1 / 18

Extrusion of nickel–titanium alloys Nitinol to hollow shapes

Extrusion of nickel–titanium alloys Nitinol to hollow shapes . Author: K. Müller Presenter: Joshua Furner Date: 16 September 2009. Function of Paper. Describe results of hot extrusion of NiTi alloys Development of extrusion principles for NiTi alloys . References.

geordi
Télécharger la présentation

Extrusion of nickel–titanium alloys Nitinol to hollow shapes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Extrusion of nickel–titanium alloys Nitinol to hollow shapes Author: K. Müller Presenter: Joshua Furner Date: 16 September 2009

  2. Function of Paper • Describe results of hot extrusion of NiTi alloys • Development of extrusion principles for NiTi alloys

  3. References • 1. D. Stöckel, et al., LegierungenmitFormgedächtnis: Grundlagen-Werkstoffe-Anwendungen, Kontakt & Studium, Band 259, Expert VerlagRenningenMalmsheim, 1988. • 2. D. Stöckel, Formgedächtnis und Pseudoelastizität von Nickel–Titan-Legierungen. Metall.41 (1987), p. 5. • 3. H.-P. Kehrer and H. Nußkern, Erhöhungderumwandlungstemperatur von formgedächtnis-elementendurchkonstruktivemaßnahmen. Metall.46 (1992), p. 7. • 4. T.W. Duerig, A.R. Pelton and D. Stöckel, The use of superelasticity in medicine. Metall.50 (1996), p. 9. • 5. W. Thedja and K. Müller, Strangpressen von superelastischenNiTi-Legierungen. Metall.52 (1998), p. 12. • 6. K. Mueller, Grundlagen des Strangpressens, Expert VerlagRenningenMalmsheim, 1995. ISBN 3-8169-1071-8. • 7. K. Mueller, E. Hellum, Indirect tube extrusion of dispersion strengthened aluminum, in: Proceedings of the Third World Congress on Aluminum, Aluminum 2000, Limassol, Cyprus, April 15–19, 1997. • 8. L. Tillmann, K. Müller, W. Thedja, H. Nußkern, Massivumformung von Nickel–Titan, einWerkstoffmitaußergewöhnlichenEigenschaften, in: NeuereEntwicklungen in derMassivumformung, 1999, MAT INFO Werkstoff-Informations-Gesellschaft. ISBN 3-88355-282-8.

  4. Technical details • This paper discusses the extrusion process of a material with high deformation resistance • Consideration is taken in material selection for die design • Comparison of Direct and Indirect methods

  5. Parameters • Friction force • Die force • Ram displacement • Extrusion ratio • Deformation resistance • Temperature

  6. Deformation resistance • Specific Extrusion Pressure • Extrusion Ratio

  7. Design Principle • Indirect extrusion used because of reduced friction forces • High affinity between NiTi and steel results in welding • Cu canning of NiTi billet protects against this • Copper chosen because of its similar deformation properties at high temperature

  8. Indirect extrusion

  9. Billet Preparation

  10. Design Principles applied • Extrusion of composite billet results in 2 nested tubes when copper is chemically removed

  11. Data/tables/design discussed

  12. Fig. 4. Force–displacement diagrams with — FG: total force; indirect extrusion (right); FM: die force; direct extrusion (left); FR: friction force.

  13. Fig. 5. Deformation resistance kW of NiTi as a function of the billet temperature TB.

  14. Fig. 6. Specific extrusion pressure Pspec of NiTi in relation to the extrusion ratio lnV.

  15. Fig. 7. Deformation resistance kWC of NiTi/CuCr versus core fraction Vcore of CuCr.

  16. Fig. 9. Limits for indirect tube extrusion with a moving mandrel.

  17. Other design consideration

  18. Technical Advancement and industrial impact • Innovative solution to shaping NiTi alloys

More Related