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Numerical Investigation On The Force Reduction In Axial Forming By Oscillating Ram Movement

Heß, Benjamin ; Übelacker, David ; Groche, Peter :
Numerical Investigation On The Force Reduction In Axial Forming By Oscillating Ram Movement.
In: Proceedings of the 6th JSTP International Seminar on Precision Forging. Kyoto, Japan
[Konferenz- oder Workshop-Beitrag], (2013)

Kurzbeschreibung (Abstract)

The forming limits in conventional forming of longitudinal toothings are usually restricted due to high forming forces which lead to buckling. Using an oscillating ram movement can reduce the required forming force up to 40 . This leads, amongst others, to an extension of the forming limits and enables e.g. the forming of toothings with smaller wall thickness. The reason for the reduction of the forming force is not clarified yet. Two theories are encountered in literature: One is the “friction theory” which attributes the force reduction to the rebuilding of the lubricating film during the back stroke. On the other hand the “softening theory” attributes the force reduction to softening effects like the Bauschinger-Effect due to the alternating load when using oscillating ram motion. Thus, in this paper both of these theories are numerically investigated as a major cause of the force reduction. By changing the material laws as well as the friction laws and friction coefficients, significant changes in the forming force can be measured in the numerical simulation.

Typ des Eintrags: Konferenz- oder Workshop-Beitrag (Keine Angabe)
Erschienen: 2013
Autor(en): Heß, Benjamin ; Übelacker, David ; Groche, Peter
Titel: Numerical Investigation On The Force Reduction In Axial Forming By Oscillating Ram Movement
Sprache: Englisch
Kurzbeschreibung (Abstract):

The forming limits in conventional forming of longitudinal toothings are usually restricted due to high forming forces which lead to buckling. Using an oscillating ram movement can reduce the required forming force up to 40 . This leads, amongst others, to an extension of the forming limits and enables e.g. the forming of toothings with smaller wall thickness. The reason for the reduction of the forming force is not clarified yet. Two theories are encountered in literature: One is the “friction theory” which attributes the force reduction to the rebuilding of the lubricating film during the back stroke. On the other hand the “softening theory” attributes the force reduction to softening effects like the Bauschinger-Effect due to the alternating load when using oscillating ram motion. Thus, in this paper both of these theories are numerically investigated as a major cause of the force reduction. By changing the material laws as well as the friction laws and friction coefficients, significant changes in the forming force can be measured in the numerical simulation.

Ort: Kyoto, Japan
Fachbereich(e)/-gebiet(e): Fachbereich Maschinenbau
Fachbereich Maschinenbau > Produktionstechnik und Umformmaschinen
Veranstaltungstitel: Proceedings of the 6th JSTP International Seminar on Precision Forging
Hinterlegungsdatum: 03 Jun 2013 11:21
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