制动MPU现象研究和解决方案

Research And Solution Of Brake MPU Phenomenon

MPU全称Metal Pick Up,即金属镶嵌,摩擦材料嵌入金属,金属来源于制动对偶件-制动盘,该现象在汽车制动系统中较为常见。某款车型制动器开发过程中,前盘式制动器出现MPU金属转移现象。对其拆解下的制动片进行了金属膜元素检测,能谱分析谱图显示,在除摩擦材料正常成分如Si、Ca、S、Ti等之外,存在于对偶件制动盘相同的金属元素,同时制动盘工作面在对应摩擦片金属膜位置有相应的犁沟,属于典型的MPU现象。对该车型制动MPU现象进行了机理及优化路线分析,惯性台架对比验证,结果表明陶瓷材料中的氧化锆、硅酸锆、二氧化硅等在高温高压下形成硬质点,当其硬度大于制动盘的硬度时,对制动盘产生犁沟作用,犁沟作用产生的盘上金属镶嵌到摩擦材料表面,形成金属转移。通过对制动片配方进行优化,改善摩擦片材料传热及散热性,该车型制动MPU现象得到很好控制,达到了设计要求。

Mpu(Metal Pick Up),mean damascene,friction materials,the metal comes from the brake dual-brake disc,this phenomenon is common in automobile brake system.In the development process of a certain type of brake,MPU metal transfer occurs in front disc brake.The metal film elements of the disassembled brake plates were detected,Energy spectrum analysis spectrogram display,In addition to the normal components of friction materials such as Si,Ca,S,Ti,etc.,the same metal elements exist in the dual brake disc,At the same time,there are furrows on the working face of the brake disc at the corresponding position of the friction plate metal film,which is a typical MPU phenomenon.The phenomenon of the vehicle braking MPU mechanism and optimize the path analysis,the inertial platform verification,the result shows that the bonding agent of a ceramic material under high temperature and high pressure formation of hard spots after carbonization,when the hardness is greater than the hardness of brake disc,brake disc furrow action,furrow effect produced by plate metal Mosaic to the friction material surface,the formation of metal transfer.By optimizing the brake pad formula and improving the heat transfer and heat dissipation of friction plate material,the braking MPU phenomenon of this model is well controlled and meets the design requirements.