Why can’t the refurbished bearing be used again?
Author: hongyuanTime:
Why can’t the refurbished bearing be used again?
Today HONB will explain why the hardness of the used bearing is not as good as the bearing made of steel directly after annealing again. HONBbearing02
HONB simply uses a bearing processing process to illustrate:
Material–forging–annealing (to reduce the hardness, in order to improve the quality and efficiency of turning processing)-turning–heat treatment (1. Quenching: increase the hardness, the appearance of acicular martensite or bainite. 2. Tempering: Eliminate internal stress, stabilize organization and size)-grinding–assembly–packaging
After reading the process, you should pay attention at this time. The martensite that appears after quenching is needle-shaped with large internal stress. If it is not tempered to eliminate it, the bearing is prone to cracks and fatigue during work. Acicular martensite needs to be tempered to relieve stress, and its performance cannot be restored after annealing. It is precisely because of its irreversible or reversible property that its properties will decrease. Don’t think about reprocessing used bearings to meet the original requirements!
HONB will give you a general introduction: if you pull the spring hard and let go, the spring will become slightly longer than before, and then press the spring again. You can restore it to its original size, but can you restore it to its original elasticity? After all, its elasticity has been weakened after your first stretch. So do not use refurbished bearings. Products
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