Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1272-1279.doi: 10.13229/j.cnki.jdxbgxb20180146

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Trajectory design and FE simulation for profile stretch bending based on incremental control method

Xue⁃guang ZHANG1,2(),Ming⁃meng JIA3,Chun⁃guo LIU2,Guang⁃zhong HE1   

  1. 1. Engineering Planning and Development Department, CRRC Changchun Railway Vehicles Co. , Ltd. , Changchun 130051, China
    2. Rolling Forming Research Institute, Jilin University, Changchun 130022, China
    3. College of Automotive Engineering, Jilin Communication Polytechnic, Changchun 130012, China
  • Received:2018-02-04 Online:2019-07-01 Published:2019-07-16

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Abstract:

According to the structure of the stretch bending equipment and the loading condition, the loading capacity of the jaw is equated to the tensile strength of the drawing cylinder and rotation angle of the turning arm, and a trajectory design method for profile stretch bending based on incremental control is proposed. By dividing the target shape into several forming sections and calculating the tensile strength increment and rotation angle increment, the independent distribution and control of the loading capacity are realized. The Z-shaped stainless steel curved roof beam is selected as the research object. The profile stretch bending FE simulation model composed of connector units is established. The calculated loading increment is applied in predicting the forming effects of the workpiece, which realizes the parameterized regulation of the loading trajectory. The forming defect analysis and pertinent modification are conducted according to the shape error and the surface warpage in the simulation results, which improve the forming effects. The modified trajectory is adopted in the forming test, and the simulation results meet well with the experimental results.

Key words: material synthesis and processing technology, profile stretch bending, trajectory design, incremental control, numerical simulation

CLC Number: 

  • TG386

Fig.1

Schematic diagram of stretch?wrap bending machine"

Fig.2

Schematic diagram of load increment in forming section"

Fig.3

Target shape and cross?section size of workpiece"

Fig.4

Stretch bending FE model based on connector units"

Fig.5

Loading data of drawing cylinder and turning arm"

Fig.6

Forming effects of workpiece"

Fig.7

Loading data comparison of drawing cylinder and turning arm"

Fig.8

Movement trajectory comparison of profile end"

Table 1

Comparison of forming effects of workpiece"

轨迹 最大主应变 回弹后曲率/mm

表面翘曲

/mm

形状误差

/mm
大弧 小弧 大弧 小弧
原拉弯 0.033 0.273 7068.2 351.4 3.44 4.16
修正后 0.107 0.214 7024.0 350.9 1.09 1.34

Fig.9

Stretch bending experiment"

Fig.10

Experimental workpiece"

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