At present, in order to make use of the waste heat of large forgings, after forging, the heat of the parts is directly used for heat treatment. There are generally three types of forging waste heat heat treatment. Next, I will explain these three types in detail:

(1) After forging heat treatment of forging parts: that is, the forging parts are directly subjected to heat treatment after forging, which closely combines forging and heat treatment. This process is also called high temperature deformation heat treatment. After forging heat treatment can save a lot of energy and man-hours, and improve labor Productivity, in addition, cross heat treatment can also make forgings to obtain good comprehensive mechanical properties. For this reason, countries all over the world adopt a large amount of post-forging waste heat treatment: that is, by controlling the forging and controlling the after forging, to prevent the formation of coarse ferrite and pearlite as well as the precipitation of two-shaped carbides, so that it can directly obtain the equivalent of forging again. The structure and performance of conventional normalizing, isothermal normalizing and quenching performed by heating. In this way, conventional normalizing, equal overflow E hardening and reheating of quenching can be cancelled.

 (2) After forging heat treatment of forged parts: that is, the forging parts after forging are directly sent to the average temperature heat treatment process, and the heat treatment process is still performed according to the conventional forging heat treatment process. This method is called waste heat homogenization heat treatment, such as a PSH type 63MN electric The screw press forging automatic production line is equipped with an automatic quenching and tempering line of a 270kW suspension temperature quenching electric furnace. If the residual heat of the forging is not used, it is necessary to be equipped with a 1000kW quenching resistance heating furnace to produce light vehicle crankshafts and front axles .

(3) Then use part of the waste heat for heat treatment: that is, after inlaying waste heat quenching, after forging, both through waste heat quenching, after forging waste heat normalizing and after forging waste heat isothermal normalizing, the grain size of forgings is larger than conventional heat treatment, which is refined The grain can cool the forging to 600C~650C, and then heat the forging to the required temperature for quenching (normalizing) for quenching (normalizing), which can refine the grain and save the forging from room temperature to 600C. ~650C energy consumption, generally used for forgings with high grain size requirements, which can save about 60% of energy

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