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

This paper presents the importance of simulation of metal flow in deep drawing process which employs an antilock brake mechanic system. Controlling the force and friction of the blank holder is imperative to assure that the sheet metal is not locked on the blank holder, and hence it flows smoothly into the die. The simulation was developed based on the material displacement, deformation and deep drawing force on flange in the radial direction, that it is controlled by blank holder with antilock brake mechanic system. The force to blank holder was applied periodically and the magnitude of force was kept constant during simulation process. In this study, the mechanical properties of the material were choses such that they equivalent to those of low carbon steel with its thickness of 0.2 mm. The diameter and the depth of the cylindrical cup-shaped product were 40 mm and 10 mm, respectively. The simulation results showed that the application of antilock brake mechanic system improves the ability to control the material flow during the drawing process, although the maximum blank holder force of 13000 N was applied. The optimum condition was found when the drawing process was performed using blank holder force of 3500 N, deep drawing force of 7000 N, friction coefficient of 0.25 and speed of punch stroke of 0.84 mm/sec. This research demonstrated that an antilock brake mechanic system can be implemented effectively to prevent cracking in deep drawing process.

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Blank holder force optimisation strategy in deep drawing process

International Journal of Computational Materials Science and Surface Engineering ◽

10.1504/ijcmsse.2007.014873 ◽

2007 ◽

Vol 1 (2) ◽

pp. 226 ◽

Cited By ~ 2

Author(s):

Hossam H. Gharib ◽

Abdalla S. Wifi ◽

Maher Y.A. Younan ◽

Ashraf O. Nassef

Keyword(s):

Deep Drawing ◽

Drawing Process ◽

Blank Holder Force ◽

Blank Holder ◽

Deep Drawing Process

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Study of the Parameters of Deep Drawing Process Based on the Simulation of Dynaform

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.51 ◽

2012 ◽

Vol 249-250 ◽

pp. 51-58

Author(s):

Qing Wen Qu ◽

Tian Ke Sun ◽

Shao Qing Wang ◽

Hong Juan Yu ◽

Fang Li

Keyword(s):

Friction Coefficient ◽

Sheet Metal ◽

Deep Drawing ◽

Drawing Process ◽

Blank Holder Force ◽

Blank Holder ◽

Deep Drawing Process ◽

Drawing Die ◽

Drawing Speed

A simulation of deep drawing process on the sheet metal was done by using Dynaform, the influence of blank holder force, deep drawing speed and friction coefficient on the forming speed of sheet metal in the deep drawing process were got. The forming speed of sheet metal determines the quality of deep drawing, in the deep drawing process the blank holder force and the deep drawing speed are controllable parameters, the friction coefficient can be intervened and controlled, and it’s a manifestation of the interaction of all parameters, the main factors which influence the friction coefficient just have blank holder force, deep drawing speed and lubrication except the material. The conclusion of this study provides the basic data for the analysis of the lubrication of mould, the study of lubricant and the prediction of the service life of deep drawing die.

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Effect of Blank Holder Force with Low Frequency Vibration Technique in Circular-Cup Deep-Drawing Using AZ31 Magnesium Alloy Sheet

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.2785 ◽

2011 ◽

Vol 383-390 ◽

pp. 2785-2789

Author(s):

Naoki Horiike ◽

Shoichiro Yoshihara ◽

Yoshitaka Tsuji ◽

Yusuke Okude

Keyword(s):

Deep Drawing ◽

Low Frequency ◽

Lubricating Oil ◽

Drawing Process ◽

Blank Holder Force ◽

Forming Process ◽

Blank Holder ◽

Deep Drawing Process ◽

Low Frequency Vibration ◽

Friction Performance

In the deep-drawing process, the application of low-frequency vibration to the blank material has recently been focused on with the aim of improving the friction performance between the die and the blank material. A servo-controlled press machine is suitable for applying low-frequency vibration to the blank during the deep-drawing process, because the punch speed and blank holder force (BHF) are easily controlled as process parameters by using the servo motors. In this study, a BHF with low-frequency vibration was proposed as a technique for improving deep-drawability, which is mainly affected by the friction performance and the lubricant condition. We found that the friction performance between the blank surface and the blank holder was decreased in the case of a BHF with low-frequency vibration since the lubricating oil rapidly flowed into the clearance during the forming process. Furthermore, for a BHF with low-frequency vibration, the punch force and the deformation resistance were lower than those in a deep-drawing test without low-frequency vibration.

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Deep Drawing Height Analysis of Rectangular Cup Drawing

Volume 3: Design and Manufacturing, Parts A and B ◽

10.1115/imece2010-39999 ◽

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.

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