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弹性成形液压机机身结构分析与优化设计

发布时间:2018-01-26 05:51

  本文关键词: 板框式液压机 静力分析 模态分析 响应曲面 结构尺寸优化 出处:《合肥工业大学》2017年硕士论文 论文类型:学位论文


【摘要】:弹性成形压机(又称橡皮垫成形压机)多应用于航天、航空、医疗等多品种小批量试件的制造领域,它具有低模具成本、生产灵活性强等突出优点。大吨位的弹性成形压机的机身一般采用框架结构,由多片热轧厚钢板组成,没有焊接或机械接头,机身的安全性和紧凑性好。为探索非预应力的整体板框机架式液压机的结构特点和机械性能,本课题以10MN弹性成形压机为研究对象。根据液压机的基本设计原理和主要技术参数,设计液压机的三维结构,由于机身板框安装方式的不同,可拟定两种结构形式。运用ANSYS Workbench建立液压机的有限元分析模型,在中心载荷工况和偏心载荷工况下,分别对液压机的两种结构模型进行静力分析,得出它们的应力和应变分布云图。对比静力分析,工况Ⅳ为液压机工作时最恶劣的情况,此时模型一的最大形变量和最大应力均小于模型二的最大应力;而在中心载荷情况下,两者恰好相反。对液压机的两种结构模型进行模态分析,得出它们的前六阶固有频率和对应的振型。对比模态分析,模型一和模型二的模态振型基本类似,但各阶固有频率和振幅相差明显。建立液压机的有阻尼三自由度力学模型,结合能量法对弹性成形液压机进行振动分析。采用响应曲面优化分析的方法,以液压机机身质量最小和第一阶固有频率最大为第一种情况下的设计目标,以机身质量最小为第二种情况下的设计目标,分别对两种结构模型进行尺寸优化。并结合优化所得的2D曲线,分析设计变量对各状态变量的影响规律。
[Abstract]:Elastic forming press (also called rubber pad forming press) is widely used in many fields such as aerospace, aviation, medical treatment and so on. It has low die cost. The frame structure of the large tonnage elastic forming press is generally adopted, which is composed of several hot rolled thick steel plates without welding or mechanical joints. The safety and compactness of the fuselage are good. In order to explore the structural characteristics and mechanical properties of the unprestressed integral plate and frame machine frame hydraulic press. According to the basic design principle and main technical parameters of the hydraulic press, the three-dimensional structure of the hydraulic press is designed, because of the different installation mode of the frame and plate of the fuselage. The finite element analysis model of hydraulic press can be established by using ANSYS Workbench, under the condition of center load and eccentric load. By static analysis of two kinds of structural models of hydraulic press, the distribution of stress and strain is obtained. Compared with static analysis, working condition 鈪,

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