本文選題：萬能銑頭 + 角接觸球軸承��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：高端數(shù)控機(jī)床現(xiàn)已成為航空航天、汽車、裝備制造等制造領(lǐng)域發(fā)展的核心裝備。萬能銑頭作為數(shù)控加工中心的主要工作部件起到了非常關(guān)鍵的作用。通過對(duì)萬能銑頭球軸承-螺旋錐齒輪系統(tǒng)動(dòng)力學(xué)性能分析,以此來改進(jìn)萬能銑頭系統(tǒng)性能,進(jìn)而提高機(jī)床系統(tǒng)運(yùn)行穩(wěn)定性與可靠性具有重要的意義。本文來源于國(guó)家自然科學(xué)基金項(xiàng)目“高性能滾動(dòng)軸承-螺旋錐齒輪系統(tǒng)柔性多體接觸動(dòng)力學(xué)研究”(11462008)�；诙囿w動(dòng)力學(xué)(Multi Body Dynamics,MBD)理論和有限元分析(Finite Element Analysis,FEA)方法,建立了考慮球軸承保持架柔性變形以及主軸柔性變形的萬能銑頭球軸承-螺旋錐齒輪系統(tǒng)的多體動(dòng)力學(xué)模型,分析了系統(tǒng)的動(dòng)力學(xué)特性。主要研究工作如下:(1)運(yùn)用經(jīng)典Hertz接觸理論,在ADAMS中建立了考慮保持架柔性化的角接觸球軸承剛?cè)狁詈隙囿w動(dòng)力學(xué)模型。分析了不同徑向載荷和軸向載荷對(duì)角接觸球軸承動(dòng)力學(xué)特性的影響。分析發(fā)現(xiàn):軸向載荷的增大對(duì)提高軸承運(yùn)行穩(wěn)定性具有明顯的作用;徑向載荷的增加會(huì)降低軸承運(yùn)行的穩(wěn)定性。(2)建立了成對(duì)雙聯(lián)角接觸球軸承多剛體動(dòng)力學(xué)模型以及雙列角接觸球軸承多剛體動(dòng)力學(xué)模型,對(duì)比分析了兩種不同類型的角接觸球軸承在同一邊界條件下的動(dòng)態(tài)響應(yīng)。研究發(fā)現(xiàn):成對(duì)雙聯(lián)角接觸球軸承與雙列角接觸球軸承動(dòng)態(tài)響應(yīng)具有一定的相似性,但是后者運(yùn)行穩(wěn)定性更好。(3)基于UG所建立的螺旋錐齒輪裝配關(guān)系,利用角接觸球軸承結(jié)合部整體等效為彈簧-阻尼的方法,建立了常見的45°、90°軸交角的角接觸球軸承完全整體等效結(jié)合部-螺旋錐齒輪傳動(dòng)系統(tǒng)模型,分析了在不同等效剛度值下系統(tǒng)的動(dòng)態(tài)響應(yīng),發(fā)現(xiàn)隨著軸承整體等效剛度的增加,系統(tǒng)的動(dòng)態(tài)性能更加穩(wěn)定。通過對(duì)比基于MBD方法所建立的真實(shí)角接觸球軸承-螺旋錐齒輪多剛體接觸動(dòng)力學(xué)模型,表明球軸承內(nèi)部多體動(dòng)態(tài)接觸特性對(duì)螺旋錐齒輪傳動(dòng)系統(tǒng)動(dòng)態(tài)性能有著重要的影響,這是傳統(tǒng)的軸承結(jié)合部等效彈簧-阻尼建模方法所不能探究的。(4)建立了計(jì)及柔性保持架以及柔性主軸的萬能銑頭球軸承-螺旋錐齒輪系統(tǒng)剛?cè)狁詈隙囿w動(dòng)力學(xué)模型,分析了低速重載和高速輕載下的萬能銑頭球軸承-螺旋錐齒輪系統(tǒng)的動(dòng)力學(xué)特性。通過對(duì)齒輪振動(dòng)加速度、齒輪接觸力、球軸承內(nèi)部接觸力和保持架運(yùn)行穩(wěn)定性等計(jì)算結(jié)果分析表明:螺旋齒輪振動(dòng)加速度頻譜成分均表現(xiàn)為嚙合頻域及其倍頻,低速重載時(shí)螺旋錐齒輪嚙合特性較高速輕載時(shí)要穩(wěn)定;軸承的動(dòng)力學(xué)特性在高速輕載時(shí)較低速重載時(shí)不穩(wěn)定。
[Abstract]:High-end CNC machine tools have become the core equipment of aerospace, automobile, equipment manufacturing and other manufacturing fields. Universal milling head, as the main working part of NC machining center, plays a very important role. It is of great significance to improve the performance of universal milling head system by analyzing the dynamic performance of universal milling head ball bearing and spiral bevel gear system, and then to improve the running stability and reliability of machine tool system. This paper comes from the project of National Natural Science Foundation of China "Research on flexible Multi-body contact Dynamics of High-Performance Rolling bearing-Spiral Bevel Gear system" (11462008). Based on the theory of multi-body dynamics and finite Element analysis, a multi-body dynamic model of universal milling head ball bearing-spiral bevel gear system considering flexible deformation of ball bearing cage and flexible deformation of spindle is established. The dynamic characteristics of the system are analyzed. The main research work is as follows: (1) based on the classical Hertz contact theory, a rigid-flexible coupling multi-body dynamic model of angular contact ball bearing with flexible cage is established in ADAMS. The effects of different radial and axial loads on the dynamic characteristics of angular contact ball bearings are analyzed. It is found that the increase of axial load has obvious effect on improving the stability of bearing. The stability of bearing is reduced by increasing radial load.) the multi-rigid body dynamic model and the multi-rigid body dynamic model of double-angle-contact ball bearing are established. The dynamic responses of two kinds of angular contact ball bearings under the same boundary condition are analyzed. It is found that the dynamic response of twin contact ball bearings is similar to that of double-row angular contact ball bearings, but the latter has better running stability, and the assembly relationship of spiral bevel gears based on UG is better. By using the method that the joint part of angular contact ball bearing is equivalent to spring damping, a common transmission system model of 45 擄90 擄angle angular contact ball bearing with complete integral equivalent joint part and spiral bevel gear is established. The dynamic response of the system under different equivalent stiffness values is analyzed. It is found that the dynamic performance of the system is more stable with the increase of the overall equivalent stiffness of the bearing. By comparing the real angular contact ball bearing with spiral bevel gear multi-rigid body contact dynamic model based on MBD method, it is shown that the dynamic contact characteristics of the ball bearing have an important influence on the dynamic performance of the spiral bevel gear transmission system. This is the traditional equivalent spring-damping modeling method of bearing joint which can not be explored.) the multi-body dynamic model of rigid and flexible coupling of universal milling head ball bearing-spiral bevel gear system with flexible cage and flexible spindle is established. The dynamic characteristics of universal milling head ball bearing-spiral bevel gear system under low speed heavy load and high speed light load are analyzed. Through the analysis of the calculation results of gear vibration acceleration, gear contact force, internal contact force of ball bearing and operation stability of cage, it is shown that the frequency spectrum of vibration acceleration of spiral gear is meshing frequency domain and its frequency doubling. The meshing characteristics of spiral bevel gear at low speed and heavy load are more stable than those at high speed and light load, and the dynamic characteristics of bearing are unstable at high speed and light load compared with low speed and heavy load.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG659

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