There are various processes for finishing the friction surfaces of a brake disc, which affect the braking effectiveness of a vehicle in the early stages of use in some cases. To examine the interaction between the disc surface texture, rotational direction, and friction material, a series of experiments on a tribotester using small-scale specimens was conducted.In a previous paper (2013-01-2056), the results from the first series of experiments, which involved of thirty disc surface textures and a less aggressive non-asbestos organic (NAO) friction material in on-brake-drag conditions combining constant speed and normal-load, was reported. Disc surfaces were finished by the following finishing processes in two rotational directions: turning under four cutting conditions, roller burnishing after turning, turning with a wiper insert, and grinding with two stones. Contact-pressure dependency of friction and wear was confirmed. Roller-burnished and wiper-turned discs exhibited different friction and wear at a certain contact pressure between rotational directions in the turning process.In the present study, four discs finished by grinding in a different cross-hatch pattern from that in the previous study and two friction materials (aggressive NAO and low-steel friction materials) were additionally tested. The findings from the test results on friction, wear, and transfer-layer build-up are presented. The directional difference in friction and wear was confirmed to depend on the combinations of disc surface texture, friction material, contact pressure, and test period. Even a grinding-finished disc and low-steel friction material exhibited a directional effect in some cases.


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    Title :

    Experimental Study of Interaction between Brake-Disc Surface Texture and Friction Material on Friction and Wear through Small-Scale Tests on Tribotester


    Additional title:

    Sae International Journal of Passenger Cars. Mechanical Systems
    Sae Int. J. Passeng. Cars - Mech. Syst


    Contributors:

    Conference:

    SAE Brake Colloquium & Exhibition - 32nd Annual ; 2014



    Publication date :

    2014-09-28


    Size :

    13 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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