镍基高温合金珩磨材料去除率研究

针对典型的镍基高温合金材料GH4169开展珩磨试验,研究了主轴转速、往复速度、每往复进给量、油石粒径对材料去除率的影响规律。结果表明:主轴转速对材料去除率影响较小,其余三因素均对材料去除率有显著影响,其中每往复进给量和油石粒径的影响最为显著,且材料去除率与三者均呈现正相关关系。进行多元线性回归拟合出经验公式。同时还发现,适当提高网纹交叉角可以提高珩磨材料去除率。对加工余量一定且粗糙度要较高的内孔珩磨进行了工艺优化,实现了更高的加工效率。     

精密小直径盲孔珩磨

在论述了珩磨、盲孔珩磨现状的基础上,重点介绍了精密小直径盲孔珩磨的原理、珩磨条座、珩磨杆的结构,可达到的加工精度,推广此项工艺应解决的问题及其展望。     

Characterization and life prediction of single-pass honing tool for fuel injection nozzle

Single-pass honing is an important machining method for finish machining of holes, which can meet the requirement for high efficiency and consistency of holes. Characterization and life prediction of single-pass honing tool are necessary to improve the machining accuracy of holes honed, especially dimension accuracy. Single-pass honing tool is a single layer abrasive tool with fixed dimension, which still remains problematic for characterization and life prediction. For fuel injection nozzles with bore diameter under 1 mm, the stiffness of the single-pass honing tool is poor. This article presents a novel analytical model that predicts life of the tool with poor stiffness. Firstly, according to the bore diameter and dimension tolerance, the single-pass honing tool is designed and manufactured. Based on the prepared single-pass honing tool, the measurement and characterization methods are established. Furthermore, the tool wear tests are carried out, and the tool contour evolution model is established to predict the tool life.     

半球型零件球面精密珩磨技术研究

作为精密加工技术之一,珩磨工艺往往用于内孔的光整加工.本文在分析球面研磨与珩磨加工特点的基础上,对球面精密珩磨加工技术进行深入研究,主要包括球面珩磨加工原理,珩磨头磨料选取和结构设计,球面珩磨速度参数对表面轨迹的影响,以及珩磨头压力对加工效果的影响研究.根据以上研究结果,对一批产品进行工艺试验,结果表明,采用球面珩磨技术加工出的零件能够满足产品的各项精度指标,同时加工效率较球面研磨提高3倍.     

航空活塞发动机修理中珩磨应用技术研究

以某型航空活塞发动机连杆修理中衬套的珩磨为例,对珩磨压力、油石行程和珩磨速度三个主要工艺参数进行研究,以找到该型发动机连杆修理衬套珩磨的最佳技术参数标准,从而为发动机其他类似部件的修理提供参考。     

精密盲孔珩磨工具设计技巧

介绍了影响盲孔珩磨精度的问题所在,根据平衡力矩原理,设计带有补偿油石磨损差值的珩磨工具,实现了在油石上下超程不相等的条件下,达到了对孔各部位的等量切削。