스프로킷 소켓의 마모가 심한 이유는 다음과 같습니다.
(1) The greater the adhesive wear load and the higher the surface temperature, the more serious the adhesion phenomenon. For metal materials with a certain hardness, wear tests are performed under different pressures to obtain a graph of the relationship between wear rate and pressure. When the pressure reaches more than 1/3 of the hardness of the material, severe wear will occur. According to the stress distribution diagram, it can be seen that the maximum stress contact point is the maximum pressure, and its value is 884.4 MPa. Because the quenching hardness of the chain socket is HRC4852, the corresponding hardness value is 4800MPa. Therefore, the pressure is far less than 1/3 of the material's hardness, so adhesive wear is not the main form of sprocket wear.
(2) 접촉 피로 마모
The friction pair of the sprocket and the chain is an alternating contact stress, which is prone to fatigue pitting on the friction surface. The index for judging the contact fatigue strength of metals is the contact fatigue limit, that is, the maximum stress at which pitting corrosion does not occur under a certain number of stress cycles. The contact fatigue limit of 40Cr is σ0H=HRC17 plus 200 after surface quenching treatment, and σ0H=1016MPa is calculated. 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 sprocket surface, and it is easier to cause pitting failure at the maximum stress. However, due to the poor lubrication conditions of the sprocket and the chain, pitting corrosion is too late to form and has caused wear. At this time, the main form of damage is wear rather than pitting. Contact fatigue wear is the main form of sprocket wear, which basically determines the service life of the sprocket.
(3) 연마 마모
체인은 미분탄과 필연적으로 접촉하기 때문에 소량의 미분탄이 스프로킷 체인 소켓의 접점에 도달합니다. 미분탄에는 약간의 날카로운 모래가 포함되어 있어 마찰 과정에서 스프로킷의 표면 재료가 떨어질 수 있습니다. 이것은 연마 마모입니다. 연마 마모는 마찰재의 경도 및 연마재의 경도와 관련이 있습니다. 마모에 대한 연마재 경도의 영향 그래프에서 연마재의 경도가 마찰재의 경도에 가까울 때 마찰재의{0}고속 마모가 발생함을 알 수 있습니다. 석탄 가루에는 약간의 날카로운 모래가 섞여 있기 때문에 이것이 스프로킷의 마모를 가속화시키는 주요 원인 중 하나입니다.
