Eccentric rotary swaging

Cold forming processes are very efficient for bulk production. However, the achievable geometries are restricted not only by the process kinematics and tools but also by work hardening. Especially with metastable austenitic steels higher deformation degrees cannot be achieved due to the deformation...

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Bibliographic Details
Published inInternational journal of precision engineering and manufacturing Vol. 18; no. 7; pp. 1035 - 1041
Main Authors Ishkina, Svetlana, Schenck, Christian, Kuhfuss, Bernd, Moumi, Eric, Tobeck, Kiron
Format Journal Article
LanguageEnglish
Published Seoul Korean Society for Precision Engineering 01.07.2017
Springer Nature B.V
Subjects
Alloys
Austenite
Austenitic stainless steels
Cold working
Deformation
Dies
Eccentricity
Engineering
Formability
Forming
Industrial and Production Engineering
Kinematics
Martensite
Martensitic stainless steels
Martensitic transformations
Materials Science
Photomicrographs
Regular Paper
Rotary swaging
Shear deformation
Straightness
Swaging
Tensile tests
Work hardening
Workpieces
Cold forging
Rotary swaging
Eccentric process
Material properties
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Summary:Cold forming processes are very efficient for bulk production. However, the achievable geometries are restricted not only by the process kinematics and tools but also by work hardening. Especially with metastable austenitic steels higher deformation degrees cannot be achieved due to the deformation induced martensitic transformation of austenite which leads to an even higher hardening of the workpieces. To adjust the forming characteristics (formability, microstructure) a rotary swaging process is adapted in the way that higher shear deformation is applied. In the new approach a shift of the axial centerline of the workpiece from the original center of the closed dies is realized. It leads to non-symmetric material flow during each stroke and in combination with the rotation of the swaging head a helical deformation of the original center line of the workpiece is achieved. The center line in the sense of straightness is restored by robust guiding. Forming tests were performed with AISI304. The resulting material properties are illustrated by tensile tests, martensite content measurements and micrographs.
ISSN:2234-7593
2005-4602
DOI:10.1007/s12541-017-0122-4