本文選題：軸套　切入點：螺旋溝槽　出處：《安徽工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：在實際生產(chǎn)中,帶鋼連續(xù)熱鍍鋁鋅線鋅鍋內輥子滑動軸承在含有鋅渣的鋅液中的嚴重磨損是造成輥子頻繁失效的主要原因之一。利用表面織構技術在軸套外圓柱面開螺旋溝槽,試驗研究開槽軸套的摩擦磨損性能。主要內容如下。(一)開槽影響分析。對軸套外圓柱面進行表面開槽設計。確定螺旋槽的螺距、槽數(shù)及截面形狀和尺寸。針對生產(chǎn)線實際工況,對開槽軸套進行接觸強度計算,發(fā)現(xiàn)開槽對軸套強度的影響可以忽略。對軸承間隙內的鋅液流場進行仿真,在螺距為160的范圍內,發(fā)現(xiàn)軸承縫隙內鋅液的軸向流量隨螺距的增大而基本成線性地增長。軸承間隙內軸向流量越大,排渣能力越強。(二)試驗機改造。在確認軸套表面開槽對接觸強度影響不大且有利于排渣的基礎上,為試驗研究開槽軸套的摩擦磨損性能,對實驗室現(xiàn)有的直線往復式摩擦磨損試驗機進行改造。在保留原試驗機加載機構和摩擦力與正壓力測試系統(tǒng)的前提下,設計了一個可拆卸的附加機械裝置。固定該裝置于原試驗機的往復移動承載平臺,就實現(xiàn)了旋轉對磨運動方式,得到了一臺旋轉式摩擦磨損試驗機。對新試驗機的性能進行了試驗驗證,并確定了試驗規(guī)程和數(shù)據(jù)處理方法。改造后的試驗機不僅能模擬不同材料、不同表面結構的環(huán)-塊、環(huán)-環(huán)等旋轉摩擦磨損過程,還能進行不同接觸形式以及潤滑狀態(tài)下的旋轉摩擦磨損試驗研究。(三)開槽軸套的摩擦磨損性能的試驗研究。以實際軸套、襯套為背景,設計旋轉對磨試驗的上、下試件。分別設計了7種不同螺距(包括無槽)的下試件,每種試件各加工了6個。模仿實際生產(chǎn)中工況參數(shù)(載荷、轉速)臺階式變化的規(guī)律,設計了兩條工況變化路徑來組織試驗(常溫、滴油潤滑)。路徑一保持轉速不變,分別讓同一試件經(jīng)歷臺階式載荷變化。路徑二載荷不變,分別讓同一試件經(jīng)歷臺階式轉速變化。試驗結果表明:開槽確有利于減摩降磨:(1)轉速不變,108N及132N載荷臺階上,螺距為160的開槽軸套平均摩擦系數(shù)降幅最大,分別為13.3%、22.4%,磨損量降幅也最大且分別為41.4%、54.1%;而84N載荷臺階上,螺距為144的摩擦系數(shù)和磨損量降幅最大,分別為31.6%、46.7%。(2)載荷不變,130rpm速度臺階上,螺距為160的開槽軸套平均摩擦系數(shù)和磨損量降幅最大,分別為22.4%、33.9%;,160rpm速度臺階上,螺距為144的開槽軸套平均摩擦系數(shù)和磨損量降幅最大,分別為34.8%、39.9%�？傮w而言,螺旋溝槽結構能夠明顯改善摩擦副的摩擦磨損性能,并且螺距為160或144軸套減摩降磨性能較好。
[Abstract]:In actual production, the serious wear of roller sliding bearing in zinc bath containing zinc slag is one of the main reasons for frequent failure of roller. Surface texture technique is used to open spiral groove on the outer cylindrical surface of the sleeve. The main contents are as follows: (1) Analysis of the effect of grooving. The surface grooving design of the outer cylindrical surface of the sleeve is carried out. The pitch of the spiral groove is determined. According to the actual working conditions of the production line, the contact strength of the slotted sleeve is calculated, and the influence of grooving on the strength of the shaft sleeve is found to be negligible. The zinc liquid flow field in the bearing clearance is simulated. In the range of 160 pitch, it is found that the axial flow rate of zinc liquid increases linearly with the increase of pitch. On the basis of confirming that the slotting on the surface of the shaft sleeve has little effect on contact strength and is beneficial to slag discharge, the friction and wear properties of the slotted sleeve are studied in order to test and study the friction and wear properties of the slotted sleeve. The existing linear reciprocating friction and wear testing machine in the laboratory is reformed. Under the premise of retaining the loading mechanism of the original testing machine and the testing system of friction force and positive pressure, A detachable additional mechanical device is designed. When the device is fixed on the reciprocating moving bearing platform of the original testing machine, the mode of rotating and grinding motion is realized. A rotary friction and wear testing machine is obtained. The performance of the new testing machine is tested, and the test rules and data processing methods are determined. The modified testing machine can not only simulate the ring blocks with different materials and different surface structures, The rotating friction and wear process such as ring and ring can also be used to study the friction and wear performance of the slotted sleeve under different contact forms and lubricating conditions. (3) the friction and wear performance of the slotted shaft sleeve is studied in the background of the actual sleeve and bushing. Design the upper and lower test pieces of rotary grinding test. Seven different pitch (including slotted) subspecimens are designed respectively, each sample is processed 6 times. It imitates the law of step change of operating condition parameters (load, rotational speed) in actual production. Two operating condition change paths are designed to organize the test (room temperature, oil droplet lubrication). The path one keeps the rotation speed constant, and the same specimen is subjected to step load change respectively. The second path load is invariant. The results show that grooving is beneficial to reducing friction and reducing wear.) rotation speed is invariant at 108N and 132N load steps, and the average friction coefficient of slotted sleeve with 160 pitch is the largest. On the 84N load step, the friction coefficient and wear quantity of the pitch 144 were the largest, 31.60.46.7. 2) the load did not change on the speed step of 130rpm, while on the 84N load step, the friction coefficient and the wear amount decreased the most, respectively, by 13.3% and 54.1% respectively. The average friction coefficient and wear quantity of slotted sleeve with 160 pitch are the largest, which are 22.4% and 33.9% respectively on the speed step of 160rpm. The average friction coefficient and wear quantity of slotted sleeve with 144 pitch are the largest, which are 39.8% and 39.9%, respectively. The friction and wear properties of the friction pairs can be improved obviously by the spiral groove structure, and the friction and wear reduction performance of the pitch 160 or 144 axle bushing is better.
【學位授予單位】：安徽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH117.1

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