共查询到16条相似文献,搜索用时 109 毫秒
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在MHK-500型环块式磨损试验机上,在L-AN46全损耗系统用油的不同供油温度下,对由45#淬火钢试环、试块组成的滑动摩擦副进行了抗咬死性能试验研究。试验结果表明:供油温度对摩擦副的抗咬死性能有较大的影响。在一定的范围内,提高润滑油的供油温度,有利于提高摩擦副的抗咬死能力。试验还发现:摩擦副失效后表面温度表现出不确定性。润滑油中的磨粒状况对摩擦副咬死影响不可忽视。对摩擦副咬死的研究应考虑润滑油中磨粒随时间改变的因素,基于时变的观点来研究摩擦副咬死机理更具有实际意义。 相似文献
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供油温度对45^#淬火钢滑动摩擦副咬死影响的设计研究 总被引:1,自引:0,他引:1
在MHK-500型环块式磨损试验机上,在L-AN46全损耗系统用油的不同供油温度下,对由45^#淬火钢试环、试块组成的滑动摩擦副进行了抗咬死性能试验研究。试验结果表明:供油温度对摩擦副的抗咬死性能有较大的影响。在一定的范围内,提高润滑油的供油温度,有利于提高摩擦副的抗咬死能力。试验还发现:摩擦副失效后表面温度表现出不确定性。润滑油中的磨粒状况对摩擦副咬死影响不可忽视。对摩擦副咬死的研究应考虑润滑油 相似文献
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润滑油中磨屑尺寸对滑动摩擦副咬死性能影响的试验研究 总被引:1,自引:0,他引:1
在MHK-500型环块式磨损试验机上,对含不同尺寸磨屑润滑油润滑的45^#淬火屑试环,试块组成的滑动摩擦副进行了抗咬死性能试验研究,试验结果表明,润滑油中磨屑尺寸对滑劝摩擦副抗咬伤性能有很大的影响,改善润滑油清洁度的显著提高摩擦副的抗咬死承载能力,滑动摩擦副的抗咬死能力随润滑油中磨屑含量的增中减小很快,观察咬死后试件上的磨痕,表明滑动摩擦副的咬死是由于局部高温引起的接触区熔焊所致。 相似文献
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45^#钢滑动摩擦副咬死温度变化特征的试验研究 总被引:2,自引:0,他引:2
温度变化是摩擦副胶合前期重要特征之一。在MHK-500型块式磨损试验上,采用热电偶测温技术,对45^#淬火钢和钢试环、试声滑动摩擦副咬死过程的温度变化特征进行了试验研究。试验结果表明:胶合瞬间,摩擦副表面温度发生了突变,胶合发生后,摩擦副是否发生咬死受材料高温下机械特性以及润滑方式等因素的影响。磨擦副表面微凸峰之间以及润滑油中磨屑与摩擦副表面间的微切削作用是导致磨擦副表面温度突变的原因之一。 相似文献
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滑动摩擦副抗咬死性能的试验研究 总被引:1,自引:0,他引:1
咬死是高速,重载滑动摩擦副常见的失效形式之一。在MHK-500型块磨损试验机上对45^#淬火,45^#调质,GCr15,ZQAL9-4材质组成的滑动摩擦副进行了抗咬死性能试验研究。试验结果表明;构成摩擦副材料的粗糙度,相对滑动速度,不同材质摩擦副对摩擦副抗咬死能力有一定的影响,改变摩擦副材质性能提高摩擦副抗咬死能力; 相似文献
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硼酸镧纳米添加剂对摩擦副抗咬死性能影响的研究 总被引:1,自引:0,他引:1
通过对含硼酸镧纳米粒子添加剂润滑油的抗咬死性能试验研究发现 ,硼酸镧纳米添加剂能改善滑动摩擦副的抗咬死性能及润滑油的润滑性能 ,通过分析咬死失效后的表面形貌 ,结合咬死失效前后滑动摩擦副表面XPS图谱 ,分析了硼酸镧纳米添加剂提高滑动摩擦副抗咬死性能的原因 相似文献
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含磨屑油润滑的滑动摩擦副咬死失效理论模型及验证 总被引:3,自引:0,他引:3
提出了含磨屑油润滑时,线接触滑动摩擦副咬死失效理论模型;该模型是基于接触区最高温度达到材料的熔焊温度引起接触区局部熔焊而发生咬死失效观点建立的。并从理论上计算了含不同尺寸磨屑润滑油润滑时咬死极限载荷在 M H K500 型环块式磨损试验机上,通过对含不同尺寸磨屑润滑油润滑的滑动摩擦副咬死极限载荷的对比试验,部分验证了本文所提出的咬死失效理论模型的正确性;在此基础上,提出了预防咬死发生的措施。 相似文献
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纳米硼酸镧添加剂的摩擦学性能研究 总被引:5,自引:0,他引:5
通过对含纳米硼酸镧粒子添加剂润滑油的摩擦学性能试验研究 ,发现纳米硼酸镧添加剂能改善滑动摩擦副的摩擦学性能、抗胶合能力及润滑油的润滑性能 ,分析滑动摩擦副胶合失效后的表面形貌 ,结合失效后滑动摩擦副表面 XPS图谱 ,发现这是由于这种添加剂能在摩擦副表面形成吸附膜及聚合物膜 ,且摩擦副表面有渗硼层出现所致 相似文献
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This paper summarizes the results of scuffing tests performed on AMS 6260 steel disks, covering three oils (a MIL-L-7808G oil, a MIL-L-23699A oil, and a straight mineral oil), two oil supply temperatures, a variety of sliding and sum velocities, and two modes of operating the test disks such that the potential failure sites on the disk surfaces either do or do not synchronize precisely in repeated cycles of operation. It is shown that, under otherwise comparable situations, (a) different oil-steel combinations allow the operation to penetrate by different degrees into the boundary lubrication regime before scuffing occurs, (b) an increase in the sliding velocity, at constant sum velocity, decreases the scuff failure load and the critical temperature, (c) an increase