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许多钢制的机械零件,锻造后均需进行正火处理,经过实践,可将此工艺改为利用锻造余热等温退火,其效益甚好。即模锻件成形切边后置于保温箱内保温缓冷,以一定的冷却速度冷到650℃以下空冷,得到平衡状态的组织,最终热处理后达到常规工艺既定的组织和性能, 一、模锻件的正火现状批量生产的模锻件,目前的正火工艺各有不同。以汽车、拖拉机和机床上的几十种齿轮和一些盘型件、粗短杆件为例,材料多为20CrMnTi、47Cr和45钢,其他钢种也有。根据设备条件有下列情况:
Many steel mechanical parts, after forging are subject to normalizing treatment, after practice, this process can be used to forging isothermal annealing isothermal heat, the benefits are very good. That forging die forging after forming placed in the incubator insulation slow cooling to a certain cooling rate to 650 ° C below the cold air cooling to obtain a balanced state of the organization after the final heat treatment to achieve the established conventional technology and performance, The status quo of mass production of forging pieces, the current normalizing process are different. In the car, tractor and machine tools dozens of gear and some plate, thick rod as an example, the material is mostly 20CrMnTi, 47Cr and 45 steel, other types of steel also. According to the equipment conditions are as follows: