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Determination of the temperature of the forging furnace
Within a certain temperature range, the plasticity of metal materials will increase as the temperature rises, and the deformation resistance will decrease. With a small deformation force, the billet can be stably changed in shape without cracking. Therefore, when forging with a forging furnace, it is necessary to correct Workpiece heating.
So what is the method to determine the forging temperature range? Let's first look at the basic principles for determining the forging temperature range.
Within the forging temperature range, the metal should have good plasticity and low deformation resistance to facilitate forging deformation; it can improve the internal structure and properties of the metal to obtain high-quality forgings; the width of the range should be as large as possible to reduce heating times and improve Productivity.
The determination of the initial forging temperature is mainly to ensure that no over-burning phenomenon occurs. Therefore, the initial forging temperature of carbon steel should be 150~250℃ lower than the solidus line of the iron-carbon equilibrium diagram. When using high-speed hammer for precision forging, the high-speed deformation will produce a great thermal effect, which will increase the temperature of the blank and cause overburning, so the initial forging temperature should be about 100 °C lower than the usual initial forging temperature.
The determination of the final forging temperature not only ensures that the metal has sufficient plasticity before final forging, but also enables the forging to obtain good microstructure and properties. Therefore, in general, the final forging temperature should be slightly higher than its recrystallization temperature, which not only ensures the blank There is still enough plasticity before the final forging, and the recrystallization can be completely recrystallized, and a better fine grain structure can be obtained.
As far as carbon steel is concerned, if the final forging temperature is too high, the grains of the forgings will be coarse, and even Widmanrite will be produced. The final forging temperature cannot be lower than the A1 line of the iron-carbon balance diagram. Otherwise, the plasticity will be significantly reduced, the deformation resistance will increase, the work hardening phenomenon will be serious, and forging cracks will easily occur.
So what is the method to determine the forging temperature range? Let's first look at the basic principles for determining the forging temperature range.
Within the forging temperature range, the metal should have good plasticity and low deformation resistance to facilitate forging deformation; it can improve the internal structure and properties of the metal to obtain high-quality forgings; the width of the range should be as large as possible to reduce heating times and improve Productivity.
The determination of the initial forging temperature is mainly to ensure that no over-burning phenomenon occurs. Therefore, the initial forging temperature of carbon steel should be 150~250℃ lower than the solidus line of the iron-carbon equilibrium diagram. When using high-speed hammer for precision forging, the high-speed deformation will produce a great thermal effect, which will increase the temperature of the blank and cause overburning, so the initial forging temperature should be about 100 °C lower than the usual initial forging temperature.
The determination of the final forging temperature not only ensures that the metal has sufficient plasticity before final forging, but also enables the forging to obtain good microstructure and properties. Therefore, in general, the final forging temperature should be slightly higher than its recrystallization temperature, which not only ensures the blank There is still enough plasticity before the final forging, and the recrystallization can be completely recrystallized, and a better fine grain structure can be obtained.
As far as carbon steel is concerned, if the final forging temperature is too high, the grains of the forgings will be coarse, and even Widmanrite will be produced. The final forging temperature cannot be lower than the A1 line of the iron-carbon balance diagram. Otherwise, the plasticity will be significantly reduced, the deformation resistance will increase, the work hardening phenomenon will be serious, and forging cracks will easily occur.