共查询到19条相似文献,搜索用时 258 毫秒
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发动机缸体的缸孔与缸盖、活塞组成燃烧室,承受高温、高压燃烧气体的冲击,为了保证活塞能够在缸孔中良好的运行,又不产生烧机油及拉缸现象,以致影响发动机的经济性、动力性及环保性,就需要控制好缸孔表面加工质量。本文阐述了珩磨技术在发动机缸孔加工过程中的发展历程、缸孔表面质量的评价参数、影响平台珩磨质量的因素以及如何控制平台珩磨质量。平台珩磨工艺对于提高发动机的使用寿命,克服发动机早期磨损及降低发动机油耗等方面起到了重要作用。 相似文献
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平台珩磨是目前被广泛应用的一种发动机缸孔精加工工艺,珩磨后缸孔的表面粗糙度直接影响缸孔的摩擦磨损性能。针对某型发动机缸孔的平台珩磨工艺,采用正交试验的方法研究平台珩磨转速、粗珩进给率、精珩时间对缸孔表面粗糙度的Abbott参数(波峰平均高度Rpk、波谷平均深度Rvk)和加工效率的影响规律。研究结果表明:珩磨转速对Rpk、Rvk的影响最大,其次为精珩时间,粗珩进给率对其影响很小;而通过提高粗珩进给率,能够在不显著改变缸孔表面粗糙度的条件下,大幅度提升平台珩磨加工效率。 相似文献
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发动机缸套工作表面的质量对发动机的工作性能、使用寿命以及经济性能有着重要的的影响,发动机缸孔平台网纹珩磨技术就是保证缸孔表面质量的重要手段,论文简要介绍平台网纹珩磨加工技术的优势、加工原理、评价方法及关键技术参数,并将其应用到V6、4GB发动机缸套实际加工,取得了很好的效果。 相似文献
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发动机缸套工作表面的质量对发动机的工作性能、使用寿命以及经济性能有着重要的的影响.发动机缸孔平台网纹珩磨技术就是保证缸孔表面质量的重要手段,论文简要介绍平台网纹珩磨加工技术的优势、加工原理、评价方法及关键技术参数,并将其应用到V6、4GB发动机缸套实际加工.取得了很好的效果。 相似文献
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1 引言 近年来,利用金刚石珩磨加工的领域已经覆盖了所有的黑金属加工行业.在汽车行业广泛应用于发动机缸孔加工.发动机缸孔的表面质量参数,过去一般仅采用表面粗糙度Ra进行评价.但采用平台网纹珩磨后,发动机缸孔的表面参数是在德国Nagel公司工艺试验的基础上,结合保时捷咨询结果及道路试验确定的. 相似文献
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王泽民 《机械工人(冷加工)》2005,(10):27-28
刷珩是一种近年来国际最新发展起来的先进的珩磨工艺技术,主要用于高档汽车发动机缸体孔、气缸套等精密偶件孔加工领域。主要解决碳化硅砂条、立方氮化硼砂条等传统珩磨造成的内壁表面粗糙度较大,易形成拉缸、早期磨损、网纹沟槽质量较差等弊端,刷珩也克服了激光珩磨工艺中工效低的致命弱点。随着当今国际发动机制造技术的进步以及环保排放规则进一步要求,可以展望:刷珩将成为当前发动机气缸套、缸体孔等精密偶件孔加工的重要工艺技术。 相似文献
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陈刚中 《机械工人(冷加工)》2010,(8):37-37
零件上孔的加工方法很多,如钻孔、扩孔、铰孔、镗孔和珩磨等。对于一些精度要求较高的孔,如发动机缸筒、连杆大头孔等,精镗后珩磨是一种常用的加工工艺,能保证孔的尺寸精度和表面粗糙度要求。 相似文献
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本文是在研究柴油发动机缸体缸孔底孔加工工艺试验过程中,对取消珩磨加工底孔工艺可行性进行研究。传统缸孔底孔加工工艺为:粗镗→半精镗→精镗→珩磨,经过实际数据采集与分析,样件的试生产及样件整机的台架实验,验证了采用精镗缸孔底孔工艺的可行性,为后续样件整机路试和样件在生产线上小批试生产提供了基础和依据。论文以B系列六缸缸体为例,分别从缸孔底孔不珩磨样件的机加工和缸孔底孔不珩磨样件整车台架实验两方面对缸体缸孔底孔取消珩磨的可行性进行了论证,最终得出底孔不珩磨样件整机在台架实验阶段能够满足发动机整体性能要求。 相似文献
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轿车发动机缸孔珩磨装备是多孔缸体加工的常用设备,具备四珩磨轴同步加工功能,根据珩磨加工工艺,通常4个珩磨轴分两组,分别完成粗珩加工和精珩加工。为了提高加工效率,可双轴同步加工一个工件,或者轮番式分别加工不同的工件。根据对国内汽车厂家所使用的汽车珩磨加工自动线的调研,结合实际珩磨加工工艺,分析总结出,采用轮番式加工工艺流程,能实现加工效率的最大化,在实际开发轿车发动机缸孔珩磨装备中得到了成功应用。 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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分析了珩磨加工康明斯发动机缸孔时存在的工艺缺陷 ,提出了采用圆周对称均布结构的珩磨头、凹槽形金刚石精珩磨条、三级珩磨工艺方案等工艺改进措施。工艺改进后缸孔珩磨工序生产节拍加快 ,加工质量提高 相似文献