6300KN多向液态模锻液压机机架热—结构耦合分析及其立柱的疲劳寿命研究

发布时间：2018-01-26 20:38

本文关键词： 液态模锻机机架 ANSYS Workbench 温度场热-结构耦合变形　出处：《浙江工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：液态模锻是一种能够有效避免铸件气孔、缩孔、疏松等缺陷的优质、高效、节能、适应性广的现代制造工艺。由于其各方面的优越性,液态模锻工艺已在工业生产中得到广泛应用。液态模锻液压机是实现液态模锻工艺的基础设备,其刚度强度性能直接影响到整机的安全和产品的质量及生产效率,以往对液态模锻液压机机架的设计和研究常是在单独考虑力载荷的情况下进行的,但在实际工作过程中,具有温度的模具不可避免地对机架产生一定的热影响,使机架产生热应力和热变形。本文以6300KN多向液态模锻液压机为研究对象,采用Solidworks和ANSYS Workbench软件,对极限热源、满载工况下的液态模锻液压机机架进行了热-结构耦合分析,得到了机架的温度场和应力变形场分布情况,对机架进行了刚度强度校核,并与机架的结构静力分析结果进行对比分析,发现在同时考虑热载荷和力载荷的情况下,液压机机架不能满足刚度要求,说明在设计和研究液态模锻机机架时考虑热影响的必要性。本文对影响机架应力变形的热因素和结构因素进行了研究,发现隔热板厚度和活动横梁结构对机架最大变形值的影响比较显著,在此基础上,提出合理的改进方案,使机架满足刚度强度要求,并对影响活动横梁导向正确性的立柱-动梁导套间的侧隙在不同偏心距下进行了研究,为活动横梁立柱孔的设计和活动横梁的安装提供了一定指导。液态模锻液压机经常承受多次反复加载及卸载,后者会引起剧烈的振动与晃动,立柱容易发生高周疲劳,故本文在对改进后机架进行热-结构耦合分析的基础上,对立柱进行了疲劳寿命分析,得到立柱在考虑力载荷和热载荷时满足疲劳寿命和疲劳强度要求,并为立柱的实际使用寿命提供预测。
[Abstract]:Liquid die forging is a kind of modern manufacturing technology which can effectively avoid defects such as porosity, shrinkage, porosity and so on. It is of high quality, high efficiency, energy saving and wide adaptability. Liquid die forging technology has been widely used in industrial production. Liquid die forging hydraulic press is the basic equipment to realize liquid die forging process. Its stiffness and strength performance directly affect the safety of the whole machine and the product quality and production efficiency. In the past, the design and research of the liquid die forging hydraulic press frame was carried out under the condition of considering the force load alone. However, in the actual working process, the mold with temperature will inevitably have a certain thermal impact on the frame. The thermal stress and deformation of the frame are produced. This paper takes 6300KN multi-direction liquid die forging hydraulic press as the research object, and adopts Solidworks and ANSYS Workbench software. The thermo-structural coupling analysis of the liquid die forging hydraulic press frame under the limit heat source and full load condition is carried out, the distribution of temperature field and stress and deformation field of the frame is obtained, and the stiffness strength of the frame is checked. Compared with the static analysis results of the frame, it is found that the hydraulic press frame can not meet the requirements of stiffness when the thermal load and the force load are considered at the same time. It is necessary to consider the thermal effect in the design and study of the liquid die forging machine frame. The thermal and structural factors affecting the stress and deformation of the frame are studied in this paper. It is found that the thickness of the insulation plate and the structure of the moving beam have a significant effect on the maximum deformation value of the frame. On this basis, a reasonable improvement scheme is put forward to make the frame meet the requirements of stiffness and strength. The clearance between column and guide sleeve of moving beam is studied under different eccentricity. The liquid die forging hydraulic press is often subjected to repeated loading and unloading, the latter will cause violent vibration and sloshing. The column is prone to high cycle fatigue, so the fatigue life of the column is analyzed on the basis of the thermal-structural coupling analysis of the improved frame. The results show that the column meets the requirements of fatigue life and fatigue strength when considering the force load and thermal load, and provides a prediction for the actual service life of the column.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG315.4

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