What is the reason for insufficient vacuum degree in the vacuum annealing furnace?

The reasons for insufficient vacuum degree in vacuum annealing furnaces may involve multiple aspects, mainly including the following:
1. Vacuum system issues
Vacuum pump failure: The vacuum pump is a key equipment for maintaining the vacuum degree inside the furnace. If the vacuum pump fails, such as pump body leakage, insufficient or contaminated pump oil, or wear of pump components, it will cause a decrease in its pumping capacity, thereby affecting the vacuum degree.
Solution: Check the operation of the vacuum pump, including pump oil volume, pump oil quality, pump body sealing, etc. Clean or replace damaged components in a timely manner, and regularly maintain the vacuum pump.
Aging or damage of vacuum seals: Seals such as flange gaskets and valve sealing surfaces of vacuum annealing furnaces are prone to aging or damage under long-term high temperature and mechanical action, leading to air leakage and affecting the vacuum degree.
Solution: Regularly check the condition of the seals, replace any aging or damaged seals in a timely manner, and ensure that the replaced seals are installed correctly and sealed properly.
Vacuum pipeline blockage: There may be impurities, deposits, and other blockages in the vacuum pipeline, which can cause poor airflow and affect the improvement of vacuum degree.
Solution: Clean the blockages in the vacuum pipeline and keep it unobstructed.
2. Heating system issues
Heating element aging or damage: The heating element is an important component of the vacuum annealing furnace. If the heating element ages or is damaged, it may cause uneven heating or insufficient heating capacity, thereby affecting the elimination of the atmosphere inside the furnace and the improvement of the vacuum degree.
Solution: Check the connection and resistance value of the heating element. If aging or damaged heating elements are found, they should be replaced in a timely manner.
3. Control system issues
Temperature control system malfunction: The temperature control system is an important device for controlling the heating temperature and vacuum degree of the vacuum annealing furnace. If the temperature control system malfunctions, such as sensor failure, controller failure, etc., it may lead to inaccurate temperature control or vacuum degree control failure.
Solution: Check the working condition of the temperature control system’s sensors and controllers, and promptly repair or replace any faults found.
4. Other factors
Unstable power supply: Fluctuations or instability in the power supply may cause a decrease in the performance of equipment such as vacuum pumps and heating elements, thereby affecting the improvement of vacuum degree.
Solution: Check the stability of the power supply, ensure that the power supply voltage and frequency meet the requirements, and take corresponding voltage stabilization measures.
Residual atmosphere in the furnace: If there is a large amount of residual atmosphere in the furnace, such as air, water vapor, etc., it will affect the improvement of vacuum degree.
Solution: Fully exhaust before heating to ensure that the atmosphere inside the furnace is minimized as much as possible.
In summary, the reasons for insufficient vacuum degree in vacuum annealing furnaces may involve multiple aspects such as vacuum system, heating system, control system, etc. In practical operation, it should be checked and handled one by one according to the specific situation to ensure the normal operation and efficient work of the vacuum annealing furnace.