Cold Sizing of Cold- and Hot-Formed Gears

authored by: B. A. Behrens, E. Doege
Abstract: Today's markets require industrial forgers to manufacture complex near net shape or net shape parts at minimum unit costs. One way of meeting this challenge is to combine a cold or hot forming process with a subsequent cold sizing process in order to achieve the desired tolerances. In this context, a closed-die cold sizing process of a straight-toothed planetary gear has been investigated in terms of the occurring elastic die deflection which is a threat to accuracy in this and any other cold forming process. Two strategies have been employed to minimize the elastic die deflection. The first strategy consists in a correction of the die cavity's tooth profile based on the finished part's deviation from its theoretical shape determined through Finite-Element-Analysis (FEA). The key idea underlying the second strategy is an innovative tooling concept which compensates the elastic die deflection by means of a counter pressure generated by an elastomer ring embedded in the lower die. The advantages of this active concept have been confirmed in numerical and experimental investigations.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Article
Journal: CIRP Annals - Manufacturing Technology
Volume: 53
Pages: 239-242
No. of pages: 4
ISSN: 0007-8506
Publication date: 2004
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Mechanical Engineering, Industrial and Manufacturing Engineering
Electronic version(s): https://doi.org/10.1016/S0007-8506(07)60688-X (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{d041f9c4d16b424f9451484bab6100e0,
title = "Cold Sizing of Cold- and Hot-Formed Gears",
abstract = "Today's markets require industrial forgers to manufacture complex near net shape or net shape parts at minimum unit costs. One way of meeting this challenge is to combine a cold or hot forming process with a subsequent cold sizing process in order to achieve the desired tolerances. In this context, a closed-die cold sizing process of a straight-toothed planetary gear has been investigated in terms of the occurring elastic die deflection which is a threat to accuracy in this and any other cold forming process. Two strategies have been employed to minimize the elastic die deflection. The first strategy consists in a correction of the die cavity's tooth profile based on the finished part's deviation from its theoretical shape determined through Finite-Element-Analysis (FEA). The key idea underlying the second strategy is an innovative tooling concept which compensates the elastic die deflection by means of a counter pressure generated by an elastomer ring embedded in the lower die. The advantages of this active concept have been confirmed in numerical and experimental investigations.",
keywords = "Cold sizing process, Forming, Gear",
author = "Behrens, {B. A.} and E. Doege",
year = "2004",
doi = "10.1016/S0007-8506(07)60688-X",
language = "English",
volume = "53",
pages = "239--242",
journal = "CIRP Annals - Manufacturing Technology",
issn = "0007-8506",
publisher = "Elsevier USA",
number = "1",
}