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Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Solution Treatment of Alloy, Vacuum Tempering and Recrystallization of Non-ferrous Metals

Vacuum tempering furnace is mainly used for vacuum tempering of tool steel, die steel, high-speed steel, ultra-high-strength steel, titanium alloy and other materials after vacuum quenching, solution treatment, recrystallization annealing and vacuum aging of non-ferrous metals. So what should be paid attention to during the heating process of vacuum tempering furnace?

1. Avoid Contact Between Heat-treated Products and Electric Heating Elements

In particular, if copper, aluminum, zinc, tin, lead, etc. come into contact with electric heating elements, no matter it is fine powder, molten liquid or steam, etc., it prevents corrosion and formation of “pits” on the surface of the electric heating body, reducing the cross section and finally overheating and burning off.

2. Positioning and Binding Method of Temperature Measuring Contacts

When testing the furnace temperature uniformity, attention should be paid to the positioning and binding method of the temperature measuring contact and the distance from the heating element.

Frequently (at least monthly) use brushes, brooms or compressed air, vacuum cleaners, etc. to clean the furnace and the bricks to prevent impurities such as oxide scale in the furnace from falling on the heating elements, causing short circuits, or even burning the bricks. The bottom plate, crucible, furnace pot and other heat-resistant steel components should be lifted and knocked every time they are used for a period of time to remove their oxide scale. If impurities such as iron oxide scale are not removed in time, they will melt and react with the refractory bricks, causing the furnace wire to melt.

3. Cut off the Control Power Supply in Time

Pit-type tempering furnace structure, the outer shell is made of steel plate and section steel into a cylindrical furnace body. The inner surface of the furnace cover is made of stainless steel plate. The furnace lining is made of ultra-lightweight 0.6g/cm3 energy-saving microporous refractory insulation bricks. Aluminium silicate fiber felt is placed between the furnace lining and the furnace shell for heat preservation, and the gap is filled with expansion heat preservation powder. The resistance wire adopts 0Cr25Al5 high-resistance alloy wire to be spirally wound and installed on the wire brick in the furnace. A stainless steel charging basket is placed in the furnace. The furnace cover is raised and lowered by manual lever. In order to heat the workpiece uniformly, a hot air circulation fan made of heat-resistant stainless steel shaft and blades is installed on the furnace cover. During the heating process of the workpiece, the hot air circulates up and down in the tempering furnace to ensure that the workpiece is evenly heated. In order to ensure safe operation, a limit switch is installed near the lifting mechanism. This switch is interlocked with the power supply of the tempering furnace control cabinet, and the power is turned on when the furnace cover is closed (when working). When the furnace cover is opened, the limit switch cuts off the control power supply, so the power supply of the heating element is cut off at the same time to ensure safe operation.

4. Strict Vacuum Sealing

As we all know, the vacuum heat treatment of metal parts is carried out in a closed vacuum furnace. Therefore, obtaining and maintaining the original leakage rate of the furnace and ensuring the working vacuum of the vacuum furnace are of great significance to ensuring the quality of the vacuum heat treatment of the parts. Therefore, a key problem of the vacuum heat treatment furnace is to have a reliable vacuum sealing structure. In order to ensure the vacuum performance of the vacuum furnace, a basic principle must be followed in the structural design of the vacuum heat treatment furnace, that is, the furnace body should be airtightly welded, and at the same time, the furnace body should be opened or not opened as much as possible, and the use of dynamic sealing should be avoided or avoided. Structure to minimize the chance of vacuum leakage. The parts and accessories installed on the vacuum furnace body, such as water-cooled electrodes and thermocouple lead-out devices, must also be designed with a sealed structure.