Paper Title:
Sheet Hemming with Rolling Tools: Analysis and Optimization of the Part Quality
  Abstract

The present paper is the continuation of a research conducted on hemming operations by using rolling tools. Sheet hemming is a joining operation widely used in automotive industry when it is necessary to join two sheet parts (such as the engine hood or the door panels with their internal frame) by plastic deformation of the edge of the outer part. The whole process is characterised by a 90° sheet flanging, a pre-hemming (up to approximately 135°) and the final hemming where the outer sheet edge is bended up to 180° clamping the inner sheet. Hemming processes are normally performed using rigid dies in series production and manually in pre-series and small batch production, due to the high cost of the dies. Nowadays, rollers moved by robots are becoming an interesting alternative to the manual operations especially when flexible productions are required. Even if the process time is higher, this solution can help in minimizing set-up times and costs. The required equipments are a support and a blocking system for the sheets together with the rollers mounted on a CNC machine or on a robot. The production flexibility is guaranteed by changing the 3D tool path using a CAD/CAM system. Authors are dealing with this technique having conducted many experiments studying the influence of the hemming process parameters such as flange geometry (edge height, fillet radius), distance of the inner panel from the flange, tool path sequence, along straight paths on steel sheets. The goal of the present research is to study the material behaviour and the produced parts quality when working on aluminium sheets. In particular, both experimental tests and simulations will be carried out in order to optimize the process.

  Info
Periodical
Main Theme
Edited by
F. Micari, M. Geiger, J. Duflou, B. Shirvani, R. Clarke, R. Di Lorenzo and L. Fratini
Pages
357-364
DOI
10.4028/www.scientific.net/KEM.344.357
Citation
E. Ceretti, A. Attanasio, A. Fiorentino, C. Giardini, "Sheet Hemming with Rolling Tools: Analysis and Optimization of the Part Quality", Key Engineering Materials, Vol. 344, pp. 357-364, 2007
Online since
July 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Gang Fang, P. Zeng
Abstract:Fine blanking process with V-ring was simulated with FEM. The geometric parameters of the die, the punch, the serrated ring and the sheet are...
603
Authors: Komgrit Lawanwong
Abstract:Bending process is an important process in the metal sheet forming in many industries. The main problem of the bending process is the...
2864
Authors: Mohamed Mohamed, David Carty, John Storr, Nicola Zuelli, Paul Blackwell, David Savings
Chapter 8: Numerical Analysis and Modelling
Abstract:The application of finite element method (FEM) in the area of metal forming and material processing has significantly increased in the recent...
685