scholarly journals Experimental, Statistical, and Analytical Evaluation of The Springback Behavior of Martensitic 1400 Sheet in V-Bending

2020 ◽  
Author(s):  
Nuri ŞEN ◽  
Ömer SEÇGİN
Keyword(s):  
Automotive Industry ◽  
High Strength ◽  
Fe Model ◽  
Light Weight ◽  
Analytical Evaluation ◽  
Bending Process ◽  
Punch Radius ◽  
Different Temperatures ◽  
Operation Parameters ◽  
Springback Behavior

Abstract Ultra-high-strength Martensitic 1400 steel is preferred in the automotive industry because of its high strength as well as its light weight. In this study, Martensitic 1400 steel was subjected to the V-bending process. As a result of 48 different tests, the amount of springback resulting from the V-bending process was determined. A finite element (FE) model was then created based on these experimental data. After it was determined that the experimental results concurred with the FE model, without performing new experiments, further analyses were carried out at different temperatures. Using the results of a total of 96 FE analyses, variance analysis was performed and the effects of the operation parameters on springback were determined. As a result of the study, it was concluded that the most effective parameter on springback in the V-bending process was the die angle and that holding time had no significant effect. It was observed that the springback increased in parallel with the punch radius and die angle and that increases in temperature reduced the springback.

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

DESIGN PARAMETERS SELECTION OF SPRINGBACK EFFECT IN AIR-V BENDING USING TAGUCHI APPROACH ON ADVANCE HIGH STRENGTH STEEL-DP590

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Shahrul Azam Abdullah ◽  
Muhamad Sani Buang ◽  
Juri Saedon ◽  
Hashim Abdullah
Keyword(s):  
Plate Thickness ◽  
High Strength Steels ◽  
High Strength ◽  
Design Parameters ◽  
Optimum Level ◽  
Advanced High Strength Steels ◽  
Parameters Selection ◽  
Bending Process ◽  
Punch Radius ◽  
Evaluation Problem

Advanced High Strength Steels (AHSS) are increasingly utilized especially in automotive industry. However, forming of AHSS is challenging particularly in prediction of springback effect caused by material properties, tools and dies parameters, work material and bending technique factors. An air V-bending process was chosen as an evaluation problem because it showed larger springback effect. This paper presents an optimization to predict the influence of various parameters on springback of sheet metal in air V-bending process using Taguchi method (TM). The experimental study was conducted on DP590 sheets with plate thickness of 1 and 2 mm under different process parameters such as punch radius, die radius, die gap and punch travel. A significant level of springback parameters was further described by using the analysis of variance (ANOVA). It showed that the contribution percentage of each factor to springback was calculated to optimum level and the significant levels of entire factor were observed. The thickness of material, die width, punch travel and punch radius were found to be the most significant factor affecting springback while die radius is insignificant. 

An Investigation on Effect of Residual Stress on Springback Behavior of High Strength Steel in U-Bending Process

2011 ◽  
Vol 189-193 ◽  
pp. 2864-2868
Author(s):  
Komgrit Lawanwong
Keyword(s):  
Residual Stress ◽  
Fem Simulation ◽  
Sheet Thickness ◽  
High Strength ◽  
Spring Back ◽  
Workpiece Material ◽  
Bending Process ◽  
Commercial Program ◽  
Deform 2D ◽  
Springback Behavior

Bending process is an important process in the metal sheet forming in many industries. The main problem of the bending process is the spring-back phenomenon after removing the punch. This research aims the investigation on effect of residual stress on springback behavior of sheet metal in U bending process. The corner setting technique and bottoming process were designed for experiments. The corner setting technique and bottoming has reduced the thickness in bending area to 5, 10, 15 and 20 percent of the original sheet thickness. Clearance between punch and die of both processes was equal to same the thickness. The residual stress value and springback phenomenal were investigated by commercial program code DEFORM 2D which was able to analyze the effect stress and force in bending area. Electrolytic zinc coated carbon steel grade JIS; SECC, JIS; 440 and JIS; 590 which having the thickness of 1 mm were employed as the workpiece material for all experiments. The result of three materials in conventional U bending die shows larger spring back than the corner setting technique and bottoming process. Moreover, the corner setting technique reduces spring back value in bending process but requires high bending force. Corner setting technique and bottoming process at 15% and 20% shows that the spring go of all parts. The FEM simulation results explained the effect of residual stress to springback phenomenal. Comparisons between experimental and finite element method results were also performed.

