The purpose and working factors of annealing furnaces

Usage:
Annealing is a metal heat treatment process that refers to the slow heating of a metal to a specified temperature, followed by cooling at an appropriate rate, sometimes natural cooling, and sometimes controlled rate cooling. The purpose of annealing furnace is to reduce hardness, improve machinability, improve or eliminate various structural defects and residual stresses formed in the casting, forging, rolling, and welding processes of steel, reduce the tendency of workpiece deformation, cracking or cracking, refine grains, improve microstructure to improve the mechanical properties of workpieces, eliminate structural defects, average data structure and composition, improve data performance or for future heat treatment, such as annealing Prepare the organization for tempering. In practical consumption, annealing technology is widely used. Depending on the purpose of annealing the workpiece, there are various processes for annealing treatment, including complete annealing, spheroidization annealing, and stress relief annealing. The use of annealing furnace: This furnace series industrial furnace is widely used in various industries such as casting, metallurgy, automotive, aerospace, shipbuilding, light industry, and power. It can be used for various metal workpieces such as high chromium and high manganese steel castings, gray cast iron parts, rollers, bearings, steel balls, lining plates, etc. to stop different annealing heat treatment processes, and is manufactured into a square or circular furnace body structure. The furnace is equipped with refractory bricks and aluminum silicate fiber composite insulation, Alternatively, the furnace lining can be constructed with full fiber insulation, and the workpiece can be placed inside the furnace. The workpiece can be heated by electric heating, fuel or gas heating, and then heated to the required annealing temperature in a natural or maintenance atmosphere. After a period of insulation, the workpiece can be cooled naturally or at a controlled speed.

The main factors of work:
The main factors that affect the operation of the system include the temperature system of the furnace, the type of fuel, the preheating method of air and gas, the type of heated metal, the loading and discharging method of the metal, the selection of automatic control system, the material selection of the furnace body, etc. The furnace temperature of the renovated annealing furnace is divided into three zones, where the workpiece is pushed into the heating zone of the furnace by the pusher, and there are four burners arranged in staggered rows on both sides of the wall. The track is supported by an arch made of refractory bricks, so that the workpiece can be heated on both sides, and then forward is Zone 2 and Zone 3- constant temperature zone. Four burners are arranged in staggered rows at the same height on both sides of the wall. The eight burners are low-pressure vortex burners. A distance beam is set between Zone 1 and Zone 2. Two composite metal heat exchangers are equipped on the top of the furnace in front and behind. The furnace walls on both sides and the furnace bottom are made of bricks. The furnace top is made of refractory fiber felt. A high-pressure fan is used to supply combustion air and exhaust air simultaneously. A regulating valve and flow orifice are set on the gas header and air header. A regulating valve is also set on the injection air header. A set of microcomputer control system, display instrument and maintenance equipment are equipped. NCC system equipment mainly includes high level water tank, water distributor, fog cooling area cooling nozzle, fast cooling area, main cooling area, high density header in fine adjustment area, gas supply pipeline, side spray installation, front and rear air purging installation, steel structure support, etc. The local composition of the system: cooling water is supplied from the high level water tank and its pipeline (or pressurized installation) to the high density header and spray cooler in NCC installation. After the steel plate is cooled, The cooling water accumulates in the return ditch and then flows back to the water treatment system. After the water treatment system stops filtering and cooling, it is supplied to the high-level water tank, forming a circuit.