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Tool wear investigation in Cryogenic machining of Aluminium Metal Matrix Composite
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
2021 (engelsk)Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
Abstract [en]

Metal matrix composites have huge demand in the aerospace and automobile industry due to their unique characteristics. Aluminium metal matrix composites are preferred for their specific modulus. AC Floby is well known for its automotive components. Among them,the SiCAlight brake disc is a product whose material consists of reinforced silicon carbide in aluminium metal matrix composite. The SiCAlight brake disc, as the name suggests offers a lightweight brake disc and with low to almost zero brake dust compared to conventional cast iron. Aluminium silicon carbide is difficult to machine with excessive tool wear, which increases the production cost. In this work, the main goal is to investigate the effect of cryogenic machining on aluminium metal matrix composite. Experiments were carried out by machining the aluminium silicon carbide with 20%wt using an uncoated tungsten carbide insert. Four conditions were tested namely dry, flank, rake, and dual cooling (combination of rake and flank face cooling simultaneously). This work aimed to investigate in particular the effects of different cooling conditions on tool wear compared to dry machining condition. The results showed that the dry machining had less flank wear compared to other cooling conditions at all cutting speeds. Nevertheless, cryogenic flank cooling helps in the reduction of BUE height at higher cutting speeds. Further analysis was carried out to observe the wear mechanisms. It was found that dominant wear mechanisms are abrasion and adhesion. It was also concluded that the cooling effect doesn’t have an influence on wear mechanisms. Further study led to the finding that under given cutting conditions, cutting speed has more influence than the added external cooling using liquid nitrogen.

sted, utgiver, år, opplag, sider
2021. , s. 34
Emneord [en]
Aluminium MMC, Cryogenic cooling, tool wear
HSV kategori
Identifikatorer
URN: urn:nbn:se:hv:diva-17709Lokal ID: EXP800OAI: oai:DiVA.org:hv-17709DiVA, id: diva2:1609410
Fag / kurs
Mechanical engineering
Utdanningsprogram
Produktionsteknik, magister
Veileder
Examiner
Tilgjengelig fra: 2021-12-03 Laget: 2021-11-08 Sist oppdatert: 2021-12-03bibliografisk kontrollert

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