Prediction of the maximum drawing load in the cup-drawing process of sheet metals

1997 ◽  
Vol 72 (2) ◽  
pp. 256-261 ◽  
Author(s):  
Daw-Kwei Leu
Keyword(s):  
Drawing Process ◽  
Sheet Metals ◽  
Cup Drawing

Production of Tapered Cups by Sequential Deep Drawing of Sheet Metals Using Drawn Cups as a Part of Punch

1993 ◽  
Vol 115 (2) ◽  
pp. 224-229 ◽  
Author(s):  
K. Yamaguchi ◽  
K. Kanayama ◽  
M. H. Parsa ◽  
N. Takakura
Keyword(s):  
Deep Drawing ◽  
Drawing Ratio ◽  
Drawing Process ◽  
Sheet Metals ◽  
Deep Drawing Process ◽  
Drawing Method

A new deep drawing process of sheet metals is developed to facilitate small-lot production of deep cups with large drawing ratio. In this process, unlike the conventional deep drawing method, a few drawn cups are always stacked on the punch and used as a part of punch for the subsequent deep drawing of a given blank. Before drawing a new blank, a drawn cup which is in contact with the punch is stripped off. The repetition of such stripping and drawing operations makes it possible to carry out both the first-stage drawing and the subsequent slight redrawings in one drawing operation using only one pair of punch and die. In this paper, this new deep drawing process is applied to the production of tapered cups and the main feature of the process is shown.

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.

Cup-drawing from a Flat Blank: Part I. Experimental Investigation

1951 ◽  
Vol 165 (1) ◽  
pp. 199-211 ◽  
Author(s):  
S. Y. Chung ◽  
H. W. Swift
Keyword(s):  
Experimental Investigation ◽  
Drawing Ratio ◽  
Drawing Process ◽  
Low Carbon ◽  
Deep Drawing Process ◽  
Comparative Tests ◽  
Descriptive Account ◽  
Nominal Capacity ◽  
Die Profile ◽  
Cup Drawing

Part I gives an account of an experimental investigation of the forces, work and strains involved, and the conditions for successful drawing of a cylindrical shell from a flat circular blank. It is claimed that the results are sufficiently accurate to provide a basis of reference for theoretical treatments of cup-drawing, as well as an empirical basis of comparison between different drawing conditions. The work was carried out in an experimental crank-press of 50 tons nominal capacity, and was based on a cup diameter of 4 inches. Blank thicknesses from 0·025 to 0·060 inch were used, and although most of the work was carried out on a low-carbon rimming steel, comparative tests were made with aluminium, brass, and copper, of different tempers. The conditions examined included methods of blank-holding, drawing ratio, punch and die profile radii, punch-die clearance, and blank thickness. Although this part has no theoretical pretensions, it includes a descriptive account of stresses and strains in the deep-drawing process, based on plastic theory.

On the benefits of a stress criterion for the simulation of cup drawing process

2016 ◽  
Vol 10 (5) ◽  
pp. 707-716 ◽  
Author(s):  
Yann Jansen ◽  
Roland E. Logé ◽  
Pierre-Yves Manach ◽  
Gabriel Carbuccia ◽  
Marc Milesi
Keyword(s):  
Drawing Process ◽  
Stress Criterion ◽  
Cup Drawing

Experimental Determination of Anisotropic Properties and Evaluation of FLD for Sheet Metal Operations

2021 ◽  
Vol 106 ◽  
pp. 39-45
Author(s):  
Araveeti C. Sekhara Reddy ◽  
B. Sandeep ◽  
J. Sandeep Kumar ◽  
B. Sanjanna
Keyword(s):  
Deep Drawing ◽  
Grain Orientation ◽  
Forming Limit Diagram ◽  
Experimental Tests ◽  
Rolling Process ◽  
Forming Limit ◽  
Drawing Process ◽  
Sheet Metals ◽  
Deformation Models

Most of the sheet metals in general exhibit high an-isotropic plasticity behavior due to the ordered grain orientation that occurred during the rolling process. This results in an uneven deformation yield property that tends to develop ears in case of deep-drawing operation. The deep drawing process is used for the production of cup-shaped articles having applications in automobiles, beverages, home appliances etc. It is essential to know the formability of sheet metals for minimisation of test runs and reducingthe defects. Forming Limit Diagram (FLD) is one of the methods for assessment of formability of sheetmetals. This paper describes various deformation models, yielding and an-isotropic properties and itsdetermination. Through experimental tests, FLD constructed for aluminium alloy AA6111 sheet metalhaving 0.9 mm thickness.

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