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Characteristics of industrial vacuum atmosphere furnace
SOURCE:PROTECH(CHINA) HOLDINGS LIMITED Time£º2015-03-16 09:01
  (1) Strict vacuum sealed: public calendar is well known, the metal parts are vacuum heat treatment in a sealed vacuum furnace atmosphere, therefore, to obtain and maintain the original stove leak rate, to ensure working vacuum furnace vacuum atmosphere, for vacuum heat treatment to ensure the quality of the parts has a very important significance. So a key question vacuum heat treatment furnace, is to have a reliable vacuum seal structure. In order to ensure the performance of vacuum atmosphere vacuum furnace, vacuum heat treatment furnace structural design must follow a basic principle of road that is hermetically welded to the furnace to be used, but as little as possible or no openings in the furnace, less use of or avoided dynamic seal structure to minimize the chances of a vacuum leak. Such as water-cooled electrode attached to the vacuum atmosphere furnace parts, accessories, thermocouple deriving means also seal structure must be designed.     
(2) most of the heating and heat insulating material can only be used in a vacuum state: heating and vacuum heat insulation lining is working under vacuum and high temperature, these materials thus made high temperature, vapor pressure, radiation effects Well, thermal conductivity and other requirements. Performance requirements against oxidation. Therefore, vacuum heat treatment is widely used tantalum, tungsten, molybdenum and graphite for heating and heat-insulating structure material. These materials are easily oxidized in the atmosphere state, and therefore, these conventional heat treatment can not be used with heat insulating material.     
(3) water-cooling apparatus, a vacuum heat treatment furnace shell, the lid, the guide do not dispose of electric components (water-cooled electrode), an intermediate vacuum insulated door and other components, are working under vacuum, heated state. In this extremely unfavorable conditions of work, you must ensure that the structure of the various components of shape and not damaged, but the thermal vacuum seals, not burned. Therefore, each component cooling device should be set according to different situations, in order to ensure the normal operation of vacuum heat treatment and have enough life.     
(4) the use of low voltage and high current: in a vacuum vessel, really empty within a few degrees of care when a lxlo-1 Torr, energized conductor inside the vacuum vessel at higher voltages, will produce a light discharge phenomenon. In a vacuum atmosphere furnace will produce severe arcing, burning electric components, thermal insulation layer, resulting in a serious accident and loss. Therefore, the operating voltage vacuum atmosphere furnace heating elements, generally not more than 80 to 100 volts. While the heating element structure design should take effective measures, such as to avoid a sharp parts, the spacing between the electrodes can not be too narrow to prevent the glow discharge or arc discharge.
(5) a high degree of automation: the degree of automation of the reason why a high vacuum atmosphere furnace, because the metal parts of the heating and cooling operations, require a dozen or even several dozens action to complete. These actions inherent vacuum atmosphere furnace, the operator can not be close. At the same time, some actions, such as the end of the heat insulation, metal parts quenching processes shall be six, six movements and to be completed in less than 15 seconds. In such a condition to the completion of a number of rapid action, it is likely to cause tension operators constitute misuse. Therefore, only the higher purpose of automation to accurate, timely and coordinated action by the program. Welcome to http://www.lab-furnace.com

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