scholarly journals Springback compensation of high strength 21-6-9 tube after NC bending

2020 ◽  
Vol 1676 ◽  
pp. 012045
Author(s):  
Jun Fang ◽  
Fang Ouyang ◽  
Shiqiang Lu
Keyword(s):  
High Strength ◽  
Springback Compensation ◽  
Nc Bending

An Enhanced Hybrid Springback Compensation Approach: Springback Path – Displacement Adjustment Method For Complex Shaped Products of Sheet Metal Forming

2021 ◽  
Author(s):  
Zhihui Gong ◽  
Mandeep Singh ◽  
Bohao Fang ◽  
Dongbin Wei
Keyword(s):  
Sheet Metal ◽  
Automobile Industry ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Strength Steels ◽  
Fem Analysis ◽  
High Strength ◽  
Design Stage ◽  
Springback Compensation ◽  
Compensation Approach

Abstract Springback compensation is critical in sheet metal forming. Advanced techniques have been adopted in the design stage of various sheet metal forming processes, e.g. stamping, some of which are for complex shaped products. However, the currently available numerical approaches are not always sufficiently accurate and reliable. To improve the accuracy of springback compensation, an enhanced hybrid springback compensation method named Springback Path – Displacement Adjustment (SP-DA) method has been developed in this study based on the well-known conventional displacement adjustment (DA) method. Its effectiveness is demonstrated using FEM analysis of low, medium and high strength steels adopted in automobile industry, in which a symmetrical model owning geometry complexity similar to an auto body panel was established. The results show this new enhanced SP-DA method is able to significantly improve the accuracy of springback compensation comparing to conventional displacement adjustment technique.

The Influence of Cold Forming Conception on the Springback Magnitude

2013 ◽  
Vol 554-557 ◽  
pp. 2299-2311
Author(s):  
Paweł Bałon ◽  
Andrzej Świątoniowski
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulations ◽  
Design Process ◽  
High Strength ◽  
Cold Forming ◽  
Springback Compensation ◽  
Special Cases ◽  
Trial Test

Cold forming, especially for steels of increased mechanical properties, encounters problem with a springback. Most of the tools require compensation of that effect, however it is not always feasible in a conventional way. In some special cases such as twisting springback, compensation of a tool remains an ineffective method of solving the problem. This paper aims to investigate the behaviour of springback deviation which may be reduced using the change of forming conception such as: crash forming, holding and stamping or stamping with pad. The results lead to an in-depth understanding of the design process and parameters for advanced high strength components. It is immensely important for tool shops which usually have only few weeks to make a tool. The essence of designing and numerical simulations must be emphasized. Without them some problems with twisting springback may be encountered during trial test what would involve labour absorbing corrections and some extra costs. Therefore, it is crucial to pay attention to forming conception, as using it we can obtain entirely different

Springback Compensation for Ultra High Strength Stamping

2003 ◽  
Author(s):  
Lumin Geng ◽  
Chung-Yeh Sa ◽  
Thomas Oetjens ◽  
Kunmin Zhao
Keyword(s):  
High Strength ◽  
Springback Compensation

scholarly journals AHSS AUTO STAMPING CHALLENGES: RECTIFYING SPRINGBACK

2015 ◽  
Vol 77 (4) ◽  
Author(s):  
S. Mohtar ◽  
N. Baluch ◽  
C. S. Abdullah
Keyword(s):  
Energy Management ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength Steel ◽  
High Strength ◽  
Energy Requirements ◽  
Advanced High Strength Steel ◽  
Springback Compensation ◽  
And Control

To improve crash worthiness and fuel economy, the automotive industry is, increasingly, using Advanced High Strength Steel (AHSS). The main reason to utilize AHSS is their better performance in crash energy management, which allows one to down gauge with AHSS. In addition, these engineered AHSS address the automotive industry’s need for steels with higher strength and enhanced formability. The improved capabilities the AHSS bring to the automotive industry do not bring new forming problems but certainly accentuate problems already existing with the application of any higher strength steel. These concerns include higher loads on presses and tools, greater energy requirements, and increased need for springback compensation and control. Springback problem, consistently, is one of the leading roadblocks hindering auto stamping productivity. This paper describes the origins and types of springback, characterizes what causes it, and elaborates ways to rectify it through, stabilization, compensation, and verification.

