Approach for Implementation of Short Cycle Stretch Forming (SCS) to Cupping Processes

2014 ◽  
Vol 611-612 ◽  
pp. 1096-1101 ◽  
Author(s):  
Matthias Schneider ◽  
Mathias Liewald
Keyword(s):  
Metal Forming ◽  
Stretch Forming ◽  
Short Cycle ◽  
The University ◽  
Stretching Process

Short Cycle Stretch Forming (SCS) is a new stretching process patented by the Institute for Metal Forming (IFU) of the University of Stuttgart in 2006 [. It was mainly developed for outer car panels like doors [ and roofs [ with the aim of:

Batch Fluctuations in Short Cycle Stretch Forming of Tinplate can Bodies

2015 ◽  
Vol 794 ◽  
pp. 105-111 ◽  
Author(s):  
Matthias Schneider ◽  
Mathias Liewald
Keyword(s):  
Process Model ◽  
Tensile Tests ◽  
Stretch Forming ◽  
Short Cycle ◽  
Forming Technology ◽  
Metal Thickness ◽  
First Results ◽  
In Series ◽  
The University ◽  
Main Effects

Short cycle stretch forming (SCS) is an innovative stretch forming technology, developed by the Institute for Metal Forming Technology (IFU) at the University of Stuttgart. The SCS technology combines plane pre-stretching and deep drawing operations within the same stroke of the press ram. The sheet metal thickness is reduced, and the denting resistance as well as the yield stress are increased due to hardening effects.In this study, the SCS technology is applied to rotational-symmetric bodies. A process simulation of an SCS cupping process was carried out for producing tinplate cans. Based on these results, a tool was produced. First results showed that the metal thickness of cups for two-piece drawn and ironed (D&I) steel can bottoms can be reduced. With this technological goal, it is possible to save the material cost in series production.This paper analyses how batch fluctuations affect the thinning of cup bottoms in SCS cupping. Therefore, preliminary experiments have been conducted, using their results to improve the previously used FE process model. With the aid of this model, an FEA-based parametric study on the variation of material properties is conducted. To examine batch fluctuations, tensile tests have been taken into account, and initial material parameters for simulation, such as friction coefficient, initial blank thickness, Lankford parameter and hardening behaviour, have been varied.The results of this paper show that SCS cupping offers a promising potential for material savings and demonstrate the main effects of batch fluctuations.

Process Effects in Short Cycle Stretch Forming of Tinplate Can Bodies

2016 ◽  
Vol 716 ◽  
pp. 494-501
Author(s):  
Matthias Schneider ◽  
Mathias Liewald
Keyword(s):  
Research Work ◽  
Tool Geometry ◽  
Stretch Forming ◽  
Serial Production ◽  
Short Cycle ◽  
Forming Technology ◽  
Metal Thickness ◽  
Process Effects ◽  
The University ◽  
Main Effects

Short Cycle Stretch Forming (SCS) is an innovative stretch forming technology developed at the Institute for Metal Forming Technology (IFU) at the University of Stuttgart. The SCS technology combines plane pre-stretching of blank and subsequent deep drawing operations within the same stroke of press ram. The sheet metal thickness is reduced while denting resistance and yield stress increases due to hardening effects.Current research work focuses on applying SCS-technology to rotational-symmetrical bodies. A process simulation for SCS-Cupping process was performed for food cans. Based on these results a tool was manufactured and commissioned. The results showed that the thickness of cup bottoms of two-piece drawn and ironed (D&I) steel cans can be reduced. Therefore, it is possible to save material costs in serial production based on a reduced blank diameter.In this paper the different effects leading to the thinning of steel can bottom and failure types, such as, wrinkling and cracking are observed in a number of experimental series. Based on these results, the tool geometry was optimized and an advanced tool was manufactured. The results of this paper show that SCS-Cupping offers promising potential to save material, as well as outlining the main effects for this technology.

Fließpressen hohler Wellen mit Wanddickenvariation/Cold forging of hollow shafts with wall thickness variation – Numerical investigation of a hollow forward extrusion process with adjustable deformation zone

2020 ◽  
Vol 110 (10) ◽  
pp. 684-688
Author(s):  
Alexander Weiß ◽  
Mathias Liewald
Keyword(s):  
Numerical Investigation ◽  
Metal Forming ◽  
Extrusion Process ◽  
Cold Forging ◽  
Thickness Variation ◽  
Part Geometry ◽  
Forming Technology ◽  
Wall Thickness Variation ◽  
The University ◽  
Hollow Shafts

Die Fertigung von Hohlwellen mit komplexer Innengeometrie bedingte bisher meist aufwendige Prozessrouten. Ein am Institut für Umformtechnik der Universität Stuttgart entwickeltes Kaltfließpressverfahren soll nun die wirtschaftliche und flexible Fertigung von Hohlwellen mit Wanddickenvariation ermöglichen. In diesem Beitrag werden das Verfahren beschrieben und die Ergebnisse der numerischen Untersuchung des Einflusses der Werkzeugkinematik auf die erzielbare Pressteilgeometrie dargelegt.   Usually, the production of hollow shafts with complex internal geometry by cold forging requires extensive process routes. A novel cold forging process developed at the Institute for Metal Forming Technology at the University of Stuttgart allows for an economical and flexible production of hollow shafts. This article describes the manufacturing process and presents the results of a numerical investigation for determining the influence of tool kinematics on the achievable part geometry.

