發(fā)布時間：2018-06-27 07:34

  本文選題：圓柱凸輪機構 + 冗余結(jié)構��； 參考：《陜西科技大學》2017年碩士論文

【摘要】：圓柱凸輪機構是自動機械中常見的傳動機構。它可以實現(xiàn)從動部件任意運動規(guī)律,并且加工相對容易,成本較低。機構在運動過程中,特別是機構加速度發(fā)生換向時,會發(fā)生常見的橫越?jīng)_擊現(xiàn)象,影響機構的傳動穩(wěn)定性,因此現(xiàn)有圓柱凸輪機構在動力特性方面存在缺陷和不足。本課題提出了改善機構此方面特性的兩種含有冗余結(jié)構的圓柱凸輪機構,分別是大小滾子圓柱凸輪機構和雙層滾子圓柱凸輪機構。本文內(nèi)容主要有以下幾個方面:(1)在廣泛閱讀文獻的基礎上,對國內(nèi)外圓柱凸輪機構的現(xiàn)狀進行了總結(jié)。介紹了課題的主要研究內(nèi)容,分析了現(xiàn)階段圓柱凸輪機構在實際應用中的優(yōu)缺點。為改善現(xiàn)有圓柱凸輪機構運動特性,典型性的提出了大小滾子圓柱凸輪機構和雙層滾子圓柱凸輪機構。同時,論文給出了本課題的主要創(chuàng)新點和研究方法。(2)論文對圓柱凸輪機構的一些基礎理論,主要是機構的運動規(guī)律、機構的運動參數(shù)、機構的主要尺寸、機構的廓面方程等方面作了梳理總結(jié)。在原有圓柱凸輪機構的基礎上,提出了圓柱凸輪機構冗余結(jié)構的概念。分別針對含有冗余結(jié)構的大小滾子圓柱凸輪機構和雙層滾子圓柱凸輪機構進行了分析與說明。(3)在彈性變形假設的條件下,對大小滾子圓柱凸輪機構和雙層滾子圓柱凸輪機構冗余結(jié)構部分進行了相關彈性變形計算。大小滾子圓柱凸輪機構通過考慮在不同條件下小滾子銷軸彈性變形,計算出其所能承受最大載荷值,給出了相關參數(shù)的結(jié)論數(shù)據(jù)表;雙層滾子圓柱凸輪機構考慮在凸輪廓面和滾子接觸彈性變形條件下,給出了滾子的選擇依據(jù)參數(shù)表及滾子發(fā)生彈性變形的形變量數(shù)值表。(4)依據(jù)等距曲面原理和圓柱凸輪機構廓面方程,采用三維設計軟件Pro/E完成了大小滾子凸輪機構和雙層滾子凸輪機構的三維建模。關鍵是依據(jù)不同的冗余結(jié)構要求完成大小滾子凸輪和雙層滾子凸輪本體的建模,同時分別設計相對應分讀盤的三維模型。(5)采用軟件ADAMS仿真完成了普通圓柱凸輪機構以及含冗余結(jié)構圓柱凸輪機構的運動學和動力學仿真。將后者仿真得到的分度盤后處理結(jié)果與前者相比較,驗證冗余機構的有效性。同時將冗余機構仿真結(jié)果與理論計算出的結(jié)果進行比較。最后針對大小滾子圓柱凸輪機構作了剛?cè)狁詈蟿恿W仿真分析。
[Abstract]:Cylindrical cam mechanism is a common transmission mechanism in automatic machinery. It can realize any movement rule of follower, and it is relatively easy to process and low cost. In the process of motion, especially when the acceleration of the mechanism changes direction, the common phenomenon of cross impact will occur, which will affect the transmission stability of the mechanism. Therefore, the existing cylindrical cam mechanism has some defects and deficiencies in the dynamic characteristics of the mechanism. In this paper, two kinds of cylindrical cam mechanisms with redundant structure are proposed to improve the characteristics of the mechanism. They are the size roller cylindrical cam mechanism and the double-layer roller cylindrical cam mechanism. The main contents of this paper are as follows: (1) based on the extensive reading of literature, the present situation of cylindrical cam mechanism at home and abroad is summarized. The main research contents of this paper are introduced, and the advantages and disadvantages of cylindrical cam mechanism in practical application are analyzed. In order to improve the kinematic characteristics of the existing cylindrical cam mechanism, the size roller cylindrical cam mechanism and the double roller cylindrical cam mechanism are proposed. At the same time, the main innovation points and research methods of this thesis are given. (2) some basic theories of cylindrical cam mechanism are presented in this paper, including the motion law of the mechanism, the motion parameters of the mechanism, the main dimensions of the mechanism, and so on. The outline equation of the mechanism is summarized. Based on the original cylindrical cam mechanism, the concept of redundant structure of cylindrical cam mechanism is proposed. The size roller cylindrical cam mechanism with redundant structure and the double roller cylindrical cam mechanism are analyzed and explained respectively. (3) under the assumption of elastic deformation, The relative elastic deformation of the redundant structure of the large and small roller cylindrical cam mechanism and the double roller cylindrical cam mechanism is calculated. By considering the elastic deformation of small roller pin shaft under different conditions, the size roller cylindrical cam mechanism calculates the maximum load value it can bear, and gives the conclusion data table of relevant parameters. The double roller cylindrical cam mechanism is considered under the condition of the contact elastic deformation of the cam profile and the roller. The selection of roller is based on the parameter table and the form variable numerical table of the roller elastic deformation. (4) according to the principle of equidistant surface and the profile equation of cylindrical cam mechanism, The 3D modeling of the large and small roller cam mechanism and the double roller cam mechanism is completed by using the three dimensional design software Prop / E. The key is to complete the modeling of the size roller cam and the double roller cam body according to the different redundant structure requirements. At the same time, the corresponding three-dimensional models of the read disk are designed. (5) the kinematics and dynamics simulation of the ordinary cylindrical cam mechanism and the cylindrical cam mechanism with redundant structure are completed by using the software Adams. The post-processing results obtained from the latter simulation are compared with the former to verify the effectiveness of the redundant mechanism. At the same time, the simulation results of redundant mechanism are compared with the calculated results. Finally, the rigid-flexible coupling dynamics simulation analysis is made for the cylindrical cam mechanism with large and small rollers.
【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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本文編號：2073171