Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (8): 2174-2180.doi: 10.13229/j.cnki.jdxbgxb.20221303

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Process optimization for slip-line defects in automobile hood edge drawing

Ji-cai LIANG(),Qing-yu ZHANG,Ce LIANG()   

  1. College of Materials Science and Engineering，Jilin University，Changchun 130022，China
  • Received:2022-10-06 Online:2024-08-01 Published:2024-08-30
  • Contact: Ce LIANG E-mail:liangjicai@126.com;liangce@jlu.edu.cn

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Abstract:

Aiming at the problem that the slip line defects are easy to occur at the sharp edges in the drawing process of automobile hood outer panel， the process parameters that may cause appearance defects were studied. Firstly， the influence of blank holder force， friction coefficient， drawbead strength and stamping direction on the forming of engine hood outer panel is studied by using the single factor variable method， and the primary and secondary order of each factor affecting the slip line and the approximate range of good drawing forming are determined. Then， orthogonal experiment method and range analysis are used to find the optimal level combination. The research results show that the application of numerical simulation technology can improve the forming quality of engine hood outer plate， reduce the number of die tests， shorten the production cycle and reduce the production cost. The reasonable combination of process parameters can optimize the slip line defects and increase the control method of slip line defects.

Key words: automobile, hood, sharp edge forming, technological research

CLC Number: 

  • TG385

Fig.1

Geometric model of engine cover of an SUV and section of ridge line"

Table 1

Anisotropy coefficient and initial yield stress"

角度/（°）各向异性系数初始屈服应力/MPa
01.87167.9
451.3193.7
902.14171.7

Fig.2

Finite element model"

Fig.3

Stamping angle is a variable simulation result"

Table 2

Influence of the punch angle on the slip line"

冲压角度/（°）滑移线极大值/mm成形效果
-918.65较好
-1018.08较好
-1117.85较好
-1223.50较好
-1328.46拉裂
-1426.66拉裂
-1534.32较好
-1621.85较好

Table 3

Effect of the crimp force on the slip line"

压边力／kN滑移线极大值/mm成形效果
200013.94拉延不充分
250016.38拉延不充分
300017.04较好
350020.23拉裂

Table 4

Effect of extensions on slip lines"

前后拉延筋强度滑移线极大值/mm成形效果
零度15.97拉延不充分
轻度16.38拉延不充分
中度17.02拉延不充分
重度21.50拉裂
两侧拉延筋强度滑移线极大值/mm成形效果
零度15.51拉延不充分
轻度17.03较好
中度18.07较好
重度19.21较好
锁死19.33较好

Fig.4

BHF is a variable simulation result"

Fig.5

Drawing bar layout"

Fig.6

Simulation results of drawbead as variables"

Table 5

Factor level table"

因素水平
123
压边力/kN2 0002 2502 500
摩擦系数0.150.160.17
拉延筋强度中度重度锁死

Table 6

Orthogonal test results"

试验编号压边力/kN摩擦系数拉延筋强度试验结果
111119.76
212221.13
313321.19
421221.00
522320.93
623118.99
731320.81
832119.00
933219.40
均值131.33731.74032.683
均值232.99033.36731.127
均值334.68733.90735.203
极差3.3502.1674.076

Fig.7

Simulation of orthogonal experiment results"

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