Study on Process Parameters in Transverse Bending of Tailor Rolled Blanks

doi:10.12068/j.issn.1005-3026.2019.05.023

Abstract

Abstract: The forming properties and characteristics of tailor rolled blanks(TRB)in transverse bending process were studied by taking U-channel as the research object. The mechanisms of forming defects， including bending springback and thickness transition zone(TTZ)movement etc.， were discussed. On this basis， the special emphasis was put on the effects of process parameters on springback and TTZ movement. Results indicated that the springback of TRB decreases with the increase of blank holder force(BHF)， and this trend is especially prominent for unannealed TRB. Springback decreases first and then increases with the increase of friction coefficient， and increases with the increase of die clearance. TTZ movement decreases first and then increases with the increase of BHF， decreases with the increase of friction coefficient， and it is almost not affected by die clearance. Overall， BHF of (1~4)t， friction coefficient of around 0.12 and die clearance of 2.2~2.4mm are advantageous in controlling springback and TTZ movement.

Key words: tailor rolled blank(TRB), transverse bending, process parameters, annealing, U-channel

CLC Number:

TG386.3

ZHANG Hua-wei， WANG Xin-gang， CHEN Xiao-hui， HOU Dong-xiao. Study on Process Parameters in Transverse Bending of Tailor Rolled Blanks[J]. Journal of Northeastern University Natural Science, 2019, 40(5): 728-733.

References

[1]Merklein M，Johannes M，Lechner M，et al.A review on tailored blanks—production，applications and evaluation［J］.Journal of Materials Processing Technology，2014，214(2):151-164.
[2]Duan L B，Sun G Y，Cui J J，et al.Crashworthiness design of vehicle structure with tailor rolled blank［J］.Structural and Multidisciplinary Optimization，2016，53(2):321-338.
[3]Kim J H，Ko D H，Ko D C， et al.Forming limit diagrams of tailor rolled blank in hot stamping and its verification［J］.Advances in Materials and Processing Technologies，2016，2(4):409-417.
[4]Liu X H，Zhao Q L，Liu L Z.Recent development on theory and application of variable gauge rolling:a review［J］.Acta Metallurgica Sinica(English Letters)，2014，27(3):483-493.
[5]Weinrich A，Becker C，Maevus F，et al.Bending of tailored blanks using elastic tools［J］.Advanced Materials Research，2014，1018:301-308.
[6]孔庆华，张建宇.拼焊板U型件成形性能及焊缝移动规律［J］.中国工程机械学报，2011， 9(2):209-213.(Kong Qing-hua，Zhang Jian-yu.Formability and weld-line movement of U-shape TWB parts［J］.Chinese Journal of Construction Machinery，2011，9(2):209-213.)
[7]Zhang H W，Guan Y P，Wu J L，et al.Transverse bending characteristics in U-channel forming of tailor rolled blank［J］.Journal of Iron and Steel Research International，2016，23(12):1249-1254.
[8]Adnan M，Abdullah A，Samad Z.Springback behavior of AA6061 with non-uniform thickness section using Taguchi method［J］.The International Journal of Advanced Manufacturing Technology， 2016，89(5/6/7/8):2041-2052.
[9]夏元峰.变厚度汽车B柱冲压成形工艺研究及模具设计［D］.哈尔滨:哈尔滨工业大学，2013.(Xia Yuan-feng.Research on stamping process and mold design of B pillar with variable thickness［D］.Harbin:Harbin Institute of Technology，2013.)
[10]崔虎，关建东，康永林.CSP生产SPHC板材的冷轧退火工艺研究［J］.轧钢，2010，27(3):20-23.(Cui Hu，Guan Jian-dong，Kang Yong-lin.Optimization of cold rolling and annealing processes of SPHC strip produced by CSP technology［J］.Steel Rolling，2010，27(3):20-23.)
[11]包向军.变截面薄板弯曲成形回弹的实验研究和数值模拟［D］.上海:上海交通大学，2003.(Bao Xiang-jun.Experimental investigation and numerical simulation of springback in tailor rolled blanks bending［D］.Shanghai:Shanghai Jiaotong University，2003.)
[12]Zhang H W，Liu X H，Liu L Z，et al.Study on nonuniform deformation of tailor rolled blank during uniaxial tension［J］.Acta Metallurgica Sinica(English Letters)，2015，28(9):1198-1204.
[13]Kim D，Kim J，Lee Y，et al.Study of residual stresses in tailor rolled blanked Al5J322T4 sheets［J］.Rare Metals，2006，25(sup2):111-117.
[14]官英平，王立君，吕安松，等.拼焊板V形自由弯曲成形及回弹过程［J］.塑性工程学报，2010，17(6):28-32.(Guan Ying-ping，Wang Li-jun，Lyu An-song，et al.Research on the forming and springback in V-shape free bending of tailor welded blanks［J］.Journal of Plasticity Engineering，2010，17(6):28-32.)
[15]Kim H W，Lim C Y.Annealing of flexible-rolled Al-5.5wt%Mg alloy sheets for auto body application［J］.Materials and Design，2010，31(sup1):71-75.
[16]Lu R H，Liu X H，Xu Z G，et al.Simulation of springback variation in the U-bending of tailor rolled blanks［J］.Journal of the Brazilian Society of Mechanical Sciences and Engineering，2017，39(11):4633-4647.