喷砂表面处理控制滑动摩擦尖叫噪声

Controlling Friction induced Squeal by Surface Sandblasting Treatment

采用球—平面接触方式,对喷砂处理的制动盘蠕墨铸铁试样进行了滑动摩擦噪声试验,并与光滑表面样品试验对比。在对摩擦噪声特性和摩擦磨损特性进行综合分析的基础上,探讨控制滑动摩擦尖叫噪声触发和演变规律的关键界面因素,研究了喷砂表面对滑动摩擦尖叫噪声的影响及其机理。结果表明:喷砂处理表面能明显的抑制界面摩擦尖叫噪声的产生,且表面粗糙度越大,抑制尖叫噪声效果越明显,界面微凸体的分布和磨损情况对摩擦尖叫噪声的产生及演变具有关键的影响。该试验条件下摩擦尖叫噪声的产生主要归因于磨屑堆积、粘着剥落和犁沟等界面因素引起界面摩擦力剧烈波动,诱发了摩擦系统的自激振动。相比光滑表面,喷砂处理表面的微凸体接触磨损"平台"表面的磨屑堆积、粘着剥落和犁沟等现象较轻,引起摩擦力波动的能量较弱,产生的尖叫噪声强度较低。

Experimental study of sliding friction noise of compacted graphite iron brake disc samples with/without sandblasting surface treatment was performed in a ball-on-flat configuration. The key interface factors that control the triggering and evolution of squeal were analyzed by combining friction and wear and friction noise properties, and the effect of sandblasting surface on squeal was investigated. The test results show that the sandblasting surface can significantly suppress the generation of squeal, which increases with the increase of surface roughness. The distribution and wear status of surface asperities play a key role in the triggering and evolution of squeal. The generation of squeal was mainly attributed to the severe fluctuation of friction force caused by some interface factors, such as the accumulation of wear debris, detachment and ploughing. Compared with smooth surface, the worn surface of the plateau generated by the wear of asperities show slighter accumulation of wear debris, adhesion, detachment and ploughing, which result in relatively weaker fluctuation of friction force and consequently lower squeal level.