發(fā)布時(shí)間：2018-04-11 03:34

  本文選題：接觸力學(xué) + 凸度設(shè)計(jì)��； 參考：《北京化工大學(xué)》2011年碩士論文

【摘要】：要加快我國(guó)石油天然氣的勘探開(kāi)發(fā)速度,提高鉆井工程技術(shù)的國(guó)際競(jìng)爭(zhēng)能力,提高鉆頭尤其是牙輪鉆頭的工作性能和工作壽命十分重要�，F(xiàn)階段應(yīng)綜合應(yīng)用接觸力學(xué)、潤(rùn)滑理論等學(xué)科的知識(shí),對(duì)滾子凸度設(shè)計(jì)、空心圓柱滾子及其潤(rùn)滑狀態(tài)等關(guān)鍵問(wèn)題進(jìn)行深入研究,進(jìn)而研制開(kāi)發(fā)長(zhǎng)壽命、高轉(zhuǎn)速的滾動(dòng)軸承牙輪鉆頭。 本文首先針對(duì)Hertz點(diǎn)接觸問(wèn)題的求解方法進(jìn)行了研究,得到了關(guān)于點(diǎn)接觸問(wèn)題精確高效的完全數(shù)值算法；從計(jì)算速度、計(jì)算精度和計(jì)算方便性等方面對(duì)幾種典型算法進(jìn)行了對(duì)比研究,得出了各算法在不同條件下的適用情況；并將完全數(shù)值算法應(yīng)用于牙輪鉆頭滾動(dòng)軸承中的全圓弧凸型滾子,分析了其接觸參數(shù)在不同條件下的變化。然后,采用MSC.Marc有限元軟件對(duì)迄今常見(jiàn)代表性凸型滾子的應(yīng)力分布規(guī)律和特點(diǎn)進(jìn)行了分析,提出采用多段變曲率圓弧組合替代Lundberg理論對(duì)數(shù)凸型的工程化模擬技術(shù),給出了較為合理的圓弧組合數(shù)目；分析了空心圓柱滾子及其進(jìn)行凹端處理后的應(yīng)力分布規(guī)律。結(jié)果表明,合理的空心度可減小接觸應(yīng)力的邊緣效應(yīng),但等效應(yīng)力在滾子兩端的應(yīng)力集中始終存在；在相同空心度下,等效應(yīng)力和接觸應(yīng)力隨載荷的變化規(guī)律不同；且不同載荷作用下,最佳空心度的理論值不同；空心度較大時(shí),滾子內(nèi)壁等效應(yīng)力會(huì)超過(guò)外壁成為危險(xiǎn)區(qū)域,同時(shí)應(yīng)考慮彎曲應(yīng)力的影響,避免滾子內(nèi)壁發(fā)生彎曲疲勞斷裂；較之普通空心滾子,凹端空心圓柱滾子有效克服了滾子端部的應(yīng)力集中現(xiàn)象。最后,采用多重網(wǎng)格法對(duì)牙輪鉆頭實(shí)心圓柱滾子和空心圓柱滾子的彈流潤(rùn)滑情況進(jìn)行了分析,通過(guò)對(duì)無(wú)限長(zhǎng)滾子線(xiàn)接觸彈流潤(rùn)滑問(wèn)題的研究,揭示了實(shí)心圓柱滾子油膜壓力和膜厚隨載荷參數(shù)、速度參數(shù)和材料參數(shù)的變化規(guī)律；空心圓柱滾子空心度的變化會(huì)引起速度參數(shù)和載荷參數(shù)的變化,但并沒(méi)有引起接觸區(qū)域中部油膜厚度以及最小膜厚的明顯變化；空心度的增加可以降低油膜壓力,但合理空心度的選取應(yīng)考慮其對(duì)滾子內(nèi)壁應(yīng)力分布的影響。有限長(zhǎng)線(xiàn)接觸彈流潤(rùn)滑中最大油膜壓力和最小膜厚都位于滾子端部,故滾子端部為易破壞部位；滾子中部潤(rùn)滑狀況與無(wú)限長(zhǎng)滾子幾乎一致,可按無(wú)限長(zhǎng)處理；空心度對(duì)滾子端部潤(rùn)滑情況的影響與中部相同,由于端部油膜壓力大于中部,故二次峰值和最小油膜厚度較之中部都更靠近出口區(qū)。 本文的研究成果為國(guó)內(nèi)自主實(shí)現(xiàn)滾動(dòng)軸承牙輪鉆頭的長(zhǎng)壽命和高轉(zhuǎn)速化,乃至為工程實(shí)際中廣泛存在的重載低速滾子軸承系統(tǒng)工作性能的提高奠定了堅(jiān)實(shí)基礎(chǔ),同時(shí)也值得標(biāo)準(zhǔn)或通用滾子軸承、鐵路機(jī)車(chē)、冶金軋機(jī)等行業(yè)的研究人員借鑒。
[Abstract]:It is very important to speed up the exploration and development of petroleum and natural gas in China, to improve the international competitiveness of drilling engineering technology, and to improve the working performance and service life of bit, especially the cone bit.At this stage, the key problems such as roller crown design, hollow cylindrical roller and its lubrication state should be thoroughly studied by applying the knowledge of contact mechanics, lubrication theory and so on, and the long life of the roller should be researched and developed.High speed roller bit for rolling bearing.In this paper, the method of solving the point contact problem of Hertz is studied, and the exact and efficient complete numerical algorithm for the point contact problem is obtained.Several typical algorithms are compared and studied in terms of calculation accuracy and calculation convenience, and the application of each algorithm under different conditions is obtained, and the complete numerical algorithm is applied to the full arc convex roller in roller bearing of cone bit.The change of contact parameters under different conditions was analyzed.Then, the stress distribution law and characteristics of typical convex roller are analyzed by