本文選題：弧面凸輪　切入點：數(shù)控轉(zhuǎn)臺　出處：《集美大學(xué)》2015年碩士論文

【摘要】：隨著社會的發(fā)展和科技的進步,數(shù)控機床的應(yīng)用和普及也越來越廣泛,數(shù)控轉(zhuǎn)臺作為數(shù)控機床的核心功能部件之一,其性能的高低對數(shù)控機床的整體加工精度影響較大,改進數(shù)控轉(zhuǎn)臺的傳動機構(gòu)使其具有重載、高速、高效率、動態(tài)性能良好等特點已經(jīng)成為當下研究的熱點。因弧面凸輪具有承載能力強,傳動精度高等特點受到廣泛應(yīng)用,將弧面凸輪應(yīng)用于數(shù)控轉(zhuǎn)臺傳動對改善和提高轉(zhuǎn)臺的傳動特性具重要的理論研究意義和實際應(yīng)用價值。本文以數(shù)控轉(zhuǎn)臺作為研究對象,針對牧野臥式加工中心的T2型數(shù)控轉(zhuǎn)臺,將弧面凸輪應(yīng)用于該型數(shù)控轉(zhuǎn)臺的傳動設(shè)計中。首先對弧面凸輪結(jié)構(gòu)的主要尺寸進行設(shè)計,然后在UG軟件中對其進行三維實體建模并導(dǎo)入有限元軟件中進行靜力分析和模態(tài)分析,最后對弧面凸輪機電耦合動力學(xué)特性進行了研究,主要研究內(nèi)容和工作成果如下:(1)根據(jù)弧面凸輪傳動特點,采用回轉(zhuǎn)變化張量法對弧面凸輪的工作廓面矢量方程、空間嚙合方程、壓力角和接觸應(yīng)力等進行了推導(dǎo),并且根據(jù)數(shù)控轉(zhuǎn)臺的實際工作參數(shù)選定傳動方案和電機,然后以推導(dǎo)的壓力角和接觸應(yīng)力為約束設(shè)計條件,確定了弧面凸輪的主要結(jié)構(gòu)尺寸,同時結(jié)合推導(dǎo)的壓力角公式,討論分析了結(jié)構(gòu)尺寸參數(shù)對壓力角的影響,指出了減小壓力角的方法。(2)根據(jù)推導(dǎo)的工作廓面矢量方程和空間嚙合方程,采用UG軟件對弧面凸輪進行了三維實體建模,同時為了便于比較,分別給出了圓柱滾子和圓錐滾子兩種弧面凸輪的實體模型,并通過對兩種類型弧面凸輪的運動仿真分析驗證了模型建立和裝配的正確性。(3)采用ANSYS Workbench對圓柱滾子和圓錐滾子兩種類型弧面凸輪進行有限元分析,分析在施加相同載荷情況下弧面凸輪的變形、應(yīng)變和應(yīng)力特性,結(jié)果發(fā)現(xiàn)存在較大應(yīng)力的位置均為凸輪與轉(zhuǎn)動盤滾子接觸處,該情況與弧面凸輪實際工作狀況相符合,驗證了弧面凸輪靜力分析的裝配約束和載荷加載的正確性。對比兩種類型的弧面凸輪靜力特性,結(jié)果表明圓錐型滾子弧面凸輪的最大應(yīng)力值399.21MPa要小于圓柱型滾子弧面凸輪的最大應(yīng)力值425.14MPa,其靜力學(xué)特性要優(yōu)于圓柱型弧面凸輪,承載能力也更強,同時為了避免共振形成的過大應(yīng)力,對弧面凸輪進行了模態(tài)分析并給出了相應(yīng)的固有頻率和振型。(4)采用聯(lián)合仿真的方法在ADAMS和Matlab/Simulink軟件中對弧面凸輪的機電耦合動態(tài)特性進行研究,通過對弧面凸輪角速度,角加速度和接觸應(yīng)力的仿真曲線分析可以確定弧面凸輪滿足數(shù)控轉(zhuǎn)臺連續(xù)傳動的要求,并且轉(zhuǎn)動盤運動規(guī)律與控制要求一致,證明所設(shè)計的弧面凸輪是可行的。對比PI控制前后的曲線,結(jié)果表明采用PI控制后的弧面凸輪受力情況和傳動平穩(wěn)性均得到較大改善。
[Abstract]:With the development of society and the progress of science and technology, the application and popularization of CNC machine tools are more and more extensive. As one of the core functional components of CNC machine tools, the performance of CNC turntables has a great impact on the overall machining accuracy of CNC machine tools. Improving the transmission mechanism of the CNC turntable has become a hot topic in the present research field because of its characteristics of heavy load, high speed, high efficiency, good dynamic performance, etc. The globoidal cam has been widely used because of its strong bearing capacity and high transmission precision. The application of globoidal cam to the transmission of NC turntable has important theoretical research significance and practical application value in improving and improving the transmission characteristics of the turntable. This paper takes the NC turntable as the research object, aiming at the T2 type NC turntable in the Muye horizontal machining center. The globoidal cam is applied to the drive design of the CNC turntable. Firstly, the main dimensions of the globoidal cam structure are designed. Then the 3D solid modeling is carried out in UG software, and the static analysis and modal analysis are carried out in the finite element software. Finally, the electromechanical coupling dynamic characteristics of the globoidal cam are studied. The main research contents and results are as follows: (1) according to the characteristics of globoidal cam transmission, the working profile vector equation, space meshing equation, pressure angle and contact stress of the globoidal cam are derived by using the rotating variable Zhang Liang method. According to the actual working parameters of the CNC turntable, the transmission scheme and motor are selected, and then the main structural dimensions of the globoidal cam are determined under the constraint design conditions of the derived pressure angle and contact stress, and the pressure angle formula is combined with the derived pressure angle formula. The influence of structural dimension parameters on pressure angle is discussed and analyzed. The method of reducing pressure angle is pointed out. According to the working profile vector equation and space meshing equation derived, the 3D solid modeling of globoidal cam is carried out with UG software. At the same time, for the sake of comparison, the solid models of two kinds of globoidal cam, cylindrical roller and conical roller, are given respectively. Through the simulation analysis of two types of globoidal cam, the correctness of the model establishment and assembly is verified. The finite element analysis of cylindrical roller and conical roller is carried out by using ANSYS Workbench. The deformation, strain and stress characteristics of the globoidal cam under the same load are analyzed. The results show that the position of the greater stress is the contact between the cam and the roller of the rotary disc, which is consistent with the actual working condition of the globoidal cam. The correctness of assembly constraint and load loading of globoidal cam static analysis is verified. The static characteristics of two types of globoidal cam are compared. The results show that the maximum stress value of the tapered roller globoidal cam 399.21MPa is smaller than the maximum stress value of the cylindrical roller globoidal cam 425.14 MPa, and its statics characteristic is better than that of the cylindrical globoidal cam, and its bearing capacity is also stronger. At the same time, in order to avoid the excessive stress caused by resonance, The modal analysis of globoidal cam is carried out, and the corresponding natural frequency and mode type are given. By using the method of joint simulation, the electromechanical coupling dynamic characteristics of globoidal cam are studied in ADAMS and Matlab/Simulink software, and the angular velocity of globoidal cam is studied. The simulation curve analysis of angular acceleration and contact stress can determine that the globoidal cam can meet the requirements of continuous transmission of NC turntable, and the motion law of the rotary disc is consistent with the control requirement. It is proved that the designed globoidal cam is feasible. Compared with the curve before and after Pi control, the results show that the force situation and the driving smoothness of the globoidal cam after Pi control are improved greatly.
【學(xué)位授予單位】：集美大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG659

