New Generation of Brake Callipers to Improve Competitiveness and Energy Savings in Very High Performance Cars

Abstract:

This paper concerns with the optimisation of the innovative rheocasting process to produce a new generation of brake callipers, characterised by very high reliability and strength. The attained very promising properties favoured their use on a very high performance car and the presented technique can be further extended for other important challenging applications. The prototype components are produced using T6 heat treated A357 alloy. Results on the samples machined directly from the produced callipers are in detail described and analysed. Pieces exhibiting some small defects, individuated by non-destructive tests, as well as defectless pieces have been underlined to severe industrial tests, e.g. high pressure tight, as well as severe bench tests, and it has been observed that the proposed technological process assure the fulfilment of the requirements contained in standards.

• Periodical: Solid State Phenomena (Volumes 217-218)
• Pages: 471-480
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.217-218.471
• Online since: September 2014
• Authors: Ivano Gattelli, Gian Luigi Chiarmetta, Marcello Boschini, Renzo Moschini, Mario Rosso*, Ildiko Peter
• Keywords: A357 Aluminum Alloy, Brake Callipers, Energy Saving, Rheocasting

References

[1] Campbell F.C., Manufacturing technology for aerospace structural materials. Elsevier; (2006).

[2] Warren A.S., Developments and challenges for aluminium – A Boeing perspective. Mater Forum 2004, 28 p.24–31.

[3] Blanco M.I., The economics of wind energy. Renewable and Sustainable Energy Reviews 2009, 13, pp.1372-1382.

DOI: 10.1016/j.rser.2008.09.004

[4] Atkinson H.V. , Liu D. , (2008) Microstructural coarsening of semi-solid aluminium alloys, Materials Science and Engineering A, Volume 496, 1-2, 25, pp.439-446.

DOI: 10.1016/j.msea.2008.06.013

[5] Barnes H., (1997) Thixotropy – a review, Journal of Non-Newtonian Fluid Mechanics, 70, p.1–33.

[6] Cetin, A., Kalkanli, A., (2009) Investigation of microporosity formation mechanisms in A356 aluminium alloy castings, International Journal of Microstructure and Materials Properties , Vol. 4, No. 3, pp.377-385.

DOI: 10.1504/ijmmp.2009.031143

[7] Curle U. A., Govender G., (2010), Semi-solid rheocasting of grain refined aluminum alloy 7075, Transaction of nonferrous metals. Society of China 20, pp.832-836.

DOI: 10.1016/s1003-6326(10)60590-0

[8] Rosso M. , Peter I., Villa, R., (2008), Effects of T5 and T6 heat treatments applied to rheocast A356 parts for automotive applications, Journal of Solid State Phenomena Vol. 141-143, pp.237-242.

DOI: 10.4028/www.scientific.net/ssp.141-143.237

[9] Rosso M., Peter I., New frontiers for thixoforming, International Journal of Microstructure and Materials Properties, Vol. 8, Issue 1-2, 2013, pp.113-124.

[10] Zhen Z., Ma Qian, Ji S., Fan Z., The effects of rheo-diecasting on the integrity and mechanical properties of Mg–6Al–1Zn, , Scripta Materialia 54 (2006), 207-211, ISSN 1359-6462.

DOI: 10.1016/j.scriptamat.2005.09.032

[11] Kaufmann H., Wabusses H., Uggowitzer J., Aspects of the NRC semi-solid casting technology, Journal of Metallurgical and processing Technology, vol. 76, no1-2, pp.70-75.

[12] Rosso, M., Peter, I., Chiarmetta, G., Gattelli, I., (2010).

[13] Rosso M., Peter I., Chiarmetta G., Gatelli I., Extremely light weight rheocast components for auto motive, Diffusion and Defect Data Pt. B: Solid State Phenomena 192-193, 2012, pp.545-550.

DOI: 10.4028/www.scientific.net/ssp.192-193.545

[14] Moschini R., Molina R., Production of hollow components in high pressure die casting through the use of ceramic cores,. HTDC, Vicenza Feb (2012).

[15] Campbell J., Castings2nd edn, p.443–452; 2003, Oxford, Butterworth-Heinemann.

[16] Campbell J., Casting practice; 2004, Oxford, Butterworth Heinemann.