本文選題：變導(dǎo)程 + 螺旋傳動　； 參考：《南京理工大學(xué)》2015年博士論文

【摘要】：隨著機械制造行業(yè)的快速發(fā)展,變導(dǎo)程螺旋傳動作為新興的傳動方式被提出。實現(xiàn)變導(dǎo)程的機構(gòu)有多種形式,如圓柱凸輪,變導(dǎo)程蝸輪蝸桿等。對于圓柱凸輪,傳動件在凸輪槽內(nèi)做圓周循環(huán)運動,而對于變導(dǎo)程蝸輪蝸桿,蝸桿只能相對于蝸輪短距離的位移變化。本文對變導(dǎo)程傳動機構(gòu)進行結(jié)構(gòu)分析,提出變導(dǎo)程螺旋傳動機構(gòu)模型。利用TRIZ技術(shù)創(chuàng)新理論中的分割理論,將滾珠絲桿和圓柱槽凸輪的旋向與導(dǎo)程屬性提煉出來并加以組合,得到變導(dǎo)程螺旋傳動機構(gòu)。經(jīng)過機構(gòu)創(chuàng)新,變導(dǎo)程螺旋傳動機構(gòu)比傳統(tǒng)螺旋傳動機構(gòu)具有自適應(yīng)性、自鎖性、可變導(dǎo)程性、流體動力潤滑等新特性。這些功能在實際應(yīng)用場合具有重要意義�？紤]參數(shù)和特性兩方面因素,建立螺旋傳動機構(gòu)的理想度模型,并計算了滑動絲桿、滾動絲桿、變導(dǎo)程絲桿的理想度,量化結(jié)構(gòu)創(chuàng)新的比較方法。建立了變導(dǎo)程變半徑絲桿螺旋槽曲面和通用滾子輪廓曲面的數(shù)學(xué)模型。分析其嚙合特性,建立間隙函數(shù)。在半徑不變條件下,對圓柱面上的變導(dǎo)程螺旋線的幾何特征進行了研究,得到了曲率和撓率的表達式。利用圓弧過渡和多項式過渡方式,對圓柱面上螺旋線進行優(yōu)化設(shè)計。按照極值條件建立過渡曲線泛函,通過變分原理進行求解。針對變導(dǎo)程螺旋傳動機構(gòu)運動學(xué)進行建模,利用坐標(biāo)變換理論,螺旋理論計算了滾子和螺旋槽傳動過程中二者的相對滑動速度以及實現(xiàn)純滾動的條件。通過多目標(biāo)優(yōu)化和模糊理論對廣義滾子運動參數(shù)進行了優(yōu)化設(shè)計,與優(yōu)化前傳動特性進行了比較,并驗證結(jié)果。根據(jù)Hertz彈性接觸理論,提出變導(dǎo)程螺旋副滾動接觸簡化模型,計算三維滾動接觸的應(yīng)力分布�？紤]實際情況和加工條件影響,給出了滾子與螺旋槽之間點接觸和線接觸的幾何條件,并得到了點接觸的結(jié)論。根據(jù)最小油膜厚度與粗糙度的關(guān)系,以及接觸區(qū)域橢圓率,綜合判斷各接觸點處的潤滑狀態(tài)。通過Maple數(shù)學(xué)軟件對接觸過程中最小膜厚進行了仿真,得到最小膜厚在不同導(dǎo)程變化下,隨滾子沿絲桿軸線位移的變化規(guī)律。研究了變導(dǎo)程螺旋副的摩擦磨損機理,分別對滾子和螺旋槽接觸的具體工況進行分析,采用雨流計數(shù)法進行載荷譜的編制。然后利用強大的]HyperMesh前處理軟件和FE-Fatigue疲勞壽命分析軟件聯(lián)合對變導(dǎo)程螺旋副疲勞壽命進行分析。最后研究了各種變導(dǎo)程函數(shù)對螺旋副疲勞壽命的影響。
[Abstract]:With the rapid development of machinery manufacturing industry, variable lead spiral drive is proposed as a new type of transmission. There are many kinds of mechanisms to realize variable lead, such as cylindrical cam, worm gear with variable lead and so on. For cylindrical cam, the transmission moves around the cam groove, but for the variable lead worm gear worm, the worm can only change relative to the short distance displacement of the worm gear. In this paper, the structure of variable lead drive mechanism is analyzed, and the model of variable lead spiral transmission mechanism is proposed. By using the segmentation theory of TRIZ technology innovation theory, the rotation and lead properties of ball wire rod and cylindrical grooved cam are extracted and combined, and the variable lead spiral transmission mechanism is obtained. Through the mechanism innovation, the variable lead spiral transmission mechanism has some new characteristics, such as self-adaptability, self-locking, variable lead, hydrodynamic lubrication and so on. These functions are of great significance in practical applications. Considering the parameters and characteristics, the ideal degree model of helical transmission mechanism is established, and the ideal degree of sliding wire rod, rolling wire rod and variable guide wire rod are calculated, and the comparison method of quantitative structure innovation is also given. The mathematical models of the helical groove surface and the general roller profile surface of the wire rod with variable lead and radius are established. The meshing characteristic is analyzed and the gap function is established. Under the condition of invariant radius, the geometric characteristics of the helix with variable lead on the cylinder surface are studied, and the expressions of curvature and torsion are obtained. The helix on the cylindrical surface is optimized by using the arc transition and polynomial transition. According to the extremum condition, the transition curve functional is established and solved by variational principle. Based on the kinematics model of variable lead spiral transmission mechanism, the relative sliding velocity of roller and spiral groove transmission and the conditions for pure rolling are calculated by using coordinate transformation theory and spiral theory. The generalized roller motion parameters are optimized by multi-objective optimization and fuzzy theory. The results are compared with those before optimization and the results are verified. According to Hertz's elastic contact theory, a simplified model of rolling contact of variable lead spiral pair is proposed, and the stress distribution of 3D rolling contact is calculated. The geometric conditions of point contact and line contact between roller and spiral groove are given considering the actual situation and the influence of machining conditions, and the conclusion of point contact is obtained. According to the relationship between the minimum oil film thickness and the roughness and the ellipticity of the contact region, the lubrication state at each contact point is comprehensively judged. The minimum film thickness in the contact process was simulated by Maple software. The variation of the minimum film thickness along the axis of the wire rod was obtained with the change of the minimum film thickness under different leads. The friction and wear mechanism of variable lead screw pair was studied. The specific working conditions of roller and spiral groove contact were analyzed and the load spectrum was compiled by rain flow counting method. Then the fatigue life of the variable lead screw pair is analyzed by using the powerful HyperMesh pre-processing software and the FE-Fatigue fatigue life analysis software. Finally, the influence of various variable lead functions on the fatigue life of screw pair is studied.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TH132

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本文編號：1948153