What problems can arise if the rotational speed of a grinding wheel is too high or too low during use?

The rated rotational speed of a grinding wheel is a safety threshold designed based on parameters such as material, thickness, and diameter. Operating at speeds that are either too high or too low during use can pose serious hazards or compromise performance.

When rotational speed exceeds the rated value, the grinding wheel is subjected to centrifugal forces far exceeding design standards. At this point, the internal bonding agent's tensile strength cannot hold the abrasive grains in place, making the wheel prone to sudden fracture. High-velocity flying fragments can cause fatal injuries to operators and damage surrounding equipment. Simultaneously, excessively high speeds accelerate abrasive wear, significantly shortening the wheel's service life.

When rotational speed falls below the rated value, grinding efficiency drops significantly. Abrasives fail to effectively engage the workpiece surface, causing slippage and weak grinding action. This prolongs processing time and results in surface roughness exceeding specifications. Furthermore, uneven distribution of grinding force at low speeds increases the likelihood of localized abrasive wear, causing uneven wear and loss of roundness in the grinding wheel. This further compromises machining accuracy. Excessive friction heat generated may also cause annealing of the workpiece surface, adversely affecting its properties.

Therefore, it is imperative to ensure the equipment speed precisely matches the grinding wheel's rated speed during operation. Unauthorized increases in rotational speed are strictly prohibited.