Numerically modeling spring back and spring go amounts and bending deformations of Cr-Mo alloyed sheet material

2020 ◽  
Vol 62 (12) ◽  
pp. 1265-1272
Author(s):  
Mustafa Özdemir ◽  
Hakan Dilipak ◽  
Bülent Bostan
Keyword(s):  
Sheet Material ◽  
Spring Back

Numerically modeling spring back and spring go amounts and bending deformations of Cr-Mo alloyed sheet material

2020 ◽  
Vol 62 (12) ◽  
pp. 1265-1272
Author(s):  
Mustafa Özdemir ◽  
Hakan Dilipak ◽  
Bülent Bostan
Keyword(s):  
Heat Treatment ◽  
Mathematical Models ◽  
Deformation Zone ◽  
Sheet Material ◽  
Analysis Program ◽  
Spring Back ◽  
Forming Process ◽  
Bending Angle ◽  
Heat Treated ◽  
Bending Process

Abstract In the study conducted for this contribution, sheet material 4 mm thick, non-heat treated (II), normalized (NH) and tempering heat treatment implemented (TH), were formed at a bending angle of 90°. As a result of the forming process, the effects of the R2, R3, R4, R5, and R6 mm punch tip radii on spring back and spring go values were investigated. The bending operations were carried out by waiting for the punch in the material bending zone for 30 sec and then lifting. The samples were extracted from the middle deformation zone of the II, NH and TH applied sheet material, to which the bending process was applied, following which their ferrite phase, pearlite and martensite structures were microstructurally analyzed. A Minitab analysis program was used to investigate the effect of the bending parameters on the sheet material’s spring-back and spring-go behavior. Moreover, the effects of bending parameters were investigated by creating numerical and mathematical models. Thus, it was determined that spring-go behavior occurred on the II and NH applied sheet material, while spring-back behavior occurred on the TH applied material.

Technological features of autoclave molding of parts of complex configuration from В95оч alloy sheets

2021 ◽  
Author(s):  
Keyword(s):  
Heat Treatment ◽  
Technological Process ◽  
Aging Process ◽  
Sheet Material ◽  
High Strength ◽  
Spring Back ◽  
Corrosion Properties ◽  
Strength Alloy ◽  
Mechanical And Corrosion Properties ◽  
Wing Skin

The development is shown with the use of modeling the technological process of autoclave molding, combined with the aging process, for the manufacture of upper wing skins from sheets of "В95оч" high-strength alloy taking into account the spring back of the workpiece. The results of studies of indicators of mechanical and corrosion properties of the resulting product are presented. Keywords: autoclave molding, heat treatment, springback, upper wing skin, sheet material, "В95оч". [email protected]

Investigations on Dimensional Accuracy of Stamped Tailor Welded Blanks Under Warm Forming Conditions

2017 ◽  
Author(s):  
Vakada Venkata Naga Satya Suresh ◽  
Srinivasa Prakash Regalla
Keyword(s):  
Stainless Steel ◽  
Sheet Material ◽  
Dimensional Accuracy ◽  
Warm Forming ◽  
Thickness Variation ◽  
Geometric Accuracy ◽  
Spring Back ◽  
Tailor Welded Blanks ◽  
Tailor Welded Blank ◽  
Simulation Results

This work emphasizes on the geometric and dimensional accuracy of cylindrical tailor welded blank (TWB) components manufactured under warm forming conditions. In this work, TWB sheet material made of austenitic stainless steel (ASS 304 Grade) and deep drawing steel (IS 513 grade) materials were TIG welded before subjecting to stamping operation. Numerical simulations were validated with experimental results. Simulation results were analyzed to check the thickness variation and stress distribution within the component which otherwise would be difficult to measure experimentally. Measurements in terms of geometric accuracy gave encouraging results. The roundness and perpendicularity measurements indicated better accuracy whereas, cylindricity value has slightly improved. However, dimensional accuracy of the parts in terms of thinning, cup height and diameter has deteriorated. It was found that the spring back effect played a significant role in the deterioration of dimensional accuracy. Presence of residual stresses might be the cause for this effect; further studies are needed to address this issue.

scholarly journals Optimization of Spring Back in Air V Bending Processing using Taguchi and RSM Method

Mechanika ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 73-81
Author(s):  
Mustafa özdemir
Keyword(s):  
Experimental Data ◽  
Dual Phase Steel ◽  
Sheet Material ◽  
Optimal Combination ◽  
Dual Phase ◽  
Spring Back ◽  
Signal To Noise ◽  
Surface Method ◽  
Bending Process ◽  
Simulation Results

In this study, springback behaviour of Dp600 (Dual Phase Steel) sheet material was investigated using air V bending technique.  As bending parameters, four different punch tip radii and four different sheet thicknesses were used. The springback values obtained from the experiments were compared with each other. At the same time, the experimental data were analysed with Response Surface Method (RSM) and Taguchi (L16) orthogonal array. The experimental data and the simulation results were found to be consistent. The signal-to-noise (S/N) ratio is used to determine the most appropriate parameter of minimum springback behaviour. Additionally, it is possible to estimate the optimal combination of the bending parameters. The signal-to-noise (S/N) ratio and the design of experiment (DOE) were utilised for the analysis of the experimental results. It was determined that the effect of these parameters on the air V bending process was based on springback behaviours.

