锻压技术

润滑条件对不锈钢管材推弯成形质量的影响

英文标题：Influence of lubrication condition on forming quality of push-bending stainless steel tubes

作者：陈国清王惠敏李鸿翔唐睿周文龙

分类号：TG386

出版年,卷(期):页码：2016,41(11):115-120

摘要：

基于MSC.MARC有限元软件建立了推弯成形有限元模型，采用实验与数值模拟相结合的方法研究了不锈钢管材推弯成形工艺过程。结果表明：在管材内、外侧壁厚与应力分布规律方面，有限元模拟和实验研究的结果一致，且外侧脊线的残余压应力随所处位置角度的增加而先增加后减小，在一定位置又再次增加，验证了模型的可靠性。通过研究不同摩擦系数与润滑条件下管材内、外侧壁厚与椭圆度的变化规律，得到润滑条件对推弯成形质量的影响。研究表明，在一定范围内，管材外侧壁的壁厚减薄量随着摩擦系数的增加而减小，但是内侧壁壁厚增厚则随着摩擦系数的增加而加剧，管材端面椭圆度随摩擦系数的增加而略有减小。在大弯曲半径推弯时，良好的润滑条件有利于减轻内侧壁增厚问题且能获得更好的成形质量。

The finite element model of push-bending for stainless steel tubes was set up based on software MSC.MARC, and its process was studied by combining experiment with finite element (FE). The results show that the experiment results are consistent with the simulation results both in the wall thickness and the stress distribution, and the residual compressive stress at the extrados of tube increases firstly, then decreases with increase of the angle of location, subsequently increases again at a certain location, so the reliability of established FE-model is verified. Furthermore, the influences of lubrication on the push-bending quality were obtained by research on the regulation of wall thickness and the ovality under different friction coefficients and lubricating conditions. The research results also show that the exterior wall thickness thinning rate decreases with increase of the friction coefficient at a certain degree, but the interior wall thickness thickening rate increases, and the ovality of the tube end face decreases slightly. However, when the tubes are push-bent at a large radius, a good lubricating condition can reduce the wall thickening problem at the intrados and ensure a better forming quality.

基金项目：

国家国际科技合作专项项目（2015DFR60370）；中央高校基本科研业务费专项资金（DUT14YQ105）

陈国清（1977-），男，博士，教授

参考文献：

［1］Yang H，Li H，Zhang Z，et al. Advances and trends on tube bending forming technologies[J]. Chinese Journal of Aeronautics，2012，25(1): 1-12.
［2］詹梅，杨合，江志强. 管材弯曲成形的国内外研究现状及发展趋势[J]. 机械科学与技术，2004，23(12)：1509-1514.Zhan M，Yang H，Jiang Z Q. State of the art of research on tube bending process[J]. Mechanical Science and Technology，2004，23(12): 1509-1514.
［3］孙振忠，杨玉英. 铝型材推弯工艺 [J]. 中国有色金属学报，2004，14(10)：1677-1682.Sun Z Z，Yang Y Y. Push-bending process of aluminum profile[J]. The Chinese Journal of Nonferrous Metals，2004，14(10): 1677-1682.
［4］梁正龙，吴建军，张增坤，等. 助推对薄壁不锈钢管绕弯成形质量的影响[J]. 塑性工程学报，2015，22(3):68-73.Liang Z L，Wu J J，Zhang Z K，et al. Influence of boosting on forming quality of rotary draw bending for stainless thin-walled circular tube[J]. Journal of Plasticity Engineering，2015，22(3): 68-73.
［5］徐建美，王克鲁，方军，等. 间隙对0Cr21Ni6Mn9N不锈钢管材数控弯曲截面质量的影响[J]. 锻压技术，2014，39(5)：132-137.Xu J M， Wang K L， Fang J，et al. Effect of clearance on cross section quality of 0Cr21Ni6Mn9N stainless steel tube in NC bending process[J]. Forging & Stamping Technology，2014，39(5): 132-137.
［6］贾震，董文芳，韩志仁，等. 5B02铝合金管件直角推弯成形壁厚均匀性[J]. 塑性工程学报， 2015，22(2)：90-94，110. Jia Z，Dong W F，Han Z R，et al. Study on wall thickness uniformity of 5B02 aluminum tube in push-bending[J]. Journal of Plasticity Engineering，2015，22(2):90-94，110.
［7］Xiao X T， Liao Y J， Sun Y S，et al. Study on varying curvature push-bending technique of rectangular section tube[J]. Journal of Materials Processing Technology,2007，187-188: 476-479.
［8］Wang D，Yang H，Li H. Advance and trend of friction study in plastic forming[J]. Transactions of Nonferrous Metals Society of China, 2014，24(5): 1263-1272.
［9］江志强，杨合，詹梅，等. 模具与管材不同配合条件下中强TA18厚壁钛管数控弯曲变形行为[J]. 塑性工程学报，2011，18(1)：21-27.Jiang Z Q，Yang H，Zhan M，et al. Deformation behaviors of medium-strength TA18 thick-walled tubes during NC bending under various contact conditions between tube and dies[J]. Journal of Plasticity Engineering，2011，18(1):21-27.
［10］杨雪. 弯头冷推制工艺毛坯及工艺参数优化[D]. 秦皇岛：燕山大学，2013.Yang X. Optimizationn on Blank and Technology Parameters for Elbow Cold Pushing Process[D].Qinhuangdao: Yanshan University， 2013.
［11］曾元松，李志强. 铝合金小弯曲半径管内压推弯成形过程的数值模拟[J]. 塑性工程学报, 2003，10(2)：14-17.Zeng Y S，Li Z Q. The numerical simulation of inner pressure push-bending process for aluminum tube under small radius[J]. Journal of Plasticity Engineering，2003，10(2):14-17.

服务与反馈：

【文章下载】【加入收藏】