Medium frequency induction melting furnace work on what principle

Medium frequency induction melting furnace work on what principle

How medium frequency induction melting furnace works, what is the principle of intermediate frequency induction melting furnace, the following is to introduce: medium frequency induction melting furnace is a kind of will power frequency 50 HZ alternating current into intermediate frequency (above 300 HZ and 20 k HZ) power supply device, the three-phase alternating current (ac) power frequency, after rectification into direct current, then laid adjustable intermediate frequency electric current, direct current supply by capacitance and induction coil in through the intermediate frequency alternating current, generate high density magnetic field lines in the induction coil, induction coil, and cutting in cheng fang of metal materials, produce a lot of eddy current in the metal materials.
The vortex also has some properties of intermediate frequency electric current, i.e., the metal itself free electrons in the resistance of the metal body flow to generate heat. , for example, put a metal cylinder has alternating medium frequency current in induction coil, metal cylinder has no direct contact with induction coil, electric coil temperature is very low, but the surfaces are heated to redness, and even melt, and the redness and melting speed as long as adjust the size and the strength of the current frequency can be achieved. If the cylinder on the coil center, surrounding the cylinder temperature is the same, the cylinder heating and melting did not produce harmful gases, light environmental pollution.

The structure characteristics of the vacuum furnace

      The structure characteristics of the vacuum furnace

The structure characteristics of the vacuum furnace mainly includes:
(1) strictly vacuum seal. Metal products for sintering or heat treatment are conducted in airtight vacuum furnace, so the furnace to obtain and maintain the original air leakage rate, ensure vacuum degree of vacuum furnace, and to ensure the quality of the products have very important significance. To ensure the vacuum performance of vacuum furnace, in vacuum furnace design must follow the basic principle is: furnace should use airtight welding; Opening or less as far as possible on the furnace body is not opening; Less use or avoid use dynamic seal structure to minimize the vacuum leak; Installed on the furnace accessories, such as water-cooled electrodes, thermocouple device must be designed sealing structure is deduced.
(2) heating and insulation material can only be used in the vacuum state. Vacuum resistance furnace heating and insulation work under high temperature and vacuum, resistance to high temperature, low steam are put forward for the material, radiation effect is good, and the requirements of small coefficient of thermal conductivity, the hangzhou oxidizing request is not high. Vacuum resistance furnace is widely used tungsten, aluminum, tantalum, and heating and thermal insulation materials such as graphite, and the material under the atmospheric conditions extremely easy oxidation, generally do not use them as regular resistance furnace heating material.
(3) the cooling unit. Vacuum furnace, furnace shell, furnace cover, electric heating element guiding device (water-cooled electrodes), middle vacuum hot insulation parts are in the condition of vacuum, heating work, in order to guarantee the structure deformation of parts, vacuum sealing ring heat, not burning, not all the parts should be set according to different situations water-cooling device, in order to ensure the normal operation of the furnace and have enough life.
(4) with low voltage, high current. When the vacuum degree within the scope of 0.1 a IO0Pa, under the high voltage electric conductor can produce glow discharge phenomenon, serious can produce arc discharge that burned electric heating element, insulation, etc. As a result, the working voltage of vacuum furnace electric heating element is generally not more than 80-100 - v. At the same time, the electric heating element structure design to take some effective measures, such as to avoid a cutting-edge parts, electrode spacing cannot be too small.
(5) requires a high degree of automatic.

The principle of induction melting furnace

The principle of induction melting furnace

Using SCR ac induction melting furnace control system, digital dc power conversion theory of relay control, high reliability and high working frequency interference, automatic tracking, workflow function without manual intervention, automatic matching load and power supply. Due to the over current, over voltage, lack of phase, water pressure protection, allowing any failure equipment operation will not damage components, reduce the use and maintenance of the equipment.
Heat penetration, melting, brazing, such as the support used single crystal, heat treatment and sintering,. Feedback system can increase the temperature, the temperature of the closed loop automatic control system: increase the attached machine separation temperature, in order to achieve just send fake eligible workpiece temperature, in addition, the special interface of PLC or accept "interface", industrial control and heating system, realizes the intelligent control and intelligent temperature precise execution of smelting temperature control instrument control coupling.