Abstract
In this study, the influence of cutting speed and feed rate on surface integrity in Boring Trepanning Association (BTA) deep hole drilling of AISI 4140+QT is investigated. Microstructure and micro-hardness in the subsurface zones of bores are analyzed, using metallographic and micromagnetic methods. It was found that when using high feed rates and cutting speeds, white etching layers (WEL) form at the surface of the bores. These layers are up to three times harder than the substrate material and have a maximum thickness of approx.
Zusammenfassung
Der Einfluss der Schnittgeschwindigkeit und des Vorschubs auf die Oberflächenbeschaffenheit bei der Tiefbohrbearbeitung nach dem Boring and Trepanning Association (BTA) Verfahren von 42CrMo4+QT wurde untersucht. Die Mikrostruktur und Mikrohärte in der Bohrungsrandzone ließen sich mithilfe metallographischer und mikromagnetischer Verfahren analysieren und charakterisieren. Die Ergebnisse wurden in Relation zu den im Prozess auftretenden Kräften gesetzt. Es zeigte sich, dass sich beim Einsatz hoher Vorschübe und Schnittgeschwindigkeiten weiße Randschichten (engl. white etching layer, WEL) in der Bohrungsrandzone bilden. Diese Schichten weisen eine bis zu drei Mal höhere Härte als das Grundgefüge auf und Dicken von bis zu ca.
Funding source: Deutsche Forschungsgemeinschaft
Award Identifier / Grant number: 401539425
Funding statement: The authors would like to thank the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) for funding the depicted research “Process-integrated measuring and control system for the determination and reliable generation of functionally relevant properties in surface edge zones during BTA deep hole-drilling/Prozessintegriertes Mess- und Regelungssystem zur Ermittlung und sicheren Generierung von funktionsrelevanten Eigenschaften in Oberflächenrandzonen beim BTA-Tiefbohren” within the priority programme ‘SPP2086’ through project no. 401539425 (BI 498/96-1; WA 1672/45-1; ZA 427/5-1).
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