TC4钛合金材料采用金刚石砂轮磨削时的工艺参数优化

钛合金材料在航空器和发动机中的应用极为广泛,涡扇发动机中低压压气机静子叶片基本由钛合金材料制成,由于钛合金的磨削性能较差,对选用金刚石砂轮进行钛合金材料磨削时的主要工艺影响因素（如进给速度、磨抛深度等）进行了试验分析,优选出更适用于金刚石砂轮磨削钛合金的工艺参数,该参数不仅能够用于自研的双面仿形抛修设备,还可以对其他型号磨床磨削钛合金材料时的工艺参数选择提供指导。     

电镀砂轮磨损对GH4169磨削表面完整性的影响

电镀砂轮具有优异的成型性和形状保持能力,越来越广泛地应用于复杂曲面的加工,但是磨损对零件表面完整性影响的研究并不充分.在深入分析利用圆环型砂轮在插磨方式下加工GH4169试件所产生的表面形貌形成规律的基础上,对高刚度矩形试件的磨削表面粗糙度随砂轮磨削量的变化进行了详细记录,并对某型号发动机静子叶片进行实际磨削验证.试验结果表明,精磨时适当的砂轮磨损可以使高刚度试件表面粗糙度下降35％,对表面硬度和残余应力影响不大;而叶片的弱刚度会大幅提高磨削粗糙度,但适当的砂轮磨损可以使叶片端部粗糙度下降64％,并降低刚度对粗糙度的影响,进而提高叶片表面磨削质量的一致性.因此,通过磨削粗糙度对砂轮的磨损状况进行大致评估,选择合适磨损量的砂轮用于精加工,以充分降低工件的表面粗糙度并提高磨削质量的一致性.     

单层超硬磨料砂轮制造技术新发展

概述了国外单层高温钎焊超硬磨料砂轮的工艺优势及主要研究成果，这种新型超硬磨料砂轮以其卓越的磨削性能已在国内外磨削界引起了轰动，它在今后逐步替代传统砂轮应是一种无法抗拒的必然趋势。鉴于它极其广阔的应用前景，国内在推广应用超硬磨料砂轮时也必将大力引进开发此种单层钎焊砂轮。为使国内开发钎焊砂轮有一个更高的起点，作者提出了关于开展这一领域研究的若干构想和实施方案     

Design and experimental study of a micro-groove grinding wheel with spray cooling effect

The effectiveness of grinding fluid supply has a crucial impact on grinding quality and efficiency in high speed grinding. In order to improve the cooling and lubrication, through in-depth research of self-inhaling internal cooling method and intermittent grinding mechanism, a new spray cooling method used in high speed grinding is proposed. By referring to the structure of bowl- shaped dispersion disk, the grinding wheel matrix with atomization ability is designed; through studying heat transfer of droplet collision and the influence of micro-groove on the boiling heat transfer, grinding segment with micro-groove is designed to enhance the heat flux of coolant and achieve maximum heat transfer between droplets and grinding contact zone. High-speed grinding experiments on GH4169 with the developed grinding wheel are carried out. The results show that with the micro-groove grinding wheel just 5.4% of pump outlet flow rate and 0.5% of spindle energy is needed to reduce the grinding temperature to 200℃, which means the developed grinding wheel makes cooling high efficient and low energy consuming.     

Grinding performance evaluation of porous composite-bonded CBN wheels for Inconel 718

For high-efficiency grinding of difficult-to-cut materials such as titanium and nickel alloys, a high porosity is expected and also a sufficient mechanical strength to satisfy the function.However, the porosity increase is a disadvantage to the mechanical strength. As a promising pore forming agent, alumina bubbles are firstly induced into the abrasive layer to fabricate porous cubic boron nitride（CBN） wheels. When the wheel porosity reaches 45%, the bending strength is still high up to 50 MPa with modified orderly pore distribution. A porous CBN wheel was fabricated with a total porosity around 30%. The grinding performance of the porous composite-bonded CBN wheel was evaluated in terms of specific force, specific grinding energy, and grinding temperature, which were better than those of the vitrified one under the same grinding conditions. Compared to the vitrified CBN wheel, clear straight cutting grooves and less chip adhesion are observed on the ground surface and there is also no extensive loading on the wheel surface after grinding.     

超精密平面磨床设计中的关键技术

介绍了超精密平面磨床设计中的主要关键技术．主轴及Ｘ．Ｙ．Ｚ轴导轨均采用了气体静压成液体静压轴承，采用误差补偿技术对Ｘ．Ｙ轴导轨误差进行补偿，三轴均由ＣＮＣ系统控制．设计了分辨率为０．０１μｍ的砂轮特殊微量进给装置，并应用了砂轮电解在线修整（ＥＬＩＤ）技术．     

300M超高强度钢磨削残余应力的研究

低应力磨削表面对于保证飞机关键零件的使用性能有重要意义。本文系统地研究了３００Ｍ超高强度钢的磨削残余应力的特征及其主要影响因素，提出了低应力磨削３００Ｍ钢的工艺途径。     

航空发动机波瓣形轴承加工技术

波瓣形轴承是中小型航空涡轮发动机的关键零件，主要用来解决航空发动机在高速工作情况下出现的轻载打滑问题。针对这种轴承的外圈波瓣形滚道的加工情况，提出了一个采用直线电机直接驱动进行数控磨削的加工方案，解决了加工的关键技术问题。该方法已用于某型号航空发动机主轴轴承的加工，效果良好。     

砂轮不等分间隙槽的切割方法

在生产实践中总结出一种提高难加工材料磨削效率的方法——将砂轮修成不等分的间隙槽。介绍了将砂轮修成不等分间隙槽的制作过程,以及在生产应用中的使用效果。