沟槽型表面织构对界面摩擦振动噪声特性的影响

Effect of grooved surface texture on interface friction vibration and noise properties

用电火花加工方法在列车制动盘蠕墨铸铁材料表面加工出具有不同沟槽宽度和间距的平行间隔分布的沟槽型表面织构,在自行研制的新型摩擦噪声试验装置上,采用球-平面接触方式,对沟槽型织构表面和光滑表面进行摩擦噪声对比试验,研究沟槽型织构对摩擦噪声的影响及其作用机理。试验结果表明,在该试验条件下的摩擦噪声产生主要归因于界面摩擦力的高频成分,而磨损表面的犁沟、磨屑和剥落等不平顺是导致这些高频成分的主要界面因素。尺寸分布合理的沟槽能持续有效打断摩擦界面连续的接触,抑制界面摩擦力高频成分的产生,扰乱摩擦系统的自激振动,并最终降低摩擦噪声。

Groove-textured surfaces with different widths and pitches were manufactured on compacted graphite iron materials (brake disc material) using electromachining, the grooves were distributed with parallel regular intervals. The influence of grooved surface texture on friction noise were studied in a ball-on-flat style by using a new-developed friction noise experimental apparatus, and the difference between the effects of groove-textured surface and smooth surface on friction noise properties was investigated. The test results showed that the generation of friction noise in this study can be mainly attributed to the high frequency components of the interface friction force, they mainly result from the irregularities of the worn surface, such as, ploughing, wear debris and detachment; groove-textured surfaces with a reasonable size distribution of grooves can effectively interrupt the continuous contact of the friction surfaces, they suppress the generation of high frequency components of the interface friction force and disturb the self-excited vibration of the friction system, and consequently significantly reduce friction noise.