Products Thermal Equipment Vacuum Furnace Vacuum induction melting furnace Arc Melting Furnace
Vacuum induction melting furnace Arc Melting Furnace

Vacuum Furnace

Vacuum induction melting furnace Arc Melting Furnace

Item Number : KT-VI

Price varies based on specs and customizations


Temperature
1700 ℃
Vacuum
6x10-3 Pa
Capacity
5-500 kg
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Introduction

The Vacuum Induction Melting Furnace is a specialized equipment designed for melting metals under vacuum conditions, utilizing a water-cooled induction coil and refractory lining. It is crucial for casting aircraft components and refining high purity metals, operating at temperatures up to 2000℃ with features like tilt and pour mechanisms, casting chambers, and sampling ports.

Applications

The Vacuum Induction Melting Furnace is a specialized equipment used for melting and casting metals under vacuum conditions, primarily utilizing medium-frequency induction heating. This technology is crucial in various high-tech industries due to its ability to produce high-purity metals and alloys with precise control over the melting environment. Key applications include:

  • Aerospace components casting
  • Manufacturing of complex valves for extreme conditions
  • Refining high-purity metals and alloys
  • Production of electrodes for remelting
  • Nickel and special steel production
  • Precision alloy fabrication
  • Active metal processing
  • High-temperature alloy development
  • Magnet material creation

Detail & Parts

Furnace StructureFurnace Structure (1. Base 2. Water cooling system 3. Furnace stack 4. Inductor 5.Sealing rotary bearing 6.Observation window 7.Feeder 8.Electrode 9. stove lids 10.Temperature Measuring 11.Vacuum system 12.Inflatable vacuum solenoid valve 13.vent valve 14.Φ50 Vacuum valve 15.Φ300)

Furnace Structure(1. Base 2. Water cooling system 3. Furnace stack 4. Inductor 5.Sealing rotary bearing 6.Observation window 7.Feeder 8.Electrode 9. stove lids 10.Temperature Measuring 11.Vacuum system 12.Inflatable vacuum solenoid valve 13.vent valve 14.Φ50 Vacuum valve 15.Φ300)

Vacuum induction melting furnace details

Vacuum induction melting furnace details

Features

The Vacuum Induction Melting Furnace is a sophisticated piece of equipment designed to melt metals under high vacuum conditions, offering numerous benefits for research and production in various industries. This furnace is particularly beneficial for melting valuable active metals and alloys, preventing reactions with non-metallic inclusions, and removing harmful dissolved gases and pollutants from the molten metals. Here are the main features of this furnace:

  • Air-Tight Water-Cooled Steel Jacket: The furnace is equipped with an air-tight, water-cooled steel jacket that can withstand the required vacuum for processing, ensuring a stable and controlled environment for melting.
  • Induction Heating System: Utilizing medium frequency induction heating, the furnace can reach temperatures up to 2000℃, making it suitable for melting a wide range of metals and alloys, including nickel, special steel, and high-temperature alloys.
  • Crucible and Refractory Lining: The metal is melted in a crucible housed in a water-cooled induction coil, and the furnace is lined with suitable refractories to enhance durability and performance.
  • Vacuum and Inert Gas Casting: The molten metal can be poured or cast under either vacuum or inert gas environments, providing flexibility in processing and ensuring the purity of the final product.
  • Advanced Features: Depending on the size and model, the furnace may include tilt and pour mechanisms, casting chambers, sampling ports, and mould handling facilities with vacuum interlock systems, enhancing automation and precision in the melting process.

These features collectively ensure high-quality melting and casting of metals, making the Vacuum Induction Melting Furnace an indispensable tool for industries requiring precision and purity in their metalworking processes.

Principle

The vacuum induction melting furnace operates on the principle of medium frequency induction heating, where a high vacuum environment is created to melt metals. The furnace utilizes an induction coil to generate an alternating electromagnetic field, which induces eddy currents within the metal, causing it to heat up and melt. The vacuum environment prevents oxidation and contamination of the molten metal, allowing for the production of high-purity alloys. This process is particularly suitable for melting high-temperature alloys, active metals, and materials requiring precise composition control.