Analysis of the Potential of Incremental Stress Superposition on Air Bending

2014 ◽  
Vol 622-623 ◽  
pp. 1173-1180 ◽  
Author(s):  
Andres Weinrich ◽  
Chrstioph Becker ◽  
Frauke Maevus ◽  
Sami Chatti ◽  
A. Erman Tekkaya
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Forming Limits ◽  
Air Bending ◽  
Bending Process ◽  
New Process ◽  
Sheet Metal Bending ◽  
Stress Superposition ◽  
Positive Effect ◽  
Springback Behavior

Springback and limited forming limits of modern high strength steels are a big challenge in manufacturing engineering. Both aspects are crucial in sheet metal bending processes. Different modifications of the air bending process have already been developed in order to reduce springback and also to increase the forming limits of materials. A new method (the incremental stress superposition on air bending) has been developed. Studies of this new process alternative show a positive effect on the springback behavior. In order to investigate the potential of this process a comparison with other already established bending processes have been carried out. A possible process control to extend the forming limits has also been investigated.

scholarly journals A Simulation-Based Approach to Predict the Springback Behavior of Ultra-High Strength Spring Strips

2019 ◽  
Vol 949 ◽  
pp. 48-56 ◽  
Author(s):  
Karsten Richter ◽  
Franz Reuther ◽  
Roland Müller
Keyword(s):  
Process Design ◽  
Dimensional Accuracy ◽  
High Strength ◽  
Material Behavior ◽  
High Yield ◽  
Simulation Based ◽  
Bending Process ◽  
The Impact ◽  
Free Bending ◽  
Springback Behavior

One effect of high influence on the dimensional accuracy during bending is springback. It inevitably occurs due to the elastic proportion in the material behavior. The impact is notably high when producing springs made of ultra-high strength spring strips of the steel grade 1.4310 (X10CrNi18-8). The high yield ratio needed to fulfil the functionalities required during application leads to dimensional inaccuracies that have to be compensated during the production process. This paper reports a simulation-based approach to predict the springback behaviour of ultra-high strength spring strips with tensile strengths TS = 1500-1800 MPa. Based on the results of advanced material testing and modelling, the numerical prediction of the springback behavior of an exemplary bending process (free bending) has been investigated in detail. This helps to obtain deeper knowledge and understanding of the springback phenomenon and to achieve suitable strategies for a more efficient industrial tool and process design while processing ultra-high strength spring strips.

scholarly journals Role of Automotive Industry in Global Warming

2019 ◽  
Vol 62 (3) ◽  
pp. 197-201
Author(s):  
Shahid Hussain Abro ◽  
Alidad Chandio ◽  
Iftikhar Ahmed Channa ◽  
Abdulaziz S. Alaboodi
Keyword(s):  
Air Pollution ◽  
Grain Size ◽  
Global Warming ◽  
Automotive Industry ◽  
High Strength ◽  
Chemical Compositions ◽  
Light Weight ◽  
Grain Sizes ◽  
Heat Treated

Global warming and air pollution by human made gases such as CO2, is mainly produced by automotive industry that results in great risk for human health. The aim of this study is to reduce the above problem by using the high strength materials with low density in the manufacturing of automotive vehicles. An approach applied here is to enhance the strength by reducing the grain size, lowering the density and increasing elongation. Four steel samples with different chemical compositions were selected. Samples were heat treated from 850 °C to 1250 °C and cooled in water. Grain size distribution was calculated using matrox inspector software and result was plotted using origin. It was found that 850 °C has lowest and 1250 °C has highest grain sizes. Strength of steel can be increased not only by adding the alloying elements but also by controlling grain size. Light weight material consumes lower fuel and emits lower CO2, thus it minimizes the global warming and air pollution.  

Bendability of Ultra-High-Strength Steel

2009 ◽  
Vol 410-411 ◽  
pp. 611-620 ◽  
Author(s):  
Anu Väisänen ◽  
Kari Mäntyjärvi ◽  
Jussi A. Karjalainen
Keyword(s):  
High Strength ◽  
Experimental Tests ◽  
Fe Analysis ◽  
Large Radius ◽  
Test Results ◽  
Complex Phase ◽  
Air Bending ◽  
Ultra High Strength Steel ◽  
Bending Process ◽  
Punch Radius

Utilisation of ultra-high-strength (UHS) steels is rapidly spreading from the automotive industry into many other application areas. It is necessary to know how these materials behave in common production processes such as air bending. The bendability of UHS steels is much lower compared to normal and high-strength construction steels. In this work, experimental tests were carried out using complex phase (CP) bainitic-martensitic UHS steels (YS/TS 960/1000 and 1100/1250) and S650MC HS steel in order to inspect material bendability and possible problems in the bending process. Mechanical and geometrical damages were registered and classified. The bending method used was air bending and press brake bending with an elastic lower die. The FE analysis was used to understand the stress state at different points in the material and build-up of failure. As UHS steels cannot stand large local strains, a large radius must be used in air bending. The results show that even when a large radius is used in air bending, the strain is not evenly distributed; there is a clear high strain area in the middle of the bend. It was also possible to simulate the other phenomena occurring in experimental tests, such as losing contact with the punch and ‘nut-like’ geometry, using FE analysis. Experimental test results also show that by using an elastic lower die, it is possible to avoid unwanted phenomena and obtain an almost 50% smaller punch radius, but the required force is 50% bigger than that required in air bending.

