冲压液压机冲裁缓冲设计与性能优化仿真技术及其应用研究
发布时间：2018-12-14 22:17
【摘要】：高品质、优性能的冲压液压机成为当下的发展趋势,本文针对冲压液压机板料冲裁瞬态失载引起强烈振动、结构优化未考虑弯曲性开缝、冲压过程性能缺乏综合仿真验证等问题,提出了冲压液压机冲裁缓冲设计与性能优化仿真技术,并结合实际项目将其运用到冲压液压机的研发当中。本文的主要研究内容如下：第一章概述了冲压液压机的发展趋势和技术需求,综述了液压机冲裁减振、产品结构优化和性能仿真技术的研究现状,分析了现有研究存在的问题和不足,提出了冲压液压机冲裁缓冲设计与性能优化仿真技术,给出了论文的组织结构和总体框架。第二章提出了面向瞬态失载的冲压液压机主机自适应冲裁缓冲设计方法。在板料冲裁最大冲裁力之前对缓冲缸进行预压缩,当缓冲缸作用力上升到与冲裁力之和达到设定值后,保持工作缸作用力在设定值不变进行冲裁,实现了缓冲力自动适应板料冲裁力的变化。为了指导缓冲点位置等参数的设置,研究了板厚、间隙等参数对最大冲裁力及其位置的影响,通过拉丁超立方试验设计,得到了基于响应面模型的最大冲裁力及其位置的近似函数,最后简单讨论了该缓冲方法的实现途径。第三章提出了面向弯曲开缝的冲压液压机全预紧机架结构参数优化方法。通过对机架的受载变形分析及结构几何特性计算,得到了临界载荷、质量与关键设计尺寸之间的参数化模型,并构建了机架一阶固有频率的Kriging近似模型。在尺寸设计空间内,运用改进的细菌觅食算法对以临界载荷最大、质量最小为目标,一阶固有频率为约束的优化模型进行求解。以20MN薄板冲压液压机机架结构参数优化为例,验证了方法的可行性。第四章提出了面向冲压过程的冲压液压机本体动静态特性仿真分析方法。在对冲压过程分析的基础上,构建了关键部件受载变形、上梁立柱接触状态、油缸疲劳破坏和机架振动的相关数学模型,从运动学、静力学、动力学的角度进行了压机本体动静态特性综合仿真分析。以20MN薄板冲压液压机为例,给出了机架刚度强度、上梁立柱接触应力、工作主缸疲劳寿命、机架6阶模态的仿真分析结果。第五章结合企业项目,开发了合肥合锻冲压液压机产品信息管理与优化仿真系统,并在企业中得到实际应用,验证了本文所述方法的有效性和实用性。第六章总结了论文的研究成果和工作,并对今后的研究方向进行了展望。
[Abstract]:High quality and excellent performance stamping hydraulic press has become the current trend of development. In this paper, the dynamic vibration of sheet metal blanking caused by transient loss of load, structure optimization does not take into account the bending slit. The stamping process performance is short of comprehensive simulation verification and so on. This paper puts forward the stamping buffer design and performance optimization simulation technology of stamping hydraulic press, and applies it to the research and development of stamping hydraulic press combined with the actual project. The main contents of this paper are as follows: in the first chapter, the development trend and technical requirements of stamping hydraulic press are summarized, and the research status of press blanking vibration reduction, product structure optimization and performance simulation technology is summarized. The problems and shortcomings of the existing research are analyzed, and the technology of stamping buffer design and performance optimization simulation is put forward, and the organization structure and overall framework of the paper are given. In the second chapter, an adaptive blanking buffer design method for the hydraulic press is proposed. The buffer cylinder is precompressed before the maximum blanking force of sheet metal is blanked. When the action force of the buffer cylinder rises to the set value of the sum of the force and the blanking force, the working cylinder force is kept unchanged in the set value for punching. The buffering force can automatically adapt to the change of blanking force. In order to guide the setting of buffer position and other parameters, the effects of plate thickness and clearance on the maximum blanking force and its position are studied. The Latin hypercube experimental design is used to study the influence of plate thickness and clearance on the maximum blanking force and its position. The approximate function of the maximum blanking force and its position based on the response surface model is obtained. Finally, the implementation of the buffer method is briefly discussed. In chapter 3, the optimization method of the structural parameters of the full preload frame of hydraulic press for bending slit is proposed. The parameterized model between critical load, mass and key design size is obtained by analyzing the deformation of the frame under load and calculating the geometric characteristics of the structure, and the Kriging approximation model of the first order natural frequency of the frame is constructed. The improved bacterial foraging algorithm is used to solve the optimization model with maximum critical load, minimum mass and first order natural frequency constraint in the dimension design space. The feasibility of the method is verified by the optimization of the structural parameters of the 20MN sheet stamping hydraulic press frame. In chapter 4, the dynamic and static characteristics simulation method for stamping hydraulic press is presented. Based on the analysis of the stamping process, the mathematical models of the deformation of the key components under load, the contact state of the upper beam column, the fatigue failure of the cylinder and the vibration of the frame are constructed, including kinematics, statics, etc. The dynamic and static characteristics of the press body are simulated and analyzed from the point of view of dynamics. Taking 20MN sheet stamping hydraulic press as an example, the results of simulation analysis of frame stiffness strength, contact stress of upper beam column, fatigue life of main cylinder and sixth order mode of frame are given. In the fifth chapter, the information management and optimization simulation system of Hefei hydraulic press is developed, which is applied in the enterprise, and the validity and practicability of the method are verified. The sixth chapter summarizes the research results and work, and prospects for future research.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG385.1
