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

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

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.

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.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

The Nature of Delta Phase Precipitation in Inconel 718

1982 ◽  
Vol 40 ◽  
pp. 724-725
Author(s):  
L. S. Lin ◽  
C. C. Law
Keyword(s):  
Inconel 718 ◽  
Base Alloy ◽  
High Strength ◽  
Physical Metallurgy ◽  
Nickel Base Alloy ◽  
Phase Precipitation ◽  
Weight Percentage ◽  
Delta Phase ◽  
The Subject ◽  
Nickel Base

Inconel 718, a precipitation hardenable nickel-base alloy, is a versatile high strength, weldable wrought alloy that is used in the gas turbine industry for components operated at temperatures up to about 1300°F. The nominal chemical composition is 0.6A1-0.9Ti-19.OCr-18.0Fe-3Mo-5.2(Cb + Ta)- 0.1C with the balance Ni (in weight percentage). The physical metallurgy of IN 718 has been the subject of a number of investigations and it is now established that hardening is due, primarily, to the formation of metastable, disc-shaped γ" an ordered body-centered tetragonal structure (DO2 2 type superlattice).

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