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这里介绍一种提高热锻模寿命的方法——模腔几何形状还原法。众所周知,热锻模普遍的损坏形式是模膛内产生塑性变形(见图1),这不但会引起锻件尺寸发生变化,还会造成锻件出模困难。金相分析表明,变形最大部分1、2,在使用过程中出现了组织转变,深度达6mm。在表层以下0.03mm处为铁素体区,其显微硬度为Hul.64Ha。铁素体以下为弥散度很小的索氏体,硬度为HRC31.5～36,这部分组织造成了模具材料的软化,其特点是没有按针状马氏体取向的索氏体。还原法的过程如图2所示。从首批锻件中取出一件作为主锻件,不切边,
Here is a way to improve the life of the hot die - cavity geometry reduction method. As we all know, hot forging die is a common form of damage in the mold cavity plastic deformation (see Figure 1), which will not only lead to changes in the size of forgings, but also forgings die. Metallographic analysis shows that the deformation of the largest part of 1, 2, in the course of the organizational change occurred, the depth of 6mm. 0.03mm below the surface at the ferrite zone, the microhardness Hul.64Ha. The following ferrite sorbite dispersion is small, the hardness of HRC31.5 ~ 36, which caused the softening of the mold material, which is characterized by acicular martensite-oriented sorbite. Restore the process shown in Figure 2. Removed from the first batch of forgings as the main forgings, not trimming,