Advantages

Vacuum induction melting furnace is mainly composed of furnace body, support, inductor, furnace tilting mechanism, vacuum system, medium frequency power supply and electrical control system.

  • Furnace body: The furnace body and furnace cover have water-cooled interlayer to ensure the furnace surface temperature will not be too high; Side door at the furnace body can be added  according to user requirements; Furnace cover is equipped with alloy feeder and observation window, which can add different alloy raw materials during smelting and observe the working conditions in the furnace.
  • Inductor: The furnace inductor is coiled into a spiral coil with thick wall copper tubes, and the outer layer of the induction coil is covered with a ceramic coating, which increases the firmness and extends the service life of the coil while ensuring the insulation of the coil.
  • Furnace tilting mechanism: manual furnace tilting, electric furnace tilting and hydraulic furnace tilting are available for users to choose. The furnace tilting angle is designed to tilt forward 105 degrees and backward 10 degrees without residual liquid. The furnace tilting speed can be adjusted continuously.
  • Vacuum system: consists of mechanical pump, roots pump, diffusion pump or booster diffusion pump, vacuum valve, damping elastic sleeve and vacuum pipeline. The configuration principle of vacuum system is to configure according to the physical and chemical properties and process of smelting materials.
  • Medium frequency power supply: IGBT medium frequency power unit, max. Temperature is up to 2000 ℃ .
  • Electrical control: Touch screen controller with PLC, vacuum measuring instrument, temperature measuring instrument and operation button, indicator light,and other components. It can realize the operation and control of pneumatic system, vacuum system, furnace cover lifting, furnace tilting, etc.

Safety Advantage

  • Effectively control and adjust alloy composition to produce high-performance metal or alloy materials.
  • Capable to inhibit the formation of non-metallic oxide inclusions produced in the metal solution and cast high-quality castings.
  • The unique electromagnetic stirring feature can effectively avoid element segregation during alloy smelting.
  • According to the different melting points of elements, some harmful volatile trace elements, such as antimony, tellurium, selenium, bismuth, etc., can be removed purposely

Technical specifications

Crucible effective volume 4L
Crucible effective capacity (Steel) 20kgs
Max temperature 2000 ℃
Max melting vacuum
  • 7×10-3Pa 
  •  Vacuum time: open diffusion pump when preheating is complete, then up to 7×10-3Pa in 30 minutes.
Rated power 60KW
Rated voltage 375V
Power frequency 50HZ
Rated frequency 1500~2500HZ
Rated frequency 1500~2500HZ
Heat element Induction copper coil
Vacuum system
  • 70L/s Double stage Rotary vane mechanical pump
  • Dia.300mm diffusion pump, Max. pumping speed: 5000L/s
  • Dia.300mm diffusion pump clod trap, effective cooling cycle for pump oil
  • Dia.300mm diffusion pump flapper valve + Dia.80mm former pump flapper valve
  • Stainless pipe + stainless bellows
Model Capacity Temperature Vacuum Rated power
KT-VI5 5kg 1700 ℃ 6x10-3Pa 40Kw
KT-VI10 10kg 40Kw
KT-VI25 25kg 75Kw
KT-VI50 50kg 100Kw
KT-VI100 100kg 160Kw
KT-VI200 200kg 200Kw
KT-VI500 500kg 500Kw
Semi-contentiously melting production can be customized

Melting process and  Maintenance

Please click: Melting process and maintenance of vacuum induction melting furnace

Warnings

Operator safety is the top important issue! Please operate the equipment with cautions. Working with inflammable& explosive or toxic gases is very dangerous, operators must take all necessary precautions before starting the equipment. Working with positive pressure inside the reactors or chambers is dangerous, operator must fellow the safety procedures strictly. Extra caution must also be taken when operating with air-reactive materials, especially under vacuum. A leak can draw air into the apparatus and cause a violent reaction to occur.

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FAQ

What is a vacuum furnace used for?

