Keywords: tank, oil, quench tank, quenching oil, quenching, cooling,

　　1. oil quench tank should be cleaned regularly. Usually for six months to a year. At ordinary times, special attention should be paid to avoid the pollution of quenching oil.

　　 2. Avoid using too high or too low temperature. The temperature of quenching oil should be 60-80 ℃. The temperature of the oil is high: the temperature gradient of the workpiece and the oil temperature is reduced, thereby reducing the cooling capacity. In addition, high temperature quenching oil deteriorates quickly.

Low oil temperature: increase in kinematic viscosity, blocking the normal flow of quenched oil. And because of the large kinematic viscosity, the quenching oil pulled out of the workpiece will also increase.

　　3 Use mechanical oil instead of quenching oil: mechanical oil is still used to replace quenching oil in processing plants. On the one hand, it comes from cost considerations; on the other hand, it is due to habit. The special type of heat treatment oil is added with antioxidants, which greatly improves the service life and saves a lot of energy and materials for the country. In addition, the special heat treatment oil is superior in terms of product quality and actual operating environment.

　　4. Dissolved water removal: water in quenching oil has three states: deposited water or emulsified water, suspended water. This water is particularly difficult to remove and can usually be removed by heating. The water in the oil cannot be completely removed by natural settlement. Therefore, the quenching oil tank should be specially maintained and no water can penetrate.

　　 5. Remove carbon black and oxide skin carbon black, oxide skin are all adsorbents, adsorb additives in quenching oil, accelerate the deterioration of quenching oil performance parameters, and remove sludge together will also improve the quality of quenching oil.

　　 6. Improvement of quenching oil: The performance of quenching oil will change during long-term use. The quickest way to eliminate some negative effects is to add compounding agent. Adding compound can restore and improve the cooling performance, brightness and oxidation resistance of quenching oil, adding compound is the toughest way to transform quenching oil, and the cost is low.

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