Vacuum melting furnace: 七月 2016

2016年7月27日星期三

Induction furnace coreless induction melting furnace

Coreless furnace named is relative intentional furnace, the metal liquid in a crucible, therefore, also known as the crucible furnace. This type furnace is mainly used in special steel, cast iron, non-ferrous metal and its alloy melting and heat preservation. Coreless furnace has a high melting temperature, less impurity contamination, alloy composition uniformity, good working conditions and many other advantages. Compared with intentional furnace coreless furnace furnace and a change in metal varieties are more likely to use more flexible, but its power, is far less than intentional furnace thermal efficiency. Coreless furnace because of the low surface temperature, slag formation of high temperature melting.
Coreless furnace with high frequency, intermediate frequency and power frequency.
(1) high frequency coreless furnace
High frequency coreless furnace capacity generally under 50 kg, suitable for laboratory and small scale production for smelting special steel and special alloy.
(2) the medium frequency coreless furnace
The capacity and power of the medium frequency coreless furnace are bigger than high frequency furnace. Mainly used in special steel, such as magnetic alloy and copper alloy melting. The furnace due to the need for expensive frequency conversion equipment, so in some large capacity situation has changed labor frequency coreless furnace. However, compared with power frequency furnace, intermediate frequency furnace also has its unique feature. As for the same capacity of the furnace, intermediate frequency furnace input power is greater than power frequency furnace, so the melting speed is faster, intermediate frequency furnace in cold furnace melting block, do not need a furnace on liquid metal can be poured out, so than when using flexible power frequency furnace; In addition, medium frequency melting furnace crucible lighter scouring solution, good for lining. Therefore, in the development of the high power of intermediate frequency power supply cheap, intermediate frequency furnace is promising.

2016年7月22日星期五

The induction heating characteristics of induction melting furnace

Induction heating technology is fast, clean, energy-saving and easy to realize automation and online production, high production efficiency, etc, is an internal heat source, is a non-contact heating mode, can provide high power density, when there is a high degree of heating surface and the depth of the selectivity of flexible, can work in all kinds of carrier gas (air, gas, vacuum), the loss is extremely low, does not produce any physical pollution, accord with environmental protection and sustainable development policy, is one of the green environmental protection heating process. It less with the controlled atmosphere heat treatment, vacuum heat treatment without oxidation technology has become the mainstream of the heat treatment technology development.
The main applications of induction melting furnace are:
(1) metallurgy of non-ferrous metal smelting, heat treatment of metal material, forging, extrusion, rolling and other profiles production diathermy, welding seam of welded pipe production.
(2) mechanical manufacture all kinds of mechanical parts quenching, quenching and tempering, annealing and normalizing heat treatment, such as heating; Pressure diathermy before processing.
(3) sealing of canned light industry and other packaging, such as the name of tetra brick of sealing.
(4) electronic tube vacuum deaeration heating.
(5) special applications Such as plasma, welding, etc.

2016年7月19日星期二

Vacuum melting furnace structure characteristics

Vacuum furnace is an induction coil, by manual rotation handle outside the furnace can be easily within the crucible melting liquid poured into the mold, mold can be designed to be cooled. Upper crucible is equipped with a temperature measuring device. By secondary pump, vacuum system, K - 300 oil diffusion pump and 2 x - 70 mechanical pump, mechanical pump is equipped with electromagnetic relief valve on the return oil after avoid blackouts. With bleed valve and charging valve on the vacuum unit.
This product by the furnace cover vacuum melting furnace structure, furnace, furnace bottom, crucible, vacuum system of slewing mechanism and intermediate frequency power supply control system, etc.
Furnace cover, furnace, furnace bottom adopts double water cooling structure, keep the temperature of the bof shell is not more than 60 ℃. Furnace cover opened the way for manual and the furnace cover with observation holes and damper, to facilitate adding alloying elements to the process of melting, furnace cover on AD hoc alloy feeder. Furnace is an induction coil, by manual rotation handle outside the furnace can be easily within the crucible melting liquid poured into the mold, mold can be designed to be cooled. Upper crucible is equipped with a temperature measuring device.
By secondary pump, vacuum system, K - 300 oil diffusion pump and 2 x - 70 mechanical pump, mechanical pump is equipped with electromagnetic relief valve on the return oil after avoid blackouts. With bleed valve and charging valve on the vacuum unit.
Medium frequency power supply can choose KGPS SCR or IGBT integration power supply, digital circuit, such as electrical system with over-current, over-voltage feedback and protection circuit.

2016年7月15日星期五

Aluminium scrap melting equipment - induction melting furnace

Common induction melting furnace, the core and has two kinds of core, the advantage of this furnace is:
(1) breathe in less and less oxidation burning loss, general metal aluminum burning only around 0.5%. Raw material broken hours is not 1%, up to 5% for aluminium scrap.
With a strong magnetic field lines (2) when the melt mixing, uniform composition, melting fast, very favorable for broken material.
(3) the unit power consumption is little, high thermal efficiency. In general, power consumption is 380 ~ 450 KWH/tons, thermal efficiency can reach 70%. Resistance furnace is corresponding to 430 ~ 600 KWH/t and 50%.
(4) covers an area of less, good operating environment
Defect is melting channel type induction furnace to replace the aluminum melting trench must be clear, when the species difficult. Followed by melting trench polluted by molten aluminum washout flake refractory in the melt.

2016年7月11日星期一

What is the working principle of high frequency induction melting furnace?

High frequency induction melting furnace main working principle: the high frequency of high frequency large current flows to be made around the circular or other shape of the heating coil (usually with copper control). Thus produce polarity in the coil and the instant change of strong magnetic bundle, such as the metal is heated objects placed in a coil, a magnetic beam will through the whole heated objects, in the interior of the heated object and heating current in the opposite direction, will produce relatively large eddy current. There is resistance because of the heated object, it will produce a lot of joule heat, the temperature of the object itself rapidly rising. To achieve the purpose of to all metal material heat.

2016年7月5日星期二

The overall structure of vacuum furnace

Vacuum tempering furnaceThe body consists of two parts; The upper part of the vacuum chamber (negative pressure steam room), hold the space tubular steam-water heat exchangers, used to heat flow through the circulating water heat exchanger. Operating principle: the vacuum hot water boiler is running, under vacuum negative pressure furnace absorbed heat medium water inside the fuel combustion heat release, boiling vaporization for low temperature steam, low temperature steam rising in stainless steel heat exchanger in circulating water system, circulating water heating for the user or sanitary hot water for heating.
Itself is cooled water vapor condenses into water droplets fall to the heat medium water again after heated, so as to complete the whole cycle. So it is the working principle of the interior of the vacuum furnace. HTM constantly in an enclosed body = = = = evaporation condensation = = "boiling heat medium water" in the loop, so don't need to supplement the condensed water, also do not have empty the risk of burning. Vacuum hot water boiler using soda condensation heat transfer, in all working condition of heat transfer, soda, condensation heat transfer coefficient of heat transfer is the highest.