Analysis on Fiber Laser Welding of MS1470 Steel

2011 ◽  
Vol 328-330 ◽  
pp. 487-491
Author(s):  
Ya Jie Li ◽  
Li Jun Xin ◽  
Zhi Yong Wang
Keyword(s):  
Automotive Industry ◽  
Low Cost ◽  
Welding Process ◽  
High Strength ◽  
Fracture Morphology ◽  
Rolling Process ◽  
Light Weight ◽  
Lower Intensity ◽  
Fiber Laser Welding ◽  
Fracture Failure

MS1470 steel is mainly used in the automotive industry, which has high strength, light weight and low cost. However, there always appear grains coarsening, brittle increasing, lower intensity and other issues. To solve this problem, we have analyzed the welding process, the fracture morphology and microstructure etc. The results shown that the microstructure were mainly ferrites and lath martensites. However, grains coarsening in the HAZ were serious, and fracture failure also occurred in the heat affected zone. Meanwhile, MS1470 steel had formed a small amount of pores during rolling process, which also is an important reason for cracks formation.

scholarly journals Research on Hydraulic Push-Pull Bending Process of Ultra-Thin-Walled Tubes

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1932
Author(s):  
Xin Zhang ◽  
Changcai Zhao ◽  
Bing Du ◽  
Duan Chen ◽  
Yang Li ◽  
...  
Keyword(s):  
Internal Pressure ◽  
High Performance ◽  
High Strength ◽  
Combined Loading ◽  
Optimum Process ◽  
Hydraulic Pressure ◽  
Fe Model ◽  
Bending Process ◽  
Thin Walled Tube ◽  
Thin Walled

Due to their high strength, high performance, and lightweight characteristics, bent tubes are widely used in many high-end industries, such as aviation, aerospace, shipbuilding, automobile, and petrochemical industries. Ultra-thin-walled (thickness-to-diameter ratio t/D < 0.01) bent tubes are more prone to wrinkling, fracture, and cross-section distortion than ordinary bent tubes, which are difficult to form integrally by traditional bending processes. In this paper, a new bending process with combined loading of hydraulic pressure, push, and pull was proposed to provide a new method for the bending of ultra-thin-walled tube. This process is characterized by the ability to optimize the combination of push, pull, and internal pressure according to the actual bending process in order to minimize the wrinkling of ultra-thin-walled tube during bending. Based on ABAQUS finite element (FE) software, the FE model of the hydraulic push-pull bending process for ultra-thin-walled tube was established. The influence of internal pressure, die clearance, and friction coefficient on the forming quality of bent tubes was discussed, and the optimum process parameters were obtained. Bent tubes with an initial thickness of 0.3 mm, diameter of 60 mm, and bending radius of 165 mm were manufactured in experiments. Through the comparative analysis of experiment and simulation, the accuracy of the FE simulation was verified.

Simplified springback prediction of thick sandwich panel

2018 ◽  
Vol 22 (4) ◽  
pp. 1019-1038
Author(s):  
Raja Ouled Ahmed Ben Ali ◽  
Sami Chatti
Keyword(s):  
Analytical Model ◽  
Sandwich Panel ◽  
Air Bending ◽  
Bending Process ◽  
Punch Radius ◽  
Springback Prediction ◽  
Important Design ◽  
Springback Behavior ◽  
Foam Thickness ◽  
Good Agreement

Springback is one of the most important design behavior in air-bending processes. The sandwich panel exhibits more complicated bending and springback behavior due to substantial differences in mechanical properties between the foam core and the metallic skin sheet. In this paper, we will not only propose a semi-analytical model in order to easily predict springback in air-bending process of steel/polyurethane/steel sandwich panel, but also we will carry out experiments to measure springback amount. The semi-analytical model results and the experiment findings proved to be in a good agreement. In addition, numerical simulations and experiments were conducted to investigate the effects of punch radius, die opening, and the foam thickness on springback.

Sign in / Sign up

Export Citation Format

Share Document