Investigation into the wrinkling behaviour of thin sheets in the cylindrical cup deep drawing process using bifurcation theory

2003 ◽  
Vol 56 (12) ◽  
pp. 1673-1705 ◽  
Author(s):  
J. B. Kim ◽  
J. W. Yoon ◽  
D. Y. Yang
Keyword(s):  
Deep Drawing ◽  
Bifurcation Theory ◽  
Drawing Process ◽  
Thin Sheets ◽  
Deep Drawing Process ◽  
Cylindrical Cup

Deep Drawing Height Analysis of Rectangular Cup Drawing

2010 ◽  
Author(s):  
Francisco J. Colorado Alonso ◽  
Hugo I. Medelli´n Castillo ◽  
Pedro de J. Garci´a Zugasti ◽  
Dirk F. de Lange
Keyword(s):  
Deep Drawing ◽  
Theoretical Expression ◽  
Drawing Process ◽  
Trial And Error ◽  
Contact Conditions ◽  
Deep Drawing Process ◽  
The Past ◽  
Theoretical And Numerical Analysis ◽  
Cylindrical Cup ◽  
Cup Drawing

The deep drawing process is widely used in industry because it allows the production of parts with reduced weight and good mechanical properties. However, the deep drawing process of non-cylindrical shapes still relies on experimental and trial and error methods, leading to high costs and long development times. The deformation mechanism of non-cylindrical cup drawing is theoretically very complex because of the large elasto-plastic stress and strain, and contact conditions between the tools and the sheet metal involved. In particular, several attempts have been tried in the past to perform theoretical and numerical analysis of rectangular cups. This paper presents an analysis of the allowable deep drawing height (DDH) of rectangular cups. The aim of this paper is twofold: 1) to analyze and estimate the allowable DDH of rectangular parts using theoretical, numerical (FEM) and experimental methods, and 2) identify the theoretical expression that predicts with the highest accuracy the allowable DDH of rectangular parts. A new theoretical expression for predicting this DDH is also proposed. To perform the study FEM is used together with the experimental data from industrial parts. The results show the accuracy of each theoretical expression in predicting the allowable DDH of rectangular parts.

scholarly journals 2111 Study on Effect of Blank Holder Gap on Cylindrical Cup Deep Drawing Process

2010 ◽  
Vol 2010.20 (0) ◽  
pp. _2111-1_-_2111-5_
Author(s):  
Jirasak Srirat ◽  
Koetsu Yamazaki ◽  
Satoshi Kitayama
Keyword(s):  
Deep Drawing ◽  
Drawing Process ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Cylindrical Cup

Experimental Study of the Small Lubrication Holes on the Die Shoulder on the Formability in Cylindrical Cup Deep-Drawing

2010 ◽  
Vol 37-38 ◽  
pp. 428-431
Author(s):  
Yu Qing Shi
Keyword(s):  
Deep Drawing ◽  
Mechanical Characteristics ◽  
Experimental Methods ◽  
Sheet Forming ◽  
Drawing Process ◽  
Forming Process ◽  
Deep Drawing Process ◽  
Forming Quality ◽  
Forming Technology ◽  
Cylindrical Cup

Wrinkling and tearing are major defects that usually occur in the deep-drawing process. This study presents a new sheet forming technology, together with machining small lubrication holes on the die shoulder. Deep drawing process of cylindrical cups with flange is investigated. Mechanical characteristics of die shoulder with small lubrication holes in deep drawing are analyzed. Numerical simulation and experimental methods are used to determine the influence on formability of machining small lubrication holes on the die shoulder. The results show that this new sheet forming process can improve formability and forming quality.

Numerical Simulation in Deep Drawing of Cylindrical Cup with Circular Diving Equally Small Holes on Edge of Circle Blank

2010 ◽  
Vol 148-149 ◽  
pp. 769-773
Author(s):  
Yu Qing Shi
Keyword(s):  
Sheet Metal ◽  
Deep Drawing ◽  
Metal Forming ◽  
Failure Modes ◽  
Small Hole ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Blank Shape ◽  
Cylindrical Cup ◽  
Small Holes

Deep-drawing is one of the most important methods to form sheet metal ,but wrinkling and fracture are the main failure modes in sheet-metal forming. Blank shape is important for deep-drawing because of an effective way to promote deep formability sheet metal .This paper presents an attempt to determine the effect of circle blank with circular diving equally small hole on edge of circle blank on the fracture and wrinkling and was investigated using 08Al sheet metal .The circular blank with small hole of diameter = was analyzed to eliminate wrinkling and fracture in deep-drawing .The aim of this study is to investigate the circular diving equally small hole on edge of circle blank on formability in the deep-drawing process and to obtain useful date from the industrial field .The experiment show that limit formability promote with punching small holes on circle blank in deep-drawing process.

Numerical Simulation in Deep Drawing of Cylindrical Cup with Elliptical Shape Die Shoulder

2010 ◽  
Vol 148-149 ◽  
pp. 1355-1359
Author(s):  
Yu Qing Shi ◽  
Ai Zhi Guan
Keyword(s):  
Sheet Metal ◽  
Deep Drawing ◽  
Metal Forming ◽  
Failure Modes ◽  
Major Axis ◽  
Minor Axis ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Elliptical Shape ◽  
Cylindrical Cup

Wrinkling and tearing are the main failure modes in sheet-metal forming. The radius of die is important for deep-drawing because of an effective way to promote deep formability sheet metal .This paper presents an attempt to determine the effect of various elliptical shape die shoulder on the fracture and wrinkling and was investigated using 08Al sheet metal .The ellipse with minor axis of b=4.5mm and major axis of a=6.5mm,a=7mm,a=8mm ,a=10mm were analyzed to eliminate wrinkling and fracture in deep-drawing .The aim of this study is to investigate the effect of elliptical major axis and elliptical minor axis variables in elliptical shape die shoulder on formability in the deep-drawing process and to obtain useful date from the industrial field .The experiment show that limit formability promote with elliptical shape die shoulder in deep-drawing process.

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