Abstract
This study proposes an electromagnetic-assisted stamping (EMAS) method with magnetic-force loading at the sheet end in order to control the springback phenomenon. The new method does not change the structure of the mold and does not generate a magnetic force at the sheet corner compared to traditional EMAS. Thus, the new approach could greatly extend the mold lifespan and could be readily adopted in commercial production environments. The effects of technological parameters, such as the distance between the blank holder and die, discharge voltage, and sheet thickness on the springback phenomenon were analyzed. Our results suggest that tangential stress and elastic strain energy both decrease with the increase of discharge voltage. The simulation method accurately predicted the deformation of the sheet during the quasi-static stamping and dynamic magnetic forming processes. The simulation and experimental results both show that as the discharge voltage increases, the bent angle after springback decreases.
Highlights
Sheet metal forming is an important processing method that is widely used in the automotive, aerospace, shipbuilding, and electrical industries
Due to forming method 2 being easy to realize, this paper analyzes the effect of the distance between the blank holder and die and discharge voltage on springback reduction based on forming method 2
A new springback control method for L-shaped parts using Electromagnetic forming (EMF) was proposed in this paper
Summary
Sheet metal forming is an important processing method that is widely used in the automotive, aerospace, shipbuilding, and electrical industries. Established an L-shaped parts bending method and evaluated the effect of magnetic forces on the springback reduction of DP600 high-strength steel and 5754 aluminum alloy. To explore the mechanism of the springback reduction during electromagnetic forming, Cui et al [18,19] found that high-frequency oscillations occur in the sheet bending region, and the tangential stress decreases sharply after the electromagnetic coil is discharged. A new simulation method for modeling the EMF process based on shell elements is proposed and used to predict the accuracy of forming process and springback during the quasi-static stamping
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