Analysis of the Sheet Shell's Curvature with Lame's Superellipse Method during Superplastic Forming

Аніщенко, Олександр Сергійович; Kukhar, Volodymyr; Grushko, A.V.; Vishtak, Inna; Prysiazhnyi, Andrii; Balalayeva, Elena

doi:10.4028/www.scientific.net/msf.945.531

Cited by 31 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A variety of materials processing methods include research into the possibilities of improving the performance of products in layered execution (ballistic durability of the design) [1], hot forging and stamping processes [2], rolling on rolling mills with hot stripes [3]. The use of explosive processing techniques for the manufacture of powdered materials products was demonstrated in work [4], the development of theoretical methods of describing the shape of bodies and their shape formation in the manufacture of sheet and bulk blanks was addressed in paper [5]. In turn, the intensive development in recent decades of precision volume stamping technology contributes to the increase in production volumes and the expansion of the range of stamped parts with the use of cold extrusion processes [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Predicting the shape formation of hollow parts with a flange in the process of combined radial-reverse extrusion

Hrudkina¹,

Aliievа²,

Марков³

et al. 2020

EEJET

View full text Add to dashboard Cite

The simulation of the process of combined radial reverse extrusion of hollow parts with a flange has established two fundamentally different, in terms of the components of the kinematic modules, calculation schemes CDZ-1.i and CDZ-2.j, taking into conside ration the possible shape of the boundary of the section of a metal flow inside a workpiece. The comparison of the dependences of the optimal relative rate of metal outflow in the opposite direction for different schemes indicates significant differences in the resulting values in the course of the deformation process. The relevance of this study is due to making it easier to evaluate the use of the combined extrusion process to produce hollow parts with a flange while maintaining the required dimensions compared to simple deformation schemes. We have identified the lack of detailed studies into the technologies for the introduction of combined extrusion schemes, as well as the absence of technological recommendations for determining the force regime and the shape formation of a semi-finished article. The process of the combined extrusion of hollow parts with a flange was investiga ted, thereby selecting different types based on the nature of the metal flow depending on the geometric ratios of the deformation process. We have obtained experimental data on the gradual shape formation of a semi-finished product in the process of deformation at different geometric ratios. The limits of using estimation schemes of the process have been defined to obtain data on the increments in a semi-finished product, including in terms of predicting the formation of a shrinkage cavity in the bottom part. It is recommended that a condition of selecting the appropriate scheme should be the condition for a minimum value of the reduced pressure of deformation i < j. The resulting recommendations make it easier to predict the shape formation and the force mode of extrusion (a deviation from experimentally obtained data can be reduced to 10 %), which would contribute to evaluating the rationality of the combined extrusion processes while ensuring the required dimensions of a part

show abstract

Section: Introductionmentioning

confidence: 99%

Predicting the shape formation of hollow parts with a flange in the process of combined radial-reverse extrusion

Hrudkina¹,

Aliievа²,

Марков³

et al. 2020

EEJET

View full text Add to dashboard Cite

show abstract

“…At present, the availability of a variety of methods for processing metals by pressure renders relevance to the task of choosing the most rational and economical method [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The areas of theoretical research relate to the methods that describe the shape of bodies, the techniques that simplify the assessment of the force regimes and the shape formation of a semi-finished product, etc. [4,5]. Special emphasis is also on the role of resource-saving methods of treating metals with pressure, based on cold plastic deformation, allowing for the production of billets with exact dimensions and high surface quality [6].…”

Section: Introductionmentioning

confidence: 99%

Predicting the shape formation of parts with a flange and an axial protrusion in the process of combined aligned radial-direct extrusion

Hrudkina

Aliievа

Марков

et al. 2020

EEJET

View full text Add to dashboard Cite

Using the calculation schemes CS-1 (with the presence of a trapezoid module) and CS-1a (with rectangular kinematic modules) has been proposed for the process of the combined radial-direct extrusion of parts with a flange and an axial protrusion. The application of a trapezoidal kinematic module allows the description of the characteristic regions of metal flow, close to the actual course of the process based on the distorted coordinate grids. On the basis of the energy method, the values of the reduced deformation pressure have been obtained using the upper estimate of the power of deformation forces inside the trapezoidal kinematic module. The optimization involved the parameter Rk that determines the position of the surface of the interface of metal flow into an axial protrusion and a flange zone. We have performed a comparative analysis of the theoretical calculations of the magnitude of the reduced deformation pressure and the influence of geometric ratios and friction conditions on the qualitative and quantitative differences in the character of the change in the resulting curves. The overestimation of data on assessing the force mode based on the CS-1a scheme relative to the calculations based on the CS-1 scheme can be as high as 50 % and indicates the rationality of using the latter. This is due to the limitation in the use of the optimization (the absence of the optimization of the height of the deformation site) for the scheme containing elementary rectangular kinematic modules. The deviation from the experimentally obtained increments in an axial protrusion does not exceed 7-10 %, which indicates the validity of the use of the CS-1 estimation scheme with a trape zoidal kinematic module. Thus, it can be argued that it is correct to determine the position of the boundary of the surface of the interface of metal flow into an axial protrusion and a flange zone and the resulting assessment of the formation of a semi-finished product

show abstract

“…Steel sheet products and products from it are the most common product of metallurgical and machine-building enterprises [1][2][3], also, very stringent requirements are imposed of the geometric accuracy of these products [4][5][6][7]. Steel reinforcing cold-formed shapes are common products manufactured by enterprises specializing in the metal forming processes.…”

Section: Introductionmentioning

confidence: 99%

“…It is also known that the sheet blank is prone to springing at bending on multi-roll rollforming mills [8,15]. The spring-back angle can be determined based on experimental analysis of the measuring experiments [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Spring-back effect during multi-pass bending of sheet blanks

2019

View full text Add to dashboard Cite

A significant factor, which leads to the discrepancy of the final sizes of the bent sheet parts to their drawings is the springing of the sheet blank during bending. At the same time, the springing during multi-pass bending is not sufficiently studied. The purpose of the work is to obtain the graphical and mathematical dependencies for descriptions of the resultative spring-back angle of the blanks at the multi-pass bending, taking into account the width of the blank, number of passes, and pre-bending angle at each preliminary pass. The paper describes the basic information about the difference between the spring-back angle for one-pass or multi-pass bending. In the course of the study it is shown that during calculations of forming and preventive prediction of the geometric quality of bending shapes it is necessary to take into account properties of the blank material, as well as the angles of the prebends and the width to thickness ratio of the blank. A methodology of experimental research was developed for determining the spring-back angle during multi-pass bending in three bending dies with 109°, 91° and 72° pass-by-pass reducing angles.

show abstract

Analysis of the Sheet Shell's Curvature with Lame's Superellipse Method during Superplastic Forming

Cited by 31 publications

References 18 publications

Predicting the shape formation of hollow parts with a flange in the process of combined radial-reverse extrusion

Predicting the shape formation of hollow parts with a flange in the process of combined radial-reverse extrusion

Predicting the shape formation of parts with a flange and an axial protrusion in the process of combined aligned radial-direct extrusion

Spring-back effect during multi-pass bending of sheet blanks

Contact Info

Product

Resources

About