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Materialoptimering för diskar i en centrifug
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Under detta kandidatexamensarbete i lättkonstruktioner har en studie i huruvida det är möjligt att reducera vikten hos en centrifug genomförts. Centriair AB var projektets uppdragsgivare och Jack Delin var industrihandledare under hela processen.

Centrifugen som viktreducerades används inom friteringsbranschen och innehåller 200-250 tunna diskar som roterar 3000 varv per minut. Diskarnas uppgift är att separera oljepartiklar från vattendroppar genom att slunga dessa mot de inre väggarna i centrifugen med hjälp av centrifugalkraften som uppstår vid rotationen. Viktreduktionen uppnåddes genom att byta material på diskarna till ett kompositmaterial med en polymermatris samt genom att minska tjockleken på varje individuell disk. Applikationen var kostnadskänslig och krävde material med höga temperaturtoleranser. Enligt uppdragsgivarens önskemål behölls originaldesignen på disken och endast materialval samt tillverkningsmetoder undersöktes.

Till en början sammanställdes en kravspecifikation till applikationen. Utifrån kravspecifikationen genomfördes en litteraturstudie där matris- och fibermaterial samt tillverkningsmetoder undersöktes. En FEM-analys genomfördes på disken för att beräkna de belastningar som uppstår utifrån de material som valdes i litteraturstudien. Parallellt med detta genomfördes ett antal prover för att verifiera de mekaniska egenskaperna hos materialet.

LCP med glasfiber valdes till den slutgiltiga materialkombinationen och kompositen ska tillverkas med formpressning. Vikten reducerades till 63 gram, vilket gav en viktreduktion på ungefär 77 % per disk. Materialkostnaden uppskattades till 5 kr per disk.

Abstract [en]

A study regarding the possibility to reduce the weight of a centrifuge was made as a Bachelor thesis in lightweight constructions. Centriair AB contributed with the assignment and Jack Delin was involved as supervisor during the entire project.

The centrifuge is used in the frying industry and in each centrifuge there are 200-250 thin discs rotating at 3000 rpm. Their primary function is to separate oil particles from water by hurling the oil particles to the inner walls of the centrifuge by using the centrifugal force. The weight reduction was obtained by changing the disc material to a composite with a polymer matrix and also by making each disk thinner. The application was cost sensitive and required materials with very high temperature tolerance. Since the supervisor did not want the design to change, the original design was used and therefore only material and manufacturing methods was analyzed.

At first, a requirement specification to the application was made. From this, an analysis was made where matrix and fiber material as well as manufacturing methods were investigated. A FEM-analysis was performed to calculate the stress developed in the centrifuge by using data from the investigated materials. Parallel to the analysis, quality tests were performed to verify the mechanical properties in the chosen material.

The ultimate material choice was LCP as matrix together with glass fiber and the composite will be manufactured using compression moulding. The weight was reduced to 63 gram, a weight reduction of nearly 77 % per disc. The material cost was estimated to 5 SEK per disc.

Place, publisher, year, edition, pages
2015. , 106 p.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-173485OAI: oai:DiVA.org:kth-173485DiVA: diva2:853167
Supervisors
Available from: 2015-09-11 Created: 2015-09-11 Last updated: 2015-09-11Bibliographically approved

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