Vacuum Induction Melting Furnace

2017年1月9日星期一

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.

2017年1月3日星期二

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.

2016年12月30日星期五

Explanation using the intermediate frequency furnace technical specification for you

My company main circuit adopts expert explains to the intermediate frequency furnace device "ac - dc - ac transformation system by three-phase fully-controlled bridge rectifier circuit, inductance, wave circuit of inverter circuit in parallel, on the basis of the following:
(a), rated input devices: three-phase alternating current (ac), frequency of 50 hz (60 hz), line voltage is 380 v (high pressure equipment is 660 v, 750 v, 950 v, 1050 v, 1250 v, 1450 v, etc)
(2), equipment rated output: as shown in chart a; Under the rated voltage or rated load, the output power can be smooth, continuous adjustment, the adjustment range is 5% - 100% of the rated power;
(3), can prevent overvoltage switching operation (such as QF open and close, the RS fuse, etc.);
(4) when the output voltage 1.1 1.2 times better than the maximum output voltage or over voltage setting value, the overvoltage protection system action, make the device automatically stop working, and send out alarm signal, over voltage indicator light meter box;
(5) when the inverter bridge through short circuit protection system action immediately, make the automatic stop device, had concurrent flow indicator - flow indicator light meter box;
(6) as the output current more than setting value, the protection system also make the automatic stop device, had concurrent flow indicator - flow indicator light meter box;
(7) the water-cooling system working pressure is lower than a certain value, the function of automatic stop, and light up the water indicator on the panel;
(8) the machine set a limited flow, pressure limiting link, make the input current and output voltage limit within the set value.

2016年12月28日星期三

Induction melting furnace operation points and maintenance

The induction melting furnace maintenance and maintenance
1. The furnace body, instrument and control cabinet should be always kept clean.
2. The fire inflammable and explosive articles shall be stored in 2 m around.
3. The surface of the furnace shell paint should remain intact, besmear to brush on a regular basis.
4. The temperature higher than 400. 12, not for a long time to open the oven door.
5. Use the furnace temperature shall not exceed the maximum rated temperature.
6. Regular repair and improve the front seal measures.
7. To lubrication of mechanical transmission parts regularly.
8. Regularly check whether the graphite heater terminal clamp, and tighten.
9. The corrosive substance and moisture artifacts must not be into the furnace heating.
10. Graphite heater once connected to each other, there should be timely when the power is separated.
11. Regularly clean up furnace bottom residual scale and other impurities.
Of the maintenance of the induction melting furnace
Induction melting furnace heating power after school with furnace using the extension of time, the thermal resistance of heat insulation screen to smaller, volatilize electric heating element and resistance is larger, the influence of such factors as power should be appropriately increased. In production practice, with experience and determine the power calculation method as shown in figure 4, 15 for the graphite felt or refractory fiber felt heat insulation screen vacuum furnace volume and heating power relationship graph. According to the figure 1300 can be determined. The vacuum furnace heating power of the C. If metal heat insulation screen vacuum furnace, was to check the heating power of the need to increase by about 30%.
Heat insulation screen maintenance screen in vacuum furnace and heat insulation, heat preservation effect, sometimes as a fixed structure foundation of heater. Heat insulation screen structure in general there are four types: full metal heat insulation screen, mezzanine type screen, graphite felt heat insulation screen and mixed felt heat insulation screen. Different heat insulation screen, should grasp the key points in maintenance.

2016年12月23日星期五

Intermediate frequency furnace steelmaking has the following advantages

1 simple, intermediate frequency furnace equipment. Compared with electric arc furnace, intermediate frequency furnace itself does not need large furnace equipment, don't need a large furnace equipment (such as hydraulic pressure, rotating mechanism, etc.), also don't require a lot of water cooling system, so its monomer equipment investment is relatively low, the equipment is simple and easy to master.
2, only has the function of the steel because of intermediate frequency furnace, no oxygen blowing in steelmaking process, so don't oxygen generator and other large equipment, it can also save money.
3, due to the small size, medium frequency furnace height is low, so the factory also was much lower than other steelmaking workshop, therefore, its cost in the factory building construction is also less than other types of steelmaking plant.
4, small and intermediate frequency furnace capacity, production arrangement is more flexible, especially suitable for small single piece casting production.
5, in addition, power frequency furnace and its related technology level is low, short-term easy to grasp.
6, the most low-end products in the market demand is not high, intermediate frequency furnace comprehensive cost is lower than other steelmaking process.

2016年12月19日星期一

The principle of vacuum furnace and structure

Vacuum furnace is mainly composed of furnace, smoke tube, heating coil and a chimney. Using the negative pressure of steam heat exchange technology, the runtime will be used as heat medium of the liquid level control between the smoke and fire tube and the heating coil, the pressure in the furnace is made by high temperature exhaust gas pressure, operation and control the negative pressure condition. Full combustion of fuel burner, heating tube and the fire heat pipe is passed to the pot shell intermediate medium water, boiling water is heated by the liquid into gas phase evaporation, water vapor gradually filled with gas phase space of the furnace body, because the coil is the heating medium and the tube wall temperature is lower than the steam temperature, so that the vapor in the outside wall of the condensing coil, and the heat transfer medium to coil. After the condensation water in gravity whereabouts backwater space. Cycling heat process was realized. To take the negative pressure of heating furnace operations, mainly considering the security issue, the normal pressure will cause the high temperature furnace flue gas leakage, heat loss increase, not only will cause the destruction of the stove itself and the harm to personal safety.

2016年12月15日星期四

Vacuum induction melting furnace using the matters needing attention

For induction melting operation must be careful and cautious when, in the process of operation should be more pay attention to personal safety, at the same time providing protection equipment as well.
During vacuum induction melting operation part, should be carried out in accordance with the relevant operation process, if not in accordance with the operating rules, is easy to vacuum pump body is damaged, resulting in a serious accident, will not only harm health, life and damage to equipment will also have a certain role.
In smelting operation, should beware of electric shock, such as electrode, rotating electrode copper wires, copper power supply box with a certain capacity, so be sure to properly insulating protection, so it can avoid electric shock. At the same time also need to protect good eye, if the temperature is too high, need to cover the observation hole of the baffle, if is necessary, you will need to wear sunglasses.
In the smelting, attention should be paid to keep a good environment, pay attention to ventilation, need the mechanical pump out of the trachea leads to the outside of the window. To dry the floor at the same time also need, there is no water. In the whole process of smelting, shall guarantee the circulating water can be a normal cycle.

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