What should I pay attention to when using the quenching oil of induction heating equipment?

1. Precautions for using new oil in the whole tank

Before pouring new oil, you must carefully check and clean the quenching oil tank, cooling system and oil storage tank. If the original oil residue and sludge are mixed into the new oil, it will not only affect the brightness of the oil, but may also change the cooling characteristics of the oil.

After the whole tank is filled with new oil, it is generally not suitable to be used for quenching immediately. A small amount of air is always introduced during the reproduction, transportation and dumping of the quenching oil. The air dissolved in the quenching oil and the scattered cheongsam will reduce the cooling rate of the quenching oil in the high temperature stage and should be removed. This can be removed by increasing the oil temperature (principle: the solubility of the gas in the oil decreases with the increase of the oil temperature, and increasing the oil temperature can reduce the viscosity of the oil and facilitate the floating of bubbles).

2. Regarding the use temperature of the oil

The allowable and recommended operating temperature ranges are specified for all quenching oils. Within the specified range, the operating temperature can be determined according to the actual situation. Appropriately increasing the oil temperature can reduce the viscosity of the oil, so that the quenching and cooling capacity of the oil is slightly improved. If the oil temperature is too high, the cooling capacity will be reduced due to the reduced temperature difference with the workpiece.

When the oil temperature is high, the oxidative deterioration of the oil is fast; when the oil temperature is low, the oxidative deterioration of the oil is slow. The cooling circulation system of the quenching oil should be kept in good condition to stabilize the temperature of the quenching oil within the required range. At the same time, in order to prolong the service life of the oil, the excessively high oil temperature should be used less frequently.

3. Stirring of quenching oil

Good agitation can prevent local oil temperature from being too high, and make the oil temperature in each part of the tank tend to be uniform. Stirring can increase the relative fluidity between the workpiece and the quenching oil, thereby increasing the cooling capacity of the oil.

The setting of the stirring device and the mounting method of the workpiece should try to make the workpieces in different parts of the same batch of quenching obtain basically the same oil temperature. Part of the workpiece or the local relative flow of the workpiece is too high or too low, which will adversely affect the uniformity of quenching and cooling.

4. Oil pollution and prevention

The pollution sources of the quenching oil include: external pollution, such as the oxide scale brought by the workpiece, the water leaked from the cooler and other substances from the outside; self-pollution, which cannot be automatically discharged during use and remains in the oil Oxidation deterioration products; plus the residual products after the reaction of foreign pollutants and quenching oil.

The accumulation of internal and external pollutants will gradually change the color, viscosity, flash point, acid value, etc. of the oil. This change process is the deterioration process of the quenching oil, which will change the cooling characteristics of the oil and the brightness of the workpiece after quenching. Difference. Changes in cooling characteristics often change the quenching hardness, quenching depth and deformation of the workpiece.

Preventing and reducing external pollution, rational use and management of quenching oil, and regular filtering can all slow down the deterioration of the oil and prolong the service life of the quenching oil. For serious pollution, decontamination treatment can be done to remove most of the pollutants and restore the cooling characteristics of the oil.