本文關(guān)鍵詞：減振鏜桿的動力學仿真及其參數(shù)優(yōu)化　出處：《西華大學》2011年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 動力減振 動力學理論分析 Ansys動力學仿真 參數(shù)優(yōu)化

【摘要】：隨著機械制造工業(yè)的不斷向前發(fā)展,制造行業(yè)所涉及的領(lǐng)域越來越廣。與此同時,由于市場競爭的不斷加劇,對機械加工質(zhì)量和加工效率的要求不斷提高。在各種各樣加工內(nèi)容中,孔加工特別是深而且口徑小的孔的加工是一種經(jīng)常碰見的加工內(nèi)容。對于采用鏜削加工方法進行的深孔加工,由于其加工的環(huán)境比較特殊,通常情況下要求鏜孔用的鏜桿細而且長,一旦鏜桿的長徑比超過4倍后,鏜桿的剛度會快速的降低。鏜桿剛度的降低,使得鏜桿在進行鏜孔加工時產(chǎn)生較大的振動,從而使孔的加工質(zhì)量無法滿足加工要求,甚至使加工無法進行。因此,采取怎樣的措施來減小大長徑比鏜桿在鏜削過程中的振動已經(jīng)是急需想法解決的一個問題。 關(guān)于鏜削過程的研究,傳統(tǒng)方法是建立鏜桿減振系統(tǒng)的數(shù)學模型,列出響應(yīng)的動力學方程,通過數(shù)學的手段來進行鏜桿的振動性能分析,但這種分析方法運算復雜,效率較低。本課題采用能解決復雜工程問題的有限元法來對問題進行分析,同時借助目前應(yīng)用得比較廣泛的通用有限元軟件Ansys來進行相關(guān)的分析計算。通過使用有限元分析軟件Ansys可以對機械振動系統(tǒng)進行動力學仿真并進行準確求解,預(yù)測出鏜桿的動力學性能,實現(xiàn)對影響鏜桿振動的情況的相關(guān)因素的分析,通過對相關(guān)的影響因素進行參數(shù)優(yōu)化,達到最佳的減振效果,這樣不僅可以提高產(chǎn)品的性能、縮短研發(fā)的時間,同時也能減少產(chǎn)品的開發(fā)費用,減少材料的浪費。 在本課題的研究中,廣泛查閱了國外的先進的減振鏜桿的結(jié)構(gòu)設(shè)計,認真分析其減振理論,通過對比分析,最終選擇借鑒瑞典Sandvik公司所設(shè)計的內(nèi)置式動力減振鏜桿的結(jié)構(gòu)來作為所設(shè)計的減振鏜桿的主要參考結(jié)構(gòu),再結(jié)合國內(nèi)生產(chǎn)制造的實情進行局部改進,完成了減振鏜桿的設(shè)計。在進行減振鏜桿的減振系統(tǒng)動力學分析時,首先使用理論的方法,應(yīng)用數(shù)學手段初步得出可行的減振系統(tǒng)中各參數(shù)的初始值,然后在有限元分析軟件Ansys中建立所設(shè)計的減振鏜桿的有限元模型,使用Ansys對減振鏜桿進行動力學仿真,得出鏜桿的相關(guān)動態(tài)特性參數(shù)。在此基礎(chǔ)上以刀尖徑向振動幅值最小為目標,利用有限元軟件Ansys的優(yōu)化分析功能對所選擇的主要參數(shù)進行優(yōu)化,得到減振系統(tǒng)的最優(yōu)參數(shù)值。 通過本文的研究分析,可以為內(nèi)置式的動力減振鏜桿的設(shè)計和改進提供可靠的依據(jù),解決了用傳統(tǒng)方法很難精確求解減振鏜桿動態(tài)性能參數(shù)的難題,對內(nèi)置式動力減振鏜桿的研發(fā)有重要的指導意義。
[Abstract]:With the continuous development of the machinery manufacturing industry, the manufacturing industry involves more and more fields. At the same time, due to the increasing competition in the market. The requirements for machining quality and efficiency are constantly improving. In a variety of processing content. Hole machining, especially deep and small hole machining, is a kind of processing content that is often encountered. For the deep hole machining with boring method, because of its processing environment is relatively special. The boring bar is usually required to be fine and long. Once the length to diameter ratio of the boring bar exceeds 4 times, the stiffness of the boring bar will be reduced quickly and the stiffness of the boring bar will be reduced. Make boring bar in boring machining to produce a larger vibration, so that the hole processing quality can not meet the processing requirements, and even the processing can not be carried out. How to reduce the vibration of boring bar with large aspect ratio is an urgent problem. On the research of boring process, the traditional method is to establish the mathematical model of vibration absorption system of boring bar, to list the dynamic equation of response, and to analyze the vibration performance of boring bar by mathematical means. However, this analysis method is complex and inefficient. In this paper, the finite element method which can solve the complex engineering problems is used to analyze the problem. The dynamic simulation of mechanical vibration system can be carried out by using the finite element analysis software Ansys. To solve the problem accurately. The dynamic performance of the boring bar is predicted and the related factors that affect the vibration of the boring bar are analyzed. The optimal damping effect is achieved by optimizing the parameters of the related factors. This can not only improve the performance of the product, shorten the time of research and development, but also reduce the cost of product development and reduce the waste of materials. In the research of this subject, the structure design of the advanced vibration absorption boring bar abroad is widely consulted, and the theory of vibration absorption is analyzed carefully, and through comparative analysis. Finally, we choose the structure of the built-in dynamic vibration absorption boring bar designed by Sweden Sandvik Company as the main reference structure of the designed vibration absorption boring bar. The design of vibration absorption boring bar is completed, and the theory method is used in the dynamic analysis of vibration absorption system of the vibration absorption boring bar. The initial values of the parameters in the feasible vibration absorption system are obtained by mathematical means, and then the finite element model of the designed vibration absorption boring bar is established in the finite element analysis software Ansys. The dynamic simulation of vibration absorption boring bar is carried out by using Ansys, and the related dynamic characteristic parameters of boring bar are obtained. On this basis, the minimum amplitude of radial vibration at the tip of the cutter is taken as the goal. The optimization analysis function of finite element software Ansys is used to optimize the selected main parameters, and the optimal parameters of the damping system are obtained. Through the research and analysis of this paper, it can provide a reliable basis for the design and improvement of the built-in dynamic vibration absorption boring bar, and solve the problem that the traditional method is difficult to accurately solve the dynamic performance parameters of the vibration absorption boring bar. It has important guiding significance for the research and development of the built-in dynamic vibration absorption boring bar.
【學位授予單位】：西華大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TG53;TH113

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