本文選題：剪切機構 + 虛擬樣機　； 參考：《蘭州理工大學》2017年碩士論文

【摘要】：剪切機作為生產部門用處最廣的一種斷料設備,多年來一直受到研究人員的高度重視,而傳統(tǒng)設計方式已經不能滿足現(xiàn)代社會的發(fā)展速度,本文利用CAD/CAE技術,結合虛擬樣機技術,以φ20mm的棒料Q235A為例,利用徑向夾緊剪切方式,設計了一種桿桿式精密剪切裝置,建立了該裝置的虛擬模型。通過數(shù)值分析,對若干關鍵零件進行了設計與優(yōu)化。本文的主要工作成果有以下幾點:1)總結了已有的剪切機的工作特點,分析了他們各自的優(yōu)勢與缺點。論述了虛擬樣機技術的產生背景,目前的發(fā)展現(xiàn)狀,以及大數(shù)據(jù)的時代下,未來虛擬樣機技術的發(fā)展趨勢;2)論述了棒料剪切的幾何關系,對比了幾種棒料精密剪切方式的原理,分析得出徑向夾緊剪切方式的斷面質量較好。分析了棒料剪切的受力過程與應力狀態(tài)。對影響斷面質量的幾個主要因素進行了研究;3)運用徑向夾緊原理與杠桿技術相結合,設計了一種杠桿式精密剪切裝置,詳細論述了徑向夾緊的工作原理,給出了杠桿式精密剪切裝置的總體裝配圖,并完成了關鍵零部件的設計,包括杠桿結構、剪刃結構、回位裝置、間隙調節(jié)裝置、定位與卸料裝置等。并簡述了杠桿式剪切裝置的工作流程;4)參照所設計的關鍵零部件,利用UG NX軟件完成了零部件的幾何建模,然后對其進行虛擬裝配,給出了裝置的爆炸圖,并對機構干涉檢查;5)對初步設計的剪切裝置進行運動特性分析,分析了機構運動部件的運動參數(shù)位移、速度、加速度,預估了機構的剪切效率,驗證了剪切機構在工作過程中的合理性;6)對機構的動態(tài)特性做了分析,分析了機構的模態(tài)、剪切過程中關鍵零部件的剛度與強度以及疲勞壽命,校核了機構的強度與剛度。結果表明:設計的杠桿式棒料剪切裝置能夠實現(xiàn)預定的工作目標,主要部件的強度、剛度等符合工作要求。和現(xiàn)有裝置相比,該裝置具有工作穩(wěn)定性好,工作效率高等特點。同時在產品設計過程中,虛擬樣機技術的貢獻,從設計到仿真,方便設計人員發(fā)現(xiàn)錯誤,改正錯誤,為產品的實際制造提供數(shù)據(jù)參考。
[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.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG333.21

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本文編號：1896310