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Ermittlung der Verschleißursachen beim Spanen von Vermikularguss

Ermittlung der Verschleißursachen beim Spanen von Vermikularguss

          
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About the Book

Diplomarbeit aus dem Jahr 2001 im Fachbereich Ingenieurwissenschaften - Maschinenbau, Note: 1.7, Gottfried Wilhelm Leibniz Universität Hannover, Sprache: Deutsch, Abstract: Im Rahmen dieser Arbeit wird das Verschleißverhalten verschiedener Schneidstoffe mit unterschiedlichen Werkzeuggeometrien bei der Zerspanung von Gusseisen mit Vermikulargraphit untersucht. Die Zerspanversuche werden im Außenlängsdrehen von GJV600 unter Variation der Schnittgeschwindigkeit durchgeführt. Es erfolgt eine Analyse der während des Bearbeitungsprozesses auftretenden Zerspankraftkomponenten, eine Betrachtung von REM-Aufnahmen der Spanflächen, eine Analyse der Elementverteilungen auf den Spanflächen mit dem EDX-System sowie eine Untersuchung von Diffustonensvorgängen mit der Mikrosonde. Zur Beurteilung der Spanbildung und des Einflusses der Bearbeitung auf die Werkstückrandzone werden Spanwurzeln erzeugt. Eine Ermittlung der Temperaturen in der Spanfläche erfolgt beim Orthogonal-Einstechdrehen von GJV550 und einem Vergleichswerkstoff GJL250. Gute Standwege können mit Werkzeugen aus Aluminiumoxidkeramik und aus beschichtetem Hartmetall erreicht werden. Dabei ist beschichtetes Hartmetall eher für konventionelle Schnittgeschwindigkeiten geeignet, während Aluminiumoxidkeramik im Bereich der Hochgeschwindigkeitszerspanung einsetzbar ist. Durch das Verrunden der Schneidkante wird die erreichbare Schnittlänge von Werkzeugen aus Al2O3 weiter erhöht. Der Verschleiß wird verursacht durch hohe mechanische bzw. abrasive Belastungen aufgrund der Inhomogenität des Werkstoffgefüges und der Graphitmorphologie unter-stützt durch die Schwächung der Schneidstoffe durch hohe Temperaturen beim Zerspanprozess und tribochemische Reaktionen bzw. Diffusionen, die wegen der fehlenden Ausbildung einer Sulfidschicht zwischen Werkzeug und Werkstoff ablaufen können. Außerdem kommt es zu einer mit der Schnittgeschwindigkeit ansteigenden Erhöhung der Mikrohärte in der plastisch verformten Randzone der Werkstücke. Bei


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Product Details
  • ISBN-13: 9783867468077
  • Publisher: Examicus Publishing
  • Publisher Imprint: Examicus Publishing
  • Height: 210 mm
  • No of Pages: 156
  • Series Title: German
  • Weight: 213 gr
  • ISBN-10: 3867468079
  • Publisher Date: 19 Mar 2012
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 9 mm
  • Width: 148 mm


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