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

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

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.

Item Type: Conference or Workshop Item
Erschienen: 2013
Creators: Heß, Benjamin and Übelacker, David and Groche, Peter
Title: Numerical Investigation On The Force Reduction In Axial Forming By Oscillating Ram Movement
Language: English
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.

Place of Publication: Kyoto, Japan
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institut für Produktionstechnik und Umformmaschinen (PtU)
Event Title: Proceedings of the 6th JSTP International Seminar on Precision Forging
Date Deposited: 03 Jun 2013 11:21
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