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                        Vacuum furnace
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                        Taicang Huarui Vacuum Furnace Co., Ltd
                        Address: No.1, Nanzhuan Road, Shuangfeng town, Taicang City
                        Contact person: Zheng Xinghua
                        Mobile: 13285178098
                        Contact: Guan Zhanlong
                        Mobile: 18606226806
                        Contact person: Zheng Shuai
                        Mobile: 13285179528
                        Tel: 0512-88826556
                        Fax: 0512-53630028
                        Email: 1306769879@qq.com
                        National Service Hotline:
                        0512-53630028
                        Website: www.mcafe-e.com

                        Development history of vacuum furnace

                        Release date: 2014-04-19 00:00 source: http://www.mcafe-e.com Click:

                        The creation and development of vacuum furnace plays a very important role in human progress. In the Shang Dynasty, a relatively perfect copper smelting furnace appeared in China, and the furnace temperature reached
                        1200 ℃, the inner diameter of the furnace is 0.8m. In the spring and Autumn period and the Warring States period, people further mastered the technology of increasing furnace temperature on the basis of copper melting furnace
                        And produced cast iron.
                        In 1794, a cupola with a straight barrel for melting cast iron appeared in the world. By 1864, the French Martin used the savings of the British Siemens
                        Based on the principle of hot furnace, the first steel-making open hearth furnace heated by gas fuel was built. He uses the regenerator to preheat the air and gas at high temperature
                        The temperature above 1600 ℃ required for steelmaking is ensured. Around 1900, the power supply was gradually sufficient, and various resistance furnaces and electric arcs were used
                        Furnace and cored induction furnace.
                        In 1950s, coreless induction furnace developed rapidly. Then there was the electron beam furnace, which used the electron beam to impact the solid fuel
                        It can strengthen the surface heating and melting of materials with high melting point. The earliest furnace for forging heating was hand forging furnace, whose working space was a concave groove
                        , the tank is filled with coal, the air for combustion is supplied from the lower part of the tank, and the workpiece is buried in the coal for heating. The heat efficiency of this furnace is very low, heating
                        The quality is not good, and it can only heat small workpieces. Later, it will be developed into a semi closed or fully closed chamber furnace built of refractory bricks
                        Coal, gas or oil can be used as fuel and electricity can also be used as heat source. The workpiece is placed in the furnace for heating.
                        For the convenience of heating large workpieces, a trolley type furnace suitable for heating ingots and large billets has appeared, and a well has also appeared for heating long bars
                        Furnace. After 1920s, there appeared various mechanized and automatic furnace types that could improve productivity and labor conditions. Industry
                        With the development of fuel resources and the progress of fuel conversion technology, the fuel of the boiler has been gradually changed from solid fuel such as lump coal, coke and pulverized coal
                        Gas and liquid fuels such as producer gas, city gas, natural gas, diesel oil, fuel oil, etc. are used, and they are suitable for the fuel used
                        All kinds of combustion devices.
                        The structure of vacuum furnace, heating technology, temperature control and atmosphere in the furnace will directly affect the product quality after processing. Heating in forging
                        In the furnace, increasing the heating temperature of metal can reduce the deformation resistance, but too high temperature will cause grain growth, oxidation or overburning, which will seriously affect
                        Workpiece quality. In the process of heat treatment, if the steel is heated to a point above the critical temperature and then cooled suddenly, the hardness of the steel can be improved
                        If it is heated to a point below the critical temperature and cooled slowly, the hardness of the steel will be reduced and the toughness will be increased.
                        In order to obtain the workpiece with accurate size and smooth surface, or to reduce metal oxidation to protect the mold, reduce machining allowance, etc
                        Can use all kinds of less non oxidation heating furnace. Reducing gas is produced by incomplete combustion of fuel in open flame non oxidation heating furnace
                        When the workpiece is heated, the oxidation loss rate can be reduced to less than 0.3%.
                        The controlled vacuum furnace uses the atmosphere prepared manually, which can be gas carburized, carbonitriding, bright quenching, normalizing and annealing
                        Equal heat treatment: to change the metallographic structure and improve the mechanical properties of the workpiece. In a flowing particle furnace, the combustion gas of the fuel is used,
                        Or other fluidizing agent applied externally, forcibly flows through the graphite particles or other inert particles layer on the hearth, and the workpiece buried in the particle layer can achieve strong
                        Chemical heating can also be used for carburizing, nitriding and other non oxidation heating. In the salt bath furnace, the molten salt liquid is used as the heating medium to prevent working
                        Oxidation and decarburization of parts.
                        The melting of cast iron in cupola is often affected by the quality of coke, the way of air supply, the condition of charge and the temperature of air
                        It is difficult to obtain high quality molten iron. The hot blast cupola can effectively raise the temperature of molten iron, reduce the burning loss of alloy and reduce the oxidation of molten iron
                        Therefore, high grade cast iron can be produced.
                        With the appearance of coreless induction furnace, cupola will be replaced gradually. The smelting work of this induction furnace is not subject to any cast iron grade
                        The limitation is that the quality of molten iron can be improved from smelting one grade of cast iron to smelting another grade of cast iron. some
                        Special alloy steel, such as ultra-low carbon stainless steel, as well as steel for rolls and turbine rotors, needs to be melted from open hearth furnace or general electric arc furnace
                        In the refining furnace, impurities are removed by vacuum degassing and argon agitation to further refine high-purity and large capacity high-quality molten steel.
                        The flame furnace has a wide range of fuel sources and low price. It is convenient to adopt different structures according to local conditions, which is conducive to reducing production costs, but it is difficult to use the flame furnace
                        In order to achieve accurate control, the environmental pollution is serious and the thermal efficiency is low. The characteristics of electric furnace are uniform furnace temperature, easy to realize automatic control and high heating quality
                        Good quantity. According to the way of energy conversion, electric furnace can be divided into resistance furnace, induction furnace and electric arc furnace. Furnace calculated in unit time unit furnace bottom area
                        Heating capacity is called furnace productivity. The faster the furnace temperature rises and the larger the furnace load, the higher the furnace productivity. In general,
                        The higher the furnace productivity, the lower the unit heat consumption per kilogram of material heated. Therefore, in order to reduce the energy consumption, we should produce at full load
                        Increase the productivity of furnace as much as possible, and implement fuel for combustion device at the same time


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                        Address: No.1, Nanzhuan Road, Shuangfeng
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                        Email: 1306769879@qq.com

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