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Technical Requirements For Furnace In Forgings Production
Oct 20, 2017

Technical Requirements for Furnace in Forgings Production
Forgings in the Forgings plant production, the rational size of the steel ingot before the furnace should be calibrated its smelting furnace number, steel, billet weight, size, and check the surface quality, remove the surface defects. Record the location of the furnace, do Forgings the actual operation of the record.
Forgings the steel ingot used in the furnace should be based on the furnace type, the bottom of the furnace size, furnace and the size of the heated steel ingot to determine the distance from the furnace wall, front and rear walls, burners and other distance. It is strictly forbidden to burn the surface of the metal forged. Forge should be used when heating forged horns. The height of the horn should not be lower than the height of the furnace under the burner. Diameter or side length of less than 150mm Forgings billet heating can not use horn.
Forged steel ingots used in the furnace before the surface temperature is lower than 400 ℃ called cold steel ingots, 400-550 ℃ called semi-hot steel ingots, higher than 500 ℃ called hot steel ingots. Hot and cold steel ingot (billet) with a furnace, the spacing between the material must be greater than a blank diameter or side length. Should try to avoid hot and cold steel ingots mixed with a furnace.
It is forbidden to install cold steel ingots (billet) beside the heated forged blank. It is forbidden to heat the ingot (billet) directly with the actual temperature of the spindle below 0 ℃. Inspection of qualified hot steel ingot transported to the Forgings production workshop, should avoid cold air straight blow, should be fashionable furnace, shall not delay the furnace time.
The choice of cutting fluid and cooling method for cutting of stainless steel Forgings is very important. As the stainless steel Forgings of the poor machinability of the cutting fluid cooling, lubrication, penetration and cleaning performance have higher requirements, Forgings plant commonly used cutting fluid are the following categories:
1, sulfurized oil: sulfur is the extreme pressure additive cutting oil. During the cutting process, it can form high melting point sulfide on the surface of stainless steel Forgings, and it is not easy to be destroyed at high temperature, has good lubrication effect and has some cooling effect for stainless steel Forgings. It is suitable for general turning, drilling, reaming and tapping The Soybean oil for drilling, expansion, reaming and other processes. Direct sulfurized oil formulations are: mineral oil 98%, sulfur 2%. Indirect sulfurized oil formulations are: mineral oil 78% to 80%, vegetable oil or lard 18% - 20%, sulfur 1.7%.
2, oil, spindle oil and other mineral oil: the lubrication performance is better, but the cooling and permeability is poor, suitable for Forgings of the cylindrical car.
And the wheel Forgings is the use of Forgings equipment for the raw materials Forgings molding, generally can not Forgings more complex parts, the need for larger processing capacity, but the Forgings structure is relatively dense, not prone to internal defects, it is widely used Requires high parts processing, such as seat, spool, stem, wheel and so on.
Forgings overheating and chemical composition, smelting methods, Forgings temperature, thermal deformation, Forgings cooling rate and furnace temperature uniformity and other factors. Due to the overheating temperature or too long heating time caused by overheating, although the Forgings deformation can be broken overheating coarse grains, but often by the Forgings deformation and deformation uniformity of the restrictions, for more serious overheating, Forgings deformation is not easy to completely eliminate. Therefore, a safe initial Forgings temperature should be determined to prevent overheating. As for the burning, because the Forgings heating temperature is higher, the steel grain is extremely large, and oxygen atoms along the grain boundary intrusion, the formation of network-like oxide and fusible oxide eutectic, so that the binding force between the grains greatly weakened Followed by thermal deformation is easy to produce cracking.