Effect of reverse pre-bulging on magnetic medium deep drawing formability of aluminum spherical bottom cylindrical parts

With physical experiments and numerical simulation about semi-ball bottom cylindrical parts and flat-bottomed cylindrical parts, we got the thinning law about spherical bottom of semi-ball bottom cylindrical parts, and got forming limit height difference of semi-ball bottom cylindrical parts and flat-bottomed cylindrical parts under the same conditions. In accordance with the principle of constant volume, the cylindrical ball height of semi-ball bottom cylindrical parts can be converted to draw from the cylindrical part height of the flat-bottomed cylindrical parts, which introduced a method of calculating the forming limit height of semi-ball bottom cylindrical parts. Through practical examples, this algorithm is feasible.

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Blank Shape Optimization in Deep Drawing with Combined Restraint

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.371.178 ◽

2013 ◽

Vol 371 ◽

pp. 178-182

Author(s):

Viorel Paunoiu ◽

Virgil Teodor

Keyword(s):

Numerical Simulation ◽

Deep Drawing ◽

Degree Of Deformation ◽

Initial Blank ◽

Mathematical Relation ◽

Blank Shape Optimization ◽

Cylindrical Parts ◽

Blank Shape ◽

High Degree

One of the methods for increasing the degree of deformation in the deep drawing of the cylindrical parts is the method with the combined restraint. In this process, due to the high degree of deformation, the earing is pronounced and affects the quality of the final part. The paper focuses in optimization the blank shape in this process applying a method which combines a mathematical relation with the results of the numerical simulation. The mathematical relation connects the radii of the initial blank at the different angles with the sizes of the part heights at different angles. The numerical simulation using FEM was used for the heights determination at the main anisotropy directions considering different initial blank dimensions. An experimental work was done for certify the numerical results. The results confirmed that the optimization of the blank shape in deep drawing with the combined restraint is a key for improving the deformation process, for reduction the earing and for minimizing the material consumption.

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The analysis of the parameters for deep drawing of cylindrical parts

MATEC Web of Conferences ◽

10.1051/matecconf/201817802011 ◽

2018 ◽

Vol 178 ◽

pp. 02011

Author(s):

Dan Chiorescu ◽

Esmeralda Chiorescu ◽

Sergiu Olaru

Keyword(s):

Finite Element ◽

Deep Drawing ◽

The Finite Element Method ◽

Ansys Software ◽

Forming Process ◽

Thin Steel ◽

Metal Forming Process ◽

Cylindrical Parts ◽

Cylindrical Cup ◽

High Degree

Deep drawing is a very important metal forming process. Thin steel sheet is important material for manufacture of numerous products with deep drawing and stamping. Cold working provides also the possibility of making parts of various shapes, from the simplest to those with a high degree of complexity whose execution through other methods is uneconomical, difficult and sometimes even impossible. In this paper it is analyzed both experimentally and with the help of the finite element, the behavior of the blank during the cylindrical cup deep drawing process, using the ANSYS software program and the finite element method. A comparison is realized between the experimental and the analytical results, elaborating a representative set of problems that analyze the variation of the die punch clearance, movement of the punch and with or without lubrication. The results of the research are useful in developing a sensible design of experiments.

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The Study of the Radius of Connection of the Die for Deep Drawing Using Analysis with Finite Element

Materials Science Forum ◽

10.4028/www.scientific.net/msf.957.103 ◽

2019 ◽

Vol 957 ◽

pp. 103-110

Author(s):

Dan Chiorescu ◽

Esmeralda Chiorescu ◽

Gheorghe Nagîţ ◽

Sergiu Constantin Olaru

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Deep Drawing ◽

Experimental Program ◽

The Finite Element Method ◽

Future Directions ◽

Complex Process ◽

Cylindrical Parts ◽

The Cost ◽

Element Method

Deep drawing is a complex process influenced by the geometric parameters of the die-punch system. In the present paper we study the behavior of the semi-finished product, in the process of drawing deep cylindrical parts, using the finite element method and the software package of the ANSYS program. In order to reduce the cost and design time, an analysis of the variation of the radius connection is carried out, resulting in low energy consumption, using the finite element method. By analysing the radius of connection of the plate, we identify future directions useful in substantiating the elaboration of a judicious experimental program and optimizing the geometric shape of the finished parts.