Numerical Determination of Unconstrained Area Effect on Springback in Incremental Forming of 5052-H32 Aluminum

2019 ◽  
Author(s):  
Tyler J. Grimm ◽  
Laine Mears
Keyword(s):  
Energy Savings ◽  
Incremental Forming ◽  
Sheet Material ◽  
Spring Back ◽  
Forming Process ◽  
Reduction Methods ◽  
Dieless Forming ◽  
Material Forming ◽  
Time And Energy

Abstract Incremental forming (IF) is a novel sheet material forming process which promises significant energy savings within the low and medium volume sheet production industries. This advantage stems from IF’s dieless forming nature, which alleviates the need for time and energy input towards die fabrication and offers significantly greater flexibility. However, a distinct disadvantage of this process is its relatively low forming rate compared to conventional stamping, which reduces its feasibility of use in higher volume productions. Springback is one disadvantage of incremental forming which has hindered its implementation within industry. Spring-back reduction methods, as well as springback characterization, can be found throughout literature. However, very few publications disclose the clamping dimensions used for fixturing work-pieces. This study numerically determines the springback effect of utilizing various clamping structures and presents an empirical solution for determining the springback of truncated pyramid geometries for various constraining areas. The resulting equation was found to have an acceptable degree of error relative to experimental analysis.

Analysing Mechanical Systems in Domestic and Foreign CAD Systems

2018 ◽  
pp. 10-17
Author(s):  
V. A. Martynyuk ◽  
V. A. Trudonoshin ◽  
V. G. Fedoruk
Keyword(s):  
Sheet Material ◽  
The Finite Element Method ◽  
Cad Systems ◽  
Cad System ◽  
Software Products ◽  
Foreign Products ◽  
Nonlinear Algebraic Systems ◽  
Software Product ◽  
Pipeline Design ◽  
The Mathematical Model

The article considers applications of foreign CAD-systems in creating the challenging projects at domestic enterprises and design bureaus. As stated in the article "... presently, there is no domestic CAD-system that could completely replace such foreign products as NX, CATIA, Credo". Besides, due to international cooperation in creating the challenging projects (for example, the project to create a modern wide-body aircraft, proposed jointly with China), it makes sense to use the worldwide known and popular CAD systems (the aforementioned NX, CATIA, Credo). Therefore, in the foreseeable future, we will still have to use foreign software products. Of course, there always remains a question of the reliability of the results obtained. Actually, this question is always open regardless of what software product is used - domestic or foreign. This question has been haunting both developers and users of CAD systems for the last 30 to 40 years. But with using domestic systems, it is much easier to identify the cause of inaccurate results and correct the mathematical models used, the methods of numerical integration applied, and the solution of systems of nonlinear algebraic systems. Everything is much more complicated if we use a foreign software product. All advertising conversations that there is a tool to make the detected errors available to the developers, remain only conversations in the real world. It is easily understandable to domestic users, and, especially, to domestic developers of similar software products. The existing development rates and competition for potential buyers dictate a rigid framework of deadlines for releasing all new versions of the product and introducing the latest developments into commercial product, etc. As a result, the known errors migrate from version to version, and many users have accepted it long ago. Especially, this concerns the less popular tools rather than the most popular applications (modules) of a CAD system. For example, in CAD systems, the "Modeling" module where geometric models of designed parts and assembly units are created has been repeatedly crosschecked. But most of the errors are hidden in applications related to the design of parts from sheet material and to the pipeline design, as well as in applications related to the analysis of moving mechanisms and to the strength or gas dynamic analysis by the finite element method.The article gives a concrete example of a moving mechanism in the analysis of which an error was detected using the mathematical model of external influence (a source of speed) in the NX 10.0 system of Siemens.

Phenomenon of Leaflets

2009 ◽  
pp. 55-61
Author(s):  
Anna A. Fomina
Keyword(s):  
Sheet Material ◽  
History Of ◽  
National Libraries ◽  
Regions Of Russia

Leaflets still remain unexplored resource in local lore. Distribution of sheet material as a printed advertising in different regions of Russia opens new pages of informational local lore. The history of local printed collections keeps names of few figures and projects connected with forming of “flying sheets” funds. The involvement of national libraries into this process allows for experts to predict the importance of ephemerae catalogues for the system of union library catalogues in our country.

scholarly journals Comparison of Two Intergranular Corrosion Tests on EN AW-6016 Sheet Material

2021 ◽  
Vol 11 (11) ◽  
pp. 5294
Author(s):  
Peer Decker ◽  
Ines Zerbin ◽  
Luisa Marzoli ◽  
Marcel Rosefort
Keyword(s):  
Optical Microscopy ◽  
Intergranular Corrosion ◽  
Sheet Material ◽  
Test Methods ◽  
Standard Test ◽  
Corrosion Depth ◽  
Corrosion Tests ◽  
Automotive Company ◽  
Test Parameters

Two different intergranular corrosion tests were performed on EN AW-6016 sheet material, an ISO 11846:1995-based test with varying solution amounts and acid concentrations, and a standard test of an automotive company (PV1113, VW-Audi). The average intergranular corrosion depth was determined via optical microscopy. The differences in the intergranular corrosion depths were then discussed with regard to the applicability and quality of the two different test methods. The influence of varying test parameters for ISO 11846:1995 was discussed as well. The determined IGC depths were found to be strongly dependent on the testing parameters, which will therefore have a pronounced influence on the determined IGC susceptibility of a material. In general, ISO 11846:1995 tests resulted in a significantly lower corrosion speed, and the corrosive attack was found to be primarily along grain boundaries.

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