A vacuum furnace is used for high-temperature processing of materials in a controlled environment without any contamination. It operates by surrounding the product with a vacuum, which prevents oxidation and heat loss from the product through convection. This furnace is commonly used for heat treatment of steel alloys at temperatures below 1200 °C. High-temperature vacuum furnaces can reach temperatures up to 3000°C and are used for industrial processes such as sintering, brazing, annealing, and heat treatment with high consistency and low contamination. The ability to achieve uniform heating across the entire workpiece is a key benefit of using a high-temperature vacuum furnace.

How does a vacuum induction melting furnace work?

A vacuum induction melting furnace works by utilizing electromagnetic induction under vacuum or protective atmosphere conditions to melt metals and alloys that combine easily or have close affinity with oxygen, nitrogen, and hydrogen. The furnace contains a refractory-lined crucible enclosed by an induction coil that generates an eddy current of heat in the material being processed. The furnace's vacuum system totally eradicates gases from the molten metals, and the cooling system contributes to the controlled melting temperature. The furnace is highly reliable, gives high productivity, and produces metals with very close compositional tolerances.

What is vacuum arc melting process?

Vacuum arc melting (VAR) is a secondary melting process used to produce metal ingots with high chemical and mechanical homogeneity for critical applications in industries like aerospace, energy, and nuclear. The process involves refining liquid metal under vacuum and controlling its solidification rate. It is used for the purification of reactive titanium or zirconium alloys, without any contact with casting refractories, as well as for improving inclusion cleanliness in steels and superalloys. The remelted cylindrical ingots can weigh several tons, and VAR has revolutionized the specialty metallurgical techniques industry.

What is the process of a vacuum furnace?

The process of a vacuum furnace involves loading the parts into the chamber and creating a vacuum inside it by utilizing a vacuum pump. The next step is to heat the parts using temperature controls, which can reach between 1,500 and 5,400 degrees Fahrenheit. This process eliminates the possibility of oxidation and contamination, resulting in a higher purity end product. After heating, the parts are cooled and finished before being removed from the vacuum furnace. The furnace consists of various components, including the vacuum system, furnace shell, electric heating element, temperature controls, power supply system, and transport apparatus.

What are the advantages of vacuum induction melting?

The advantages of vacuum induction melting (VIM) include the elimination of gases, superior process control, close control of chemical analysis, slag-free melting, and melt protection. VIM is currently the most energy-efficient, fastest, low-consumption, and environmentally friendly induction heating technology for heating metal materials. The technology offers exceptional and reproducible control of reactive element-containing compositions and eliminates the need for a protective slag cover, decreasing the potential for accidental contamination or inclusions in the ingot. The process takes place in a vacuum environment, making it beneficial to remove gas impurities inside the metal, resulting in a more pure metal alloy material.

What is VAR Vacuum Arc Remelting (VAR)Furnace?

VAR or Vacuum Arc Remelting is a process used to refine and improve the cleanliness of ingots made from standard air-melted, vacuum induction melted, or ESR remelted alloys. It is used for steels, superalloys, titanium, zirconium, and their alloys in industries such as aerospace, power generation, defense, medical, and nuclear. VAR is a continuous remelting process of a consumable electrode under vacuum, with DC power used to strike an arc between the electrode and a copper mold. The process removes dissolved gases, reduces undesired trace elements, improves oxide cleanliness, and achieves directional solidification of the ingot from bottom to top.

What gas is used in a vacuum furnace?

Different gases can be used in a vacuum furnace depending on the application. In general, vacuum furnaces can work with gases or mixtures such as Argon, Nitrogen, Hydrogen, Carbon Monoxide, Helium, among others. The use of these gases allows for heat treatment in a defined, mostly non-oxidizing atmosphere, which is required for various applications such as vacuum soldering and brazing, vacuum annealing, and sintering. Additionally, it is possible to work with a defined oxygen concentration that is different from the air composition.

How does vacuum help in induction melting furnace?

