【摘要】：牙輪鉆頭是鉆井領(lǐng)域中最重要的破巖工具之一,它的壽命直接影響著鉆井的效率和成本。眾所周知,牙輪鉆頭軸承失效是影響牙輪鉆頭壽命的最關(guān)鍵因素之一,其主要形式為粘著磨損,而浮動(dòng)套軸承就能改善軸承粘著磨損現(xiàn)象。但是在實(shí)際的工作中,浮動(dòng)套軸線會(huì)發(fā)生偏轉(zhuǎn),這樣就造成了浮動(dòng)套的邊緣發(fā)生應(yīng)力集中現(xiàn)象,降低了浮動(dòng)套軸承的使用壽命。 本文將浮動(dòng)套的外表面設(shè)計(jì)成球面,這樣使浮動(dòng)套在實(shí)際工作中,接觸的表面積增大,降低了接觸應(yīng)力,提高了浮動(dòng)套軸承的壽命,進(jìn)而提高牙輪鉆頭的壽命。論文開(kāi)展的主要工作如下： 1)設(shè)計(jì)了一種球面浮動(dòng)套軸承結(jié)構(gòu),并通過(guò)理論分析和有限元模擬分析,發(fā)現(xiàn)相同條件下球面浮動(dòng)套在應(yīng)力上均小于普通浮動(dòng)套,能夠有效地改善普通浮動(dòng)套的應(yīng)力集中現(xiàn)象； 2)本文選取18CrNiMo7-6鋼作為球面浮動(dòng)套的基體材料,制定了合適的熱處理工藝并對(duì)其進(jìn)行數(shù)值模擬。在經(jīng)過(guò)數(shù)值模擬后,發(fā)現(xiàn)熱處理后的球面浮動(dòng)套提高了耐磨性能和抗沖擊的能力,較好地滿足牙輪鉆頭的實(shí)際工況； 3)為了進(jìn)一步提高球面浮動(dòng)套的摩擦性能,本文將TiN涂層技術(shù)應(yīng)用于牙輪鉆頭軸承系統(tǒng)中。測(cè)試TiN涂層一系列參數(shù),發(fā)現(xiàn)TiN涂層能夠有效地降低摩擦副間的摩擦系數(shù),并且提高其表面硬度,增加了耐磨性能,說(shuō)明TiN涂層技術(shù)能夠有效地提高牙輪鉆頭的壽命。
[Abstract]:Cone bit is one of the most important rock breaking tools in drilling field. Its service life directly affects the efficiency and cost of drilling. It is well known that the failure of roller bit bearing is one of the most important factors affecting the life of cone bit. The main form of bearing is adhesive wear, and floating sleeve bearing can improve the phenomenon of bearing adhesion wear. But in the actual work, the axis of the floating sleeve will deflect, thus causing the stress concentration on the edge of the floating sleeve and reducing the service life of the floating sleeve bearing. In this paper, the outer surface of the floating sleeve is designed as a spherical surface, so that the surface area of the contact is increased, the contact stress is reduced, the life of the floating sleeve bearing is increased, and the life of the cone bit is increased. The main work of this paper is as follows: 1) A spherical floating sleeve bearing structure is designed. Through theoretical analysis and finite element simulation analysis, it is found that the stress of spherical floating sleeve is smaller than that of ordinary floating sleeve under the same conditions. It can effectively improve the stress concentration phenomenon of ordinary floating sleeve. 2) in this paper, 18CrNiMo7-6 steel is chosen as the base material of spherical floating sleeve, and the appropriate heat treatment process is established and numerically simulated. After numerical simulation, it is found that the spherical floating sleeve after heat treatment can improve the wear resistance and impact resistance, and better meet the actual working conditions of the cone bit. 3) in order to improve the friction performance of spherical floating sleeve, TiN coating technology is applied to roller bit bearing system. By testing a series of parameters of TiN coating, it is found that TiN coating can effectively reduce the friction coefficient between friction pairs, improve the surface hardness and increase the wear resistance. It shows that the TiN coating technology can effectively improve the life of cone bit.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE921.1

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本文編號(hào)：2369617