不同工况下蓖麻油的摩擦磨损研究

利用M－200环－块磨损试验机,对9CrSi/H62摩擦副进行摩擦磨试验。研究了蓖麻油为基础润滑油,加硬脂酸锌和梗酯酸钙添加剂后,转速、加油方式、载荷对磨损性能的影响。结果表明：加人添加剂可抗磨,但不一定减摩,抗磨减摩效果与工况条件有关。     

汽车减震器扭转疲劳试验机改进设计

介绍一种新型汽车减震器扭转疲劳试验机的结构和功能，较详细介绍主要结构和单片机测控系统。     

水润滑陶瓷轴承的试验研究

使用Ｓｉａｌｏｎ，ＺｒＯ２和Ａｌ２Ｏ３陶瓷材料，进行了水润滑条件下的滚动轴承和滑动轴承的试验研究，比较和分析了各种陶瓷材料的疲劳和磨损特性，滚动轴承中Ｓｉａｌｏｎ球的寿命最长，Ａｌ２Ｏ３球的寿命最短，滑动轴承试验中Ｓｉａｌｏｎ的摩擦系数最小，而ＺｒＯ２的磨损较大，借助扫描电子显微镜和Ｘ射线能谱分析讨论了陶瓷的疲劳和磨损机理。     

基于ADAMS的硬度检测装置设计

提出了基于虚拟仿真技术的硬度检测台结构优化设计.建立了检测台三维模型,以仿真软件ADAMS为工具从操作方便性、结构合理性、测量正确性及安全性进行分析模型,并建立气动系统进行仿真来得到所需要的动力.仿真结果表明:该硬度检测台具有很好的检测性能,并已经投入实际工作中.     

一种单片机断电保护检测器的研制

本文介绍了一种简单实用的单片机断电保护检测器。文中对其电路原理、结构和特点作了描述。使用实践证明，该断电保护检测器具有电路简单、稳定可靠、实用性强等特点。它具有很高的实用价值。     

Ni－P－Si_3N_4复合镀层中P含量对残余应力和磨损性能的影响

采用Ｘ射线法测量了Ｎｉ－Ｐ－Ｓｉ３Ｎ４复合镀层经热处理后在镀层中产生的残余应力，并与Ｎｉ－Ｐ镀层进行了对比研究。同时，着重分析了镀层残余应力和磨损性能的关系。结果表明，Ｎｉ－Ｐ－Ｓｉ３Ｎ４复合镀层中Ｐ含量较低时为压应力，镀层磨损量较低；Ｐ含量较高时为拉应力，镀层脆性脱落严重，磨损量增大。对于ＮｉＰ镀层，随着镀层中Ｐ含量的增大，拉应力逐渐增大，磨损加剧；而Ｐ含量较低时，表现为粘着磨损。     

Tribological behavior of boundary lubricated sliding surfaces using three different spacing of surface profiles

The ball-on-disk type sliding tests with boundary lubricated steels were carried out to verity the effect of initial spacing in surface profiles on wear and scuffing. Three kinds of surface spacing, which are closely related with initial surface micro-cracks on sliding surfaces, were produced onAISI 1045 steel surfaces using different grinding and polishing processes. Frictional forces and time to scuffing were measured, and the shape and amount of wear particles were analyzed to compare the with original surface profiles. From the tests, it was confirmed that the size of wear particles are related closely to the original spacing of the surface profile. The time to failure and amount of wear were sensitive to the surface spacing. The wider surface spacing shows much longer sliding life and smaller amount of wear than the others. Time to scuffing was increased with increasing surface profile spacing. The size of wear particles increased while the wear and wear rateK were decreased with an increase in surface spacing. After the sliding tests, surface cracks of inner parts of the wear track formed due to scuffing were observed and compared among the specimens having the different surface spacing.     

Fretting behaviour of glass-fibre-reinforced polypropylene composite against 2024 Al alloy

Composite materials, mainly fibre type ones, are used to respond to crucial demands in engineering applications. Various limitations mean that it is usually impossible to produce structures without mechanical joints. Fretting is an important failure mode for such joints, especially for dynamic loads. This paper sets out to assess the influence of this failure mode—fretting—in association with the effect of displacement, surface treatment with aluminium (anodisation) and the effect of environment, temperature and relative humidity. A series of experiments was carried out, changing each of the variables. To analyse the influence of each parameter, tangential force and displacement were used to establish the fretting cycles for every condition tested. Variations in the shape of the cycles revealed three regimes typical of fretting: stick, slip and partial slip, but the most effective way to characterize the transition between regimes was based on energy dissipation by friction. Surface treatment by anodisation leads to lower wear values, for small amplitude displacements, while for higher displacement amplitudes the wear volume was larger, for the case of room temperature and humidity. Increased temperature resulted in a rise in wear volumes, especially for non-anodised aluminium. Variation in humidity did not greatly influence the behaviour of the specimens studied.     

工程陶瓷切削有限元仿真

工程陶瓷已广泛应用到工业领域。作为典型的高硬度脆性材料，其切削复杂，切削过程是一个不连续的过程，而内部微裂纹扩展是导致断裂和产生切屑原因。这里以脆性断裂理论为基础建立适合工程陶瓷车削过程分析的有限元模型：断裂分析模型，采用不连续的模拟方式，对工程陶瓷的不连续切削过程，以及加工表面的破坏状况进行分析。     

车削中心刀具磨破损的监控

论述了用主轴切削电流作为监控参量，采用自学习法对车削中心进行刀具磨破损监控的技术。