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以前坐椅左右侧板为例,综合阐述了覆盖件成形工艺补充面设计原则及应力变化;并用Autoform4.0软件模拟了前坐椅左右侧板拉延成形过程,得到该制件拉延成形的工艺参数;设计出该件的拉延工序模具。 相似文献
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分析了大型覆盖件拉延成形的润滑特性,比较了各种润滑剂的润滑性能,探讨了润滑剂的选择,指出了润滑设计应考虑润滑剂、摩擦因数与压边力的关系以及模具表面处理与润滑状态等问题,对大型覆盖件拉延成形具有指导作用。 相似文献
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汽车覆盖件冲压回弹仿真的研究 总被引:1,自引:0,他引:1
为了解决汽车覆盖件冲压成形过程中的回弹问题,以板料冲压成形有限元理论和仿真方法为基础,对某汽车U形梁采用板料成形仿真软件Dynaform,在计算机上模拟冲压成形及回弹的过程,预测出实际的模具制造过程中可能出现的回弹量,通过将仿真结果与实验对比,说明了仿真设计方法的实用性,从而总结出控制回弹的措施. 相似文献
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汽车覆盖件冲压成形仿真研究进展 总被引:2,自引:0,他引:2
汽车覆盖件冲压成形仿真技术的发展,突破了原有汽车冲压件模具及工艺设计的设计方法,对保证工件质量、减少材料消耗、缩短产品开发周期、降低制造成本具有重要意义.概述了目前汽车覆盖件冲压成形仿真所涉及到的热点领域,如摩擦与接触、回弹分析、模具系统和工艺参数、材料屈服模型和板料形状设计,讨论了这些领域的研究进展和进一步研究的发展方向. 相似文献
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分析了螺旋叶片的冲压成形工艺,针对其受力和成形的复杂性,对模具采用镶块式凹模结构,以及内导柱和定位柱等结构设计.试验表明,镶块结构的冲压模在减少叶片的回弹有明显的作用. 相似文献
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Recep Gümrük 《International Journal of Mechanical Sciences》2009,51(5):350-362
In this paper the influences of residual effects of a deep drawing forming process on the axial quasi-static crash behaviour of straight thin-walled top-hat section were numerically investigated. The residual forming data on the plastic strains, residual stresses and thickness variations were transferred to crash models, which include both deformed and nominal meshes. The influence of spring-back or spring-in on crash performance of the member was also considered. Numerical simulations were carried out by using the nonlinear finite element code LS-DYNA. As a result of these analyses it appears that the residual forming data and the effects of spring-back significantly influence the crash response and they should be considered in computational impact simulations. 相似文献
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针对受力和成形的复杂性,建立了螺旋叶片的受力模型,对其进行力学分析,从而得出结论:冲压模具应采用镶块式凹模结构.试验表明,镶块结构的冲压模在减少叶片的回弹方面有明显的作用. 相似文献
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《Measurement》2016
This paper attempts to model and predict the spring-back for creep age forming of a 7075 Al-Alclad alloy using statistical analyses based on a design of experiments method. Time and temperature were chosen as effective variables for determining spring-back in the creep age-forming process. The D-optimal design of experiments method facilitated statistical analyses and the extraction of a mathematical model for determining spring-back in the experimental variables domain. The spring-back of the specimens was calculated using a numerical procedure based on the pure bending theory. Analysis of the variances for spring-back showed that temperature was the most effective variable in the creep-age forming process. Additionally, a mathematical model and the response surface of the spring-back showed that to decrease spring-back, the significant variables should be in the upper level. The spring-back in the creep age-forming process was optimized for a 7075 Al-Alclad alloy in the optimum mechanical properties region. 相似文献
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加载路径对弯曲件回弹影响的机理 总被引:1,自引:0,他引:1
通过对弯曲件加栽和卸载路径及横截面切向应力分布图进行分析,通过作图法定性地分析了弯曲回弹产生和控制的机理。论述了加载和卸载路径对弯曲回弹的影响机理。详细分析了拉弯中预拉力法和补拉力法申加载和卸载的路径及对弯曲件回弹的影响,指出了它们对控制回弹作用的不同,预拉力主要用于防止弯曲起皱,补拉力的作用是减小弯曲件的回弹。对工艺人员采用不同的方法控制回弹具有指导意义。 相似文献
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Spring-back characteristics of fiber metal laminate (GLARE) in brake forming process 总被引:3,自引:3,他引:0
Se Young Kim Won Jong Choi Sang Yoon Park 《The International Journal of Advanced Manufacturing Technology》2007,32(5-6):445-451
The brake forming process has been considered as a feasible method for producing fiber metal laminate (GLARE) stringer. However,
the spring-back developed during brake forming leads to serious problems in the final dimensional tolerance of the stringer.
A series of experiments were performed to examine the effect of tool design and process parameters on the spring-back of GLARE.
The parameters studied include punch radius, punch speed, forming load, and forming temperature. This paper shows that both
design and process parameters can significantly affect the amount of spring-back. Scanning electron microscopy (SEM) was also
carried out for the observation of delamination or cracking in the bent zone. 相似文献
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首先阐述了弯曲成形回弹模拟的方法及其一步逆成形法的基本原理.通过采用一步逆成形法来获得弯曲成形后的应力分布,然后利用LS-DYNA隐式求解器对卸载回弹过程进行了模拟.最后将该方法分别应用到无约束圆柱弯曲成形和卡车纵梁弯曲成形的回弹模拟中,并将模拟结果与实验结果进行了比较,比较的结果表明,该方法可以有效地预示出弯曲成形的回弹量. 相似文献