Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Improvement in the forming process of support brackets vulnerable to cracking: Problem solving in the field of  sheet metal forming
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This report has been written to summarize my work, regarding a will to improve the manufacturing process of a support bracket used for cable ladders. The company concerned in the project have experienced several problems with severe cracking in a flange radius throughout the years of production. The main task has therefore been to identify the problem and to come up with some suggestions of how to avoid these issues ahead.  In order to evaluate the formability of the material used in production, flanging tests have been performed accompanied by finite element analysis in MSC Marc. The conditions of the cut edge subjected to cracking, as well as the cutting tool, have also been investigated by light optical microscopy (LOM), as well as by scanning electron microscopy (SEM).  The results show that the flanging operation in today's production of support brackets extensively exceeds the critical flanging ratio of the steel sheet material. As sheet material tends to adhere to the tool surfaces, issues due to galling can also be stated during manufacturing. In order to improve the production with respect to reliability and a more enhanced product, the company should consider solutions like changing the lubricant or focus on the options of applying a surface treatment on the cutting tool or a brand new tool made from high-quality steel grades, which should be a more sufficient solution in the long-term run.

Abstract [sv]

Denna rapport har skrivits för att sammanfatta mitt arbete med syfte att förbättra tillverkningen av bärok som används till kabelstegar. Det i projektet berörda företaget har under årens lopp upplevt ett flertal problem med svår sprickbildning i en kragad radie. Huvuduppgiften har därför varit att identifiera vad som skulle kunna vara problemet, samt att komma fram till några förslag på hur dessa problem skulle kunna undvikas framöver.   Kragningstest, åtföljda av finita element analyser med hjälp av MSC Marc har utförts för att utvärdera arbetsmaterialets formbarhet. Skicket på den berörda klippkanten, liksom klippverktyget, har också studerats i såväl ljusoptiskt mikroskop (LOM) som svepelektronmikroskop (SEM).   Resultaten visar att kragningsoperationen i dagsläget avsevärt överskrider materialets kritiska kragningsförhållande. Problem med galling kan också fastställas då plåtmaterial tenderar att smeta fast på verktygsytorna under produktionsförloppet. För att förbättra tillverkningen med avseende på tillförlitlighet och en förbättrad produkt, bör företaget överväga lösningar såsom att byta smörjmedel eller att fokusera på en ytbehandling av klippverktyget eller att investera i ett helt nytt verktyg tillverkat av högkvalitativt verktygsstål vilket antagligen skulle vara den mest fördelaktiga lösningen på lång sikt.

Place, publisher, year, edition, pages
2013. , 44 p.
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-132377OAI: oai:DiVA.org:kth-132377DiVA: diva2:659793
External cooperation
Schneider Electric – Wibe, AB
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2013-10-28 Created: 2013-10-28 Last updated: 2013-10-28Bibliographically approved

Open Access in DiVA

fulltext(9066 kB)1006 downloads
File information
File name FULLTEXT01.pdfFile size 9066 kBChecksum SHA-512
6a09a41a02abebf9a93380ae629ec9e234561ab13b1948b99b50b3d44754849fe3bf0aa7b997d6e9d80ecba4b82764e94b831944227a49a9bb332216cccffc2d
Type fulltextMimetype application/pdf

By organisation
Materials Science and Engineering
Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1006 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 352 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf