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

【摘要】：隨著機(jī)械制造行業(yè)的快速發(fā)展,變導(dǎo)程螺旋傳動(dòng)作為新興的傳動(dòng)方式被提出。實(shí)現(xiàn)變導(dǎo)程的機(jī)構(gòu)有多種形式,如圓柱凸輪,變導(dǎo)程蝸輪蝸桿等。對(duì)于圓柱凸輪,傳動(dòng)件在凸輪槽內(nèi)做圓周循環(huán)運(yùn)動(dòng),而對(duì)于變導(dǎo)程蝸輪蝸桿,蝸桿只能相對(duì)于蝸輪短距離的位移變化。本文對(duì)變導(dǎo)程傳動(dòng)機(jī)構(gòu)進(jìn)行結(jié)構(gòu)分析,提出變導(dǎo)程螺旋傳動(dòng)機(jī)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(dòng)機(jī)構(gòu)。經(jīng)過機(jī)構(gòu)創(chuàng)新,變導(dǎo)程螺旋傳動(dòng)機(jī)構(gòu)比傳統(tǒng)螺旋傳動(dòng)機(jī)構(gòu)具有自適應(yīng)性、自鎖性、可變導(dǎo)程性、流體動(dòng)力潤滑等新特性。這些功能在實(shí)際應(yīng)用場(chǎng)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(dòng)機(jī)構(gòu)的理想度模型,并計(jì)算了滑動(dòng)絲桿、滾動(dòng)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(duì)圓柱面上的變導(dǎo)程螺旋線的幾何特征進(jìn)行了研究,得到了曲率和撓率的表達(dá)式。利用圓弧過渡和多項(xiàng)式過渡方式,對(duì)圓柱面上螺旋線進(jìn)行優(yōu)化設(shè)計(jì)。按照極值條件建立過渡曲線泛函,通過變分原理進(jìn)行求解。針對(duì)變導(dǎo)程螺旋傳動(dòng)機(jī)構(gòu)運(yùn)動(dòng)學(xué)進(jìn)行建模,利用坐標(biāo)變換理論,螺旋理論計(jì)算了滾子和螺旋槽傳動(dòng)過程中二者的相對(duì)滑動(dòng)速度以及實(shí)現(xiàn)純滾動(dòng)的條件。通過多目標(biāo)優(yōu)化和模糊理論對(duì)廣義滾子運(yùn)動(dòng)參數(shù)進(jìn)行了優(yōu)化設(shè)計(jì),與優(yōu)化前傳動(dòng)特性進(jìn)行了比較,并驗(yàn)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(dòng)接觸簡(jiǎn)化模型,計(jì)算三維滾動(dòng)接觸的應(yīng)力分布�？紤]實(shí)際情況和加工條件影響,給出了滾子與螺旋槽之間點(diǎn)接觸和線接觸的幾何條件,并得到了點(diǎn)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(diǎn)處的潤滑狀態(tài)。通過Maple數(shù)學(xué)軟件對(duì)接觸過程中最小膜厚進(jìn)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(jī)理,分別對(duì)滾子和螺旋槽接觸的具體工況進(jìn)行分析,采用雨流計(jì)數(shù)法進(jìn)行載荷譜的編制。然后利用強(qiáng)大的]HyperMesh前處理軟件和FE-Fatigue疲勞壽命分析軟件聯(lián)合對(duì)變導(dǎo)程螺旋副疲勞壽命進(jìn)行分析。最后研究了各種變導(dǎo)程函數(shù)對(duì)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(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH132

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 井衛(wèi)東,李陽星;基于彈流潤滑理論的凸輪設(shè)計(jì)[J];煤礦機(jī)械;2004年08期

2 張焱,孔祥安,金學(xué)松;軌頭內(nèi)彈塑性接觸應(yīng)力場(chǎng)與工況參數(shù)[J];鐵道學(xué)報(bào);1999年05期

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本文編號(hào)：1948153