Cooling after overheating can be divided into two scenarios: temporary cooling during processing and cooling after dressing and storage. The methods differ:
Temporary Cooling During Processing (Normal Grinding Overheating)
Intermittent Grinding Cooling: The simplest method is to increase the idle stroke interval. Pause the feed every 1-2 minutes of grinding, allowing the grinding wheel to idle for 30 seconds to dissipate heat naturally through airflow. This avoids continuous heat accumulation and is suitable for small-batch manual processing.
External Water Cooling (Suitable for Wet Grinding Equipment): If the equipment supports wet grinding, directly spray the grinding area of the grinding wheel with low-pressure flowing cold water to remove grinding heat. This significantly reduces the surface temperature of the grinding wheel and also reduces dust. Experiments have shown that water cooling can increase the durability of the grinding wheel by 1.5-2 times. Note that the grinding wheel must be thoroughly dried after processing before storage to prevent the resin from absorbing water and affecting its strength.
Compressed Air Cooling: For dry processing scenarios where water is unsuitable, compressed air nozzles can be directed at the grinding area to forcefully remove heat. This does not affect the performance of the resin binder and also prevents dust from clogging the pores.
Cooling After Molding (Cure and Removal from Furnace)
This describes the cooling requirements for resin grinding wheels during production, which vary depending on the type of wheel:
Ordinary Grinding Wheels: Forced cooling can be used. A blower is used to cool the wheels until the overall temperature drops below 60°C before removal from the furnace for storage.
Special Specification Grinding Wheels: Fine-grained, high-hardness, thin-plate grinding wheels, and graphite grinding wheels cannot be forced to cool. They must be allowed to cool naturally. The furnace door should not be opened immediately after hardening. The wheels need to be slowly cooled with the furnace until they reach 60°C before removal from the furnace to prevent cracking and deformation due to thermal stress.
