Grinding wheel is an efficient but potentially risky tool. In order to ensure the safety of operators, prolong the service life of grinding wheels and ensure the processing quality, please strictly observe the following precautions and maintenance requirements:
Precautions before use
1. Carefully check the grinding wheel: Appearance inspection: The grinding wheel must be carefully inspected for cracks, notches, breakage or any visible damage before use. It is forbidden to use defective grinding wheels! Mark check: Make sure that the mark of MAX RPM on the grinding wheel is clear, and absolutely ensure that the maximum speed of the grinding wheel is much higher than the rated speed of the spindle of the grinding machine.
No speeding! Static balance test: For grinding wheels with large diameter or high precision requirements, static balance test should be carried out before use to ensure smooth operation and reduce the risk of vibration and fracture. Matching confirmation: ensure that the type (resin/ceramic/diamond /CBN, etc.), particle size, hardness, binder, shape and size of the selected grinding wheel fully meet the current grinding task (workpiece material, processing requirements and equipment parameters).
Protective device in place
Cleaning the contact surface: thoroughly clean the contact surface of the spindle flange, grinding wheel clamping flange and grinding wheel itself to ensure that there is no oil, dust or foreign matter. Use qualified flange: Clamping flange with proper size, no deformation and good condition must be used. The diameter of the flange should not be less than 1/3 of the diameter of the grinding wheel. Uniform clamping: use matching qualified nuts and washers to tighten the flange nut evenly and symmetrically, with moderate force (avoid flange deformation or grinding wheel fracture due to over tightening, and loose grinding wheel due to over loosening). Retaining gasket: Ensure that an appropriate and clean elastic gasket (such as cardboard and rubber gasket) is used between the flange and the grinding wheel to evenly distribute the clamping force and protect the edge of the grinding wheel.
Idling of the new grinding wheel: After installing the new grinding wheel, it must idle (without touching the workpiece) for at least 1 minute with the protective cover installed, and the operator should stand in a safe position on the side. Observe whether the grinding wheel runs smoothly and whether there is abnormal vibration or noise. If there is any abnormality, stop the machine immediately for inspection.
Safety precautions in operation
1. Wear personal protective equipment (PPE): Goggles/masks: Safety goggles or protective masks are mandatory to prevent splashing abrasive particles, sparks or debris from hurting eyes. Hearing protection: Wear earplugs or earmuffs according to the noise level. Protective clothing: Wear tight work clothes without loose parts. It is forbidden to wear gloves, ties, jewelry and other items next to the equipment that may be involved. Respiratory protection (if necessary): When operating in a dusty environment, you need to wear a qualified dust mask or respirator.
2. Safety operation specifications: Start and stop: after starting the grinder, grinding can only be started after the grinding wheel reaches full speed. After grinding is completed, the workpiece should be withdrawn first, and then the grinding wheel should stop rotating. Feed force control: it is forbidden to press the workpiece against the grinding wheel with excessive force. Pressure should be applied smoothly and evenly to avoid impact load. Grinding position: try to grind on the front of the grinding wheel to avoid putting pressure on the side of the grinding wheel.
Stay focused: Pay attention during the operation, and always pay attention to the running state of the grinding wheel, the condition of the workpiece and whether there is abnormal sound or vibration. No refitting: It is absolutely forbidden to refit the grinding wheel (such as padding paper, filling holes, etc.) without permission in order to improve the speed or adapt to different apertures.
