本文選題：滾珠旋壓 + 擬動力學(xué)��； 參考：《太原科技大學(xué)》2017年碩士論文

【摘要】：高速滾珠旋壓是一種采用滾珠作為變形工具的強(qiáng)力旋壓加工工藝,綜合了鍛造、擠壓、拉伸、彎曲、環(huán)軋、橫軋和滾壓等工藝的優(yōu)點(diǎn)。由于作為變形工具的滾珠具有很好的表面粗糙度和尺寸精度,使得其加工產(chǎn)品能夠達(dá)到很高的精度。同時(shí),旋壓過程中坯料的變形方式為局部逐點(diǎn)成型,具有其變形區(qū)域小,變形應(yīng)力高的特點(diǎn),通常用來加工一些,高硬度,塑性指標(biāo)差的金屬材料。本文對高速滾珠旋壓過程中的力學(xué)、運(yùn)動學(xué)特性及工藝參數(shù)配置等進(jìn)行了研究,主要研究內(nèi)容和結(jié)果如下:1)以高速滾珠為研究對象,在大量實(shí)驗(yàn)基礎(chǔ)上提出旋壓過程中滾珠的運(yùn)動假設(shè),通過對滾珠進(jìn)行運(yùn)動學(xué)與力學(xué)分析,考慮滾珠所受離心力與陀螺力矩建立了滾珠旋壓的擬動力學(xué)模型�；赩C++平臺編程求解此擬動力學(xué)模型,求解了不同工況下,滾珠的運(yùn)動參數(shù),及三點(diǎn)接觸滾珠在的各接觸點(diǎn)的力學(xué)參數(shù)。由于高速回轉(zhuǎn)體其參數(shù)不易測試,本文利用ABQUS軟件對旋壓過程進(jìn)行了動力學(xué)仿真,提取計(jì)算結(jié)果與理論計(jì)算結(jié)果對比,并間接的進(jìn)行了實(shí)驗(yàn)驗(yàn)證。完善了高速滾珠旋壓分析理論,為滾珠旋壓的生產(chǎn)工藝提供了理論支撐。為進(jìn)一步研究旋壓過程中滾珠變形、模具變形所導(dǎo)致的管材精度偏差及其控制、摩擦生熱控制等提供了理論基礎(chǔ)。2)以管坯為研究對象,基于大量仿真實(shí)驗(yàn)結(jié)果,探討了減薄量、進(jìn)給比、滾珠直徑三個(gè)主要工藝參數(shù)及其相互之間的耦合作用對管坯變形影響區(qū)內(nèi)平均應(yīng)力三軸度的影響;并對這四者之間的關(guān)系進(jìn)行了多元非線性函數(shù)關(guān)系擬合,從而計(jì)算出最小應(yīng)力三軸度對應(yīng)的最優(yōu)工藝參數(shù)。不同工藝參數(shù)配置下的鎂合金薄壁管室溫滾珠旋壓實(shí)驗(yàn)結(jié)果表明:采用本文給出的最優(yōu)工藝參數(shù),可以使旋壓后的管件表面開裂現(xiàn)象得到明顯改善,鎂合金管坯的滾珠旋壓塑性成型性能得到了提高。研究結(jié)果極大的方便了旋壓生產(chǎn)過程中的工藝參數(shù)選取。3)給出了一種應(yīng)用滾珠旋壓在鋼管內(nèi)壁加工環(huán)狀溝槽的工藝方法�；诳臻g解析理論和徑向螺旋進(jìn)給的假設(shè),給出了滾珠和工件之間徑向和切向接觸面積邊界曲線的簡化表達(dá)式,通過曲線積分,得出了用于計(jì)算旋壓力的徑向和切向接觸面積的計(jì)算模型。通過算例得出的數(shù)據(jù),研究了旋壓深度、滾珠直徑、旋壓進(jìn)給量和旋壓力的關(guān)系,由本文給出的解析模型得到的計(jì)算數(shù)據(jù)和有限元模擬所得數(shù)據(jù)的比較,證明了本文所得出的解析模型具有可行性。4)以目前的立式低速旋壓機(jī)床為參考,設(shè)計(jì)以高速電主軸驅(qū)動的高速滾珠旋壓實(shí)驗(yàn)機(jī),并給出高速旋壓時(shí)管坯偏心徑向受力不均導(dǎo)致振動的解決方案。以及在高速與重載之間切換拓展實(shí)驗(yàn)機(jī)旋壓能力的實(shí)現(xiàn)方法。
[Abstract]:High speed ball spinning is a kind of strong spinning process which adopts ball as a deformation tool. It integrates the advantages of forging, extrusion, stretching, bending, ring rolling, cross rolling and rolling. Due to the good surface roughness and dimensional accuracy of the ball as a deformation tool, the product can achieve high precision. At the same time, the deformation mode of billet in spinning process is local point-by-point forming, which has the characteristics of small deformation area and high deformation stress. It is usually used to process some metal materials with high hardness and poor plasticity index. In this paper, the mechanical, kinematic and technological parameters of high speed ball spinning are studied. The main contents and results are as follows: 1) High speed ball is taken as the object of study. On the basis of a large number of experiments, the motion hypothesis of the ball during spinning is put forward. By analyzing the kinematics and mechanics of the ball, the quasi-dynamic model of the ball spinning is established considering the centrifugal force and the gyroscopic moment of the ball. Based on VC platform, the kinematic parameters of ball and the mechanical parameters of three point contact ball at various contact points are solved by programming the pseudo-dynamic model. Because the parameters of high-speed rotary body are not easy to test, the dynamic simulation of spinning process is carried out by using ABQUS software. The results of extraction and calculation are compared with those of theoretical calculation, and the experimental results are indirectly verified. The theory of high-speed ball spinning analysis is perfected, which provides theoretical support for the production process of ball spinning. In order to further study the tube precision deviation and its control caused by ball deformation and die deformation during spinning, and the control of friction heat generation, etc., this paper provides a theoretical basis for the study of tube billet. Based on a large number of simulation results, the thinning amount is discussed. The effect of feed ratio, ball diameter and their coupling on the average stress triaxiality in the zone affected by tube billet deformation is studied, and the multivariate nonlinear function is used to fit the relationship between the four parameters. The optimum process parameters corresponding to the minimum stress triaxiality are calculated. The experimental results of room temperature ball spinning of magnesium alloy thin-walled tubes with different processing parameters show that the surface cracking of tube fittings after spinning can be improved obviously by using the optimum process parameters given in this paper. The spinning plastic forming property of magnesium alloy tube billet was improved. The research results greatly facilitate the selection of process parameters in spinning process. 3) A new method for machining annular grooves with ball spinning on the inner wall of steel pipe is presented. Based on the spatial analytic theory and the assumption of radial spiral feed, a simplified expression of radial and tangential contact area boundary curve between ball and workpiece is given. A model for calculating radial and tangential contact area of rotary pressure is obtained. The relationship among spinning depth, ball diameter, feed rate and pressure is studied by the example. The comparison between the calculated data obtained from the analytical model presented in this paper and the data obtained by finite element simulation is made. It is proved that the analytical model obtained in this paper is feasible. (4) based on the present vertical low speed spinning machine, a high speed ball spinning experiment machine driven by high speed motorized spindle is designed. The solution of vibration caused by eccentric radial force of tube billet under high speed spinning is given. And the realization of switching between high speed and heavy load to expand the spinning capacity of the experimental machine.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG306

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