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Analysis of advantages and disadvantages of external vacuum heat treatment furnace

Time:2020-12-18 08:58 Click:
  What are the main advantages and disadvantages of the external vacuum heat treatment furnace? The following Zhengzhou Kejia Electric Furnace Co., Ltd. will share with you:
The advantages of external vacuum heat treatment furnace are mainly manifested in:
vacuum heat treatment furnace
1. Simple structure, easy to construct, or refit with the original ordinary heat treatment resistance furnace;
2. The volume of the vacuum chamber is small and the exhaust volume is small. In addition to the working parts, there are few other components in the furnace that need to be degassed, so the gas release is also small (no heat shield structure, etc.), and it is easy to achieve high vacuum;
3. Since the electric heating element is heated externally, there is no vacuum discharge problem;
4. The furnace has no more mechanical program actions, simple operation, fewer failures and convenient maintenance;
5. The workpiece of the high-temperature vacuum furnace is not in contact with the furnace lining, and there is no possibility of chemical action at high temperatures;
6. Compared with internal heating vacuum furnace, due to its simple structure, its cost is only 1/2-1/3 of internal heating vacuum furnace under the same loading capacity; it is more practical in terms of maintenance, service life and reliability. Sex.

But at the same time, there are still some defects in the external heating vacuum heat treatment furnace, which are mainly manifested in:
1. The heat transfer efficiency of the furnace is low, and the heating speed of the workpiece is slow;
2. Due to the limitation of the furnace pot material, the furnace working temperature is generally only maintained in the range below 1000-1000℃;
3. Part of the furnace tank is exposed to the atmosphere, although heat shields can be installed, but the heat loss is still large;
4. The heat capacity and thermal inertia of the furnace are large, and it is difficult to control;
5. The service life of the furnace tank is shorter.

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