Causes of severe wear of sprocket chain socket
For a metal material with a certain hardness, the wear test is carried out under different pressures to obtain the relationship between the wear rate and the pressure.
(1) The greater the adhesive wear load, the higher the surface temperature, and the more serious the adhesion phenomenon. For a metal material with a certain hardness, the wear test is carried out under different pressures to obtain the relationship between the wear rate and the pressure. When the pressure reaches more than 1/3 of the material hardness, severe wear will occur. According to the stress distribution diagram, it can be known that the maximum stress contact point is the maximum pressure, and its value is 884.4 MPa. Because the quenching hardness at the chain nest is HRC48~52, the corresponding hardness value is 4800MPa. Therefore, the pressure is far less than 1/3 of the material hardness, so adhesive wear is not the main form of sprocket wear.
(2) Contact fatigue wear
The friction pair of sprocket and chain is under alternating contact stress, and fatigue pitting is easy to form on its friction surface. The index for judging the fatigue strength of metal contact is the contact fatigue limit, that is, the maximum stress at which pitting does not occur under a certain number of stress cycles. According to the stress distribution diagram, the maximum stress value of the sprocket socket is 884.4 MPa. Its value is very close to the allowable contact fatigue limit of the surface of the sprocket, and it is relatively easy to cause pitting failure at the maximum stress. However, due to the poor lubrication conditions of the sprocket and the chain, pitting corrosion has not been formed in time, and wear has already been caused. At this time, the main damage form is wear rather than pitting corrosion. Contact fatigue wear is the main form of sprocket wear, which basically determines the service life of the sprocket.
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