滑动接触中摩擦温度的测定及其影响

The Measurement of Frictional Temperature and Its Effect in Slidng Contact

作者从摩擦温度的观点考察了钢在滑动接触中擦伤的温度效应。擦伤试验是在环-块试验机上进行的。采用埋在固定的块试样表面下0.15～0.25mm深度处的NiCr-NiAI热电偶测量摩擦温度。热电势由采样间隔为5ms的数字电压表测得。 研究结果表明,金属发生擦伤时的表面摩擦温度T_(oa)与载荷及滑动速度有关:载荷越高,T_(oa)也越高;而滑动速度越高,则T_(oa)越低。金属擦伤时,表面形成“白层”组织,认为这是由于瞬时经历很高的摩擦温度及随后的快速冷却所致。

The temperature effect of scuffing in sliding contact of steel is explored from the point of view of frictional temperature. The experiments of scuffing have been conducted on the ring-on-block testing machine. The measurement of frictional temperature has been done with a fine thermocouple of NiCr-NiAl, attached to the bottom of a hole, within the rang of 0.15-0.25mm below the surface of stationary block specimen. The thermoelectrical potential is measured by a digital voltmeter with sampling interval of 5ms. The results show that the average surface frictional temperature Toa,when scuffing occurs, increases with the load increase and the sliding velo'city decrease. During the metal scuffing, the nature of the 'white layer' on the scuffing surface is examined. It is considered that the white layer is formed because of being subjected to very high fricional temperature, and afterwards cooling quickly.