Induction furnace smelting technology

Induction furnace smelting technology

The first intermediate frequency induction furnace were completed and put into operation in our country, has been 69 years of history. Since 69, the special steel industry in China under the joint efforts of several generations was a great development, and promote the development of steelmaking process and technology. Special smelting has become an important part of the special steel production in China, induction furnace smelting is its main branches.
The development of special steel, special alloy varieties, to promote the progress of metallurgical technology. Metallurgical technology is in solving the metal materials in the development of technical challenges, just got rapid progress. For example: the invention of the ultra-low carbon stainless steel, promoted the argon oxygen decarburization (AOD) stainless steel smelting and vacuum oxygen decarbonization (VOD) technology development; The emergence of high temperature alloy complex alloying technology and promoting the vacuum induction furnace, vacuum arc remelting, etc. The development of the technology. A lot of the fact that the metallurgy and metal materials disciplines have close interdependence between, the relationship between interrelated, mutual penetration.

Electric capacitor failure analysis of medium frequency induction furnace

Electric capacitor failure analysis of medium frequency induction furnace

1. Induction furnace the capacitance internal spark: the machine is running, there was a noise inside, is the insulation breakdown, should follow change new one.
2. The capacitance external lighter: the machine is running, the external flint, capacitor shell is not good for ground insulation series or parallel booster series capacitors are connected to the parallel capacitor shell.
3. The cooling water can result in heat insulation damage, should be timely treatment. The insulation of the electric capacitor check the insulation resistance of the condenser is divided into the poles, the multistage electrical insulation between the group and the poles of the insulation resistance of the shell due to its capacitance is composed of capacitor in series, in parallel components, the insulation of the individual components degradation will not reduce insulation resistance of the capacitor, so remote sensing electrode insulation resistance may be difficult to find defects. So don't usually do this test, and only do the poles or multistage insulation resistance measurement of the shell. According to the rated voltage with different number of shaking table. Now rated voltage 750 v, for example, use 1000 v shake table, should be taken before shake side will capacitor discharge. Roll side, should first will shake table to the specified speed, after waiting for its smooth pointer, the poles of the shaking table pick to capacitor, continue to turn shake table. Beginning, because of capacitor charging, pointer will decline, then slowly rises until stable, at this time of reading very capacitor electrode resistance, usually 1000 v is not less than 1 megohm. Read number again later, should first will shake table line, is to stop shaking. Otherwise, easy to burn out because of the capacitor discharge header. After telemetering, capacitor discharge, should be to avoid electric shock.

Vacuum induction melting furnace structure Introduction

Vacuum induction melting furnace structure Introduction

Melting furnace structure, introduction of a complete set of melting furnace furnace equipment consists of intermediate frequency power supply cabinet, compensation capacitance, furnace (two) and water-cooling cable, reducer. Shell, induction coil, furnace lining, furnace body by tilting furnace reducer of four parts, such as furnace shell made of non-magnetic materials, induction coil is made up of rectangular hollow tube spiral shell, melting when the cooling water pipe. Coil which leads to the copper platoon and water-cooling cable connected, induction coil, furnace lining close to, composed of quartz sand play solid sintering, tilting furnace by tilting furnace reducer rotate directly. Tilting furnace is a secondary turbine speed reducer, self-locking performance is good, stable and reliable, emergency power when the tilting furnace work, to avoid danger. Can choose furnace switch of two furnace tilting furnace reducer motor control options, with four core rubber-sheathed wire switch box enables the operator to stand in the right position of the furnace body tilting, inching control reset.
Is generally more than 3 tons of melting furnace has not adopt the institutions, tilting vacuum furnace is given priority to with the hydraulic oil cylinder, induction copper outer circle several uniform imitation arc magnetic yoke, prevent leakage. Using this method, the furnace shell does not need to use nonmagnetic materials, furnace shell outside is not hot. Using hydraulic tilting furnace equipment gently tilting furnace process, safety.

Induction furnace coreless induction melting furnace

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.

The induction heating characteristics of induction melting furnace

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.

Vacuum melting furnace structure characteristics

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.

Aluminium scrap melting equipment - induction melting furnace

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.