Quality control of cast brake discs

• Autorzy: Stawarz M.
• Języki publikacji: EN

Abstrakty

EN

The largest industrial application so far have the gray cast irons which are characterized by low tensile and bending strength, while at the same time they have good ultimate comprehensive strength. Additionally, the fatigue strength of gray cast irons is comparatively low and they are only to some extend sensitive for the surface waters effects. Cast iron is the material, which is comparatively easy to be processed, and for this reason - it is not expensive. Brake discs are exploited in particularly hard conditions. They must be resistant both against the thermal fatigue and abrasion wearing (at dry friction) as well as against seizing, corrosion and mechanical load [1-3]. The gray cast iron, better than other materials, fulfills all the requirements necessary for making the material for the casts resistant against such tough conditions. This work reflects the researches aiming to define the quality of cast brake discs (ventilated and non-ventilated ones) upon a period of their exploitation in real conditions. The following researches were performed: evaluations of the disc surface condition, measurement of disc thickness, examination of run - out flank and metallographic analysis. In order to more detailed recognition of mechanisms and reasons of brake discs wearing in real conditions, one should conduct additional examinations: computer analysis of the microstructure, chemical composition analysis, etc., as well as study of the technology of their production in foundries, where they are manufactured [4]. By obtaining the full set of the mentioned above data one can draw final conclusions and remove causes of possible defects.

Słowa kluczowe

EN

brake discs; cast iron; quality control

PL

odlewy motoryzacyjne; tarcza hamulcowa; żeliwo; kontrola jakości

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2008
• Tom: Vol. 8, iss. 1
• Strony: 119--122
• Opis fizyczny: Bibliogr. 8 poz., rys., fot.

Twórcy

autor

Stawarz M.

• Politechnika Śląska, Zakład Odlewnictwa, 44-100 Gliwice, ul. Towarowa 7,

Bibliografia

• [1] C Podrzucki, Cast iron, vol. 1 and 2, ZG STOP Kraków 1991 (in Polish)
• [2] E. Fraś, M. Górny, H. F. Lopez, Graphite nodule and cell count in cast iron. Archives of Foundry Engineering, No.3, vol. 7, 2007, 47-52
• [3] F. Bińczyk, J. Szymszal, A. Smolinski, IX-MR control chart as a tool in assessment of the cast iron properties stability, Archives of Foundry Engineering, No.3, , vol. 7, 2007, 25-28
• [4] G. Janik, Cast brake disks - the analysis of wearing reasons, Engineer's work, Gliwice 2007 (in Polish)
• [5] J. Sobczak, Aluminium brakes disc and brake drum. From idea to industry. Foundry - Science and Practice, Kraków, No 1, 2003, 10-20 (in Polish)
• [6] Polish Standard - European Standard PN-EN ISO 945 Cast iron - designation of microstructure of graphite, Polish Committee for Standardization, January 1999 (in Polish)
• [7] M.Durand - Charre, Microstructure of steels and cast iron, e-book, New York 2004
• [8] A. W. Orłowicz, A. Trytek, Effect of rapid crystallization on intensity of frictional wear of iron castings, Archives of Foundry, No.1 (2/2), vol. 1, 2001, 271-282 (in Polish)