Cutting fluid control Quality assurance, flow rate control, temperature control, oxidation avoidance, filter installation, regular testing, proper replenishment, regular cleaning, and power failure protection are 9 key points to control cutting fluids.
1. Quality assurance: The performance indicators of the organic heat carrier should be strictly controlled, mainly including viscosity, flash point, carbon residue, acid value, moisture and so on. 2. Control the flow rate: the cutting fluid should be in a stable state when flowing, and have a certain flow rate. The slower the flow rate, the thicker the boundary layer, and the greater the difference between the medium temperature and the mainstream temperature, which will cause the tube wall to overheat, which will accelerate the deterioration and failure of the cutting fluid. During the operation of the hot oil furnace, the circulating oil pump cannot be stopped. 3. Temperature control: To ensure that the temperature of the cutting fluid at the outlet should not exceed the ultra-high operating temperature, the ultra-high film temperature should be less than the allowable oil film temperature, and there should always be a temperature difference between the film temperature and the temperature of the main fluid of the cutting fluid (generally 20~30℃) about). 4. Avoid oxidation: Usually, a high-level expansion tank is set to isolate the high-temperature heat carrier from direct contact with the air. The high-level tank can be filled with nitrogen for protection. If there is no nitrogen-filled protection, a certain liquid level shall be maintained, and an ultra-low liquid level alarm shall be installed. 5. Install the filter: install the filter at the inlet of the circulating pump, and the filter element material should be able to filter out the suspended polymer. The filter should be easy to remove and replace. 6. Regular test: The physical and chemical indicators of the cutting fluid should be regularly measured and analyzed, the quality change of the oil should be grasped in time, and the reasons for the change should be analyzed. In the process of using the organic heat carrier, each performance index value exceeds a certain range and must be renewed or regenerated, otherwise it can no longer be used. 7. Appropriate replenishment: Regular and appropriate replenishment of new cutting fluid can keep the residual oil in the system basically stable. The supplemented cutting fluid should be the same brand product produced by the same manufacturer, and different organic heat carriers should not be mixed. In a system that is operating in a hot state, the cold medium that has not been dehydrated cannot be directly added. 8. Regular cleaning: Thoroughly clean the cutting fluid system to clear the carbon deposits in the tube wall to reduce the furnace tube resistance. 9. Power failure protection: In the event of a sudden power failure, effective safety protection measures must be taken to avoid the coking of the cutting fluid due to the high oil temperature in a short period of time due to the power failure problem, resulting in accidents.
