The development of vacuum induction furnace how?

The development of vacuum induction furnace how?

The creation of the vacuum induction furnace and development plays an very important role in human progress. Appeared in the shang dynasty in China, relatively perfect copper smelting furnace, furnace temperature reached 1200 ℃, the stove inside diameter of 0.8 meters. In the spring and autumn period and the warring states period, people in molten copper furnace on the basis of further mastered the technology of improving furnace temperature, so as to produce the cast iron.
In 1794, the world appeared a straight cylindrical cupola melting cast iron. In 1864, after the French Martin by using the principle of the British Siemens regenerative furnace, built the first steel open hearth is heated with gas fuel. He used the regenerator to high temperature of air and gas, so as to ensure the steel needed for the temperature above 1600 ℃. Around 1900, power supply sufficient gradually, started to use a variety of resistance furnace, electric arc furnace and cored induction furnace.
In the 20th century 50 s, coreless induction furnace to get rapid development. Then the electron beam furnace, the use of electron beam to impact solid fuel, can strengthen the surface heating and melting of the high melting point materials. Used to forge heating furnace was first hand forge, the working space is a concave groove, groove filling in coal, combustion with air from the bottom of the tank for the artifacts buried heating in the coal. This furnace thermal efficiency is very low, the heating quality is not good, and only small workpiece heating, after development for refractory brick build by laying bricks or stones becomes close partly or fully enclosed chamber of a stove or furnace chamber furnace, can use coal, gas or oil as fuel, also can use electricity as a heat source, the artifacts in the chamber of a stove or furnace heating.
To facilitate heat large workpiece, again is suitable for heating ingot and billet bogie hearth furnace, heat for long bar also appeared well type furnace. After the 1920 s appeared to raise the productivity of the furnace and improving working conditions of mechanization, automation of furnace type. Industrial furnace fuel also as fuel resources development and the progress of fuel conversion technology, and by using solid fuels such as coal, coke, coal gradually convert producer gas, city gas, natural gas, gas and liquid fuels such as diesel oil, fuel oil, and developed and that meet the needs of all kinds of fuel used in combustion devices.