【參考文獻】

相關(guān)期刊論文 前10條

1 王建林;張丹丹;;基于MATLAB和SolidWorks的弧面分度凸輪三維實體建模[J];包頭職業(yè)技術(shù)學(xué)院學(xué)報;2012年01期

2 陶學(xué)恒,肖正揚;弧面凸輪分度機構(gòu)動力學(xué)模型的理論探討[J];大連輕工業(yè)學(xué)院學(xué)報;1996年03期

3 李琳;劉學(xué);;壓電結(jié)構(gòu)系統(tǒng)機電耦合的強化與多階共振抑制[J];北京航空航天大學(xué)學(xué)報;2014年08期

4 程偉;張躍明;卜凡華;;弧面分度凸輪數(shù)控加工工藝研究[J];機械設(shè)計與制造;2011年03期

5 張高峰 ,楊世平 ,陳華章 ,周玉衡 ,譚援強;弧面分度凸輪的三維CAD[J];機械傳動;2003年06期

6 張敏紅;張一同;周定伍;;空間凸輪的行星磨削和行星磨頭[J];機械工程師;2006年11期

7 常宗瑜;張策;楊玉虎;宋軼民;劉建琴;;含間隙弧面分度凸輪機構(gòu)動力學(xué)的實驗研究[J];機械強度;2006年02期

8 常宗瑜,張策,楊玉虎,王玉新;運用凱恩方程建立弧面分度凸輪機構(gòu)的動力學(xué)模型[J];機械工程學(xué)報;2001年03期

9 孟杰;陳小安;合燁;;高速電主軸電動機—主軸系統(tǒng)的機電耦合動力學(xué)建模[J];機械工程學(xué)報;2007年12期

10 胡自化;張平;漆瑞;;連續(xù)分度空間弧面凸輪的多軸數(shù)控加工工藝研究[J];中國機械工程;2005年24期

，

本文編號：1672439