Numerical simulation of various cross sectional workpieces using conventional deep drawing and hydroforming technologies

2008-04-01
Onder, Erkan
TEKKAYA, AHMET ERMAN
This study focuses on the determination of optimum sheet metal forming process and process parameters for various cross sectional workpieces by comparing the numerical results of high-pressure sheet metal forming, hydro-mechanical deep drawing (DD) and conventional DD simulations. Within the range of each cross section, depth, characteristic dimensions ratio and fillet radius have been altered systematically. Steel of types St14 and DC04 have been used as the specimen material in the numerical analyses and the experimental verification throughout the study. All numerical simulations have been carried out by using a dynamic-explicit commercial finite element code and an elasto-plastic material model. During the analyses each workpiece was simulated by the three competing processes. The results of analyses, such as sheet thickness distribution, necking, forming of radii etc., are used for assessing the success of each forming process alternative. The analyses revealed that depending on the workpiece geometry and dimensional properties certain processes are preferable for obtaining more satisfactory products. Working windows for each process have been established based on the analyzed parameters of the circular, elliptic, rectangular and square cross sectional product geometries. This data is expected to be useful for selecting the appropriate production process for a given workpiece geometry and understand the limits of each sheet metal forming processes.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE

Suggestions

APPLICATION OF 3 NONLINEAR-PROGRAMMING TECHNIQUES IN OPTIMIZING MACHINING CONDITIONS
ESKICIOGLU, AM; ESKICIOGLU, H (SAGE Publications, 1992-01-01)
Mathematical models used for determining optimal machining conditions are non-linear functions subject to non-linear constraints. In this paper models for unit production cost and unit production time for multi-pass milling operations are developed, taking cutting speed, depth of cut, feed and number of passes as design variables. The problem is then solved by three non-linear programming methods, namely the generalized reduced gradient (GRG) method, the sequential unconstrained minimization technique (SUMT...
Design and analysis of filament wound composite tubes
Balya, Bora; Parnas, Kemal Levend; Department of Mechanical Engineering (2004)
This thesis is for the investigation of the design and analysis processes of filament wound composite tubes under combined loading. The problem is studied by using a computational tool based on the Finite Element Method (FEM). Filament wound tubes are modeled as multi layered orthotropic tubes. Several analyses are performed on layered orthotropic tubes by using FEM. Results of the FEM are examined in order to investigate characteristics of filament wound tubes under different combined loading conditions. W...
Free forming of locally heated specimens
Okman, O.; Ozmen, M.; Huwiler, H.; Tekkaya, A. E. (Elsevier BV, 2007-06-01)
A novel manufacturing method is investigated, in which a steep temperature gradient within the workpiece is induced to facilitate material flow locally. By this method, complex shapes can be formed without complicated dies. The feasibility of the idea is analyzed experimentally and numerically. Local heating is realized either by means of induction or laser heating. Experiments using materials 16MnCr5, X5CrNi18/9, and Ti6Al4V have been conducted under various process conditions. These experiments have also ...
Analysis of thin walled open section tapered beams using hybrid stress finite element method
Akman, Mehmet Nazım; Oral, Süha; Department of Mechanical Engineering (2008)
In this thesis, hybrid stress finite element is formulated for the analysis of the isotropic, thin walled, open section beams with variable cross sections. The beam element has two nodes each having seven degrees of freedom. Assumption of stress field is sufficient to determine the element stiffness matrix. Axial, flexural and torsional effects are taken into account in the analysis. The methodology can be applied both to the tapered and the uniform beams. Throughout this study, firstly element cross-sectio...
Proposal and evaluation of a KBE-RM selection system
Munguia, Javier; Bernard, Alain; Erdal Erdoğmuş, Merve (Emerald, 2011-01-01)
Purpose - The purpose of this paper is to propose and evaluate a novel tool for the assessment and selection of rapid prototyping (RP)/manufacturing (RM) systems as alternative processes for low-volume production in the machinery and equipment design sector. By analysing previous RP/RM selectors, this research addresses the necessary factors that a knowledge-based engineering (KBE) system must include for the analysis, comparison and ranking of candidate technologies.
Citation Formats
E. Onder and A. E. TEKKAYA, “Numerical simulation of various cross sectional workpieces using conventional deep drawing and hydroforming technologies,” INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, pp. 532–542, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65872.