模具用弓形架结构拓扑优化及疲劳分析
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摘要
为了克服现有非标模具夹紧机构的缺陷和不足,采用变密度法对其承载基体弓形架进行结构拓扑优化。通过分析比较3种制造约束方案的拓扑优化结果,发现采用"对称和拔模约束"时,弓形架拓扑结构具有较好的形貌特征和可制造性,而且其质量较之前减轻了约55.5%,在提高材料利用率的同时,实现了夹紧机构的轻量化。有限元静力学分析结果表明,经拓扑优化的弓形架符合结构强度和刚度设计要求。通过疲劳和损伤分析可知,该夹紧机构具有2年以上的安全使用寿命,而且在实际使用过程中损伤较小,有利于延长使用寿命、节省成本。
In order to overcome faultiness and shortcomings of the existing clamping mechanism on non-standard mould,as a basis of load bearing on the mechanism,the arch frame structure was topological optimization designed with variable density method.Through analyzing and comparing the results of topology optimization from three manufacturing constraints,the adopted time of the"symmetrical and draft constraints"was finally found,and the arch frame had better morphological characteristics and manufacturability.moreover,its quality was reduced by about 55.5%compared with the original structure.the lightweight design of the mechanism was realized while improving material utilization ratio.The results of finite element static analysis showed that the arch frame optimized by topology was accorded with requirements of structural strength and stiffness design.In conclusion,the clamping mechanism could service two more years,and the damage of it was also less in the actual use process.
In order to overcome faultiness and shortcomings of the existing clamping mechanism on non-standard mould,as a basis of load bearing on the mechanism,the arch frame structure was topological optimization designed with variable density method.Through analyzing and comparing the results of topology optimization from three manufacturing constraints,the adopted time of the"symmetrical and draft constraints"was finally found,and the arch frame had better morphological characteristics and manufacturability.moreover,its quality was reduced by about 55.5%compared with the original structure.the lightweight design of the mechanism was realized while improving material utilization ratio.The results of finite element static analysis showed that the arch frame optimized by topology was accorded with requirements of structural strength and stiffness design.In conclusion,the clamping mechanism could service two more years,and the damage of it was also less in the actual use process.
引文
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[2]潘志达.模块化设计和预制装配式技术的应用研究[J].建筑技术开发,2017,44(20):19-20.
[3]赵灵.食品罐内盖注塑模具设计[J].制造技术与机床,2016(1):138-140.
[4]王平,张国玉,刘家燕,等.机载光电平台内框架拓扑优化设计[J].机械工程学报,2014,50(13):135-141.
[5]寇鑫,葛文杰.基于多点驱动式柔性机构的变形翼后缘拓扑优化[J].机械强度,2018,40(4):983-986.
[6]林瑞,匡兵,周峰,等.基于变密度法的发动机支架性能优化[J].组合机床与自动化加工技术,2018(11):123-126.
[7]张宪民,胡凯,王念峰,等.基于并行策略的多材料柔顺机构多目标拓扑优化[J].机械工程学报,2016,52(19):1-8.
[8]赵海鸣,蒋彬彬,李密.基于拓扑优化与多目标优化的机床底座结构设计[J].机械设计与研究,2018,34(4):100-105.
[9]杨福芹,蒋典兵.三叉杆滑块式万向联轴器的疲劳寿命分析[J].机械强度,2018,40(6):1 501-1 505.
[10]聂文武,肖雨,毛洪海,等.某重型商用车传动轴强度与疲劳寿命分析[J].机械设计,2018,35(1):166-168.
[11]李静,张显余,张乐迪.基于ANSYS Workbench某型起落架疲劳寿命分析[J].兵器装备工程学报,2017,38(10):171-174,180.
[12]郑战光,蔡敢为,李兆军,等.基于损伤力学阐释MansonCoffin低周疲劳模型[J].中国机械工程,2011,22(7):812-814.