Hazards and preventive measures of high speed grinding wheel

In the use and management of grinding machines, many grinding wheel manufacturers have many potential safety hazards. If they do not pay attention to and improve, it is very easy to cause casualties. Grinding wheels are usually composed of abrasives, adhesives and reinforcing materials. When the grinding wheel rotates at high speed, it will do harm to human body. In order to reduce and prevent the occurrence of injury accidents, it is necessary to understand and master the hazard manifestation of high-speed rotation of grinding wheel, and formulate targeted preventive measures. What are the key points of daily maintenance?

1. When loading, unloading and placing the grinding wheel, if water is immersed in the grinding wheel bonded with phenolic resin, the strength of the grinding wheel will be reduced; However, the ceramic bonded grinding wheel is sensitive to temperature changes and unevenly absorbs water, which will make the grinding wheel out of balance. Therefore, when loading and unloading, it should be handled with care and placed in a dry place with shelter to maintain the normal state of the grinding wheel.

2. For the installation of grinding wheel, it is generally necessary to correctly select the grinding wheel that is consistent with the spindle speed of the grinder. The fit clearance between the inner hole of the grinding wheel and the spindle should not be too tight, which is generally controlled between 0.05-0.1mm; Flange plates shall be installed on both sides of the grinding wheel, and the diameter shall not be less than 1/3 of the diameter of the grinding wheel, and the gasket shall be well padded; When screwing the nut, use a special wrench, not too tight, and it is strictly prohibited to knock. In addition, the protective cover, baffle and bracket shall be installed. The gap between the baffle and bracket and the grinding wheel shall be kept within 1-3mm and slightly lower than the middle of the grinding wheel. After installation, operate for 5-10 minutes, and carefully observe the test process. After wet grinding, the grinding wheel should idle for a period of time to shake off the water. Because of the water resistance, the grinding wheel will be accumulated in the lower part, causing the wheel to be unbalanced, resulting in explosion in the next use.

3. The setting direction of the grinding machine, the common use of general maintenance operations, or the workplace with frequent metal cutting technology, should be installed with the grinding machine nearby. And its orientation should consider the flying direction after the grinding wheel is broken, so as to reduce the personnel activity area as far as possible to prevent accidents. Moreover, it is necessary to formulate a practical management system, which type of employees, which process, and how to process should be carefully specified. Make sure that problems can be verified, loopholes can be remedied, and responsibilities are assigned to each person.

4. In daily use, employees operating the grinder are not allowed to wear gloves, but are required to wear goggles to prevent the impact of metal dust and metal chips. People should stand on the side of the grinder; The workpiece should not be forced too hard to avoid accidents due to uneven force on the grinding wheel. During operation, it is strictly prohibited to dismantle the protective cover, baffle and bracket; And strengthen on-site supervision, find and correct violations, and take preventive measures.

5. Inspection of new grinding wheel before use. Before the grinding machine is installed, the grinding wheel can be tapped with a wooden mallet, and the intact ceramic grinding wheel will make a crisp sound; Grinding wheel with organic binder. Will make a deep sound. But the defective grinding wheel will make a crushing sound, so it cannot be used.

In short, we need to understand the hazards of high-speed operation of grinding wheels, so we should pay attention to the corresponding treatment measures when using them. Only with caution can we be in a safe state in later use, so we must pay attention to this link.