發(fā)布時間：2018-10-18 12:00

【摘要】：弧面凸輪機構(gòu)是高速、高精度間歇分度運動的核心部件,在自動機械的間歇轉(zhuǎn)位中應用廣泛,但設(shè)計和加工困難,承載力有限。采用多曲面段弧面凸輪能夠在一定程度上增加機構(gòu)重合度,實現(xiàn)負載能力提升。本文在此基礎(chǔ)上提出了偏置冗余的概念,在一定程度上降低加工難度,提高加工精度。本課題提出了多曲面段弧面凸輪新設(shè)計方法,豐富了弧面凸輪機構(gòu)設(shè)計理論,提高承載能力,降低加工難度。以傳統(tǒng)弧面凸輪機構(gòu)設(shè)計理論為依據(jù),通過數(shù)學方法精確建模,運用數(shù)字化設(shè)計方法對其結(jié)構(gòu)進行創(chuàng)新設(shè)計。以CAD/CAM技術(shù)進行參數(shù)化建模,以CAE技術(shù)對設(shè)計結(jié)果仿真分析,通過幾種實際案例對多曲面段弧面凸輪機構(gòu)進行比較,驗證設(shè)計合理性。對銷軸受力及彈性變形校核,通過對從動轉(zhuǎn)盤施加不同力矩探討銷軸最小尺寸。具體研究內(nèi)容有:(1)應用變換張量、微分幾何等數(shù)學工具,以成熟的研究成果為基礎(chǔ)簡要論述了弧面凸輪通用廓面方程及運動規(guī)律,并在創(chuàng)新設(shè)計中運用。借助Matlab、UG、Ansys Workbench等軟件建立不同案例中的三維模型和虛擬裝配,再進行仿真分析,驗證設(shè)計正確性。(2)按照新的設(shè)計方法設(shè)計幾種不同形式的多曲面段弧面凸輪機構(gòu),通過運動學仿真對該機構(gòu)幾種不同結(jié)構(gòu)進行設(shè)計比較,優(yōu)化設(shè)計。再對銷軸和滾子等零部件運用CAE工具進行彈性力學分析,結(jié)合實驗數(shù)據(jù)分析計算,給出銷軸和滾子的設(shè)計尺寸參考標準,為多曲面段弧面凸輪機構(gòu)的設(shè)計與參數(shù)選擇提供理論依據(jù)與研究方法。(3)根據(jù)幾組不同類型的弧面凸輪機構(gòu)銷軸受力分析,驗證設(shè)計案例中偏置式冗余弧面凸輪機構(gòu)能夠有效提高承載能力。通過對仿真結(jié)果分析計算,論證偏置式冗余弧面凸輪機構(gòu)的運動學和動力學性能及受力情況。(4)將采用上述方法設(shè)計的偏置式冗余弧面凸輪機構(gòu)運用于凸輪分割器的設(shè)計中,根據(jù)機械設(shè)計手冊設(shè)計各零部件結(jié)構(gòu)及尺寸,建立三維模型,通過虛擬裝配校正設(shè)計,再經(jīng)過仿真分析優(yōu)化設(shè)計。繪制二維零件圖、裝配圖,為下一步試加工做準備。
[Abstract]:The globoidal cam mechanism is the core component of high speed and high precision intermittent indexing motion. It is widely used in the intermittent transposition of automatic machinery, but it is difficult to design and process, and its bearing capacity is limited. The multi-curved globoidal cam can increase the coincidence degree of the mechanism to a certain extent and enhance the load capacity. In this paper, the concept of bias redundancy is put forward to reduce machining difficulty and improve machining precision to some extent. In this paper, a new design method of multi-curved globoidal cam is proposed, which enriches the design theory of globoidal cam mechanism, improves the bearing capacity and reduces the processing difficulty. Based on the traditional design theory of globoidal cam mechanism, the mathematical method is used to model the cam mechanism accurately, and the digital design method is used to design its structure innovatively. Parameterized modeling based on CAD/CAM technology, simulation analysis of design results by CAE technology, comparison of multi-curved globoidal cam mechanism with practical cases are carried out to verify the rationality of the design. The minimum size of the pin shaft is discussed by applying different torque to the follower rotary disc by checking the force and elastic deformation of the pin shaft. The specific research contents are as follows: (1) by using transformation Zhang Liang, differential geometry and other mathematical tools, the general profile equation and motion law of globoidal cam are briefly discussed on the basis of mature research results, and applied in innovative design. The 3D model and virtual assembly in different cases are built with the help of Matlab,UG,Ansys Workbench software, and then the simulation analysis is carried out to verify the correctness of the design. (2) according to the new design method, several kinds of multi-curved globoidal cam mechanisms are designed. Through kinematics simulation, several different structures of the mechanism are designed and compared to optimize the design. Then the elastic mechanics analysis of the parts such as pin shaft and roller is carried out by using CAE tool, and the design dimension reference standard of pin shaft and roller is given according to the analysis and calculation of experimental data. It provides a theoretical basis and research method for the design and parameter selection of multi-curved globoidal cam mechanism. (3) according to several groups of different types of globoidal cam mechanism pin force analysis, It is verified that the offset type redundant globoidal cam mechanism can effectively improve the bearing capacity in the design case. Through the analysis and calculation of the simulation results, the kinematics and dynamics of the offset redundant globoidal cam mechanism and its force are demonstrated. (4) the offset redundant globoidal cam mechanism designed by the above method is applied to the design of the cam splitter. According to the mechanical design manual, the structure and dimensions of each component are designed, and the three-dimensional model is established. Draw two-dimensional part drawing, assembly drawing, prepare for the next trial processing.
【學位授予單位】：陜西科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH112.2

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