Do you really know what a vacuum furnace is?
Most heating and insulation material can only be used in the vacuum state: Canon empty heat treatment furnace heating and insulation lining is working under vacuum and high temperature, thus put forward for these materials a resistance to high temperature, low steam, radiation effect is good, the requirement of small coefficient of thermal conductivity, oxidation performance requirements is not high, so the standard air heat treatment furnace, platinum, tungsten and graphite etc widely adopted for heating and heat insulation structure material, this material under the atmospheric conditions are rail, therefore, the conventional heat treatment furnace is can't use this heating and insulation materials.
With low voltage high current, vacuum container, vacuum container of electric conductor under high voltage and produce glow discharge phenomenon, in a vacuum heat treatment furnace, serious can produce arc discharge, burning electric heating element, insulation, etc., cause serious accident and report it as a result, the working voltage of electric heating element of the vacuum heat treatment furnace, generally not more than 80-100 volts, in electric son structure design at the same time to take effective measures, such as do most avoid is sophisticated components, the spacing between the electrode cannot be too narrow to preventing the occurrence of glow discharge and arc discharge.
Water-cooling device, vacuum heat treatment furnace, furnace shell, furnace cover, electric heating element, respectively disposal (water-cooled electrodes), middle vacuum hot insulation parts, both in the condition of vacuum, heating work, work under the condition of this kind of disadvantage, must ensure that all parts of the structure of small deformation, damage, the empty qian seal without overheating and burning, as a result, the parts should be set according to different situations water-cooling device, in order to ensure the normal operation of vacuum heat treatment furnace can and have enough life.
The structure of vacuum furnace, heating process, temperature control and atmosphere inside the furnace will directly affect the quality of the processed products. In the forging furnace, increasing the heating temperature of the metal can reduce the deformation resistance, but too high temperature will cause grain growth, oxidation or overfiring, which will seriously affect the quality of the workpiece. During heat treatment, if the steel is heated to a point above the critical temperature and then suddenly cooled, the hardness and strength of the steel can be increased. If it is heated to a point below the critical temperature and then cooled slowly, the hardness of the steel decreases and the toughness increases.