|
摘要：
|
|
针对哈克抽芯铆钉铆套成形过程中头部出现的填充不饱满、折叠、飞边等缺陷，在金属流动行为方面分析了缺陷形成的原因。在此基础上初步设计了两种冷精锻成形工艺并优化了模具结构，在工位3模具结构中铆套顶部外圆角处、杆部与头部连接处分别预留一个直径为Ф0.2 mm的排气孔，目的是解决制件填充不满问题，并分别建立有限元模型，利用DEFORM-3D进行数值模拟。对比两种工艺成形过程的等效应力、等效应变、成形载荷和金属流向，仿真结果表明：工艺2成形终段的等效应力、应变值比工艺1分别高出15%和34.6%，且金属流动混乱，从而得出工艺1更加合理的结论。并通过JBF-19B-4S螺栓冷镦机进行试模，得到了无缺陷、填充饱满的制件，实验结果与数值模拟结果保持一致。
|
|
For the defects of incomplete filling, folding and flash in the head of rivet sleeve with Huck core-pulling rivet during the forming process, the causes of defects were analyzed in terms of metal flow behavior. On this basis, two kinds of cold precision forging process were preliminarily designed, and the die structures were optimized. Then, in the die structure of step 3, an exhaust hole with Ф0.2 mm was reserved respectively at the outer corner of the top of rivet sleeve and the joint between rod and head in order to solve the incomplete filling problem of parts. Furthermore, the finite element models were established respectively, and the numerical simulation was carried out by DEFORM-3D. Comparing the effective stress, effective strain, forming load and metal flow direction of the two kinds of forming process, the simulation results show that the effective stress and strain values at the end of the second process are 15% and 34.6% higher than those of the first process respectively, and the metal flow is chaotic. Thus, the first process is more reasonable. Through the JBF-19B-4S bolt cold heading machine, the flawless and full-filled parts are obtained, and the experimental results are consistent with the numerical simulation results.
|
|
基金项目：
|
|
企业横向项目(J2017-184)
|
|
作者简介：
|
|
朱景秋(1994-)，男，硕士研究生，E-mail：1210550874@qq.com；通讯作者：张东民(1968-)，男，博士，教授，E-mail:dmzhang_nuaa@sit.edu.cn
|
|
参考文献：
|
[1]梁强.活塞销冷镦挤成形微折叠缺陷分析及改进措施[J].塑性工程学报,2018,25(6):99-104.
Liang Q. Micro-folding defect analysis and improvement of cold upsetting-extruding process for piston-pin [J].Journal of Plasticity Engineering, 2018,25(6):99-104.
[2]赵德颖,张连东,朱恩领,等.挤压工艺参数对枝杈类锻件折叠缺陷的影响[J].塑性工程学报,2018,25(2):99-105.
Zhao D Y, Zhang L D, Zhu E L, et al. Effects of extrusion processing parameters on folding defects in branch-type forging [J].Journal of Plasticity Engineering, 2018,25(2):99-105.
[3]Chan W L, Fu M W, Lu J. FE simulation-based folding defect prediction and avoidancein forging of axially symmetrical flanged components[J]. Journal of Manufacturing Science and Engineering, 2010,132(5):054502.https://doi.org/10.1115/1.4002188.
[4]Lee Y K, Lee S R, Lee C H, et al. Process modification of bevel gear forging using three-dimensional finite element analysis[J]. Journal of Materials Processing Technology, 2001, 113(1):59-63.
[5]Chan W L, Fu M W, Lu J, et al. Simulation-enabled study of folding defect formation and avoidance in axisymmetrical flanged components[J]. Journal of Materials Processing Technology, 2009, 209(11):5077-5086.
[6]吴先洋.基于响应面法的整体式结合齿齿轮温锻工艺优化[J].锻压技术,2018,43(8):27-34.
Wu X Y. Optimization on warm forging process for monoblock combined tooth gear based on response surface method [J]. Forging & Stamping Technology, 2018, 43(8): 27-34.
[7]汤传尧,樊文欣,尹馨妍.基于Simufact不同旋轮参数下强力反旋连杆衬套成形质量的研究[J].塑性工程学报, 2018, 25(3): 102-107.
Tang C Y, Fan W X, Yin X Y. Forming quality study of power backspinning connecting rod bushing under different rotating wheel parameters based on Simufact [J]. Journal of Plasticity Engineering, 2018, 25 (3): 102-107.
[8]戴龙飞,徐雪峰,孙前江,等. 摩擦系数对薄壁T型管内高压成形的影响[J].锻压技术,2018,43(7):159-164.
Dai L F, Xu X F, Sun Q J, et al. Influence of friction coefficient on internal high pressure forming for thin-walled T-shaped tube [J]. Forging & Stamping Technology, 2018, 43 (7): 159-164.
[9]吴桃.铁路货车专用拉铆钉及套环试制工艺[J].机械研究与应用,2015,28(6):187-188.
Wu T. Trail-production technology of the special pulling rivet and lantern ring for rail wagon [J]. Mechanical Research & Application, 2015, 28 (6): 187-188.
[10]Lange K, Kammerer M, Pohlandt K, 等. 挤压技术: 金属精密件的经济制造工艺[M]. 杜国辉, 赵震, 译. 北京: 机械工业出版社, 2014．
Lange K, Kammerer M, Phlandt K, et al. Extrusion Technology: Economic Manufacturing Process of Metal Precision Parts[M]. Translated by Du G H, Zhao Z. Beijing: China Machine Press, 2014．
[11]Zhang Y, An Z G, Li L. Numerical simulation and process optimization of the die forging for the center wedge of the railway freight car buffers[J]. Advanced Materials Research, 2011, 228-229: 412-415.
[12]Kim D J, Kim B M. Application of neural network and FEM for metal forming processes[J]. International Journal of Machine Tools & Manufacture, 2000, 40(6):911-925.
|
|
服务与反馈：
|
|
【文章下载】【加入收藏】
|
|
|
|