in the sum velocity, at constant sliding velocity, increases the scuff failure load and the critical temperature, (d) the effect of changing the sliding velocity or sum velocity, at a constant sliding-to-sum velocity ratio, depends on the balance of the opposing effects of sliding ans sum velocities at the particualar velocity ratio of interest, and (e) the scuff failure load and the critical temperature are markedly increased when the potential failure sites on the disk surfaces do not precisely synchronize on repeated cycles of operation.It is further demonstrated that the variations of the oil film thickness at scuffing, the coefficient of friction at scuffing, and the critical temperature with respect to all surface and operating variables correlate satisfactorily with a dimensionless parameter ξf. 相似文献
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G. Bollani 《Wear》1976,36(1):19-23
The scuffing behaviour of sliding couples made from 12 NiCr 13 steel, lubricated with SAE 90 and SAE 20 W30 oils with and without additives, was studied as a function of relative sliding speed and bulk oil temperature. It was found that the scuffing load decreases almost inversely with sliding speed. Calculations which take into account the decrease in hardness at increasing temperature show a fairly good constancy of total contact temperature (bulk + flash temperature) at scuffing (i.e. values ranging from 550 ° to 650 °C for all oils and test conditions). At low speeds (up to 1 m s?1) a well-defined increase in scuffing load was found when EP additives were used; at higher speeds this effect was found to have vanished completely. Variations in nominal contact pressure in the range 1 to 3 had no appreciable influence on the scuffing load, indicating that, in the present case, scuffing was associated with a transition from the boundary lubrication regime to the severe wear regime. 相似文献
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为了研究弹性材料表面微织构对摩擦副空化现象和润滑特性的影响,建立考虑空化效应的二维弹性织构计算模型,采用流固耦合方法计算润滑流场与材料变形之间的相互作用。对比刚性材料表面微织构,从弹性模量、滑动速度、微织构深度以及织构间距等方面分析弹性材料表面织构对摩擦副润滑性能的影响,通过实验验证模拟结果的准确性。结果表明:弹性织构摩擦副比刚性织构摩擦副摩擦因数更小,润滑性能更好;存在最优织构深度,使得弹性织构摩擦副的摩擦力最小且承载力最大;适当增大滑动速度以及织构间距可以提高弹性摩擦副的润滑性能;随着弹性模量的降低,弹性变形和油膜厚度增加,空化现象更为显著,摩擦副的润滑性能得到提升。 相似文献
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Friction and scuffing behaviour of grey cast iron as influenced by the surface roughness under sparse lubrication conditions is studied. The studies are carried out on a three-shoe-on-disc machine under the conditions of parallel sliding. The experiments were conducted at three oil supply rates of 0.10, 0.22 and 0.36 μg/cm2 per contact obtained through a mist oiling system and with specimens of cast iron shoes of different roughness values, Ra, between 0.04 and 2.0 μm against a 0.55% C steel disc. In a step load procedure, the friction torque at the end of each load step and the scuffing load are the major parameters measured. Results of friction and scuffing behaviour as a function of roughness and oil supply rates have been discussed. 相似文献