本文编号：2379413
[Abstract]:High quality and excellent performance stamping hydraulic press has become the current trend of development. In this paper, the dynamic vibration of sheet metal blanking caused by transient loss of load, structure optimization does not take into account the bending slit. The stamping process performance is short of comprehensive simulation verification and so on. This paper puts forward the stamping buffer design and performance optimization simulation technology of stamping hydraulic press, and applies it to the research and development of stamping hydraulic press combined with the actual project. The main contents of this paper are as follows: in the first chapter, the development trend and technical requirements of stamping hydraulic press are summarized, and the research status of press blanking vibration reduction, product structure optimization and performance simulation technology is summarized. The problems and shortcomings of the existing research are analyzed, and the technology of stamping buffer design and performance optimization simulation is put forward, and the organization structure and overall framework of the paper are given. In the second chapter, an adaptive blanking buffer design method for the hydraulic press is proposed. The buffer cylinder is precompressed before the maximum blanking force of sheet metal is blanked. When the action force of the buffer cylinder rises to the set value of the sum of the force and the blanking force, the working cylinder force is kept unchanged in the set value for punching. The buffering force can automatically adapt to the change of blanking force. In order to guide the setting of buffer position and other parameters, the effects of plate thickness and clearance on the maximum blanking force and its position are studied. The Latin hypercube experimental design is used to study the influence of plate thickness and clearance on the maximum blanking force and its position. The approximate function of the maximum blanking force and its position based on the response surface model is obtained. Finally, the implementation of the buffer method is briefly discussed. In chapter 3, the optimization method of the structural parameters of the full preload frame of hydraulic press for bending slit is proposed. The parameterized model between critical load, mass and key design size is obtained by analyzing the deformation of the frame under load and calculating the geometric characteristics of the structure, and the Kriging approximation model of the first order natural frequency of the frame is constructed. The improved bacterial foraging algorithm is used to solve the optimization model with maximum critical load, minimum mass and first order natural frequency constraint in the dimension design space. The feasibility of the method is verified by the optimization of the structural parameters of the 20MN sheet stamping hydraulic press frame. In chapter 4, the dynamic and static characteristics simulation method for stamping hydraulic press is presented. Based on the analysis of the stamping process, the mathematical models of the deformation of the key components under load, the contact state of the upper beam column, the fatigue failure of the cylinder and the vibration of the frame are constructed, including kinematics, statics, etc. The dynamic and static characteristics of the press body are simulated and analyzed from the point of view of dynamics. Taking 20MN sheet stamping hydraulic press as an example, the results of simulation analysis of frame stiffness strength, contact stress of upper beam column, fatigue life of main cylinder and sixth order mode of frame are given. In the fifth chapter, the information management and optimization simulation system of Hefei hydraulic press is developed, which is applied in the enterprise, and the validity and practicability of the method are verified. The sixth chapter summarizes the research results and work, and prospects for future research.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG385.1
【参考文献】
相关硕士学位论文 前1条
1 庞逢祥;22MN快锻液压机机液系统联合仿真及试验研究[D];燕山大学;2011年
，本文编号：2379413
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