Coefficient of Friction of a Brake Disc-Brake Pad Friction Couple

• Autorzy: Orłowicz A. W. , Mróz M. , Wnuk G. , Markowska O. , Homik W. , Kolbusz B
• Języki publikacji: EN

Abstrakty

EN

The paper concerns evaluation of the coefficient of friction characterising a friction couple comprising a commercial brake disc cast of flake graphite grey iron and a typical brake pad for passenger motor car. For the applied interaction conditions, the brake pressure of 0.53 MPa and the linear velocity measured on the pad-disc trace axis equalling 15 km/h, evolution of the friction coefficient μ values were observed. It turned out that after a period of 50 minutes, temperature reached the value 270°C and got stabilised. After this time interval, the friction coefficient value also got stabilised on the level of μ = 0.38. In case of a block in its original state, stabilisation of the friction coefficient value occurred after a stage in the course of which a continuous growth of its value was observed up to the level μ = 0.41 and then a decrease to the value μ = 0.38. It can be assumed that occurrence of this stage was an effect of an initial running-in of the friction couple. In consecutive abrasion tests on the same friction couple, the friction coefficient value stabilisation occurred after the stage of a steady increase of its value. It can be stated that the stage corresponded to a secondary running-in of the friction couple. The observed stages lasted for similar periods of time and ended with reaching the stabile level of temperature of the disc-pad contact surface.

Słowa kluczowe

EN

flake graphite; cast iron; brake discs; abrasive wear resistance; friction coefficient

PL

grafit płatkowy; żeliwo; tarcza hamulcowa; odporność na ścierania; współczynnik tarcia

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 16, iss. 4
• Strony: 196--200
• Opis fizyczny: Bibliogr. 12 poz., rys., tab., wykr.

Twórcy

autor

Orłowicz A. W.

• Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Mróz M.

• Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Wnuk G.

• Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Markowska O.

• Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Homik W.

• Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Kolbusz B

• Union Parts Sp. z o.o. Bobrowa Wola 72, 39-203 Nagoszyn, Poland

Bibliografia

• [1] Stawarz, M. (2008). Quality control of cast brake discs. Archives of Foundry Engineering. 8(1), 119-122.
• [2] Dudzik, B (2013). Characteristics of Brake Disc Castings Day by Day. Archives of Foundry Engineering. 13(spec.2), 35-38.
• [3] Wojciechowski, A., Rudnik, D., Pietrzak, K., Sobczak, J., Nowak, A. (2000). The new generation of brake discs and composite materials (Nowa generacja tarcz hamulcowych i materiałów kompozytowych). IV Seminar: Composite Theory and Practice (IV Seminarium: Kompozyty Teoria i Praktyka), Częstochowa, Poland, 180-190.
• [4] Stawarz, M. (2013). The influence of changing operating conditions associations friction disc brake - friction linings on the operating parameters (Wpływ zmiennych warunków eksploatacji skojarzenia ciernego tarcza hamulcowa - okładziny cierne na parametry pracy). Corrosion Protection (Ochrona przed korozją). 56(10), 449-452. (in Polish).
• [5] Podrzucki, Cz. (1991). Cast iron. Structure. Properties. Application (Żeliwo. Struktura. Właściwości. Zastosowanie). ZG STOP Kraków, T1 i T2. (in Polish).
• [6] Esposito, A., Thrower, J. (1999). Machine Design. Delmar Publishers Inc.
• [7] Murgaš, M., Pokusova, M. (2007). Graphitization inoculant for cast iron synthetic (Grafitizačné očkovadlo pre syntetickú liatinu). Proceedings of scientific papers VSB - Technical University of Ostrava (Sborník vědeckých prací Vysoké školy báňské – Technické university Ostrava), čislo 1, ročnik L, 173-178.
• [8] Aleksandric, D. & Duboka, C. (2007). Fade performance prediction of automotive friction materials by means of artificial neural networks. Wear. 262, 778-790.
• [9] Myshkin, N.K. (2000). Friction transfer film formation in boundary lubrication. Wear. 245, 116-124.
• [10] Eriksson, M., Bergman, F. & Jacobson, S. (2002). On the nature of tribological contact in automotive brakes. Wear. 252, 26-36.
• [11] Cho, M.H., Bae, E.G., Jang, H., Jeong, G., Kim, D, Choi, C. (2001). The role of raw material ingredients of brake linings on the formation of transfer film and friction characteristics. SAE paper 2001-01-3130.
• [12] Kim, S.J., Cho, M.H., Cho, K.H. & Jang, H. (2007). The role of raw material ingredients of brake linings on the formation of transfer film and friction characteristics. Tribology International. 40, 15-20.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.