等静压支撑单点增量成形力的研究
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摘要
在单点增量成形过程中,板料背面悬空不受任何支撑,仅依靠工具头和板料之间的挤压作用对板料进行无约束成形,易造成板料成形精度不高。本文提出了一种等静压支撑单点增量成形新技术,在成形过程中为板料提供有效支撑。以1060铝板为研究对象,分析等静压参数对成形力的影响规律。结果表明:静压支撑单点增量成形,水平方向的力F_x和F_y较传统的单点增量成形有一定的增加,但增加幅度不大,轴向力F_z变化比较大,随着静压的不断增加,轴向力不断增大。设计开发静压系统,通过实验验证,获得静压条件下成形力的变化规律,并验证了仿真的正确性。
In the single-point incremental forming process, the back side of the sheet metal is not supported by any support, and the sheet metal is unconstrained between the tool head and the sheet metal, which is easy to cause the sheet forming precision to decrease. A new technique for isostatic pressing support in single point incremental forming is proposed, which provides the effective support for the sheet metal in the forming process. The influence law of the isostatic pressure parameters on the forming force of 1060 aluminum plate was analyzed. The results show that the single-point incremental forming of static pressure support has a certain increase in the force of F_x and F_y in the horizontal direction being compared with the traditional single-point incremental forming, but the increase is not large, and the axial force F_z changes greatly. As the static pressure increases, the axial force increases. The static pressure system was designed and developed, and the variation of the experimental forming force under static pressure was obtained, and the correctness of the simulation was verified.
In the single-point incremental forming process, the back side of the sheet metal is not supported by any support, and the sheet metal is unconstrained between the tool head and the sheet metal, which is easy to cause the sheet forming precision to decrease. A new technique for isostatic pressing support in single point incremental forming is proposed, which provides the effective support for the sheet metal in the forming process. The influence law of the isostatic pressure parameters on the forming force of 1060 aluminum plate was analyzed. The results show that the single-point incremental forming of static pressure support has a certain increase in the force of F_x and F_y in the horizontal direction being compared with the traditional single-point incremental forming, but the increase is not large, and the axial force F_z changes greatly. As the static pressure increases, the axial force increases. The static pressure system was designed and developed, and the variation of the experimental forming force under static pressure was obtained, and the correctness of the simulation was verified.
引文
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[9] Bagudanch I,Centeno G,Vallellano C,et al.Forming force in single point incremental forming under different bending conditions[J].Procedia Engineering,2013,63:354-360
[10] Belchior J,Guillo M,Courteille E,et al.Off-line compensation of the tool path deviations on robotic machining:application to incremental sheet forming[J].Robotics and Computer-Integrated Manufacturing,2013,29(4):58-69
[11] Centeno G,Bagudanch I,Martínez-Donaire A J,et al.Critical analysis of necking and fracture limit strains and forming forces in single-point incremental forming[J].Materials & Design,2014,63:20-29
[12] Wang J,Nair M,Zhang Y.An efficient force prediction strategy in single point incremental sheet forming[J].Procedia Manufacturing,2016,5:761-771
[13] Bansal A,Lingam R,Yadav S K,et al.Prediction of forming forces in single point incremental forming[J].Journal of Manufacturing Processes,2017,28:486-493
[14] Li P Y,He J,Liu Q,et al.Evaluation of forming forces in ultrasonic incremental sheet metal forming[J].Aerospace Science and Technology,2017,63:132-139
[15] 谷岩波,王辉,王会廷,等.AA5754铝合金板材渐进成形壁厚均匀性研究[J].锻压技术,2018,43(1):33-41Gu Y B,Wang H,Wang H T,et al.Study on wall thickness uniformity in incremental forming for aluminum alloy AA5754 sheet[J].Forging & Stamping Technology,2018,43(1):33-41 (in Chinese)
[2] 李燕乐,陈晓晓,李方义,等.金属板材数控渐进成形工艺的研究进展[J].精密成形工程,2017,9(1):1-9Li Y L,Chen X X,Li F Y,et al.Research development on incremental sheet metal forming process[J].Journal of Netshape Forming Engineering,2017,9(1):1-9 (in Chinese)
[3] Guzmán C F,Gu J,Duflou J,et al.Study of the geometrical inaccuracy on a SPIF two-slope pyramid by finite element simulations[J].International Journal of Solids and Structures,2012,49(25):3594-3604
[4] Petek A,Kuzman K,Kopa■.Deformations and forces analysis of single point incremental sheet metal forming[J].Archives of Materials Science and Engineering,2009,35(2):107-116
[5] Eyckens P,Duflou J,Van Bael A,et al.The significance of friction in the single point incremental forming process[J].International Journal of Material Forming,2010,3(S1):947-950
[6] 蔡改贫,张仲凯,姜志宏.金属板材振动单点渐进成形力学分析[J].机械科学与技术,2010,29(7):915-920Cai G P,Zhang Z K,Jiang Z H.Mechanical analysis of sheet metal vibration incremental forming[J].Mechanical Science and Technology for Aerospace Engineering,2010,29(7):915-920 (in Chinese)
[7] Henrard C,Bouffioux C,Eyckens P,et al.Forming forces in single point incremental forming:prediction by finite element simulations,validation and sensitivity[J].Computational Mechanics,2011,47(5):573-590
[8] 蔡改贫,邢聪文,罗小燕,等.板料多点渐进成形力多通道数据采集装置设计[J].中国机械工程,2012,23(24):2913-2917Cai G P,Xing C W,Luo X Y,et al.Design of multi-channel data acquisition device for sheet metal multiple point incremental forming force[J].China Mechanical Engineering,2012,23(24):2913-2917 (in Chinese)
[9] Bagudanch I,Centeno G,Vallellano C,et al.Forming force in single point incremental forming under different bending conditions[J].Procedia Engineering,2013,63:354-360
[10] Belchior J,Guillo M,Courteille E,et al.Off-line compensation of the tool path deviations on robotic machining:application to incremental sheet forming[J].Robotics and Computer-Integrated Manufacturing,2013,29(4):58-69
[11] Centeno G,Bagudanch I,Martínez-Donaire A J,et al.Critical analysis of necking and fracture limit strains and forming forces in single-point incremental forming[J].Materials & Design,2014,63:20-29
[12] Wang J,Nair M,Zhang Y.An efficient force prediction strategy in single point incremental sheet forming[J].Procedia Manufacturing,2016,5:761-771
[13] Bansal A,Lingam R,Yadav S K,et al.Prediction of forming forces in single point incremental forming[J].Journal of Manufacturing Processes,2017,28:486-493
[14] Li P Y,He J,Liu Q,et al.Evaluation of forming forces in ultrasonic incremental sheet metal forming[J].Aerospace Science and Technology,2017,63:132-139
[15] 谷岩波,王辉,王会廷,等.AA5754铝合金板材渐进成形壁厚均匀性研究[J].锻压技术,2018,43(1):33-41Gu Y B,Wang H,Wang H T,et al.Study on wall thickness uniformity in incremental forming for aluminum alloy AA5754 sheet[J].Forging & Stamping Technology,2018,43(1):33-41 (in Chinese)
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