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。     

发动机缸孔平台珩磨加工技术初探

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。     

发动机缸孔平台珩磨加工技术初探

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。     

激光微造型表面摩擦磨损性能研究

采用声光调Q二级管泵浦固体光源（DPSS）Nd：YAG激光器对缸套试件表面进行了，微造型州纹加工。在往复式活塞环-缸套摩擦磨损模拟试验机上进行了激光造型缸套试件与未造型光滑缸套试件的摩擦磨损性能对比试验研究。试验结果表明，在重载高速条件下，激光网纹试件与未造型试件相比，摩擦因数降低23％，磨损量降低66％。说明激光网纹沟槽具有贮油、积屑和动压润滑作用，同时激光加工的网纹淬火效应也有利于提高支承表面的耐磨抗擦伤性能。     

摩擦副表面Nd:YAG激光微造型技术及其应用研究

在声光调Q二级管泵浦固体光源（DPSS）Nd：YAG激光器基础上，采用“单脉冲同点间隔多次”激光微加工工艺，对灰铸铁材料进行表面微造型加工。试验研究表面，该工艺能克服热效应产生的不良影响，有效防止金属熔融和重铸现象。通过选择合适的脉冲次数、激光波长以及辅助气体工艺，可获得较理想的微腔形貌和表面质量。采用JXA-840A分析了微加工形貌，表明微腔（槽）表面留有一层致密的硬化层，且与基体结合良好。通过对CA6DF2-26型柴油机激光珩磨缸套的性能试验，表明与普通平顶珩磨相比，柴油机机油耗降低53％，漏气量降低33％-50％。     

内燃机缸套珩磨面油膜承载的流体动力润滑分析

本文运用平均流模型对珩磨缸套表面模拟,求解了压力流因数和剪切流因数,建立了活塞裙部与珩磨缸套表面间的流体动力润滑方程,并且讨论了活塞滑动时,网纹角度变化时珩磨面油膜承载能力的影响。计算出的理想珩磨网纹角度值,与目前珩磨加工中所推荐的网纹角度值相吻合。     

浅谈气缸套的网纹与使用性能

本文回顾了气缸套内表面加工技术的发展过程,着重介绍当今缸套平台珩磨网纹的使用性能及加工的关键技术。     

铸铁缸套的多元共渗黑化处理

<正> 前言“康明斯”大功率柴油机缸套是某厂出口创汇的新产品。据外贸标样要求:除化学成分、组织性能,外形尺寸必须附合标准外,缸套的内外表面一定要呈现均匀黑亮的色泽,才能进入国际市场。为此,该厂先后对缸套进行常规的发黑与磷化处理,但均因处理过程中的“酸流”工序破坏了缸壁特有的珩磨网纹与表面粗糙度而告失败。鉴于     

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。     

气缸套平台网纹加工技术研究

1·气缸套平台网纹表面的优越性能(1)缩短磨合时间,延长缸套寿命与普通珩磨相比,在平台网纹的加工过程中,气缸套工作表面的尖峰、毛刺被清除掉,所以初期磨合性能优良,缸套很快进入正常工作期,提高使用寿命,平台网纹表面可以保     

缸套表面织构润滑性能理论及试验研究

通过将激光表面织构技术应用于发动机缸套表面,建立缸套-活塞环摩擦副混合润滑理论模型,并以桶面环为例,计算缸套表面织构对摩擦副润滑摩擦性能的影响规律。计算结果表明：缸套通过激光表面织构后,其润滑摩擦性能得到改善,凹腔织构效果要优于沟槽织构效果,在各行程中部油膜厚度最大增加了29%左右,而摩擦力峰值下降30%左右。通过发动机对比台架试验发现：相对于原机,配套表面织构缸套后发动机燃油消耗率呈现出下降趋势,在低转速下改善效果最为显著,燃油消耗率最大降低了9.8 g/(kW•h),降幅为4.62%,证实了表面织构技术对于降低发动机摩擦损失是有效的;同时发动机的其他性能指标也有不同程度改善,漏气量、烟度、全损耗系统用油消耗率等参数都有所下降,烟度下降明显,漏气量最大降幅为34.6%,全损耗系统用油消耗率降低了33.8%。     

Investigation on Dimples Distribution Angle in Laser Texturing of Cylinder–Piston Ring System

The effectiveness of laser surface texturing in reducing wear rate was studied, with emphasis on dimple distribution angle. Experiments were performed by varying the texturing parameters to derive variational rulesof the wear scar depth on laser-textured cylinder walls under starved lubrication conditions, and the optimum laser texturing dimple distribution angle was obtained. It was found that the laser texturing could result in less wear rate compared to mechanical honing.     

Improving fuel efficiency with laser surface textured piston rings

An experimental study is presented to evaluate the effect of partially laser surface textured piston rings on the fuel consumption and exhaust gas composition of a compression-ignition IC engine. Dynamometer tests were performed with a Ford Transit naturally aspirated 2500 cm³ engine at a wide range of engine speeds under near-half-load conditions. A comparison was made between the performance of reference non-textured conventional barrel-shaped rings and optimum partial laser surface texturing (LST) cylindrical-shape rings. It was found that the partial LST piston rings exhibited up to 4% lower fuel consumption, while no traceable change in the exhaust gas composition or smoke level was observed.     

