连杆衬套表面形貌对摩擦磨损特性影响的试验研究
发布时间：2018-09-12 06:54
【摘要】：摩擦副的摩擦特性与其表面形貌密切相关，通过表面形貌的设计改变摩擦特性成为了近些年来科学研究的一个重点。发动机连杆衬套的表面形貌不但对其本身的摩擦特性、磨损特性、成膜效果、耐腐蚀性等有较大的影响，而且与设备整体的运转性能、工作效率、振动与噪声的控制有密切的关系。因此改善表面形貌是延长零件和设备寿命、提升运转性能的一个非常有效的渠道。 为了较好的控制连杆衬套在工况中的摩擦特性，研究人员在连杆衬套材质的研发、润滑等方面做了大量的的研究工作，但是在表面形貌对摩擦磨损特性的影响上分析研究较少，本文就是在保证润滑充分且润滑条件不变的情况下，采用不同材料的连杆衬套研究表面形貌对摩擦特性的影响。 本文主要进行了以下工作： (1)首先对众多表面形貌参数的定义和意义进行了分析研究，从大量的二维表面形貌参数选取部分具有功能特性的有效参数进行分析。基于粗糙峰接触和润滑，从大量的表面形貌参数中选择7个具有功能特性的有效参数进行分析。用JB-5C粗糙度轮廓仪采集连杆衬套表面形貌参数值，同时得出表面形貌图。 (2)对连杆衬套进行了摩擦特性试验，研究了表面形貌参数、速度、载荷、润滑、摩擦距离对摩擦特性的影响，得到了相应的变化规律曲线，得出连杆衬套形貌变化与硬表面活塞销表面形貌有关，，与自身初始形貌无关。 (3)基于BP神经网络MIV法对表面形貌参数进行筛选。众多表面形貌参数对摩擦特性的影响程度不同，研究不同表面形貌参数影响程度的大小至关重要。利用MATLAB中BP神经网络工具箱和MIV参数筛选法，以表面形貌参数对摩擦扭矩的平均影响值作为评价基准进行编程计算，将这些参数按重要程度进行排序，从中选出对摩擦特性影响较大的参数作为表面形貌设计的关键依据，为以后通过改变连杆衬套表面形貌来改善摩擦特性奠定基础。 (4)对不同材料的连杆衬套进行摩擦磨损特性试验。以锡青铜QSn7-0.2、铝青铜QAl9-4-4-2、铅黄铜Hpb59-1、磷青铜QSn10-1四种不同材料的连杆衬套为研究对象进行摩擦磨损特性试验，对四种材料连杆衬套的表面形貌变化、摩擦磨损特性进行了对比分析，通过试验发现锡青铜QSn7-0.2连杆衬套具有较好的减摩耐磨性能。
[Abstract]:The friction characteristics of friction pairs are closely related to their surface morphology. It has become a scientific research focus in recent years to change the friction characteristics through the design of surface morphology. The surface morphology of engine connecting rod bushing not only has great influence on its own friction characteristics, wear characteristics, film forming effect and corrosion resistance, but also has a great effect on the operation performance and working efficiency of the whole equipment. Vibration is closely related to noise control. Therefore, improving the surface morphology is a very effective channel for prolonging the life of parts and equipment and improving the operation performance. In order to better control the friction characteristics of the connecting rod bushing in the working condition, researchers have done a lot of research work in the research and development of the link bushing material, lubrication and so on, but the influence of the surface morphology on the friction and wear characteristics is less studied. In this paper, the influence of surface morphology on friction characteristics is studied by using connecting rod bushing with different materials under the condition of sufficient lubrication and invariable lubrication conditions. The main work of this paper is as follows: (1) firstly, the definition and significance of many surface topography parameters are analyzed and analyzed from a large number of two-dimensional surface topography parameters selected part of the effective parameters with functional characteristics. Based on the contact and lubrication of rough peaks, seven effective parameters with functional characteristics were selected from a large number of surface topography parameters to be analyzed. The surface topography parameters of connecting rod bushing were collected by JB-5C roughness profiler. (2) the friction characteristics of connecting rod bushing were tested, and the parameters of surface topography, speed, load, lubrication were studied. The influence of friction distance on the friction characteristics is obtained, and the corresponding curves are obtained. It is concluded that the change of the shape of the connecting rod bushing is related to the surface morphology of the piston pin on the hard surface. (3) BP neural network MIV method was used to screen the surface morphology parameters. The influence of many surface morphology parameters on the friction characteristics is different, so it is very important to study the influence degree of different surface morphology parameters. By using BP neural network toolbox and MIV parameter screening method in MATLAB, the average influence value of surface topography parameters on friction torque is programmed and calculated, and these parameters are sorted according to the importance degree. The parameters which have a great influence on the friction characteristics are selected as the key basis for the design of the surface topography. It lays a foundation for improving the friction characteristics by changing the surface morphology of the connecting rod bushing. (4) the friction and wear characteristics of the connecting rod bushing with different materials are tested. The friction and wear characteristics of four kinds of connecting rod bushings of tin bronze QSn7-0.2, aluminum bronze QAl9-4-4-2, lead brass Hpb59-1, phosphor bronze QSn10-1 were studied. The surface morphology and friction and wear characteristics of four kinds of materials connecting rod bushing were compared and analyzed. It is found that tin bronze QSn7-0.2 connecting rod bushing has good antifriction and wear resistance.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117.1
