沟槽表面特征对制动过程制动盘温度场和应力场影响的研究

Effect of Groove Surface Features on Temperature Field and Stress Field of Brake Disc in Braking Process

针对制动盘表面温升严重、磨损剧烈等问题,建立沟槽表面制动盘制动过程模型并进行热机耦合有限元分析,研究沟槽的角度、宽度、密度对制动盘温度场和应力场的影响。结果表明:沟槽结构可以储存空气,加快制动盘与外界的换热,具有散热性,并且减小了表面直接接触摩擦的面积,从而导致了沟槽型表面制动盘比光滑表面制动盘温度低和等效应力小;沟槽角度、宽度对制动盘表面温度和等效应力影响明显,其中沟槽角度为45°、宽为4 mm的沟槽型表面制动盘温度和等效应力值最小;沟槽密度对制动盘表面温度和等效应力影响不明显。

Aiming at the problems of severe temperature rise and severe wear on the surface brake disc,the braking process model of the groove surface brake disc was established and the thermo-mechanical coupling finite element analysis was carried out to research the effect of the angle,width and density of the groove on the brake disc temperature field and stress field.The results show that the groove structure can store air and accelerate the heat transfer between the brake disc and the surrounding environment,which has good heat dissipation and reduces the area of direct contact friction on the surface,resulting in lower temperature and less equivalent stress of the grooved surface brake disc compared with the smooth surface brake disc.The groove angle and width have obvious effect on the surface temperature and the equivalent stress of brake disc,the temperature and equivalent stress of the surface brake disc with groove angle of 45°and width of 4 mm are the minimum.The effect of groove density on the surface temperature and equivalent stress of the brake disc is not obvious.