Function and operation protection of heat treatment in vacuum annealing furnace

(1) Most of the heating and heat insulation materials can only be used in the vacuum state: the heating and heat insulation lining materials of the vacuum heat treatment furnace are operated in the vacuum and high temperature, so the requirements of the vacuum annealing furnace for these materials are put forward, such as high temperature resistance, low steam pressure, good radiation effect, small thermal conductivity and so on. The requirement of antioxidant function is not high. Therefore, tantalum, tungsten, molybdenum and graphite are widely used as heating and insulation materials in vacuum annealing furnace. These data are easy to oxidize in the atmosphere, so the conventional heat treatment furnace can not use these heating and insulation data.

(2) Water cooling equipment, furnace shell and cover of vacuum heat treatment furnace, electric heating elements, all hydrogen bell type annealing furnace guide disposal (water-cooled electrode), central vacuum separator and other parts are operated under vacuum and heating conditions. Under such extremely unfavorable conditions, it is necessary to ensure that the structure of each part is not deformed or damaged, and that the vacuum sealing ring is not overheated or burned. Therefore, water cooling equipment should be set up according to different conditions to ensure that the vacuum heat treatment furnace can operate normally and have enough service life.

(3) Choose low voltage and high current: in the vacuum vessel, when the actual vacancy is within the range of several torr-ixio-1 Torr, the electrified conductor in the vacuum vessel will have glow discharge under high voltage. In the vacuum heat treatment furnace, serious arc discharge will occur, burning heating elements, insulation layer, etc., resulting in major accidents and loss. Therefore, the operating voltage of the electric heating element of the vacuum heat treatment furnace is usually less than 80-100 v. Some useful methods should be adopted in the structural design of electric heating elements, such as avoiding sharp parts as far as possible, and the distance between electrodes should not be too narrow, so as to avoid the occurrence of glow discharge or arc discharge. Annealing furnace price

(4) High degree of automation: the reason for the high degree of automation of vacuum heat treatment furnace is that the heating, cooling and other operations of metal workpiece need more than ten or even dozens of actions to complete. These actions are carried out in the vacuum heat treatment furnace, and the operator cannot get close to them. For example, after heating and heat preservation, the quenching process of metal workpiece needs six or six actions, which should be completed within 15 seconds. It's very simple to finish many actions under such agile conditions, which results in serious misoperation of operators. Therefore, as long as the goal of a high degree of automation in order to accurately and timely coordination set according to the program.