Effects of Vibration on the Blank Holder in Cup Drawing

Investigations on Cylindrical Cup Drawing with Boundary and Hydrostatic Lubrication Conditions in Blank - Blank Holder Interfaces

Journal for Manufacturing Science and Production ◽

10.1515/ijmsp.2007.8.2-4.137 ◽

2007 ◽

Vol 8 (2-4) ◽

pp. 137-144

Author(s):

N. Saravanakumar, ◽

R. Marappan,

Keyword(s):

Blank Holder ◽

Cylindrical Cup ◽

Cup Drawing ◽

Lubrication Conditions

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Optimum Blank Shapes for Prismatic Cup Drawing—Consideration of Friction and Material Anisotropy

Journal of Manufacturing Science and Engineering ◽

10.1115/1.2830128 ◽

1998 ◽

Vol 120 (2) ◽

pp. 306-315 ◽

Cited By ~ 8

Author(s):

Sy-Wei Lo ◽

Jing-Yeong Lee

Keyword(s):

Slip Line ◽

Material Flow ◽

Source Term ◽

Present Theory ◽

Computational Effort ◽

Interfacial Friction ◽

Material Anisotropy ◽

Blank Holder ◽

Blank Shape ◽

Cup Drawing

A theory employing the concept of potential flow and an easily implemented numerical method are developed. It can offer a preliminary prediction of the optimum blank shape with a little computational effort. The effects of the material anisotropy and the interfacial friction between the workpiece and blank holder on the material flow can be modeled by superimposing a “sink” or “source” term in the potential field. Variations in the cup wall thickness are considered. Both convex and non-convex punch profiles are studied. Generally speaking, the contours of the present theory are smoother than the solutions from the slip-line method. The discrepancy of the optimum blank contours between the plane strain and anisotropic cases is more significant for polygon and irregular cup drawing. The influence of friction on the optimum blank contour is not negligible.

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Deep Drawing With Blank Holder Force Approximately Proportional to the Punch Force

Journal of Engineering for Industry ◽

10.1115/1.2899587 ◽

1990 ◽

Vol 112 (3) ◽

pp. 278-285 ◽

Cited By ~ 31

Author(s):

S. Thiruvarudchelvan ◽

W. G. Lewis

Keyword(s):

Deep Drawing ◽

Present Method ◽

Pressure Variation ◽

Experimental Investigations ◽

Optimum Conditions ◽

Blank Holder Force ◽

Punch Force ◽

Blank Holder ◽

Blank Holding Force ◽

Cup Drawing

A new method of applying blank holding force approximately proportional to the punch force in cup drawing is presented. An annular urethane pad compressed between two parts of a punch expands and applies pressure against the tubular part of a blank holder. As the punch moves to draw the blank, friction between the urethane pad and the blank holder applies automatically a blank holding force approximately proportional to the punch force. Experimental investigations were carried out with aluminum blanks to determine the optimum conditions to obtain wrinkle-free cups. Variations of the punch force and the blank holding force with punch stroke for aluminum blanks under different degrees of wrinkling are presented. Strains on the cup wall measured with this method are presented and compared with those obtained under constant blank holding force conditions. Theoretical critical blank holding pressure variation with punch stroke is compared with the pressure variation that obtains with the present method. Using the deep drawing theory an expression to predict the punch force with this method is also presented.

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Adaptive FEM simulation for prediction of variable blank holder force in conical cup drawing

International Journal of Machine Tools and Manufacture ◽

10.1016/j.ijmachtools.2003.11.001 ◽

2004 ◽

Vol 44 (5) ◽

pp. 487-494 ◽

Cited By ~ 77

Author(s):

Z.Q Sheng ◽

S Jirathearanat ◽

T Altan

Keyword(s):

Fem Simulation ◽

Blank Holder Force ◽

Blank Holder ◽

Variable Blank Holder Force ◽

Adaptive Fem ◽

Cup Drawing

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The Prediction of Earing and the Design of Initial Shape of Blank in Cylindrical Cup Drawing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.532-533.865 ◽

2006 ◽

Vol 532-533 ◽

pp. 865-868 ◽

Cited By ~ 3

Author(s):

Tung Sheng Yang ◽

Yuan Chuan Hsu

Keyword(s):

Finite Element ◽

Deep Drawing ◽

Fem Simulation ◽

Drawing Process ◽

The Finite Element Method ◽

Element Analysis ◽

Initial Shape ◽

Blank Holder ◽

Cylindrical Cup ◽

Cup Drawing

The parameters such as aniotropic property, blank holder force and friction coefficient between tool and blank are not only effect on the forming force, stress and strain distribution of the worpiece, but also on the earing in products. In this paper, the finite element method is used to investigate the earing of the deep drawing process. In order to verify the prediction of FEM simulation of the earing in the cylindrical cup drawing process, the experimental data are compared with the results of the current simulation. A finite element analysis is also utilized to reduce the earing profile of the drawn products, a reverse forming method for obtaining the initial blank’s shape according to the forward cup deep drawing simulation is proposed.

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Cup Drawing from an Anisotropic Blank

Journal of Engineering for Industry ◽

10.1115/1.3591687 ◽

1969 ◽

Vol 91 (3) ◽

pp. 766-771 ◽

Cited By ~ 5

Author(s):

W. A. Mir ◽

M. J. Hillier

Keyword(s):

Hydrostatic Pressure ◽

Drawing Ratio ◽

Blank Holder ◽

Limiting Drawing Ratio ◽

Cup Drawing ◽

Good Agreement

Tests on aluminum, copper and brass blanks indicate that, provided proper hold-down methods are used, the limiting drawing ratio that can be obtained is almost independent of type of blank holder. A comparison of theoretical and experimental critical punch loads at failure shows that, for aluminum, good agreement can be obtained when drawing under all-round hydrostatic pressure. This method produces a reduction in die friction and a significant increase in limiting drawing ratio. There is an optimum hydrostatic pressure above which no advantage is to be obtained.

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