The metal parts of quenching furnace are all in closed vacuum after vacuum heat treatment

(1) Strict vacuum sealing: it is well known that the vacuum heat treatment of metal parts is carried out in a closed vacuum furnace. Therefore, it is of great significance to obtain maintain the original air leakage rate of the furnace ensure the working vacuum of the vacuum furnace, so as to ensure the quality of vacuum heat treatment of parts. So a key problem of 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 adopt airtight welding, at the same time, the furnace body should be opened as much as possible, the dynamic sealing structure should be used avoided as much as possible to reduce the chance of air leakage. The components accessories installed on the vacuum furnace body, such as water-cooled electrode thermocouple lead-out device, must also be designed with sealing structure.

(2) Most of the heating insulation materials of quenching furnace can only be used in vacuum state: the heating insulation linings of vacuum heat treatment furnace work in vacuum high temperature, so the requirements of high temperature resistance, low steam pressure, good radiation effect small thermal conductivity are put forward for these materials. The requirement of oxidation resistance is high. Therefore, tantalum, tungsten, molybdenum graphite are widely used as heating insulation materials in vacuum heat treatment furnace. These materials are very easy to oxidize in the atmospheric state, so they can be used in conventional heat treatment furnace.

(3) Water cooling device, shell, cover, electric heating element guiding treatment (water-cooling electrode), middle vacuum insulation door other components of vacuum heat treatment furnace all work under vacuum heating conditions. In this extremely unfavorable condition, it is necessary to ensure that the structure of each component is deformed damaged, the vacuum sealing ring is overheated burnt. Therefore, each component should be equipped with water-cooling device according to different conditions to ensure the normal operation sufficient service life of the vacuum heat treatment furnace.

(4) Using low voltage high current: in the vacuum vessel, when the vacuum degree is within the range of several torrs one lxlo-1 Torr, the electrified conductor in the vacuum vessel will produce glow discharge under high voltage. In the vacuum heat treatment furnace, serious arc discharge will be produced, the electric heating elements heat insulation layer will be burned, which will cause major accidents losses. Therefore, the working voltage of the electric heating elements of the vacuum heat treatment furnace of the quenching furnace is generally no more than 80-100 v. At the same time, effective measures should be taken in the structural design of electric heating elements, such as avoiding the parts with tips as far as possible, the spacing between electrodes should be too narrow, so as to prevent the occurrence of glow discharge arc discharge.

(5) High degree of automation: the reason why the vacuum heat treatment furnace has a high degree of automation is that the heating, cooling other operations of metal workpieces need dozens even dozens of actions to complete. These actions are carried out in the vacuum heat treatment furnace, which is inaccessible to the operators. At the same time, some actions, such as heating heat preservation, require six six actions to complete the quenching process of metal workpiece within 15 seconds. In such a rapid condition to complete many actions, it is easy to cause the operator's tension constitute misoperation. Therefore, only a high level of targeting can coordinate the transfer accurately timely according to the procedures.

The above is the multi-purpose furnace production line to introduce the relevant content, I hope to help you.