表面开槽轴套—衬套摩擦副的摩擦磨损特性研究

发布时间：2018-03-13 00:17

本文选题：轴套　切入点：螺旋沟槽　出处：《安徽工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：在实际生产中,带钢连续热镀铝锌线锌锅内辊子滑动轴承在含有锌渣的锌液中的严重磨损是造成辊子频繁失效的主要原因之一。利用表面织构技术在轴套外圆柱面开螺旋沟槽,试验研究开槽轴套的摩擦磨损性能。主要内容如下。(一)开槽影响分析。对轴套外圆柱面进行表面开槽设计。确定螺旋槽的螺距、槽数及截面形状和尺寸。针对生产线实际工况,对开槽轴套进行接触强度计算,发现开槽对轴套强度的影响可以忽略。对轴承间隙内的锌液流场进行仿真,在螺距为160的范围内,发现轴承缝隙内锌液的轴向流量随螺距的增大而基本成线性地增长。轴承间隙内轴向流量越大,排渣能力越强。(二)试验机改造。在确认轴套表面开槽对接触强度影响不大且有利于排渣的基础上,为试验研究开槽轴套的摩擦磨损性能,对实验室现有的直线往复式摩擦磨损试验机进行改造。在保留原试验机加载机构和摩擦力与正压力测试系统的前提下,设计了一个可拆卸的附加机械装置。固定该装置于原试验机的往复移动承载平台,就实现了旋转对磨运动方式,得到了一台旋转式摩擦磨损试验机。对新试验机的性能进行了试验验证,并确定了试验规程和数据处理方法。改造后的试验机不仅能模拟不同材料、不同表面结构的环-块、环-环等旋转摩擦磨损过程,还能进行不同接触形式以及润滑状态下的旋转摩擦磨损试验研究。(三)开槽轴套的摩擦磨损性能的试验研究。以实际轴套、衬套为背景,设计旋转对磨试验的上、下试件。分别设计了7种不同螺距(包括无槽)的下试件,每种试件各加工了6个。模仿实际生产中工况参数(载荷、转速)台阶式变化的规律,设计了两条工况变化路径来组织试验(常温、滴油润滑)。路径一保持转速不变,分别让同一试件经历台阶式载荷变化。路径二载荷不变,分别让同一试件经历台阶式转速变化。试验结果表明:开槽确有利于减摩降磨:(1)转速不变,108N及132N载荷台阶上,螺距为160的开槽轴套平均摩擦系数降幅最大,分别为13.3%、22.4%,磨损量降幅也最大且分别为41.4%、54.1%;而84N载荷台阶上,螺距为144的摩擦系数和磨损量降幅最大,分别为31.6%、46.7%。(2)载荷不变,130rpm速度台阶上,螺距为160的开槽轴套平均摩擦系数和磨损量降幅最大,分别为22.4%、33.9%;,160rpm速度台阶上,螺距为144的开槽轴套平均摩擦系数和磨损量降幅最大,分别为34.8%、39.9%。总体而言,螺旋沟槽结构能够明显改善摩擦副的摩擦磨损性能,并且螺距为160或144轴套减摩降磨性能较好。
[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.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117.1

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