Springback Behavior of High Strength Titanium Tube after Bending under Variations of Material Property Parameters

2021 ◽  
Vol 881 ◽  
pp. 13-18
Author(s):  
Jun Fang ◽  
Shi Qiang Lu ◽  
Chuang Liang ◽  
Xu Guang Min
Keyword(s):  
Yield Stress ◽  
Young’S Modulus ◽  
Material Property ◽  
Young's Modulus ◽  
High Strength ◽  
Numerical Control ◽  
Fe Model ◽  
Strength Coefficient ◽  
Springback Behavior ◽  
Nc Bending

In order to reveal the springback behavior of high strength TA18 tube after numerical control (NC) bending under the variations of material property parameters, the finite element (FE) model of the whole process for the high strength TA18 tube during NC bending was established under ABAQUS code and its stability was evaluated. Then, using the model, the springback behavior after tube bending under the variations of material property parameters was studied, and the significance of material property parameters on springback was revealed. The results show that the springback angle decreases with the increase of the Young’s modulus, hardening exponent and thickness anisotropy exponent or with the decrease of the strength coefficient and yield stress. The significance of material property parameters on springback of the high strength TA18 tube after NC bending from high to low are the yield stress, Young’s modulus, strength coefficient, thickness anisotropy exponent and hardening exponent.

Effect of Boosting Velocity on Forming Quality of High-Strength TA18 Titanium Alloy Tubes in Numerical Control Bending

2017 ◽  
Vol 748 ◽  
pp. 197-201 ◽  
Author(s):  
Jun Fang ◽  
Chuang Liang ◽  
Shi Qiang Lu ◽  
Ke Lu Wang
Keyword(s):  
Cross Section ◽  
Three Dimensional ◽  
High Strength ◽  
Numerical Control ◽  
Wall Thickening ◽  
Fe Model ◽  
Forming Quality ◽  
Wall Thinning ◽  
Nc Bending

In order to reveal the effect laws of boosting velocity on forming quality of tube bending. A three dimensional (3D) elastic plastic finite element (FE) model of whole process of high-strength TA18 tubes in numerical control (NC) bending was established based on the FE code of ABAQUS, and its reliability was validated by using the experimental results in literature. Then, the effect laws of boosting velocity on deformation behaviors of high-strength TA18 tubes in NC bending were explored with respect to multiple defects such as wall thinning, wall thickening, cross section deformation and springback. The results show that wall thinning ratio decreases with the increasing of boosting velocity; wall thickening ratio increases with the increasing of boosting velocity; cross section deformation ratio decreases with the increasing of boosting velocity; springback decreases slightly with the increasing of boosting velocity.

Geometrical Springback Compensation Algorithm Based on UV Curves for Automobile Structure Parts Die-Face

2012 ◽  
Vol 472-475 ◽  
pp. 477-483
Author(s):  
Gui Li ◽  
Yu Qi Liu ◽  
Heng Jian Xu
Keyword(s):  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Structure ◽  
High Strength ◽  
Springback Compensation ◽  
Compensation Algorithm ◽  
Spline Surface ◽  
Search Approach ◽  
Bézier Spline ◽  
Common Defect

Springback is the most common defect in sheet metal forming. The compensation method is an effective way to overcome this defect by modifying the die-face. A new geometrical springback compensation algorithm based on UV curves is proposed for automobile structure die-face. The UV discrete technology and space lattice search approach are adopted to get the regular springback lattices from irregular and unordered springback points. The compensation direction and the correction of the pressing direction are considered. The die-face is reconstructed with a high order BEZIER spline surface on the CATIA platform. The high quality geometry compensation die-face obtained from this algorithm can be applied directly in actual machining. The geometry springback compensation of a high strength steel structure part is used to verify the effectiveness of the algorithm.

scholarly journals Wall thinning behaviors of high strength 0Cr21Ni6Mn9N tube in numerical control bending considering variation of elastic modulus

2021 ◽  
Vol 13 (5) ◽  
pp. 168781402110212
Author(s):  
Jun Fang ◽  
Fang Ouyang ◽  
Shiqiang Lu ◽  
Kelu Wang ◽  
Xuguang Min ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Process Parameters ◽  
Thickness Distribution ◽  
High Strength ◽  
Numerical Control ◽  
Stainless Steel Tube ◽  
Fe Model ◽  
Tube Bending ◽  
Wall Thinning ◽  
Nc Bending

Wall thinning, as one of the key defects in tube bending determined the forming quality and limit, is more easily to occur due to the specific properties of high strength 0Cr21Ni6Mn9N stainless steel tube (0Cr21Ni6Mn9N-HS tube). To achieve tube accuracy numerical control (NC) bending forming, the wall thinning characteristics of the 0Cr21Ni6Mn9N-HS tube should be clarified. An analytical model was proposed to reveal the essential relation between tube parameters and wall thickness distribution. Considering the varied elastic modulus, a finite element (FE) model was applied to explore the wall thinning under different geometrical and process parameters. Using the modified multi-parameter sensitivity analysis method combined with FE simulation, the sensitivity of the wall thinning to geometrical and process parameters was carried out. The experiments of NC tube bending were conducted to validate the analytical and simulate results. The results show that the varied elastic modulus can enhance the wall thinning degree, but has no obvious effect on wall thinning characteristics. The wall thinning characteristics under different geometrical and process parameters are revealed and the reasonable parameters ranges for the 0Cr21Ni6Mn9N-HS tube in NC bending are obtained. The most sensitive parameter on wall thinning is the relative bending radius, while the bending angle is the least one.

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