Springback Compensation of Sheet Metal Bending Process Based on DOE &amp; ANN

An, Jae-Hong; Ko, Dae-Cheol; Lee, Chan-Joo; Kim, Byung-Min

doi:10.3795/ksme-a.2008.32.11.990

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…However, these types of UHSS also have drawbacks such as limited formability, which causes fracture and severe springback during forming at room temperature [2,3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of weldability for resistance spot welded single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets

et al. 2011

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Recently, in the automotive industry, Al-coated boron steel sheets (22MnB5) have been used for hot stamping, and the use of these sheets makes it possible to achieve a tensile strength of over 1,500 MPa, since a metallurgical transformation from austenite to martensite occurs during the process. In this study, resistance spot welding (RSW) experiments were performed in order to evaluate the weldability of single-lap joints between GA780DP and 22MnB5. The effect of the weld current on the nugget diameter and load-carrying capacity was evaluated by observing the nugget diameter and performing a tensile-shear test. Furthermore, the fracture behavior was evaluated by carrying out optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) observations. Ductile regions were observed on the interfacially fractured surface of the weld, and this implies that a high load-carrying capacity can be obtained even when interfacial fracture (IF) occurs. IF is caused by the stress concentration resulting from the presence of the sharp notch at the boundary of the nugget as well as by the high hardness and the brittle microstructure of the weld; the microstructure is brittle because of the high carbon equivalent (C eq ) and the penetration of Al in the weld.

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“…However, these types of UHSS also have drawbacks such as limited formability, which causes fracture and severe springback during forming at room temperature [2,3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of weldability for resistance spot welded single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets

et al. 2011

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“…This pipe bending process has a residual stress by the plastic deformation of the pipe, so the residual stress is a major cause of the pipe break due to fatigue. Especially, the phenomena like as a visual wrinkle, spring back, ovalization are often happened during the pipe bending process [1][2][3]. However, there is few research on the bending machine which can control precisely the soft pipe during the pipe bending process.…”

Section: Introductionmentioning

confidence: 99%

Development of the Soft Pipe Bending Machine with Thickness Guarantee

Jung

Jeong

Cho

2013

AMR

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A Soft bending pipe is widely used for freezing equipment and shipbuilding. This pipe has some problems such that outside wrinkle, crack, phenomenon of thinning wall. However, the bending machine that can completely solve the problems is not yet. In this study, we have manufactured the self-made mandrel to guarantee both roundness and thickness of the pipe in the bending process for a soft pipe such as a copper pipe. The mandrel consisted of a ball, stick and connection pin. Also, we have manufactured the bending machine that can decrease friction between the pipe and the bending die. The experiment was tried to verify the performance of the mandrel and the pusher to the thickness guarantee of the pipe.

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