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Undersökning av materialegenskaper för nytt segjärn i jämförelse med traditionellt
University West, Department of Engineering Science, Division of Mechanical Engineering.
University West, Department of Engineering Science, Division of Mechanical Engineering.
2013 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Material properties for a new ductile iron in comparisonwith conventional ductile iron (English)
Abstract [sv]

I denna rapport beskrivs en undersökning och jämförelse av två olika sorters segjärn. Detvå materialen som har studerats har varit det segjärnet som används i Parker Hannifinsnuvarande hydraulikmotorer och ett nytt segjärn, vars mekaniska egenskaper har påståttsvara mer fördelaktiga. Målet med arbetet var att få fram en tillförlitlig jämförelse av de olikamaterialen och avgöra om det fanns ett tydligt underlag för att inleda processen av ett byteav material i vissa komponenter i Parker Hannifins produkter.Det utfördes jämförelser mellan de olika materialens mekaniska egenskaper baserade delspå information som redan fanns om materialen och dels på data insamlad vid tester medskärande bearbetning. Förslitning på verktygen vid fräsning studerades tillsammans medskärkraften med olika sorters skärdata. Restspänningar efter ingreppen i de båda materialenmättes med en röntgendiffraktometer.Resultaten gav inga signifikanta indikationer på att ett materialbyte skulle innebära en lägreproduktionskostnad, dock visade analyser att det nya materialet tål att bearbetas fortare ändet traditionella segjärnet och att fler undersökningar bör göras. Efter att ha analyseratmekaniska egenskaper så som hållfasthet, hårdhet, hårdhetsspridning och styvhet kundeslutsatser dras. Det visade sig att det nya segjärnet hade högre hållfasthet och jämnarehårdhet, men det hade även lägre styvhet. Styvheten i materialet är en viktig faktor dåläckage kan uppstå i hydraulikmotorer om materialen inte har tillräckligt hög styvhet.Mätningarna av skärkraften hos de båda materialen tydde på att det kunde uppstå högrestandardavvikelse, eller variationer av skärkraften vid fräsning av det traditionella segjärnet.Eftersom dessa variationer endast visade sig ett fåtal gånger går det inte att entydigtkonstatera att det nya materialet har mer fördelaktiga bearbetningsegenskaper. För att draen sådan slutsats hade det krävts ytterligare analyser på fler detaljer.

Abstract [en]

This report describes a study and comparison of two different types of ductile iron. Thetwo materials that have been studied have been the ductile iron used in Parker Hannifin'scurrent hydraulic motors and a new ductile iron, whose mechanical properties are said tobe more advantageous. The goal of this study was to obtain a reliable comparison of thedifferent materials and determine if there were clear grounds for initiating the process of achange of material in certain components of Parker Hannifin’s products.Comparisons between the mechanical properties of the materials were based partly oninformation that was already available and partly on data collected through machining trails.The wear on the tools after milling was studied along with the cutting force from variouskinds of cutting data. Residual stresses after the operation in both materials were measuredby an X-ray diffractometer.The results yielded no significant indication that a change of material would result in lowerproduction cost, however, analyses showed that the new material can withstand beingprocessed faster than the traditional ductile iron and that more studies should beconducted. After analyzing the mechanical properties, such as strength, hardness, hardnessvariation and stiffness, conclusions could be drawn. It turned out that the new ductile ironhad higher strength and more uniform hardness, but it also had lower stiffness. Thestiffness of the material is an important factor because if the materials do not havesufficient rigidity, leakage can occur in hydraulic motors. Measurements of the cutting forceof the two materials indicated that there could be a higher standard deviation, orfluctuation of the cutting force during milling of the traditional ductile iron. Since thesevariations only appeared a few times, it is difficult to conclude that the new ductile ironwould be more advantageous when it comes to machining. To be able to draw that kind ofconclusion would require more collected data.

Place, publisher, year, edition, pages
2013. , 21 p.
Keyword [en]
Ductile iron, Microstructure, Cast iron, Parker, Hydraulics, GJSF, Milling, Machining
Keyword [sv]
Segjärn, Mikrostruktur, Gjutjärn, Parker, Hydraulik, GJSF, Fräsning, Bearbetning
National Category
Engineering and Technology Materials Engineering
Identifiers
URN: urn:nbn:se:hv:diva-5348OAI: oai:DiVA.org:hv-5348DiVA: diva2:623255
Subject / course
Mechanical engineering
Educational program
Maskiningenjör
Presentation
2013-04-11, Trollhättan, 15:30 (Swedish)
Supervisors
Examiners
Available from: 2013-06-10 Created: 2013-05-26 Last updated: 2013-06-10Bibliographically approved

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Undersökning av materialegenskaper för nytt segjärn i jämförelse med traditionellt(11767 kB)508 downloads
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Citation style
  • apa
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  • modern-language-association-8th-edition
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More styles
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  • de-DE
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  • sv-SE
  • Other locale
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Output format
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