Benchmarking Methods for Short Cycle Stretch-Forming

2008 ◽  
Vol 1 (S1) ◽  
pp. 193-196
Author(s):  
D. Vlahovic ◽  
M. Liewald
Keyword(s):  
Stretch Forming ◽  
Short Cycle

Numerical Simulation of the Effect of Punch Paths on the Quality of Sheet Metal Stretch Forming

2012 ◽  
Vol 217-219 ◽  
pp. 2002-2005
Author(s):  
Chang Jiang Wang ◽  
Diane J Mynors ◽  
Tarsem Sihra
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Finite Element Modelling ◽  
Metal Strip ◽  
Stretch Forming ◽  
Forming Quality ◽  
Element Modelling

Presented here is the simulation of uniaxial stretch forming using two punches in a sheet metal forming operation. In the finite element modelling, the sheet metal strip was held by two bank holders and two punches are able to move in two directions to stretch the sheet metal. Due to the friction between the punch and sheet metal, it was found that friction affects the sheet metal forming quality, however by adopting an optimal punch path the effect of friction in sheet metal forming can be reduced. The effect of punch paths on the quality of the sheet metal are also reported in this paper.

scholarly journals Methods for online measurement and control of section deviations during hot rolling of wire rod and bars

2021 ◽  
Author(s):  
Christian Overhagen ◽  
Rolf Braun ◽  
Rüdiger Deike
Keyword(s):  
Metal Forming ◽  
Rolling Mill ◽  
Process Model ◽  
Rolling Process ◽  
Online Measurement ◽  
Wire Rod ◽  
Influencing Parameters ◽  
Roll Gap ◽  
The University ◽  
Velocity Mismatch

In the joint project PIREF, the metal forming group of the University of Duisburg-Essen has collaborated with the University of Applied Sciences Ruhr-West Mülheim (Ruhr), the University of Siegen, EMG Automation GmbH and SMS group GmbH to develop sensors, for an online measurement of material velocity and cross section as well as control models for the rolling process of wire rod and bars. The University of Duisburg-Essen provided a metal forming process model for the rolling process to assess the influencing parameters on the rolled section precision. A technique was found to segregate height- from width- influencing parameters from a measured cross-sectional area and actual roll gap. With this measuring technology and with help of the process model, rules for control of the rolling process to achieve close tolerances were obtained. The modelling was accompanied by rolling trials on a laboratory rolling mill at the University of Duisburg-Essen, where a typical Round-OvalRound pass sequence was used for validation of the rolling model concerning lateral spread, inlet and outlet velocity as well as rolling force and torque calculation. The present paper shows how the material flow and the distribution of the velocity in the roll gap can be described. In subsequent rolling of bar and rod in a continuous rolling mill the dimensions can be influenced by application of longitudinal stresses and screwdown. The application of stress can be achieved by an inter-stand velocity mismatch. With the developed models the necessary velocity mismatch can be calculated.

Fügen von Aluminium- und Kohlenstofffaserstrukturen*/Joining of aluminium and carbon fibre structures - An innovative joining technology based on semi-solid forming strategies

2017 ◽  
Vol 107 (10) ◽  
pp. 743-747
Author(s):  
M. Prof. Liewald ◽  
L. Marx
Keyword(s):  
Carbon Fibre ◽  
Metal Forming ◽  
Carbon Fabric ◽  
Forming Technology ◽  
Joining Technology ◽  
Aluminium Sheets ◽  
Semi Solid ◽  
The University ◽  
The Impact

Das Institut für Umformtechnik (IFU) an der Universität Stuttgart befasst sich derzeit mit der Entwicklung eines neuartigen Verfahrens zum formschlüssigen Fügen von Aluminium- und Carbonstrukturen. Zwei Aluminiumbleche werden dabei lokal auf ein Temperaturniveau knapp oberhalb ihrer Solidustemperatur erwärmt, sodass ein dazwischenliegendes Carbongewebe durch die dann teilflüssige Aluminiummatrix infiltriert werden kann. Dieser Fachartikel befasst sich mit dem Einfluss wichtiger Prozessparameter.   The Institute for Metal Forming Technology (IFU) of the University of Stuttgart aims at the development of a novel joining method for combining aluminium and carbon fibre structures. Two aluminium sheets with carbon fabric in between are conductively heated by two electrodes up to semi-solid state, so the woven carbon fabric is infiltrated with aluminium. This paper focuses on the impact of different process and sample parameters on the quality of the joint.

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