Vacuum conditions are critical in induction melting furnaces as they help to eliminate gases from the molten metals, preventing quick oxidation. The absence of gases during the melting process ensures the creation of very close compositional tolerances, resulting in consistent metals. The vacuum also provides a protective atmosphere for metals that combine easily or have a close affinity with oxygen, nitrogen and hydrogen. Vacuum induction melting furnaces use electromagnetic induction to melt metals and alloys in a refractory lined crucible enclosed by an induction coil, creating eddy currents that make the melting process possible.

How does vacuum arc melting furnace work?

A vacuum arc melting furnace works by melting materials under a vacuum or low-pressure atmosphere using electric arcs. The furnace uses two electrodes, one of which is the material to be melted. The electrodes are brought close together and an electric arc is struck between them, causing the material to melt. The furnace is then evacuated to remove any impurities and the molten material is cast into a desired shape. This process is used for the production of high-purity metals, alloys, and intermetallics used in industries such as aerospace, electronics, and biomedical engineering.

What is the heating element used in a vacuum furnace?

The heating element in a vacuum furnace is critical to its proper functioning, and is dependent on factors such as maximum operating temperature, power load, partial pressure and quench gases, and life expectancy. Vacuum furnaces are heated by electric resistance elements made from a variety of materials, including high-temperature metallic alloys such as stainless steel, nickel-chromium, molybdenum, tungsten, tantalum, or of non-metallic materials such as graphite and silicon carbide. The choice of material for the heating element is important in maximizing its longevity, reliability, efficiency, and ultimately the process results.

What is vacuum induction melting furnace?

A vacuum induction melting furnace is a metallurgical furnace that uses an alternating electromagnetic field to melt and form various materials under vacuum or protective atmosphere. It is widely used in the vacuum metallurgy field and is essential for producing alloys and special steels used in the aerospace, electronics, and atomic energy industries. Vacuum induction melting furnaces are also used to improve the hot workability and mechanical properties of nickel, cobalt, and iron-based superalloys, as well as to melt stainless steel, heat-resistant steel, ultra-high strength steel, and various other materials to ensure their quality and performance.

What are the applications of vacuum arc melting furnaces?

Vacuum arc melting furnaces are commonly used in the production of high-performance materials, such as superalloys, special steels, and reactive metals. These materials often require high-purity and controlled composition, which can be achieved through vacuum arc melting. The process is particularly suited for the production of critical components in aerospace, automotive, and energy industries, where high strength, corrosion resistance, and temperature stability are vital. Vacuum arc melting is also used in research and development settings to produce small quantities of specialized alloys for testing and characterization purposes.

What are the advantages of using vacuum arc melting furnaces?

Vacuum arc melting furnaces offer several advantages. Firstly, the high vacuum environment prevents oxidation and contamination, resulting in high-purity melted metals. This is especially important for producing materials with stringent quality requirements. Secondly, the electric arc generates intense heat, allowing for rapid and efficient melting of the metal. The process can be precisely controlled to achieve specific melting parameters, such as temperature, pressure, and cooling rate, facilitating the production of alloys with desired properties. Vacuum arc melting furnaces also offer flexibility in terms of the size and shape of the melted metal, as the consumable electrode can be easily replaced or modified. Additionally, the process allows for the selective removal of impurities, such as gases and non-metallic inclusions, further enhancing the purity and quality of the final melted metal.

What safety precautions should be followed when using a vacuum arc melting furnace?

When using a vacuum arc melting furnace, several safety precautions should be followed to ensure safe operation. Firstly, the furnace should be operated by trained personnel who are familiar with the equipment, its operation, and safety protocols. Adequate personal protective equipment, such as heat-resistant gloves, safety goggles, and fire-resistant clothing, should be worn when handling hot materials or operating the furnace. The vacuum system should be regularly inspected and maintained to ensure proper functionality and prevent safety risks. It is important to follow the manufacturer's guidelines and instructions for safe operation and maintenance of the vacuum arc melting furnace. Additionally, proper handling and disposal of consumable electrodes and melted materials should be carried out according to established safety guidelines and regulations. Regular inspections and maintenance of the furnace, including electrical systems, cooling systems, and gas handling components, should be performed to ensure safe and reliable operation.
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