Zusammenfassung
In den letzten Jahrzehnten haben neue höchstfeste Stähle in der Verwendung von Auto-Karosserien zur Verringerung des Fahrzeuggewichts und zur Verbesserung der Insassensicherheit eine zunehmende Verbreitung gefunden. Derartige Stähle stellen aber auch steigende Anforderungen an die zu ihrer Verarbeitung notwendigen Werkzeuge. Diese Arbeit beschäftigt sich mit dem Verschleißverhalten verschiedener Werkzeugstähle in unterschiedlichen Wärmebehandlungs- und Beschichtungsvarianten beim Schneiden eines CP1000 unter praxisnahen Schnittbedingungen. Zur Verschleißcharakterisierung wurden tastende, optische und elektronenoptische Mess- und Prüfmethoden herangezogen. Mit Ausnahme eines niedriger legierten, oberflächengehärteten Kaltarbeitsstahles konnten stets 100.000 Testschnitte mit guter Schnittqualität erreicht werden, obwohl ein teilweises Ausbrechen der Schneide bei allen Werkzeugen festgestellt wurde. Die besten Ergebnisse, insbesondere hinsichtlich Zinkauftrag an der Schneide, wurde mit den beschichteten Werkzeugen erzielt.
Abstract
During the last decade, AHSS (Advanced High Strength Steels) have received growing attention in the construction of light-weight car bodies with excellent crash-performance. With the rising strength of these materials, the requirements for forming and cutting tools are also increasing permanently. To investigate the tool performance for such conditions, four different cold work tool steels (1.2379 – Sverker21, Sleipner, 1.2358 – Carmo and Caldie), one of them (1.2379 – Sverker21) additionally PVD-coated, were used in their typical heat treatment condition to compare the wear behavior and the cutting performance. The tests were performed on semi-industrial forming and cutting press under industrial process parameters on partially preformed test pieces of the steel CP1000. The measurement methods applied include optical as well as tactile measurement methods to measure the tool wear, optical methods to investigate the cutting zone and the burr formation at the workpiece as well as scanning electron-microscopy to characterize the tool surface regarding wear, fracture and adhesion of the zinc coating. Except for the lower alloyed surface hardened and nitride tool steel (1.2358 – Carmo), which showed early failure, all other tooling solutions easily reached 100,000 test pieces with good workpiece quality. Nevertheless, small partial fracturing at the cutting edge was found at all tools. Best results regarding wear, but especially lowest zinc adhesion were found at the PVD-coated tools.
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References
Spenger, F., T. Hebesberger, A. Pichler, C. Krempaszky and E. Werner: AHSS Steel Grades: strain hardening and damage as material design criteria. Int. Conf. on New Developments in Advanced High-Strength Sheet Steels. Orlando 15.-18. June 2006, p. 39–49
Pichler, A., T. Hebesberger, S. Traint, E. Tragl, T. Kurz, C. Krempazky, P. Tsipouridis and E. Werner: Advanced high strength thin sheet grades: improvement of properties by microalloying assisted microstructural control. Proc. of the Int. Symposium on Niobium Microalloyed Sheet Steel for Automotive Application. Araxa 5.-8. Dez. 2005, TMS 2006, p. 245–273
Tragl, E., A. Pichler, S. Traint und T. Hebesberger: AHSS, eine Chance und Herausforderung für die Stahlindustrie. Unterlagen zur Tagungsreihe Dünnblechverarbeitung – Neues aus der Serienfertigung. München 5.-6. Mai 2004, S. 189–200
Högman, B.: Steels for press tools – blanking of ultra high strength steel sheet. Proc. of the 6th Int. Tooling Conf. "The Use of Tool Steels: Experience and Research". Karlstad University, 10.-13. Sept. 2002, p.203–216
Escher, C., and T. Henke: New trends in thin coatings for sheet-metal forming tools. Proc. of the 6th Int. Tooling Conf. "The Use of Tool Steels: Experience and Research". Karlstad University, 10.-13. Sept. 2002, p.771–738
Casas, B., D. Marco and I. Valls: Tool steels for shaping AHSS. Proc. of the 7th Int. Tooling Conf. "Tooling materials and their applications from research to market" – Vol. I. Politecnico di Torino 2.-5. May 2006, p. 45–52
Viale, D., P. Jousserand, G. Baron, E. Grosset and M. Gomez: Optimization of stamping tools to process very high strength steels; Comparison of cold work tool steel lifetimes. Proc. of the 8th Int. Tooling Conf. "Tool Steels – Deciding Factors in Worldwide Production". RWTH Aachen University, 2.-4- June 2009, p. 55–69
Sandberg, A., and A. M. Nzotta: High performance matrix tool steels produced via a clean steel concept. Proc. of the 7th Int. Tooling Conf. "Tooling materials and their applications from research to market" – Vol. II. Politecnico di Torino, 2.-5. May 2006, p. 409–415
Uddeholms AB, Brochures and data sheets of the corresponding steel grades, (2005–2007)
Kirchhartz, T.: Verschleißuntersuchungen beim Scherschneiden von hochfesten Stahlblechen. Abschlussbericht, Forschungsgesellschaft Umformtechnik, Stuttgart (2004), 97 Seiten
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Schneckenleitner, J., Schneider, R., Rabler, G. et al. Performance of Different Tool Steels for the Cutting of an CP1000 Advanced High Strength Steel. Berg Huettenmaenn Monatsh 156, 105–111 (2011). https://doi.org/10.1007/s00501-011-0635-6
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DOI: https://doi.org/10.1007/s00501-011-0635-6