Three key steps to ensure efficient and safe grinding of grinding wheels

Before starting the grinding machine for formal grinding operation, careful preparation and careful inspection is an indispensable important link, especially for the installation, balance and dressing of the grinding wheel. The proper implementation of these three tasks will directly affect the processing quality, equipment stability and operator safety.
1. Accurate installation of grinding wheel
When installing the grinding wheel, it is necessary to maintain a rigorous and meticulous attitude. In view of the strict requirements of the grinding wheel under high-speed operation, it is necessary to conduct a comprehensive inspection before installation to ensure that the surface of the grinding wheel is free of cracks, which is the primary prerequisite for safe operation. During the installation process, it is necessary to ensure that the grinding wheel and the shaft or flange with a moderate tightness, to avoid too tight caused by thermal expansion burst, but also to prevent too loose caused by eccentric vibration. The reasonable fit clearance is usually controlled between 0.1 and 0.8mm, especially for high-speed grinding wheels. When using flange disc clamping, the diameter of the double disc should be matched, the outer diameter should be at least 1/3 of the outer diameter of the grinding wheel, and it should be supplemented by thick cardboard or oil-resistant rubber pads to ensure that the pressure is evenly distributed, and the force is moderate when tightening the nut to prevent the grinding wheel from breaking. Special attention should be paid to the rotation direction of the fastening thread, which should be opposite to the rotation direction of the grinding wheel, and the grinding force should be used to tighten the nut naturally.
2. Strict grinding wheel balance
For grinding wheels with a diameter of more than 125mm, balance adjustment is the key to ensure stable operation. Unbalanced grinding wheel will produce severe vibration in high-speed rotation, which not only damages the processing quality and machine tool accuracy, but also may cause mechanical failure and even grinding wheel fragmentation. The balance adjustment aims to make the center of gravity of the grinding wheel coincide with the axis of rotation accurately. It can be realized by static balance or dynamic balance method, depending on the grinding speed and accuracy requirements. During static balancing, the grinding wheel is placed on the balancing device, and the position of the balancing block is adjusted until the grinding wheel can be stably stationary at any position. Before installation, it is necessary to check the grinding wheel again for cracks, and any crack grinding wheel is strictly prohibited. At the same time, ensure that there is an elastic backing plate with appropriate thickness between the grinding wheel and the flange, the flange diameter is matched, and the gap is reasonable to prevent the thermal expansion of the spindle from causing damage to the grinding wheel.
3. Regularly dressing the grinding wheel
As the grinding process progresses, the abrasive particles on the surface of the grinding wheel will gradually blunt or be blocked, resulting in a decrease in cutting ability, a deterioration in surface quality and a decrease in grinding efficiency. Therefore, regular dressing of the grinding wheel is essential. Dressing is designed to remove the surface passivation abrasive and restore the sharpness and geometric accuracy of the grinding wheel surface. In the dressing process, appropriate dressing tools and methods should be selected according to the grinding wheel wear and processing requirements to ensure that the grinding wheel after dressing can complete the grinding task efficiently and stably. At the same time, pay close attention to the vibration and noise in the dressing process, and adjust the dressing parameters in time to avoid the adverse effects of excessive dressing on the grinding wheel and workpiece.