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Eliminering av finplaning vid tillverkning av axiallager
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
2020 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Elimination of the secondary face grinding process while manufacturing thrust bearings (English)
Abstract [sv]

I dagens verkstadsindustri ställs ständigt högre krav på samtliga processer genom skärpta toleranser och att aktivt arbeta med att reducera ledtid, kostnader, samtidigt som produktkvalitén inte får påverkas negativt. De vanligaste tillverkningsmetoderna inkluderas i området skärande bearbetning. För att bemöta de högre ställda kraven ökas materialavverkningshastigheten (MRR) genom att öka skärdata, skärhastighet, matning och skärdjup. Detta medför risker gällande kvalitet eftersom skärkrafterna ökar.

I detta arbete har påverkan från skärdata på arbetsstycket studerats genom att undersöka hur ytterbrickor till axiallager deformeras till följd av skärkrafter under en hårdsvarvningsprocess. Studien genomfördes i syfte att kartlägga hur skärdata påverkar deformationernas beteende och skapa underlag för att driva framtida projekt där programmeringen optimeras för att minimera uppkomsten av deformationer. Det långsiktiga målet var att eliminera finplaningsprocessen av brickorna som i dagsläget är nödvändig eftersom deformationerna från bearbetningsprocesserna blir större än vad toleranserna tillåter.

Studien genomfördes genom en kartläggning där brickor av olika storlekar mättes före och efter hårdsvarvningsprocessen. Deformationerna studerades genom att mäta toleranssatta mått för rakheten och skevheten hos det ytterbrickornas breda plan. En referensgrupp skapades genom att mäta brickor under normal produktion utan några skärdataförändringar. Därefter testades förändringar av skärhastighet, matning och skärdjup.

Vid analys av studiens resultat visas inga säkra kopplingar mellan påverkan från skärdata och storleken på deformationen som uppstår under hårdsvarvningsprocessen. Vid tillverkningen används skärverktyg enligt rekommendationer för material och process. Bearbetningen sker med relativt hög matning jämfört med verktygstillverkarens rekommendationer för arbetsstyckets material. Vidare studier för att undersöka påverkan från skärdata bör genomföras för att stärka den statistiska trovärdigheten.

Abstract [en]

Today's striving manufacturing business leads to higher demands concerning tolerances, cost reduction and lead time for all processes. The demands must be fulfilled without any negative influence on the product quality. The most common manufacturing methods are categorised under machining in the form of material removal. To fulfil the demands, producers implement higher material removal rates (MRR) which is controlled by the cutting data cutting speed, feed rate and depth of cut. The implementation of higher MRR result in higher risks for issues concerning quality due to the increased cutting forces.

This study focuses on the deformations that occur during the production of outer rings for spherical thrust bearings in a hard-turning process. The deformations are believed to be caused by cutting forces that can be altered by the programmed cutting data such as cutting speed, feed rate and depth of cut. The purpose of the study was to define the behaviour and pattern of the deformations and if they could be controlled by a change of cutting data. The results would act as a mapping of problem and give a clue of the influence that the cutting data have on the magnitude of the deformations. The results would also benefit future projects where the programming of turning process can be optimized to minimize the deformations. The long-term goal is to eliminate the secondary face grinding process that is currently necessary to ensure that the demands concerning tolerances are fulfilled.

The study was performed by mapping the behaviour and pattern of the deformations using measurement data before and after the turning process. The deformations were studied by measuring the straightness and skewness of the widest plane on the outer rings. A reference group was created by performing measurements without the implementation of any changes concerning cutting data. Testing was accomplished by implementing changes to three different cutting data in the programming. The changes that were made was adjustment of cutting speed, feed rate and depth of cut.

The analysis of the results does not show any certain connection between the cutting data and the magnitude of the deformation that occurs. The manufacturing process uses cutting tools recommended for the specific material and operation. The manufacturing process uses a relatively high feed rate considering the specific material type. Further studies concerning cutting data should be completed to improve the statistical credibility.

Place, publisher, year, edition, pages
2020. , p. 39
Keywords [en]
Machinng, hard turning, adi turning, residual stress, turning, deformations, deformation
Keywords [sv]
Skärande bearbetning, svarvning, restspänningar, hårdsvarvning, deformationer
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hv:diva-15760Local ID: EXM502OAI: oai:DiVA.org:hv-15760DiVA, id: diva2:1462830
Subject / course
Mechanical engineering
Educational program
Maskiningenjör
Supervisors
Examiners
Available from: 2020-09-01 Created: 2020-08-31 Last updated: 2020-09-01Bibliographically approved

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