scholarly journals Experimental Modeling of Pressure in the Hydrostatic Formation of a Cylindrical Cup with Different Materials

2021 ◽  
Vol 11 (13) ◽  
pp. 5814
Author(s):  
Trung-Kien Le ◽  
Thi-Thu Nguyen ◽  
Ngoc-Tam Bui
Keyword(s):  
Fluid Pressure ◽  
Regression Method ◽  
Mathematical Equation ◽  
Forming Process ◽  
Forming Technology ◽  
Input Parameters ◽  
Sheet Products ◽  
Cylindrical Cup ◽  
The Relationship

Forming complex sheet products using hydrostatic forming technology is currently a focus of the majority of forming processes. However, in order to increase stability during the forming process, it is necessary to identify and analyze the dependency of the forming pressure and the quality of a product on input parameters. For the purpose of modeling the forming pressure, this paper presents empirical research on the product of a cylindrical cup made of various materials, including carbon steel (DC04), copper (CDA260), and stainless steel (SUS 304) with different thicknesses (0.8 mm, 1.0 mm, and 1.2 mm), under a defined range of binder pressures. The regression method is selected to formulate an equation that shows the relationship between the input parameters, including the materials (ultimate strength and yield stress), workpiece thickness, binder pressure and the output parameter, and the formation of fluid pressure. The mathematical equation allows us to determine the extent of the effect of each input on the forming pressure. The experimental results can be used for the easier planning and forecasting of the process and product quality in hydrostatic forming.

Experimental modeling of fluid pressure in hydrostatic forming for cylindrical product

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040158
Author(s):  
Nguyen Thi Thu ◽  
Nguyen Dac Trung
Keyword(s):  
Fluid Pressure ◽  
Regression Function ◽  
Die Design ◽  
Design Calculation ◽  
Forming Process ◽  
Blank Holder ◽  
Forming Technology ◽  
Input Parameters ◽  
Function Relationship ◽  
And Control

Forming fluid pressure is an important technological parameter that determines whether a product can be accurately formed according to the size and profile of the die in hydrostatic forming technology. The expected value of this parameter is often very high because it acts as the punch in forming complex products from sheet metal. However, it is difficult to achieve high values because the forming fluid pressure depends on the ability to hold high pressure of equipment system and input parameters including the blank holder pressure, the depth of die, the thickness of workpiece. Moreover, it is also necessary to have a mathematical model for this parameter to facilitate the calculation and control of the forming process. In order to solve the above problems, this paper will indicate a simple way to avoid the pressure drop during forming process, and establish a regression function relationship between the forming fluid pressure for typical cylindrical product and input parameters above by experimental research method. The results contribute to die design, calculation and control of process parameters to facilitate shaping thin shell products in actual hydrostatic forming technology.

Schwingungsüberlagertes Axialformen/Superimposed Oscillated Axial Forming

2020 ◽  
Vol 110 (11-12) ◽  
pp. 838-843
Author(s):  
Philipp Müller ◽  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Hendrik Vogt ◽  
Daniel Rosenbusch ◽  
...  
Keyword(s):  
Surface Quality ◽  
Economic Importance ◽  
Combined Effect ◽  
Wird Eine ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Great Economic Importance ◽  
Gear Geometry

Techniken zur Steigerung der Formgebungsgrenzen in der Umformtechnik sind von hoher wirtschaftlicher Bedeutung. In dieser Arbeit wird eine Schwingungsüberlagerung im Krafthauptfluss eines Axialformprozesses zur Ausprägung einer Verzahnungsgeometrie untersucht. Die Auswirkungen der Schwingung auf die erzielbare Ausfüllung der Zahnkavitäten werden analysiert sowie die Parameter Schmierung und Oberflächengüte der Halbzeuge in ihrer kombinierten Wirkung untersucht. Es konnte eine Reduzierung der mittleren Umformkraft sowie eine Erhöhung der Formfüllung festgestellt werden. Techniques for extending the production limits in forming technology are of great economic importance. In this research, a superimposed oscillation in the main force flow of an axial forming process to form an axial gear geometry is investigated. The effects of the superimposed oscillation on the achievable form-filling of the tooth cavities are analyzed and the parameters lubrication and surface quality of the semi-finished products are investigated in their combined effect. A reduction of the averaged forming force as well as an increase of the form-filling could be achieved.