模具钢表面激光毛化织构摩擦磨损性能试验研究

为提高模具的使用寿命,以模具钢5CrNiMo为研究对象,在试样表面加工不同面积占有率及高度的毛化织构,采用单因素轮换法,开展织构化试样的摩擦磨损性能试验研究。结果表明:毛化织构面积占有率对跑和后试样摩擦因数影响不大,但织构面积占有率越大,其跑和阶段的摩擦因数波动越小,跑和性能越优;毛化织构高度对平均摩擦因数影响较大,织构高度越低,跑和稳定后平均摩擦因数越小;织构试样磨损量均小于未织构试样,织构面积占有率越大,织构高度越低,磨损量越小。与未织构试样相比,面积占有率45%、毛化高度3. 5μm的织构试样可使摩擦因数减小85%,磨损量减小99%,表明激光毛化织构技术可优化塑性成形模具的摩擦学性能。     

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Reciprocating piston engines are the major propulsion devices for light aircrafts, helicopters, and essentially all automotive vehicles. They are expected to fulfil both present-day and future demands for engine performance, durability, fuel economy, and exhaust emissions legislation. One of the key factors related to these demands is the need to the limit thermomechanical internal losses, wear, and lubricating oil consumption, which are in turn conditioned by the tribological behavior of the piston–cylinder assembly. Consequently, this latter system requires a multi-directional approach in terms of manufacturing. Apart from various modifying techniques (e.g. laser texturing), a conventional plateau-honing operation is still the standard technology for shaping cylinder liner surface microstructure. This paper describes the distinctions between variations in the performance of the engines in relation to cylinder liner roughness parameters due to different honing settings. Five air-cooled reciprocating aircraft engines (FRANKLIN 4A-235-B31) served as the objects of research. The engines passed durability tests on the dynamometer bed, including operation under artificially intensified wear conditions. The results show a significant impact of the brand-new honed cylinder liner surface microstructure on the engine output parameters. Detailed study proves that some of the cylinder liner roughness parameters, specifically, the slope of the root mean square line (RMS) for valley roughness Rvq and the linear triangle area for valleys A2, are strongly correlated with the engine operational properties. Higher values of Rvq and A2 are associated with an improvement in engine performance but result in a deterioration in the exhaust harmful emission.     

用于显著改善摩擦副润滑状态的激光珩磨技术

对摩擦副工作表面进行激光珩磨,形成与其表面润滑减摩性能优化匹配的、连续均匀的,并具有一定密度、深度、角度、形状的油路和凹腔。该技术特别适用于对气缸孔表面进行激光微观造型,不仅可以显著提高气缸孔耐磨性能,延长其寿命,而且还大幅度降低内燃机的颗粒排放量、机油耗、燃油耗、催化器污染和活塞环组成本。     

气缸工作表面微结构数控激光成形机

数控激光珩磨机由粗珩磨机、数控激光成形机和精珩磨机组成，其中，数控激光成形机是其关键部分。在分析表面微结构研究现状的基础上，提出了数控激光成形机两种运动方案，研制出数控激光成形机，并进行了加工试验。试验结果表明，所研制的数控激光成形机性能稳定，工作可靠，达到设计要求。     

The Effect of Laser Texturing of Steel Surfaces and Speed-Load Parameters on the Transition of Lubrication Regime from Boundary to Hydrodynamic

Laser surface texturing (LST) is an emerging, effective method for improving the tribological performance of friction units lubricated with oil. In LST technology, a pulsating laser beam is used to create thousands of arranged microdimples on a surface by a material ablation process. These dimples generate hydrodynamic pressure between oil-lubricated parallel sliding surfaces. The impact of LST on lubricating-regime transitions was investigated in this study. Tribological experiments were carried out on pin-on-disk test apparatus at sliding speeds that ranged from 0.15 to 0.75 m/s and nominal contact pressures that ranged from 0.16 to 1.6 MPa. Two types of oil with different viscosities (54.8 cSt and 124.7 cSt at 40°C) were evaluated as lubricants. Electrical resistance between flat-pin and laser-textured disks was used to determine the operating lubrication regime. The test results showed that laser texturing expanded the range of speed-load parameters for hydrodynamic lubrication. LST also reduced the measured friction coefficients of contacts that operated under the hydrodynamic regime. The beneficial effects of laser surface texturing are more pronounced at higher speeds and loads and with higher viscosity oil.     

磨料粒度对表面微织构纯钛干摩擦性能的影响

为了提高钛及钛合金钻具在超深钻探、深海钻探和外太空钻探工程中的减摩抗磨性能。利用激光表面加工技术在工业纯钛（TA2）表面制备了不同参数的点阵微织构。采用MS-T3000摩擦磨损试验机测试了微织构钛合金在不同粒度模拟月壤作用下的摩擦学性能。利用扫描电子显微镜和能谱分析仪分析磨痕形貌及元素含量。研究结果表明：当磨料粒度小于微织构点阵的直径时,磨料压入微织构点阵里,磨料具有滚动和滑动两种运动方式。当粒度大于微织构点阵的直径时,磨料不能完全压入微织构点阵里,磨料对微织构TA2表面产生了滑动犁削作用。由于两种磨料磨损的作用机理不同,同等条件下,小粒度的磨料作用下的微织构TA2的摩擦因数和磨损率较大粒度磨粒作用下的最大减少量分别为50%和53%。考虑磨料粒度与微结构的匹配性,可以大大降低摩擦减少磨损。