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Korean Journal of Metals and Materials > Volume 55(10); 2017 > Article
Korean Journal of Metals and Materials 2017;55(10): 689-694. doi: https://doi.org/10.3365/KJMM.2017.55.10.689
회주철 브레이크 디스크의 미세조직이 브레이크 떨림에 미치는 영향 연구
정민균1, 이재영1, 최진용2, 김윤철1, 김성진3
1현대자동차 연구개발본부 고무마찰재료개발팀
2현대성우캐스팅 부품개발팀
3현대자동차 연구개발본부 전기전자재료개발팀
An Investigation of the Effect of Gray Iron Brake Disc Microstructure on Brake Judder
Min-Gyun Chung1, Jae-Young Lee1, Jin-Yong Choi2, Yoon-Cheol Kim1, Seong Jin Kim3
1Elastomer & Tribo Materials Development Team, Hyundai Motor Company, Hwaseong 18278, Republic of Korea
2Product Development Team, Hyundai Sungwoo Casting, Pohang 37860, Republic of Korea
3Electrical & Electronic Materials Development Team, Hyundai Motor Company, Hwaseong 18278, Republic of Korea
Correspondence  Min-Gyun Chung ,Tel: +82-31-5172-3514, Email: mg@hyundai.com
Received: 10 April 2017;  Accepted: 7 July 2017.  Published online: 28 September 2017.
ABSTRACT
Brake judder is a kind of low-frequency brake vibration and noise phenomenon generated during braking. Various types of judder have been reported, depending on the particular generation mechanism. However, the correlation between the microstructure of gray iron brake discs and judder has seldom been discussed in the literature. In this research, the effect of the microstructure of a gray iron brake disc on judder was investigated using a single end full dynamometer. Judder propensity was evaluated by measuring BTV (brake torque variation), and the effect of cell counts of eutectic gray iron on the friction surface of the brake disc was also measured in the circumferential direction. The eutectic cell counts were controlled by changing the machining thickness of the friction surface. Results showed that the microstructure of the gray iron disc played a crucial role in controlling brake vibration during braking. In this work, reduction in the eutectic cell counts resulted in less brake torque variation, suggesting more stable brake performance.
Keywords: brake judder, brake disc, eutectic cell, gray iron, brake torque variation (BTV)
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