【作者】 张宇；

【导师】 冷岳峰；

【作者基本信息】 辽宁工程技术大学 ， 机械工程， 2019， 硕士

【摘要】 磨粒磨损是最常见且最为严重的一种磨损形式。材料在磨粒磨损过程中常常会受到振动的影响,因此研究不同频率的振动对磨粒磨损的影响很有意义。文章以高锰钢材料为具体研究对象,分析了不同的振动频率对高锰钢材料磨粒磨损的影响。本文先用离散元分析软件EDEM仿真不同振动频率下高锰钢试样的法向力、切向力、磨损深度随时间的变化情况;接下来详细介绍了振动松散磨粒磨损试验机的工作原理和各部分的组成结构;然后用制造的振动松散磨粒磨损试验机做了七组不同振动频率的高锰钢磨粒磨损试验,并将试验所得到的数据记录下来;之后用超景深显微镜观察试验后试样表面的磨损形貌;最后分析了振动工况下影响磨粒磨损结果的因素。通过对仿真结果和试验数据进行分析,得到以下结论:振动会加快高锰钢试样的磨粒磨损,并且在相同时间内振动频率越高磨损量越大;试样的磨粒磨损主要是由试样所受的法向力造成的;不同频率的振动下试样都是开始磨损速度快,磨损速度随着时间延长而逐渐变慢;在振动频率6Hz前磨损量随振动频率的增加而近似线性增加,而在振动频率增长到6Hz时,继续增加振动频率,磨损量的增幅逐渐放缓,最后趋于一个定值。通过用超景深显微镜观察高锰钢试样磨损后的形貌,可以得出:不施加振动时的磨粒磨损机理是微切削和塑性变形,随着振动频率的增加,磨粒磨损机理逐渐转变成以塑性变形为主。振动频率继续增加,磨粒磨损机理转变为以塑性变形和疲劳破坏为主。通过对振动工况下影响磨粒磨损结果的因素进行分析,得到:振动是通过影响磨粒的尖锐程度、磨粒硬度、磨粒与试样间的相互作用力、温度等几个因素而对试样的磨粒磨损产生影响。该论文有图34幅,表10个,参考文献57篇。更多还原

【Abstract】 Abrasive wear is the most common and serious form of wear.Vibration often affects abrasive wear of materials,so it is meaningful to study the influence of different frequencies of vibration on abrasive wear.Taking high manganese steel as a specific research object,this paper analyzed the influence of different vibration frequencies on abrasive wear of high manganese steel.In this paper,the normal force,tangential force and wear depth of high manganese steel specimens under different vibration frequencies are simulated by the discrete element analysis software EDEM.Then the working principle and components of the vibration loose abrasive wear tester are introduced in detail.Seven groups of high manganese steel abrasive wear testers with different vibration frequencies are made by the vibration loose abrasive wear tester.Damage test was carried out,and the data obtained from the test were recorded.After that,the wear morphology of the sample surface was observed by the ultra-depth-of-field microscope.Finally,the factors affecting the abrasive wear results under vibration conditions were analyzed.Through the analysis of simulation results and test data,the following conclusions are drawn: vibration will accelerate the abrasive wear of high manganese steel specimens,and the higher the vibration frequency in the same time,the greater the wear amount;the abrasive wear of specimens is mainly caused by the normal force on the specimens;under different frequencies of vibration,the specimens begin to wear fast,and the wear rate gradually increases with time.The wear rate increases linearly with the increase of the vibration frequency before the vibration frequency is 6 Hz,but increases continuously when the vibration frequency increases to 6 Hz.The increase of wear rate slows down gradually,and finally tends to a certain value.The abrasive wear mechanism of high manganese steel without vibration is micro-cutting and plastic deformation.With the increase of vibration frequency,the abrasive wear mechanism gradually changes to plastic deformation.With the increase of vibration frequency,the mechanism of abrasive wear changes to plastic deformation and fatigue failure.Through the analysis of the factors affecting the results of abrasive wear under vibration conditions,it is concluded that vibration affects the abrasive wear of samples through several factors,such as the sharpness of abrasive particles,the hardness of abrasive particles,the interaction force between abrasive particles and samples,and temperature.This paper has 34 figures,10 tables and 57 references.更多还原