内燃机缸套珩磨强化工艺的进展

分析研究了内燃机缸套工作表面储油结构对缸套耐磨性的影响，并将传统珩磨、平顶珩磨、自激振动加工、冲击加工微孔方法、超声振动珩磨及激光珩磨的优缺点进行了对比，表明了激光珩磨更能提高气缸套的润滑性和耐磨性，从而能显著增强发动机性能，降低污染物排放。     

超声珩磨钢质薄壁缸套的试验设计研究

采用纵向振动立式超声珩磨装置,分别在MB4215Z型半自动珩磨机和M4215型珩磨机上,对钢制薄壁缸套基体进行三因素、四水平正交试验,研究了超声珩磨油石的特性,包括超硬磨料、粒度、结合剂等对表面粗糙度、尺寸精度、圆度和珩磨效率等的影响及影响程度。结果表明,超声珩磨可以有效地解决钢制薄壁缸套的珩磨加工难题,为珩磨加工软钢提供了理论依据,对实际生产具有一定的指导作用。     

超声珩铰装置设计与研究

薄壁缸套在镗孔、珩磨加工中极易变形，很难控制批量生产时的加工精度。超声珩、铰加工能提高薄壁缸套的尺寸和形状精度，为此研制了一套超声珩铰装置，并进行了加工实验。     

薄壁钢质缸套平顶珩磨的试验与分析

钢质薄壁缸套是使用越来越多的一种缸套，而平顶珩磨工艺作为发动机缸套孔加工的最后一道工序，正在发挥着日益重要的作用。文章结合试验取得的数据对影响平顶珩磨工艺指标的夹具、珩磨头的结构及制造精度、珩磨工艺参数的选择等各种因素进行了较详细的分析。     

发动机缸套超声振动珩磨专用夹具的设计

功率超声振动珩磨就是通过在油石上施加功率超声振动,以进行珩磨。与普通珩磨相比,这种加工方法在加工时产生的珩磨力较小、珩磨温度低、在提高表面质量的同时油石磨损较小、最重要是加工精度高。针对发动机缸套的超声振动珩磨设计了一套专用的定位加工的夹具。该夹具采用外抱式结构,在夹具体和缸套之间填充液性塑料这种介质,由此介质均匀的将力施加到弹性套上,从而实现了缸套的轴向夹紧。夹具克服了在传统缸套加工中难实现定心定位,易轴向变形的缺点。     

降低发动机油耗的新珩磨工艺

介绍了一种加工珩磨发动机缸套的新工艺－往复式珩磨和螺旋往复式珩磨,并对使用该工艺加工的发动机缸套的加工质量、使用寿命以及整机的油耗、污染物的排放等方面进行了论述。     

镗床用珩磨头

在液压和气动机构的维修加工中,一般均需对缸套和缸筒进行珩磨,直径大于150毫米的缸套珩磨,由于许多工厂不具备较大的搪磨机,往往给维修加工造成困难。我们制作了如图所示的通用性较大的珩磨头,利用普通镗床完成了一系列尺寸不同的缸套的珩磨,保证了质量和装配要求。     

坦克发动机缸套超声珩磨系统

研制了用于加工坦克发动机缸套（ 孔径１５０ｍｍ）的超声珩磨系统样机,通过工艺试验优选了油石条参数及加工工艺参数。试验结果表明,该样机可满足坦克发动机缸套的珩磨加工要求。     

掩膜电解加工气缸套微造型摩擦性能研究

优化电解参数对气缸套进行掩膜电解加工,同时采用数控铣床对缸套试件加工出相同或相近尺寸微坑,然后对不同加工方式的缸套进行往复摩擦磨损实验。结果表明:在富油工况下,掩膜电解加工微造型缸套摩擦系数比机械珩磨缸套试样减小了11.35%、比机械加工微造型减小了6.41%,磨损量比机械珩磨缸套试样减小了32.75%、比机械加工微造型缸套试样减小了4.56%;在贫油工况下,掩膜电解加工微造型缸套比机械珩磨缸套试样抗黏着磨损时间延长了48.52%,比机械加工微造型缸套试样延长了9.57%;通过对试样磨损前后表面形貌进行微观检测分析,微造型形貌和电化学协同作用造就了其优异的抗磨减摩性能。     

薄壁圆管内孔珩磨加工专用夹具设计

针对薄壁圆管工件内孔珩磨加工时易出现较大变形而导致加工精度难以保证的问题,通过对掘进机上某薄壁圆管零件的珩磨工艺分析,设计了一种薄壁圆管内壁珩磨专用夹具,改善了薄壁圆管工件的磨削工艺性,提高了加工精度和生产效率。     

大功率两冲程柴油机气缸套加工工艺

在分析230系列大功率两冲程柴油机气缸套的结构特点和应用优势的基础上,探讨了加工该缸套的工艺路线并分析了工艺难点。研究了缸套毛坯铸造、缸套本体与水套钎焊、内孔激光淬火强化处理以及异形内孔珩磨等关键工艺技术并进行了试验验证。基于以上研究完成了230型气缸套的国产化研制并进行了批量装机应用,应用效果表明该气缸套服役性能良好。     

