration of the main shaft and the wear of the bearing. This can cause the grinding wheel to rupture and even cause an accident. Therefore, it is required that the grinding wheel of the public building with a straightness greater than or equal to 200mm should be statically balanced after the chuck is installed. When the grinding wheel is deformed after plastic shaping or during work, the static balance should be repeated.

Matching problem: The matching problem mainly refers to the installation and matching of the chuck and the grinding wheel. According to the standard requirements, the diameter of the grinding wheel chuck should not be less than 1/3 of the diameter of the mounted grinding wheel, and the new grinding wheel should be replaced when the corresponding grinding wheel is worn to a diameter 10 mm larger than the diameter of the chuck. In this way, there is a problem of matching the chuck and the grinding wheel. Otherwise, there will be such a situation that the “large horse-drawn carriage” causes waste of equipment and materials; the “small horse-drawn carriage” does not meet the safety requirements and is liable to cause personal accidents. Therefore, the reasonable matching of the chuck and the grinding wheel can save equipment and cut the material on the one hand, and meet the requirements of safe operation on the other hand. In addition, a cushion with a diameter larger than 2 mm of the chuck and a thickness of 1 mm to 2 mm should be installed between the grinding wheel and the chuck.

Protection problem: The protective cover is the most important protection device of the grinder. Its function is: When the grinding wheel is damaged due to work, it can effectively cover the grinding wheel debris and ensure the safety of personnel. The shape of the wheel guard is round and square, and the maximum opening angle is not allowed to exceed 90°; the material of the shield is steel with a tensile strength of not less than 415 N/mm2. When replacing a new grinding wheel, the protective cover should be installed firmly and reliably, and the protective cover should not be dismantled or discarded.

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