【摘要】：隨著現(xiàn)在科技的高速發(fā)展,對機械加工的要求也就越來越高。我國關于深孔加工減振技術的研究,遠落后于發(fā)達國家。大長徑比鏜桿作為主要深孔加工工具,直接影響深孔加工技術的發(fā)展。而導致大長徑比鏜桿技術研究進展緩慢的一個重要原因就是,對影響其振動的主要參數(shù)了解不足。從這個問題出發(fā),本文將研究影響大長徑比鏜桿振動的主要因素。 首先,本文以細長桿代替鏜桿進行模態(tài)仿真,得到各階模態(tài)及所對應的最大變形區(qū)域。又對其進行頻響分析,得到鏜桿最大振幅發(fā)生在基頻下。根據(jù)基頻下的振型,在相應位置處添加動力吸振器,并建立理論模型,計算出最佳阻尼比和最佳頻率比。 其次,根據(jù)懸臂梁的撓度理論,分析鏜桿空腔直徑及長度對鏜桿振動的影響,最終確定本文研究的鏜桿空腔直徑及長度,并根據(jù)減振鏜桿理論模型中所求的參數(shù),求出鏜桿吸振器中各參數(shù)的值,并對所求的參數(shù)進行優(yōu)化。 第三,采用有限元仿真的方法,建立鏜桿吸振器主要參數(shù)與鏜桿振動的聯(lián)系,并仿真分析吸振器主要參數(shù)對鏜桿振動影響規(guī)律,及進行實驗來驗證以上仿真的正確性。 第四,建立在實際加工中切削參數(shù)與鏜桿受力的聯(lián)系,并采用有限元仿真在實際加工中鏜桿受力與鏜桿振動的關系,用于研究切削參數(shù)對鏜桿振動的影響規(guī)律,并對以上仿真內容進行實驗來驗證分析的正確性。
[Abstract]:With the rapid development of science and technology, the requirement of machining is becoming higher and higher. The research on vibration absorption technology of deep hole processing in China lags far behind the developed countries. As the main tool of deep hole machining, large aspect ratio boring bar has a direct impact on the development of deep hole processing technology. An important reason for the slow development of the boring bar technology with large aspect ratio is the lack of understanding of the main parameters that affect its vibration. Starting from this problem, this paper will study the main factors that affect the vibration of boring bar with large aspect ratio. First, the slender bar is used instead of the boring bar for modal simulation, and the corresponding maximum deformation region is obtained. The frequency response analysis shows that the maximum amplitude of boring bar occurs at the fundamental frequency. According to the mode shape of the base frequency, the dynamic vibration absorber is added at the corresponding position, and the theoretical model is established to calculate the optimum damping ratio and the optimal frequency ratio. Secondly, according to the deflection theory of cantilever beam, the influence of bore cavity diameter and length on the vibration of boring bar is analyzed. Finally, the diameter and length of boring bar cavity are determined, and the parameters are obtained according to the theoretical model of damping boring bar. The values of the parameters in the vibration absorber of the boring bar are obtained, and the parameters are optimized. Thirdly, the relationship between the main parameters of the vibration absorber and the vibration of the boring bar is established by using the finite element simulation method, and the influence of the main parameters of the absorber on the vibration of the boring bar is analyzed by simulation, and the correctness of the above simulation is verified by experiments. Fourthly, the relationship between cutting parameters and boring bar force is established in actual machining, and the relationship between boring bar force and boring bar vibration is simulated by finite element method, which is used to study the influence of cutting parameters on boring bar vibration. Experiments on the above simulation contents are carried out to verify the correctness of the analysis.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG53

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