冲裁力理论分析与实验研究

发布时间：2018-03-19 14:01

本文选题：冲裁　切入点：冲裁力　出处：《济南大学》2017年硕士论文　论文类型：学位论文

【摘要】：冲裁是指利用安装在压力机机身上的模具使得板料沿一定的冲裁轮廓线产生相互分离的工序,一般包含冲孔和落料。由于冲裁工艺方便、高效,在实际生产中,得到了广泛的应用。冲裁力是用来选取设备型号,设计模具以及校核冲头强度的重要依据。随着冲压技术的快速发展,各种冲裁工艺(如厚板冲裁、高强度钢板冲裁)对冲裁力的精准确定,冲裁力的发展过程提出了更高的要求。所以,冲裁力的研究对于扩展冲裁基础理论具有一定的理论价值,对于高强板冲压、厚板冲裁等工艺具有工程应用意义。本文以冲裁工艺为研究对象,开展了冲裁力理论分析、实验研究以及数值模拟。主要研究内容及结果如下:(1)以冲裁工艺为研究对象,开展了冲裁力的理论分析,建立了较为精确的冲裁力理论计算公式,为丰富冲裁理论提供了支撑。通过运用滑移线场理论,分析板料的受力状态,建立力学分析模型,推导获得了最大冲裁力理论计算公式;通过运用上限法,建立力学分析模型,推导获得了冲裁过程作用力的理论计算公式,分析了冲裁力随冲头行程的变化规律,获得了板料厚度、冲裁间隙等工艺参数对冲裁力的影响规律。(2)在室温条件下,开展了冲裁力的实验研究,设计了实验方案和实验装置,验证了理论公式的准确性,阐明了冲裁力的影响因素及规律。通过分析实验获得的冲裁力行程曲线以及最大冲裁力,总结了不同工艺参数如板料厚度、冲裁间隙以及冲裁速度对冲裁力的影响规律;通过对比实验与理论计算的结果,验证了推导出的冲裁力理论计算公式的正确性。(3)运用有限元分析软件ANSYS/LS-DYNA,开展了冲裁过程的数值模拟。建立冲裁过程有限元分析模型,获得了冲裁力的仿真曲线以及最大冲裁力。综合分析了数值模拟、实验研究以及理论计算的冲裁力结果。综上所述,本文基于滑移线法与上限法获得了冲裁力理论计算公式,通过开展冲裁力实验研究,验证了理论公式的准确性;通过理论分析、实验研究和数值模拟,阐明了冲裁间隙、板料厚度等工艺参数对冲裁力的影响规律。
[Abstract]:Blanking refers to the use of the die installed on the body of the press to make the sheet metal separate from each other along a certain blanking profile, generally including punching and blanking. Due to the convenience and efficiency of the blanking process, the blanking process is used in actual production. Blanking force is an important basis for selecting equipment type, designing die and checking punch strength. With the rapid development of stamping technology, various blanking processes (such as thick plate blanking, etc.). Therefore, the research of blanking force has certain theoretical value for expanding the basic theory of blanking, and is of certain theoretical value for high strength sheet stamping. The blanking technology of thick plate has engineering application significance. In this paper, the theoretical analysis, experimental study and numerical simulation of blanking force are carried out. The main research contents and results are as follows: (1) the blanking process is taken as the research object. The theoretical analysis of blanking force is carried out, and a more accurate formula for calculating punching force is established, which provides the support for enriching blanking theory. By using the theory of slip line field, the mechanical analysis model is established by analyzing the stress state of sheet metal. The theoretical formula for calculating the maximum blanking force is derived, the mechanical analysis model is established by using the upper bound method, the theoretical calculation formula of the force in the blanking process is derived, and the variation law of the blanking force with the stroke of the punching head is analyzed. The experimental research of blanking force was carried out at room temperature. The experimental scheme and experimental device were designed to verify the accuracy of the theoretical formula. By analyzing the stroke curve of blanking force and the maximum blanking force obtained by experiments, the influence laws of different technological parameters such as sheet thickness, blanking clearance and blanking speed are summarized. By comparing the results of experiment and theoretical calculation, the correctness of the theoretical formula of blanking force is verified. The numerical simulation of blanking process is carried out by using the finite element analysis software ANSYS / LS-DYNA.The finite element analysis model of blanking process is established. The simulation curve of blanking force and the maximum blanking force are obtained. The results of numerical simulation, experimental study and theoretical calculation of blanking force are synthetically analyzed. In summary, based on the slip line method and upper bound method, the theoretical calculation formula of blanking force is obtained. The accuracy of the theoretical formula is verified by the experimental study of blanking force, and the influence of blanking clearance and sheet thickness on the blanking force is clarified by theoretical analysis, experimental study and numerical simulation.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG386.2

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