超硬磨料砂轮修整技术的新发展

硬脆材料精密超精密磨削加工的质量水平主要取决于砂轮的修整效果,本文论述了超硬磨料砂轮近年来新发展的激光修整、超声振动修整、电火花修整和在线电解修整技术等的修整原理、特点及效果,并且介绍了新发展的在线修整与检测技术的发展.     

超硬砂轮的堵塞及修整

为使超硬砂轮能发挥其优异的性能，应避免堵塞和重视修整。用单颗粒金刚石修整工具是不适宜的。作对磨削修整法和制动修整法进行了研究，取得了好的效果。     

超硬砂轮修整机工艺原理

针对超硬砂轮不易于修整的现实情况,从提高精度与加工效率角度,开发了一台应用在线检测技术的超硬砂轮专用修整机。修整机以软磨硬,利用碳化硅砂轮修整超硬砂轮,再通过CCD传感器采集图像,将图像传递到计算机软件影像区,软件提供对比检测功能,对超硬砂轮进行修磨。对此超硬砂轮修整机的结构及工艺原理的进行了系统设计,将在线检测技术运用到超硬砂轮的修整上,找到了整个修整机中的布局中软硬件的关键结合点。对超硬砂轮的普遍应用情况,给予基本分类,并给出典型圆弧砂轮的修整模板。此修整机的设计与应用将为国内超硬砂轮的修整提供重要的借鉴手段。     

激光修整金刚石砂轮的研究

利用Ｎｄ： ＹＡＧ脉冲固体激光器进行了激光修整青铜和树脂结合剂金刚石砂轮的试验,借助于扫描电镜分析了激光作用后金刚石砂轮表面的微观形貌,探讨了激光修整金刚石砂轮的机理。通过与普通碳化硅砂轮磨削修整法的对比分析和试验,研究了激光修整金刚石砂轮的修整效果。研究结果表明,激光修整的金刚石砂轮表面具有较大的磨粒突出高度和容屑空间和良好的磨削性能。激光修整技术是一种很有前途的新技术。     

气介质电火花修整金刚石砂轮机理及分析

针对传统机械式金刚石砂轮修整的低效和液体介质电火花加工污染环境等问题,介绍了对现有精密机械式砂轮修整机的改造,分析了气介质下电火花修整金刚石砂轮的机理,对极性效应和脉冲宽度对砂轮修整的影响进行了实验。通过分析被加工砂轮表面的形貌发现,气介质下电火花修整金刚石砂轮宜采用正极性加工,盘状电极的使用克服了加工过程的短路、拉弧的现象,提高了修整的稳定性。在20～500μs的脉冲宽度范围内,随着脉冲宽度的不断加大,砂轮表面结合剂熔融现象越来越明显,蚀除的凹坑也越大。     

椭圆砂轮截形的修整误差

本文介绍了采用圆弧修整法修整砂轮时调整参数的确定方法，并推导出了砂轮修整误差方程，为采用切入磨削法磨削椭圆沟道时，如何控制砂轮修整误差提供了重要的依据。     

电解修整金刚石砂轮的工艺研究

试验研究人造金刚石砂轮的电解修整方法.在分析各种硬度整形笔整形效果的基础上,讨论了 TL80#整形笔的作用机理.     

三角形PCD修整器修整砂轮时的磨损及修整效果分析

作为砂轮修整器的材料,ＰＣＤ在性能上接近单晶金刚石,而在价格上相对便宜得多,和三角形ＰＣＤ修整器对氧化铝砂轮的修整,采用磨耗比作为评定指标,分析了修整器在修整过程中的三个磨损阶段,即初期磨损和剧烈磨损,并了提出了造成修整器磨损的原因,除机械磨损外,还有金刚石微晶粒的破碎脱落和高温下的石墨化磨损,通过分析修整器磨损对修整效果的影响,提出适当地修磨修整器负倒棱可以缩短初期磨损阶段,并且适当控制修整器的     

高温钎焊单层超硬磨料砂轮制备技术

<正>技术开发单位南京航空航天大学技术简介在制造业中,超硬磨料砂轮的应用极为广泛。其中,单层电镀的超硬磨料砂轮由于本身制备工艺简单、使用方便,在国内市场上占据着极为重要的地位。然而,在实际生     

Development of twin wheel creep-feed grinding machine using continuous dressing for machining of aircraft rotary wing

The purpose of this study is to develop a twin wheel creep-feed grinding machine using continuous dressing to machine precise axisymmetric turbine blades that have been difficult to machine using a conventional creep-feed machine.In order to develop such a machine,3D-modeling and machine simulations were performed and a twin wheel creep-feed grinding machine was manufactured.Furthermore,the axisymmetric precision of the machined workpieces through practical machining was evaluated and the quality of the con...     