Numerical Simulation and Process Optimization of Automotive Friction Materials in Warm Pressing Forming

2013 ◽  
Vol 788 ◽  
pp. 57-60
Author(s):  
Chun Cao ◽  
Chun Dong Zhu ◽  
Chen Fu
Keyword(s):  
Process Optimization ◽  
Heating Temperature ◽  
Maximum Energy ◽  
Heating Time ◽  
Product Performance ◽  
Forming Process ◽  
Friction Materials ◽  
Forming Technology ◽  
The Relationship ◽  
Temperature Heating

Warm pressing forming technology has been gradually applied to the forming of automotive friction materials. How to ensure product performance to achieve the target at the same time achieve the maximum energy saving is the research focus of this study. In this paper, by using finite element method, the field of automotive friction materials in warm pressing forming was analyzed, reveals the relationship between the temperature field and the heating temperature/heating time. Furthermore, the energy consumption was analyzed and compared it with hot pressing forming process. The results will have significant guiding to the process optimization in warm pressing forming.

On the thinning variations in hydrostatic forming of sheet metal

2021 ◽  
Vol 15 (1) ◽  
pp. 7824-7836
Author(s):  
Thu Thi Nguyen ◽  
N.D. Trung
Keyword(s):  
Sheet Metal ◽  
Thickness Distribution ◽  
Input Parameter ◽  
Relative Depth ◽  
Technological Parameters ◽  
Forming Technology ◽  
Input Parameters ◽  
Forming Characteristics ◽  
Cylindrical Cup ◽  
Forming Methods

In sheet metal forming, thinning phenomenon is one of the most concerned topics to ameliorate the final quality of the manufactured parts. The thinning variations depend on many input parameters, such as technological parameters, geometric shape of die, workpiece’s materials, and forming methods. Hydrostatic forming technology is particularly suitable for forming thin-shell products with complex shapes. However, due to the forming characteristics, the thinning variations in this technology are much more intense than in other forming methods. Therefore, in this paper, an empirical study is developed to determine the thinning variations in hydrostatic forming for cylindrical cup. Measurement of thickness at various locations of deformed products are conducted to investigate the thickness distribution and determine the dependence of the largest thinning ratio on the input parameters (including the blank holder pressure, the relative depth of the die and the relative thickness of the workpiece). The results are expressed in charts and equation which allow determining the effect of each input parameter on the largest thinning ratio.

Synchronized Hydraulic Bulging Forming Technology of Three-Layer-Metal Tubes

2010 ◽  
Vol 143-144 ◽  
pp. 1059-1064
Author(s):  
Wei Wei Wang ◽  
Jian Li Song ◽  
Jing Bo Yu ◽  
B.B. Jia
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Theoretical Analysis ◽  
Main Process ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Technology ◽  
Comparison Of The Results ◽  
Hydraulic Bulging ◽  
The Relationship

Synchronized hydraulic bulging forming technology on three-layer-metal tubes was studied. The possibility of three-layer-metal tubes formed by hydraulic bulging method was discussed and proved by elastic-plastic theory. The calculation formulas about the bulging pressure, the residual contact stress and the relationship between them were derived and the main process parameters were analyzed. Finite element analysis was carried out on bulging forming process using MSC. Marc. Practical bulging forming experiments were conducted and well compounded three-layer-metal tubes with tight interfaces were obtained. Through the comparison of the results of theoretical analysis, numerical simulation and practical experiments, proper parameters for the bulging process were obtained and the theoretical analysis was verified and proved.

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.

Studying on Hot Pressure Casting Process of CaZr0.9In0.1O3-α Tubes for Hydrogen Sensor in Aluminum Melt

2013 ◽  
Vol 706-708 ◽  
pp. 301-303 ◽  
Author(s):  
Dong Wang ◽  
Sheng Li Li ◽  
Wei Juan Li ◽  
Ji Guang Li ◽  
Jun Liu ◽  
...  
Keyword(s):  
Proton Conductor ◽  
Casting Process ◽  
Hydrogen Sensor ◽  
Mold Temperature ◽  
Pressure Casting ◽  
Forming Process ◽  
Relationship Of ◽  
Casting Pressure ◽  
The Relationship

The relationship of the powders and binder system and forming process on the quality of the U-shaped proton conducting CaZr0.9In0.1O3-α tubes was studied. The results showed that defect-free green bodies can be obtained under the conditions of the wax slurry containing 87.8% (mass percentage, the same below) proton conductor powders, 11% paraffin wax, 1% beeswax and 0.2% oleic acid, the wax slurry and mold temperature at 73°C and 30°C, the casting pressure and time at 0.5MPa and 15s. A reasonable wax removing schedule about the green bodies was put forward. At last the sintered samples were characterized by higher density and less shrink rate and distortion.

