基于虚拟样机技术的杠杆式精密剪切装置的设计

发布时间：2018-05-16 09:26

本文选题：剪切机构 + 虚拟样机　；参考：《兰州理工大学》2017年硕士论文

【摘要】：剪切机作为生产部门用处最广的一种断料设备,多年来一直受到研究人员的高度重视,而传统设计方式已经不能满足现代社会的发展速度,本文利用CAD/CAE技术,结合虚拟样机技术,以φ20mm的棒料Q235A为例,利用径向夹紧剪切方式,设计了一种杆杆式精密剪切装置,建立了该装置的虚拟模型。通过数值分析,对若干关键零件进行了设计与优化。本文的主要工作成果有以下几点:1)总结了已有的剪切机的工作特点,分析了他们各自的优势与缺点。论述了虚拟样机技术的产生背景,目前的发展现状,以及大数据的时代下,未来虚拟样机技术的发展趋势;2)论述了棒料剪切的几何关系,对比了几种棒料精密剪切方式的原理,分析得出径向夹紧剪切方式的断面质量较好。分析了棒料剪切的受力过程与应力状态。对影响断面质量的几个主要因素进行了研究;3)运用径向夹紧原理与杠杆技术相结合,设计了一种杠杆式精密剪切装置,详细论述了径向夹紧的工作原理,给出了杠杆式精密剪切装置的总体装配图,并完成了关键零部件的设计,包括杠杆结构、剪刃结构、回位装置、间隙调节装置、定位与卸料装置等。并简述了杠杆式剪切装置的工作流程;4)参照所设计的关键零部件,利用UG NX软件完成了零部件的几何建模,然后对其进行虚拟装配,给出了装置的爆炸图,并对机构干涉检查;5)对初步设计的剪切装置进行运动特性分析,分析了机构运动部件的运动参数位移、速度、加速度,预估了机构的剪切效率,验证了剪切机构在工作过程中的合理性;6)对机构的动态特性做了分析,分析了机构的模态、剪切过程中关键零部件的刚度与强度以及疲劳寿命,校核了机构的强度与刚度。结果表明:设计的杠杆式棒料剪切装置能够实现预定的工作目标,主要部件的强度、刚度等符合工作要求。和现有装置相比,该装置具有工作稳定性好,工作效率高等特点。同时在产品设计过程中,虚拟样机技术的贡献,从设计到仿真,方便设计人员发现错误,改正错误,为产品的实际制造提供数据参考。
[Abstract]:As one of the most useful cutting equipment in the production department, shearing machine has been highly valued by researchers for many years, but the traditional design method can not meet the speed of development of modern society. This paper uses CAD/CAE technology, Combined with virtual prototyping technology, taking the rod Q235A of 蠁 20mm as an example, a rod type precision shearing device is designed by means of radial clamping and shearing, and the virtual model of the device is established. Through numerical analysis, some key parts are designed and optimized. The main achievements of this paper are as follows: 1) the characteristics of existing shears are summarized and their respective advantages and disadvantages are analyzed. This paper discusses the background of virtual prototyping technology, the present situation of development, and the development trend of virtual prototyping technology in the future under the era of big data) discusses the geometric relationship of bar shearing, and compares the principles of several kinds of precision shearing methods of bar materials. The analysis shows that the cross section quality of radial clamping shear mode is better. The stress process and stress state of bar shearing are analyzed. In this paper, several main factors affecting the quality of the cross section are studied. By combining the radial clamping principle with the lever technique, a kind of lever precision shearing device is designed, and the working principle of radial clamping is discussed in detail. The overall assembly diagram of the lever precision shear device is given, and the design of the key parts is completed, including the lever structure, the cutting edge structure, the return device, the clearance adjusting device, the positioning and unloading device, and so on. According to the key parts designed, the geometric modeling of the parts is completed by UG NX software, and then the virtual assembly is carried out, and the explosion diagram of the device is given. The kinematic characteristics of the preliminary designed shearing device are analyzed, the displacement, velocity and acceleration of the moving components of the mechanism are analyzed, and the shear efficiency of the mechanism is estimated. The rationality of the shear mechanism in the working process is verified. The dynamic characteristics of the mechanism are analyzed, the modes of the mechanism, the stiffness and strength of the key parts in the shear process and the fatigue life are analyzed, and the strength and stiffness of the mechanism are checked. The results show that the designed lever bar shearing device can achieve the predetermined working objectives, and the strength and stiffness of the main components can meet the requirements of the work. Compared with the existing device, the device has the characteristics of good working stability and high working efficiency. At the same time, in the process of product design, the contribution of virtual prototyping technology, from design to simulation, is convenient for designers to find errors, correct errors, and provide data reference for the actual manufacture of products.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG333.21

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