在线电解修整镜面磨削中砂轮耐用度的研究

在线电解修整（ＥＬＩＤ）削磨是镜面磨削加工的技术。在分析ＥＬＩＤ镜面磨削机理的基础上,对ＥＬＩＤ磨削过程中影响砂轮耐用度的主工因素,包括电解修整参数、磨削液成分、磨削工艺参数和砂轮结合剂等进行了实验研究和分析,说明由于在线电解修整过程中的非线性电解作用,这些因素对砂轮磨损速度的影响可以通过残留维持电流反映出来,最后根据在线电解修整过程的特点,给出了用残留维持电流估算砂轮耐用度的计算公式。     

陶瓷磨削技术的研究进展

随着先进陶瓷材料的开发和应用的日益广泛，陶瓷材料的加工技术和陶瓷材料本身的理论研究得到了长足的发展。从上世纪90年代开始，国内外学者进行了大量的研究，在陶瓷磨削的新方式、陶瓷磨削的材料去除机理、磨削加工损伤和强度损失的定性定量分析、砂轮修整技术的发展等多方面都取得了积极的研究成果。结合近年来相关的文献资料，对国内外陶瓷磨削的研究成果进行了系统综述，分别介绍了陶瓷材料的去除机理和陶瓷加工领域的一些新型磨削方式。     

Integrity of grinding face-gear with worm wheel

Aiming at the issue of the grinding integrity of face-gear with worm wheel, the envelope mathematical model of shaper, worm wheel and face-gear is established based on theories of differential geometry and gear mesh. The judgment of completely grinding the face-gear with the avoidance of singularities is established, and the mathematical expression to show the reason why singularities appear is derived, through the research on the surface contact area and singularity rules of the worm thread surface. The disadvantage of current face-gear grinding method that only part of the working surface of the face-gear can be covered is analyzed and the influence of coefficient of judgment is studied through changing the design parameters.     

工程陶瓷材料精密磨削加工技术的新发展

随着材料科学技术的进步,有关硬脆材料以及各种增韧、增强新型复合材料的精密、超精密磨削加工技术和材料表面成形技术成为当今世界各国研究的热点.文章介绍了陶瓷材料的结构和力学特性,陶瓷材料磨削机理和当前各种先进的精密磨削加工方法和超声磨削方法,为陶瓷材料加工的进一步发展提供了依据.     

工程陶瓷材料精密磨削加工技术的新发展

随着材料科学技术的进步,有关硬脆材料以及各种增韧、增强新型复合材料的精密、超精密磨削加工技术和材料表面成形技术成为当今世界各国研究的热点.文章介绍了陶瓷材料的结构和力学特性,陶瓷材料磨削机理和当前各种先进的精密磨削加工方法和超声磨削方法,为陶瓷材料加工的进一步发展提供了依据.     

Thermo-mechanical properties of bowl-shaped grinding wheel and machining error compensation for grinding indexable inserts

In order to meet the technical requirements of grinding the circumferential cutting edge of indexable inserts, thermo-mechanical properties of bowl-shaped grinding wheel in high speed grinding process and the influence of dimension variations of the grinding wheel on machining accuracy were investigated. Firstly, the variation trends of the dimension due to centrifugal force generated in different wheel speeds were studied and the effect of stress stiffening and spin softening was presented. Triangular heat flux distribution model was adopted to determine temperature distribution in grinding process. Temperature field cloud pictures were obtained by the finite element software. Then, dimension variation trends of wheel structure were acquired by considering the thermo-mechanical characteristic under combined action of centrifugal force and grinding heat at different speeds. A method of online dynamic monitoring and automatic compensation for dimension error of indexable insert was proposed. By experimental verification, the precision of the inserts satisfies the requirement of processing.     

Regeneration of grinding wheel active surface using high-pressure hydro-jet

The possibility of applying a high-pressure hydro-jet for renewal of the grinding wheel cutting ability was presented. This work was conducted in the internal cylindrical grinding process of the Titanium Grade 2 alloy, which belongs to the group of hard-to-cut materials. The analysis shows that the impact on the erosion effectiveness of the grinding wheel active surface （GWAS） depends upon the hydro-jet inclination angle and working pressure. Experimental results reveal that application of hydro-jet working pressure of 25 MPa allows for effective cleansing of the grinding wheel surface. Depending on the initial GWAS condition and the level of its smearing with chips of machined material, it is possible to increase the number of grinding wheel unevenness apexes by as much as 4.5 times.