锻压技术

大型锻压设备承弯组合结构临界预紧参数研究

英文标题：Research on critical preload parameters of bearing-bending composite structure for large forging equipment

作者：董晓传金淼

分类号：TG315.4

出版年,卷(期):页码：2019,44(6):115-121

摘要：

以承弯组合结构的临界预紧参数为研究对象，通过数值模拟分别分析了弯曲模型和压缩模型中间截面处x方向的应力，并将其与Airy应力函数计算的结果进行对比，发现由于应力函数在边界条件处的不完全满足导致产生了误差。由此提出引入梁长的放大比例因子从而弱化边界条件的影响，并分析确定了放大比例因子只与跨高比有关，修正了临界预紧参数计算方程，并与实验进行对比。结果表明，该修正方程的结果与实验值吻合较好，最小误差为5.4%，最大误差为9.4%，能够较好地对承弯组合结构的临界预紧参数进行预测。研究结果为承弯组合结构临界预紧参数计算提供了新的思路。

For the critical preload parameters of bearing-bending composite structure, the stress in the x-direction at the middle section of bending model and compression model was analyzed by numerical simulation, and the results were compared with those calculated by Airy stress function. It is found that the error is caused by the incomplete satisfactions of the stress function at the boundary conditions. Therefore, the magnification factor of
beam length was proposed to weaken the influence of the boundary conditions. And the magnification factor is confirmed that it is only related to the span to height ratio. Furthermore, the calculation equation of the critical preload parameters was modified and compared with the experiment. The results show that the calculated results of the modified equation agree with the experimental values well. The minimum error is 5.4%, and the maximum error is 9.4%. It can predict the critical preload parameters of bearing-bending composite structures well.Thus, the new method is provided for calculating the critical preload parameters of bearing-bending composite structure.

基金项目：

天津市教委科研计划项目（2017KJ101，2017KJ104)

董晓传（1984-），男，博士，讲师 E-mail：dong_xiaochuan@163.com

参考文献：

［1］何文斌, 曾攀, 林峰, 等. 钢丝缠绕重型模锻液压机坎合结构的疲劳与寿命预测
［J］. 机械工程学报, 2015, 51(8): 29-36.

He W B, Zeng P, Lin F, et al. Fatigue life prediction of the bumpy ridge joining of the heavy die forging press with steel wire wound
［J］. Journal of Mechanical Engineering, 2015, 51(8): 29-36.

［2］杨家旺, 黄明辉, 陆新江, 等. 大型模锻压机极低速非线性摩擦建模与验证
［J］. 中南大学学报：自然科学版, 2013, 44(12): 4841-4846.

Yang J W, Huang M H, Lu X J, et al. Nonlinear friction modeling and experimental verification for large die-forging hydraulic press under extremely low speed
［J］. Journal of Central South University：Science and Technology, 2013,44(12): 4841-4846.

［3］Benhaddou T, Stephan P, Daidie A, et al. Effect of axial preload on durability of aerospace fastened joints
［J］. International Journal of Machine Science, 2018, 137: 214-223.

［4］Chval Z, Cechura M. Monitoring extremely stressed points on stands of forging presses
［J］. Procedia Engineering, 2015, 100: 841-846.

［5］董晓传, 金淼, 姚阳, 等. 基于等效梁长法的组合深梁临界预紧力计算模型
［J］. 机械工程学报, 2015, 51(15): 46-52.

Dong X C, Jin M, Yao Y, et al. Calculation model of critical preload of prestressed composite deep beam based on the method of equivalent-beam-length
［J］. Journal of Mechanical Engineering, 2015, 51(15): 46-52.

［6］Awais M, Sorvari J, Tanninen P, et al. Finte element analysis of the press forming process
［J］. International Journal of Mechanical Sciences, 2017, 131: 767-775.

［7］金淼, 董晓传, 邹宗园, 等. 给定预紧力下组合机架的上限载荷的计算
［J］. 中国机械工程, 2012,23(20): 2476-2480.

Jin M, Dong X C, Zou Z Y, et al. Calculation of the upper-bound load for composite frame hydraulic press under the given preload
［J］. China Mechanical Engineering，2012，23(20)：2476-2480.

［8］郭宝峰, 于琳琳, 金淼, 等. 预应力组合下横梁临界预紧力影响因素研究
［J］. 中国机械工程, 2013, 24(19): 2567-2572.

Guo B F, Yu L L, Jin M, et al. Research on influence factors of critical pretension force in pre-stressed assembled lower beam
［J］. China Mechanical Engineering，2013，24(19)：2567-2572.

［9］Lim E, Hwang S J. Modeling of the strut-and-tie parameters of deep beams for shear strength prediction
［J］. Engineering Structures, 2016, 108(1):104-112.

［10］Zhou S, Wang Z Q, Zhou J S, et al. Experimental and numerical investigation on bolted composite joint made by vacuum assisted resin injection
［J］. Composites: Part B, 2013, 45: 1620-1628.

［11］董晓传, 金淼, 张杰, 等. 基于叠加修正法的承弯组合结构临界预紧力研究
［J］. 中南大学学报：自然科学版, 2014, 45(10): 3392-3397.

Dong X C, Jin M, Zhang J, et al. Critical preload of bearing-bending composite structure based on superposition-correction approach
［J］. Journal of Central South University：Science and Technology, 2014, 45(10): 3392-3397.

［12］董晓传. 大型液压机组合部件的临界预紧力研究
［D］．秦皇岛：燕山大学, 2015.

Dong X C. Study on Critical Preload of Prestressed Composite Structures of Large Hydraulic Press
［D］. Qinhuangdao: Yanshan University, 2015.

服务与反馈：

【文章下载】【加入收藏】