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Comparative Study of Analytical Expressions to Estimate the Deep Drawing Force of Cylindrical and Rectangular Parts

Volume 2: Advanced Manufacturing ◽

10.1115/imece2016-67273 ◽

2016 ◽

Author(s):

Aarón Rivas Menchi ◽

Hugo I. Medellín Castillo ◽

Dirk F. de Lange ◽

Pedro de J. García Zugasti

Keyword(s):

Deep Drawing ◽

Prediction Performance ◽

Process Efficiency ◽

Equivalent Diameter ◽

Drawing Process ◽

Drawing Force ◽

Deep Drawing Process ◽

The Press ◽

Cylindrical Parts ◽

Analytical Expressions

The deep drawing process has been widely used in the industry because it eliminates costly operations such as welding and machining. However, there are many parameters involved that affect the quality of the final products. One of the main parameters of the deep drawing process is the maximum deep drawing force (DDF) or drawing load, which is the maximum force required to perform a particular deep drawing operation. This maximum DDF is needed to define the required capacity of the press, and to calculate the deep drawing work and the process efficiency. Several analytical expressions to estimate the maximum DDF have been proposed in the literature, particularly for cylindrical parts. However, few research works have focused on analyzing the prediction performance of these expressions. In this paper, the performance of different analytical expressions to estimate the maximum DDF of cylindrical and rectangular parts, is evaluated and compared. Initially, several expressions proposed by different researches for the maximum DDF of cylindrical parts are presented. Then, these expressions are transformed into new expressions for the maximum DDF of rectangular parts by using different concepts of equivalency, such as the equivalent diameter concept. Finally, the prediction performance of all the expressions for both cylindrical and rectangular deep drawing is analysed and compared using experimental data from the literature. The performance is evaluated in terms of the prediction error. The results have suggested that the analytical expressions involving the largest number of parameters have a superior prediction performance than the analytical expressions involving less parameters.

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Investigation of a New Method for Sheet Deep Drawing Based on the Pressure of Magnetic Medium

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.m2014437 ◽

2015 ◽

Vol 56 (6) ◽

pp. 781-784 ◽

Cited By ~ 3

Author(s):

Feng Li ◽

Peng Xu ◽

Xiaochong Sui ◽

Fujian Zhou

Keyword(s):

Deep Drawing ◽

New Method ◽

Magnetic Medium

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Magnetic Medium-Assisted Inverse Bulge Pre-Forming and Deep Drawing Composite Forming Process for Improving Forming Performance of the Cylindrical Parts

10.21203/rs.3.rs-350410/v1 ◽

2021 ◽

Author(s):

Yuan Yuan Mu ◽

Feng Li ◽

Chao Li ◽

Yun Qi Zang ◽

Jie Xu

Keyword(s):

Wall Thickness ◽

Deep Drawing ◽

Equivalent Stress ◽

Stress Gradient ◽

Cylindrical Part ◽

Drawing Ratio ◽

Forming Process ◽

Cylindrical Parts ◽

Soft Mold ◽

Bulge Height

Abstract Due to the poor plasticity of aluminum alloy at room temperature, it is difficult to form thin-walled and complex curved parts. This paper proposes a composite method of inverse bulge pre-forming deep drawing based on intelligent magnetorheological (MR) fluid materials. Through the experiments and finite element modeling of cylindrical parts with drawing ratios of K1=2.125 and K2=2.25 were carried out under different forming conditions. The effect of soft mold medium on the drawing forming of cylindrical parts was studied. The research results show that the uniformity of the wall thickness of the parts is enhanced after using the soft mold medium. When the inverse bulge height is about 9mm and 5mm, the wall thickness variance of the cylindrical part is 0.0023 and 0.0025 pectively, which is reduced by 86.31% and 82.8% respectively. In the pre-forming stage, as the height of inverse bulge is increased, the maximum equivalent stress moves from the fillet area of the blank holder to the outer surface of the highest point of the bulging area. Taking drawing ratio of K1=2.125 as an example, the circumferential compressive stress in the flange area decreases and is distributed unifomly under the back pressure and soft drawbeads, the radial stress gradient and equivalent stress gradient at the fillet of die are reduced; For cylindrical parts with drawing ratios of K1=2.125 and K2=2.25, when the inverse bulge height is 9mm and 5mm, the forming effect of the part is the best.

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