【摘要】：本研究課題來源于本校與杭州××數(shù)控機床有限公司的合作項目,主要將用于加工曲軸端面的臥式曲軸端面加工中心的設計改進作為研究內容。由于曲軸外形結構特殊,傳統(tǒng)的臥式車削和立式銑削已經(jīng)沒有辦法達到曲軸越來越高的加工要求及效率。鑒于企業(yè)需求及現(xiàn)有機床存在的不足,本文對曲軸端面加工中心進行結構設計,并對結構進行優(yōu)化從而改善其動態(tài)性能,這對提高曲軸端面加工效率和精度有著重要的意義。本文對比國內外對曲軸端面加工中心的研究現(xiàn)狀,分析在機床動態(tài)性能研究上的優(yōu)點以及不足之處,并根據(jù)曲軸的自身特點以及對曲軸加工的功能需求,對曲軸端面加工中心主要功能進行分析,以經(jīng)濟性、高性能為原則對曲軸端面加工中心進行結構設計。建立臥式曲軸端面加工中心三維模型及其力學模型,結合采用ADAMS對模型進行運動學及動力學仿真,得到在滿足功能要求的情況下重要部件的位移、速度、加速度等運動特性和受力情況,驗證了加工中心部件運動的合理性,并為后續(xù)的電器選型和力學分析提供了重要的理論依據(jù)。建立曲軸端面加工中心的有限元模型,通過ANSYS Workbench對其重要部件進行靜態(tài)特性分析,得到部件的應力分布及變形情況,并對其中靜剛度薄弱環(huán)節(jié)進行改進優(yōu)化;通過對曲軸端面加工中心進行動態(tài)性能分析,得到機床的固有頻率及振型,并對其進行諧響應分析,研究機床動態(tài)性能薄弱環(huán)節(jié),并進行改進優(yōu)化;通過靜、動態(tài)特性分析并經(jīng)過合理優(yōu)化后進行優(yōu)化前后對比,驗證優(yōu)化的可行性,達到了在提高部件動態(tài)性能的同時也節(jié)省了材料的目的。本文對臥式曲軸端面加工中心結構進行設計,機床床身采用正T型整體式設計、主軸箱非重心驅動并配合非對稱式立柱,這使得機床整體結構緊湊,并對改善機床的動態(tài)性能有重要的意義。對加工中心的機械結構進行研究,并未涉及機床上的電器及控制系統(tǒng),需具體考慮后續(xù)選型安裝;本文中加工中心的分析與研究在計算機環(huán)境中完成,沒有相應實物樣機進行試驗,因此還需根據(jù)實際情況對樣機進一步改進。
[Abstract]:This research project comes from the cooperation project between our school and Hangzhou 脳 脳 NC Machine tool Co., Ltd. It mainly focuses on the design and improvement of horizontal crankshaft end surface machining center used for crankshaft end face processing. Because of the special shape and structure of the crankshaft, the traditional horizontal turning and vertical milling can not meet the higher machining requirements and efficiency of the crankshaft. In view of the needs of enterprises and the shortcomings of existing machine tools, this paper designs the structure of the crankshaft end surface machining center and optimizes the structure to improve its dynamic performance, which is of great significance to improve the efficiency and accuracy of the crankshaft end face machining. This paper compares the research status of crankshaft face machining center at home and abroad, analyzes the advantages and disadvantages of the research on the dynamic performance of machine tools, and according to the characteristics of crankshaft and the functional requirements of crankshaft machining, The main functions of crankshaft end surface machining center are analyzed and the structure of crankshaft end face machining center is designed based on the principle of economy and high performance. The 3D model of horizontal crankshaft face machining center and its mechanical model are established, and the kinematics and dynamics simulation of the model is carried out by using ADAMS. The displacement and velocity of important parts are obtained when the functional requirements are satisfied. The motion characteristics such as acceleration and force condition verify the rationality of the motion of machining center parts, and provide an important theoretical basis for the subsequent electrical equipment selection and mechanical analysis. The finite element model of crankshaft end surface machining center is established, and the static characteristics of its important parts are analyzed by ANSYS Workbench. The stress distribution and deformation of the parts are obtained, and the weak links of static stiffness are improved and optimized. Through the dynamic performance analysis of the crankshaft end face machining center, the natural frequency and vibration mode of the machine tool are obtained, and the harmonic response analysis is carried out to study the weak link of the dynamic performance of the machine tool, and to improve and optimize the machine tool. The feasibility of optimization is verified by analyzing static and dynamic characteristics and comparing before and after optimization after reasonable optimization. The purpose of improving the dynamic performance of components and saving materials is achieved. In this paper, the machining center structure of horizontal crankshaft face is designed. The machine bed is designed with a positive T type integral type, and the spindle box is driven by non-gravity center and matched with asymmetric column, which makes the overall structure of the machine tool compact. It is of great significance to improve the dynamic performance of machine tools. The mechanical structure of the machining center is not related to the electrical apparatus and control system of the machine tool, so it is necessary to consider the subsequent selection and installation. In this paper, the analysis and research of machining center is completed in the computer environment, no corresponding physical prototype is tested, so it is necessary to further improve the prototype according to the actual situation.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG659

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