Vacuum heat treatment cooling method

Two cooling methods commonly used in vacuum heat treatment

In the quenching process, cooling is an important process to achieve the purpose of heat treatment, in order to maintain the workpiece in the process of vacuum heat treatment excellent characteristics, the selection and formulation of coolant and cooling process is very important, changzhou vacuum heat treatment plant is generally adopted oil cooling and air cooling these two methods.

Oil cooling is a high performance price of a cooling method. Under the condition of vacuum, cooling capacity of cooling oil is lower than under normal atmospheric pressure, steam membrane thicker, this is mainly because the workpiece surface affect the cooling capacity of cooling oil, and continuous improvement of the vacuum quenching oil, makes the cooling strength with oil on the gas pressure drop and the lower level is much smaller than ordinary quenching oil. In addition, the cooling strength of the quenching oil can be adjusted by pressing into the gas to adjust the gas pressure on the oil surface. On the premise of ensuring the workpiece’s quenching, the lowest cooling speed can be used to reduce the stress and deformation of the workpiece.

Gas cooling can better maintain the good surface state of the vacuum-heated workpiece, reduce the space occupied by the liquid coolant (vacuum quenching oil) in the vacuum heat treatment equipment, and simplify the vacuum quenching operation process. The main consideration of true air quenching is its cooling rate, which is related to the type of gas, gas pressure, gas velocity and the structure of heating equipment.

Learn More: Vacuum Gas Quenching Furnace