重载夹持装置承载性能分析与结构胞变设计技术及其应用

发布时间：2018-05-03 01:00

本文选题：重载夹持装置 + 承载性能　；参考：《浙江大学》2015年硕士论文

【摘要】：重载夹持装置承载性能的高低直接影响其操作的可靠性与夹持稳定性。定量分析和明确各工况下重载夹持装置的承载性能及其影响因子,对重载夹持装置的设计与应用具有重要的意义,同时一种新型的高效节能的重载夹持装置对于提高锻造操作机的工作能力具有很大帮助。论文完成的主要工作包括：第一章阐述了操作机的应用及重载夹持装置的主要形式,研究了重载夹持装置承载性能和结构优化设计的现状,分析了其不足之处,并给出了本文研究的主要内容。第二章以压杆式重载夹持装置为研究对象,建立了其承载性能的分析模型。分析计算了夹持装置传动机构的传力比与锻件直径的关系,基于力矩分解法分别建立了夹持装置无偏角及有下偏角两种工况下夹持锻件时钳口在任意角度的夹持效率的计算模型。对影响钳口夹持效率的因素进行了分析,获得了能够提高夹持效率且影响权重较大的结构参数,为探讨动态承载工况下夹持装置承载性能的变化规律和以提高承载性能为目标的夹持装置改进设计提供理论支持。第三章提出了重载夹持装置结构胞变设计技术,以典型压杆式重载夹持装置为设计原型,以提高承载性能为目的,通过对影响其承载性能的结构参数进行多层次胞变操作,实现了重载夹持装置的改进设计,通过对重载夹持装置改进前后承载性能的数值模拟及结果对比分析,证明了重载夹持装置改进设计的可行性。第四章研究了重载夹持装置传动机构的多目标优化方法,根据传动机构的参数确定了设计变量及其约束条件,建立了传动机构的多目标优化模型。采用多目标优化算法求解,将优化结果与数值模拟分析结果进行了对比,验证了优化结果的准确性。第五章通过整机装配体模型的有限元仿真分析,验证了改进后重载夹持装置的结构强度,并对钳臂结构进行了拓扑优化,得到了钳臂较完善、较合理的结构构型,使其材料分布趋于合理。同时对重载夹持装置改进前后在最大载重状态下旋转的过程进行了动力学仿真对比分析,验证了本文所构建的针对夹持装置钳口任意位置夹持效率计算模型的准确性及对重载夹持装置胞变设计的合理性。
[Abstract]:The load-bearing performance of heavy-load clamping device directly affects its operation reliability and clamping stability. It is of great significance for the design and application of heavy load clamping device to quantitatively analyze and make clear the bearing capacity and its influencing factors of heavy load clamping device under various working conditions. At the same time, a new type of high efficiency and energy saving heavy load clamping device is helpful to improve the working ability of forging operator. The main work of this paper is as follows: in the first chapter, the application of the operator and the main forms of the heavy load clamping device are described, and the present situation of the load bearing performance and structural optimization design of the heavy load clamping device is studied, and its shortcomings are analyzed. The main contents of this paper are also given. In the second chapter, an analytical model of the load-bearing capacity of the pressure-bar type heavy-load gripper is established. The relation between the transmission force ratio of the transmission mechanism of the clamping device and the diameter of the forgings is analyzed and calculated. Based on the moment decomposition method, the calculation models of clamping efficiency of forgings at any angle when clamping forgings are set up under two working conditions, that is, no deviation angle of clamping device and one with lower deflection angle, are established respectively. The factors influencing the clamping efficiency are analyzed, and the structural parameters which can improve the clamping efficiency and influence the weight are obtained. It provides theoretical support for the study of the variation of the load bearing performance of the clamping device under the dynamic load loading condition and the improvement design of the clamping device aimed at improving the load bearing performance. In the third chapter, the cellular design technology of heavy load clamping device is proposed. The typical heavy load clamping device is used as the prototype, and the structural parameters that affect its bearing performance are operated by multilayer cellular transformation operation, which is aimed at improving the bearing capacity of the device. The improved design of heavy load clamping device is realized. The feasibility of improving the design of heavy load clamping device is proved by the numerical simulation of the load bearing performance before and after the improvement and the comparative analysis of the results. In chapter 4, the multi-objective optimization method of the transmission mechanism of heavy load clamping device is studied. According to the parameters of the transmission mechanism, the design variables and their constraints are determined, and the multi-objective optimization model of the transmission mechanism is established. The optimization results are compared with the numerical simulation results by using multi-objective optimization algorithm to verify the accuracy of the optimization results. The fifth chapter verifies the structural strength of the improved heavy-duty clamping device through the finite element simulation analysis of the assembly body model of the whole machine, and optimizes the structure of the clamp arm, and obtains the more perfect and reasonable structure configuration of the clamp arm. The distribution of the material tends to be reasonable. At the same time, the dynamic simulation analysis of the rotating process of the heavy load clamping device under the maximum load state before and after the improvement is carried out. The accuracy of the computational model for the clamping efficiency at any position of the clamp mouth and the rationality of the cellular design of the heavy load clamping device are verified in this paper.
【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】：TG75

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