本文编号：2238242
[Abstract]:The friction characteristics of friction pairs are closely related to their surface morphology. It has become a scientific research focus in recent years to change the friction characteristics through the design of surface morphology. The surface morphology of engine connecting rod bushing not only has great influence on its own friction characteristics, wear characteristics, film forming effect and corrosion resistance, but also has a great effect on the operation performance and working efficiency of the whole equipment. Vibration is closely related to noise control. Therefore, improving the surface morphology is a very effective channel for prolonging the life of parts and equipment and improving the operation performance. In order to better control the friction characteristics of the connecting rod bushing in the working condition, researchers have done a lot of research work in the research and development of the link bushing material, lubrication and so on, but the influence of the surface morphology on the friction and wear characteristics is less studied. In this paper, the influence of surface morphology on friction characteristics is studied by using connecting rod bushing with different materials under the condition of sufficient lubrication and invariable lubrication conditions. The main work of this paper is as follows: (1) firstly, the definition and significance of many surface topography parameters are analyzed and analyzed from a large number of two-dimensional surface topography parameters selected part of the effective parameters with functional characteristics. Based on the contact and lubrication of rough peaks, seven effective parameters with functional characteristics were selected from a large number of surface topography parameters to be analyzed. The surface topography parameters of connecting rod bushing were collected by JB-5C roughness profiler. (2) the friction characteristics of connecting rod bushing were tested, and the parameters of surface topography, speed, load, lubrication were studied. The influence of friction distance on the friction characteristics is obtained, and the corresponding curves are obtained. It is concluded that the change of the shape of the connecting rod bushing is related to the surface morphology of the piston pin on the hard surface. (3) BP neural network MIV method was used to screen the surface morphology parameters. The influence of many surface morphology parameters on the friction characteristics is different, so it is very important to study the influence degree of different surface morphology parameters. By using BP neural network toolbox and MIV parameter screening method in MATLAB, the average influence value of surface topography parameters on friction torque is programmed and calculated, and these parameters are sorted according to the importance degree. The parameters which have a great influence on the friction characteristics are selected as the key basis for the design of the surface topography. It lays a foundation for improving the friction characteristics by changing the surface morphology of the connecting rod bushing. (4) the friction and wear characteristics of the connecting rod bushing with different materials are tested. The friction and wear characteristics of four kinds of connecting rod bushings of tin bronze QSn7-0.2, aluminum bronze QAl9-4-4-2, lead brass Hpb59-1, phosphor bronze QSn10-1 were studied. The surface morphology and friction and wear characteristics of four kinds of materials connecting rod bushing were compared and analyzed. It is found that tin bronze QSn7-0.2 connecting rod bushing has good antifriction and wear resistance.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117.1
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