Roughness variations in cylinder liners induced by honing tools’ wear

The manufacturing and finishing (honing) of cylinder liners for the automotive industry is a constant challenge in order to reduce friction losses and oil consumption. A better knowledge of surfaces generated during plateau honing is then required for optimization of the process. Despite a well-known and controlled honing process, variations in surface roughness appear due to honing tool wear and need to be mapped and analyzed. The following paper proposes to map the variations in roughness by using confocal 3D measuring equipment able to inspect any area of a cylinder liner. Six motor blocks, each with five cylinder liners, were evaluated with 20 topography measurements per liner (giving six hundred 3D measurements in total). In addition to standard 3D roughness parameters, tailor made parameters extracting honing texture information are computed. The results show that only a few parameters (Spk, Ssc and Sk) do correlate with the honing tool wear specific to each cylinder. Tailor made parameters indicate similar results. Indeed, as the honing tool wears down, the cylinder liner surface gets rougher plateau or peaks and sharper asperities indicating that ploughing occurs instead of cutting. In future, experimental models could be built in order to perform production and functional optimizations.     

An accurate and robust method for the honing angle evaluation of cylinder liner surface using machine vision

This paper presents a machine vision-based method for evaluating honing angle of cylinder liners by exploring the frequency domain characteristics of cylinder liner images. An image-processing algorithm based on Fourier transform and Hough transform is developed and applied on images containing the honing texture patterns captured from 14 cylinder liners manufactured with varying honing angles. The images are captured from cylinder liner surfaces by destructive and non-destructive manner using a charge-coupled device camera attached with magnifying lenses and a miniature microscopic probe respectively.A graphical user interface-based program and protractor-based manual method are used for verifying the accuracy and consistency of the developed image-processing algorithm for automatically evaluating the honing angle from the captured images of cylinder liner surfaces. The results clearly demonstrate the efficacy of the proposed method for robustly evaluating the honing angle and it can be used by the cylinder liner manufactures for fast and accurate measurement of honing angle with a resolution of 1°.     

气缸套平台珩磨网纹片状覆盖缺陷的产生原因及预防

表面片状覆盖缺陷严重影响了气缸套平台珩磨网纹结构的预期功能。本文分析了片状覆盖缺陷产生的主要原因为珩磨加工过程造成的挤压变形,挤压变形的结果使表面产生一层片状覆盖物,在表面呈现出严重的撕裂和存在大量的金属碎片。并指出使用先进的刷珩技术能有效去除表面的片状覆盖缺陷,在现有技术条件下可采用碳化硅砂条、采用两道珩磨工序等方法降低片状覆盖的影响。     

Analysis of surface texture of plateau-honed cylinder liner – A review

The surface of cylinder liner is tribologically important. In most cases, it has a two-process cross-hatched structure created by the plateau honing process. Because the surface topography of cylinder liners is complicated, its analysis is challenging. Special methods have been used to analyse the textures. In this article, first, the parameters in the standard are reviewed. Next, the methods for selecting the reference elements are presented. Other comprehensive methods of cylinder surface analysis are described. Finally, methods of cylinder texture modelling are analysed.     

柴油机气缸孔变形研究和工艺改进

本文介绍了柴油机气缸孔变形研究过程和工艺改进结果。研究结果表明:机械加工残余应力是气缸孔变形的主要原因;降低机械加工残余应力可以有效地控制气缸孔变形;改进珩磨工艺可以有效地控制气缸孔变形。     

超声珩磨系统中指数变幅杆的设计与研究

在对超声珩磨系统中指数变幅杆进行理论分析的基础上，设计与制造了可与换能器匹配的指数型变幅杆。给出了指数变幅杆的制造尺寸，为制造指数变幅杆提供依据。     

缸孔平台网珩磨工艺

通过对平台网珩磨加工中精珩、光珩采用的油石、压力、时间等进行试验分析 ,确定发动机缸孔平台珩磨工艺     

Quantification of the cold worked material inside the deep honing grooves on cylinder liner surfaces and its effect on wear

The increased presence of cold work material on cylinder liners due to the introduction of the diamond honing is undesirable as it seals the oil-bearing honing grooves. The most of it is a smeared metal inside the deep honing grooves (blechmantel) that may break and act as abrasive wear particles increasing the bore wear. An attempt has been made to estimate the extent of removal of blechmantel for different wear regimes present at the middle and top region (near the top dead centre) of the liner surface using the least worn bottom region as a reference for comparison. A number of truck grey iron cylinder liners were axially sectioned after varying periods of engine running under similar conditions of load, engine speed and lubrication. 3D surface measurements were taken at the three regions and a range of standard parameters was extracted. Combining the profile and image analysis, an algorithm was developed to identify and quantify the blechmantel. The algorithm has successfully identified/quantified the blechmantel and can be used for automatic surface quality and process control. It was found that the amount of the blechmantel in the middle section was approximately the same (though slightly lower) as that in the bottom section, while there was a considerable dislocation and removal of blechmantel in the top section and thereby it represents one of the possible causes for wear. Axial wear scratches of different size and distribution were observed not only through the whole stroke area, but also in the bottom region. All engines and liners performed well throughout the tests, and the observed quantities of blechmantel and axial scratches are acceptable for the time being.