vacuum hardening furnace

In the vacuum heat treatment equipment category, vacuum hardening furnace is the most widely and representative typical equipment. It has the following characteristics:

1.strictly vacuum sealing it is well known that vacuum heat treatment heating and quenching workpiece were conducted in airtight vacuum furnace, so ensure vacuum degree of vacuum quenching furnace, and to ensure the quality of the parts of the vacuum heat treatment has very important significance. In order to ensure the vacuum performance of vacuum furnace, the furnace must be air-tight welding, with few holes in it, so as to minimize the chance of vacuum leakage. The parts and accessories that are installed on the vacuum furnace, such as the water-cooled electrode and the thermocouple export device, are also sealed.

2.most heating and insulation material can only be used in the vacuum state of vacuum quenching furnace heating and insulation lining is working under vacuum and high temperature, these materials have high temperature resistant, low steam, radiation effect is good, low coefficient of thermal conductivity, etc. Such as domestic existing vacuum quenching furnace mainly adopts graphite heating and heat insulation structure material, it is heated extremely easy oxidation under atmospheric conditions, therefore, conventional heat treatment furnace can not use these heating and insulation materials.

3.vacuum heat treatment furnace shell, furnace cover, electric heating element (water-cooled electrode), middle vacuum insulation, etc., all work under vacuum and heating condition. In this extremely unfavorable condition work, must ensure the structure of each component is not deformed, do not damage, vacuum sealing ring is not too hot, do not burn. Therefore, the components are equipped with water cooling devices according to different circumstances to ensure that the vacuum furnace can operate normally and have sufficient service life.

4. Low voltage and high current is applied to the workpiece
In the vacuum heat treatment furnace, when the vacuum degree to a few hundred mpa (Pa), electric conductor under high voltage, can produce glow discharge phenomenon, serious can produce arc discharge, burning electric heating element, insulation, etc., cause serious accident and loss. Therefore, the working voltage of the vacuum heat treatment furnace is generally not more than 80 to 100 volts. At the same time, the electric heating element avoids the cutting edge of the components, and the space between the electrodes should not be too narrow to prevent the glow discharge or arc discharge.

5.The degree of automation is high because of the heating and cooling of metal workpieces. It takes a dozen or even dozens of actions to complete. These actions are carried out in a vacuum heat treatment furnace, which the operator can’t access. At the same time, some actions, such as the completion of heating and thermal insulation, must be completed in a short time. In such a rapid condition to complete many actions, it is very easy to cause the operator’s tension to constitute a misoperation. Therefore, most vacuum hardening furnace are controlled by high automation procedures.