Superimposing Ultrasonic Waves on the Dies in Tube and Wire Drawing

2001 ◽  
Vol 123 (4) ◽  
pp. 517-523 ◽  
Author(s):  
Klaus Siegert ◽  
Jochen Ulmer
Keyword(s):  
Sliding Friction ◽  
Wire Drawing ◽  
Ultrasonic Waves ◽  
Forming Process ◽  
Vibration Direction ◽  
Tube Drawing ◽  
Forming Technology ◽  
The University ◽  
Main Influence

The forces during wire and tube drawing can be reduced by ultrasonically oscillating dies. It is a major problem of conventional wire and tube drawing to introduce high forces into the forming area. Compared to conventional wire and tube drawing, the forming process limits can be extended by superimposing ultrasonic waves due to decreasing drawing forces. Different techniques can be used to excite the die. One possibility is the variation of the vibration mode. In tube and wire drawing, the dies are usually excited longitudinally. If the vibration direction is parallel to the drawing direction, the main influence will be on the friction between workpiece and die. The Institute for Metal Forming Technology of the University of Stuttgart, Germany started a project to investigate the effect of ultrasonic waves on the tribology and on the formability of the workpiece. The objective of this investigation is to separate the ultrasonic effect on the surface from the volume effects. This paper shows that the reduction of the sliding friction between a longitudinal oscillating die and the workpiece can be explained by the so-called Sliding Friction Vector Effect (SFVE). A statistical evaluation of roughness-measurements makes it possible to show the effect of the ultrasonic vibration on the friction and gives an insight into the operation of the SFVE. The results are compared with wire and tube drawing experiments of copper and Ti-alloys. New tube- and wire-drawing experiments with longitudinally vibrating dies support the theoretical approach. The surface quality of the manufactured workpieces can be improved and the productivity increased.

Velocity in High Viscosity Fluid Forming Process

2013 ◽  
Vol 281 ◽  
pp. 347-350
Author(s):  
Jian Li Zheng ◽  
Ren Hua Bai ◽  
Yuan Lou Gao
Keyword(s):  
Temperature Field ◽  
Flow Velocity ◽  
High Viscosity ◽  
Water Velocity ◽  
Forming Process ◽  
The Relationship ◽  
Viscosity Fluid

In the process of extrusion of explosive whose melt is high viscosity fluid, the quality of explosive is decided by temperature field and flow velocity, because temperature field is depend on the flow velocity and temperature of Jacket water, velocity in forming process has more impact on quality of product. The paper studies on the relationship between flow velocity and molding quality by simulate the progress that relevant a plant. The result shows that quality and velocity of flow are positively related to the square.

Superimposing Ultrasonic Waves on Tube and Wire Drawing

2000 ◽  
Author(s):  
Klaus Siegert ◽  
Jochen Ulmer
Keyword(s):  
Sliding Friction ◽  
Wire Drawing ◽  
Ultrasonic Waves ◽  
Forming Process ◽  
Vibration Direction ◽  
Tube Drawing ◽  
Forming Technology ◽  
The University ◽  
Main Influence

Abstract The drawing forces during wire and tube drawing can be reduced by ultrasonically oscillating dies. A major problem of conventional wire and tube drawing is to introduce high forces into the forming area. Compared to conventional wire and tube drawing, the forming process limits can be extended by superimposing ultrasonic waves due to decreasing drawing forces. Different techniques can be used to exite the die. One possibility is the variation of the vibration mode. In tube and wire drawing, the dies are usually exited longitudinally. If the vibration direction is parallel to the drawing direction, the main influence will be on the friction between workpiece and die. The Institute for Metal Forming Technology of the University of Stuttgart, Germany started a project to investigate the effect of ultrasonic waves on the tribology and on the the formability of the workpiece. The objective of this investigation is to separate the ultrasonic effect on the surface from the volume effects. This paper shows, that the reduction of the sliding friction between a longitudinal oscillating die and the workpiece can be explained by the so called Sliding Friction Vector Effect (SFVE). A statistical evaluation of roughness-measurements makes it possible to show the effect of the ultrasonic vibration on the friction and gives an insight into the operation of the SFVE. The results are compared with wire and tube drawing experiments of copper and Ti-alloys. New tube- and wire-drawing experiments with longitudinally vibrating dies support the theoretical approach. The surface-quality of the manufactured workpieces can be improved and the productivity increases.

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