本文選題：電主軸 + 角接觸球軸承�。� 參考：《華中科技大學(xué)》2011年碩士論文

【摘要】：電主軸技術(shù)是隨著高速磨削等現(xiàn)代化制造技術(shù)以及高速CNC加工中心的發(fā)展和需求而發(fā)展起來的,隨著電主軸轉(zhuǎn)速和功率的不斷提高,高速電主軸的應(yīng)用越來越廣泛。高速電主軸的工作轉(zhuǎn)速常接近于轉(zhuǎn)子系統(tǒng)的一階臨界轉(zhuǎn)速,因此,需要對(duì)電主軸的結(jié)構(gòu),固有頻率和臨界轉(zhuǎn)速等動(dòng)態(tài)性能進(jìn)行分析計(jì)算。 本文利用球軸承分析計(jì)算的基本理論與方法,在分析角接觸球軸承內(nèi)部靜力學(xué)及動(dòng)力學(xué)狀態(tài)和進(jìn)行靜、動(dòng)剛度計(jì)算的基礎(chǔ)上,應(yīng)用有限元分析軟件ANSYS建立電主軸球軸承—轉(zhuǎn)子系統(tǒng)的參數(shù)化有限元模型,以提高電主軸靜剛度為優(yōu)化目標(biāo),對(duì)電主軸結(jié)構(gòu)進(jìn)行優(yōu)化分析,使電主軸結(jié)構(gòu)更緊湊,固有頻率及臨界轉(zhuǎn)速更高,振動(dòng)特性更好,尤其是其在臨界轉(zhuǎn)速內(nèi)的振動(dòng)特性。本文具體工作如下: 以Hertz彈性接觸理論為基礎(chǔ),對(duì)球軸承的幾何關(guān)系,接觸應(yīng)力變形及載荷分布進(jìn)行介紹。以角接觸球軸承為研究對(duì)象,分析其在徑向、軸向、軸向預(yù)緊及聯(lián)合載荷作用下的受力變形情況,得到其靜剛度。并進(jìn)一步考慮了角接觸球軸承高速旋轉(zhuǎn)時(shí)產(chǎn)生的離心力、陀螺力矩及其內(nèi)部運(yùn)動(dòng)時(shí)產(chǎn)生的摩擦力,對(duì)高速時(shí)角接觸球軸承內(nèi)部的動(dòng)力學(xué)狀態(tài)與動(dòng)剛度進(jìn)行分析計(jì)算。 利用角接觸球軸承剛度分析的結(jié)果,在有限元軟件ANSYS中建立電主軸球軸承—轉(zhuǎn)子系統(tǒng)的參數(shù)化有限元模型,并以提高電主軸靜剛度為優(yōu)化目標(biāo),對(duì)電主軸支承跨距和電機(jī)安裝位置進(jìn)行優(yōu)化分析計(jì)算,使電主軸的靜剛度提高了7.81%,并對(duì)優(yōu)化前后的電主軸系統(tǒng)進(jìn)行模態(tài)分析,發(fā)現(xiàn)其頻率增大,其中一階固有頻率增大了1.93%。最后對(duì)電主軸進(jìn)行三維模態(tài)分析,更直觀的展現(xiàn)電主軸的前五階振型。
[Abstract]:Motorized spindle technology is developed with the development and demand of modern manufacturing technology such as high-speed grinding and high-speed CNC machining center. With the increasing speed and power of motorized spindle, the application of high-speed motorized spindle is becoming more and more extensive. The working speed of the high speed motorized spindle is usually close to the first order critical speed of the rotor system. Therefore, it is necessary to analyze and calculate the dynamic performance of the motorized spindle, such as its structure, natural frequency and critical speed. Based on the basic theory and method of ball bearing analysis and calculation, the static and dynamic state of angular contact ball bearing and the calculation of static and dynamic stiffness are analyzed in this paper. The finite element analysis software ANSYS is used to establish the parameterized finite element model of the motorized spindle ball bearing rotor system. With the aim of improving the static stiffness of the motorized spindle, the structure of the motorized spindle is optimized and analyzed so as to make the motorized spindle structure more compact. The natural frequency and critical speed are higher, and the vibration characteristics are better, especially in the critical speed. The main work of this paper is as follows: based on Hertz's elastic contact theory, the geometric relationship, contact stress deformation and load distribution of ball bearings are introduced. The static stiffness of angular contact ball bearing is obtained by analyzing its deformation under radial, axial preloading and combined loads. The centrifugal force, the gyroscopic moment and the internal friction produced by the angular contact ball bearing are further considered. The dynamic state and dynamic stiffness of the angular contact ball bearing at high speed are analyzed and calculated. Based on the results of stiffness analysis of angular contact ball bearings, the parametric finite element model of motor spindle ball bearing-rotor system is established in the finite element software ANSYS, and the optimization goal is to improve the static stiffness of motor spindle. The optimum analysis and calculation of the span of the motorized spindle and the installation position of the motor make the static stiffness of the motorized spindle increase by 7.81%. The modal analysis of the motorized spindle system before and after optimization shows that the frequency increases, and the first natural frequency increases by 1.93%. Finally, the three-dimensional modal analysis of the motorized spindle is carried out to show the first five modes of the motorized spindle more intuitively.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH133.3

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊帆;;一種電主軸四軸聯(lián)動(dòng)鉆床的研制方法[J];裝備制造技術(shù);2013年05期

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本文編號(hào)：2086834