What is the speed of quenching and oil cooling?

According to the advantages of oil, the cooling rate in the low temperature zone is much smaller than that of water, which can greatly reduce the microstructure stress of the quenched workpiece, and reduce the tendency of the workpiece to crack and deform, but the low cooling capacity in the high temperature range is its main disadvantage, but for the alloy steel with supercooled austenite is relatively stable.

Oil is a suitable quenching medium, contrary to water, increasing the temperature can enhance the fluidity, so it can improve the cooling capacity of the high temperature range, and generally control the oil temperature between 60-80 degrees. If your workpiece is relatively large, you should increase the mixing machine, so that the vaporization film generated on the surface of the workpiece rupture as soon as possible, to ensure a certain cooling rate, and at the same time, after a certain period of time, to replace the oil, otherwise due to aging, the oil loses its inherent ability The final view is that the mixing speed should be determined by looking at the size of the workpiece and the performance requirements for the workpiece (determining the cooling rate), of course, the faster the cooling rate, the faster the cooling rate, and the tissue may become a supersaturated state. Whether this kind of organization is what you require, I don't know very well, now the factory has no specific stirring speed regulations for oil quenching with large workpieces, and in order to ensure that it is not deformed, the application of pressure quenching machine is relatively extensive, so that sometimes, there is no concept of stirring speed at all, I hope what I said can be useful to you.

I don't agree with the statement upstairs, I personally think that hot oil reduces the cooling rate of quenching, which is not good for the hardness increase, but contributes to the reduction of quenching stress. As for stirring, it can be said to keep the temperature of the cooling medium uniform, or it can be said to accelerate heat dissipation. [

According to the structure and technical requirements of the parts, the parts are thin-walled and easily deformable parts, and static oil cooling can be used. If the thickness of the section of the part is large and the hardness of the core is required to be high, strong stirring can be used. Specific.

What exactly is the problem? Hehe, machine.

1. Inject compressed air after water removal into the quenching oil to stir the oil, which can speed up the cooling;

2. Choose oil with low viscosity, and keep the oil at an appropriate temperature, about 40 degrees, not too low, so viscosity is large, not too high, so high temperature cooling and slow;

3. The operation method of water quenching and oil cooling is adopted, that is, the water is discharged at high temperature and the oil is discharged at low temperature, which is equivalent to using water to adjust the slow cooling of the oil, but this requires experience and is more suitable for single operation;

4. Quenching solution is used instead of quenching oil, so that the cooling rate can be adjusted by adjusting the concentration, so as to avoid the water cooling too fast and cracking, and the oil cooling too slow and not hard, that is to say, an intermediate value can be taken.

The most direct way is to add Cui refrigerant.