using MSC.Marc finite element software, and the engineering simulation technology is put forward to replace the logarithmic convex type of Lundberg theory with multi-segment variable curvature circular arc combination.A reasonable number of arc combinations is given and the stress distribution of hollow cylindrical rollers and their concave ends are analyzed.The results show that reasonable hollow degree can reduce the edge effect of contact stress, but the stress concentration of equivalent stress always exists at both ends of roller, and under the same hollow degree, the variation law of equivalent stress and contact stress with load is different.Under different loads, the theoretical values of the optimum hollow degree are different. When the hollow degree is large, the equivalent stress of the inner wall of the roller will exceed the outer wall and become a dangerous area. At the same time, the influence of bending stress should be considered to avoid the bending fatigue fracture of the inner wall of the roller.Compared with common hollow roller, hollow cylindrical roller at concave end overcomes the stress concentration phenomenon at the end of roller effectively.Finally, the elastohydrodynamic lubrication of solid cylindrical roller and hollow cylindrical roller of cone bit is analyzed by using multi-mesh method.The variation of oil film pressure and film thickness with load parameter, velocity parameter and material parameter are revealed, the change of hollow degree of hollow cylinder roller will cause the change of velocity parameter and load parameter.However, the oil film thickness and the minimum film thickness in the middle of the contact area are not changed obviously, and the increase of the hollow degree can reduce the oil film pressure, but the reasonable selection of the hollow degree should consider its influence on the stress distribution of the inner wall of the roller.The maximum oil film pressure and the minimum film thickness are located at the end of the roller, so the tip of the roller is easily destroyed, and the lubrication condition of the middle part of the roller is almost the same as that of the infinite length roller, which can be treated as infinite length.The effect of the hollow degree on the lubrication of the end part of the roller is the same as that of the middle part. Because the oil film pressure at the end part is larger than that in the middle part, the secondary peak value and the minimum oil film thickness are both closer to the outlet region than the middle part.The research results of this paper have laid a solid foundation for the independent realization of long life and high speed of roller bit in China, and even for the improvement of the working performance of heavy load low speed roller bearing system, which is widely existed in engineering practice.At the same time, it is also worth standard or universal roller bearings, railway locomotives, metallurgical mills and other industries for reference.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH133.33

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