磁力电解复合抛光中电解液的选配

磁力电解复合抛光工艺在难加工材料的精加工中被广泛使用,电解液的选配是影响该工艺的一个重要因素。文中对磁力电解复合抛光工艺中电解液的选配进行了研究,对磁力电解复合抛光中电解液的基本要求进行了分析,对常见电解液的性能进行了归纳和比较,并根据抛光过程中电解液的使用,得出了磁力电解复合抛光中电解液的选配原则。     

硬质合金的电解磨削镜面加工试验

电解磨削加工优于机械研磨、电解抛光和电解磨料复合加工，适用于内外国磨削、平面磨削、成形磨削。尤其对硬质含金、高速钢、不锈钢、钛合金、镍合金、纯铁等高强度、高硬度、热敏性和磁性等难加工材料的工件表面，可将粗磨、精磨、镜面加工连续进行，将加工前粗糙度为Ra63～1．6μm的工件表面直接电解磨削至Rao.025Pm以下的镜面。本文介绍硬质含金的电解磨削镜面加工试验。一、试验实例1．试件材料、尺寸及初始粗糙度试件材料为国产YT15硬质合金，被磨平面尺寸为20×60（mm2）（厚10．5mm），初始表面粗糙度为Ra1．6μm。2磨床、磨轮及…     

电解机械复合抛光试验及其过程分析

通过研究工艺试验中的表面粗糙度和去除量随时间变化的关系,以及切屑微粒的形貌的提取分析,证明电解机械复合抛光的效率高于纯机械抛光和纯电解抛光,而且在其他工艺条件相同时可以获得更低的极限表面粗糙度值,但是在获得同样表面粗糙度时,复合加工单位面积去除的材料更多。切屑和加工后表面形态显示电解作用主要在工件表面的凸起棱边上,这正是复合加工较机械加工的优势所在。     

球形磁性磨料磁力研磨ZrO2材料机理研究

在磁力研磨加工ZrO 2材料过程中,分析了单颗磁性磨料在加工区域内的受力情况,并对研磨压力的形成进行探讨,利用公式推导计算研磨压力,通过研磨压力的大小分析了磁力光整加工中材料的去除机理,包括脆性断裂去除、塑性变形去除和粉末化去除。通过白光干涉仪、扫描电子显微镜等分析检测仪器对磁力研磨加工后的工件表面进行检测,可知在其他条件相同时,磁力研磨加工后的工件材料精度高于传统的草轮抛光精度,可达到0.59μm。     

电解磁力研磨技术

随着科学技术的飞跃发展,对零件的表面光整加工和棱边精加工提出越来越高的要求。在国内外精加工领域中?人们正在通过各种渠道,借助于多种能量形式,探索新的工艺途径。 电解磁力研磨加工工艺是将电化学加工复合到磁力研磨工艺上,适合于高强度、高硬度和高韧性等难加工材料的表面和棱边光整加工的新颖工艺。 本文在开发研制电解磁力研磨工艺装置的基础上,论述了电解磁力研磨加工原理和加工过程中各因     

S136不锈钢电解机械复合抛光

为了解决S136不锈钢机械抛光和电化学抛光存在的效率低、质量差、污染大等问题而进行电解机械复合抛光的研究。根据S136不锈钢的化学特性,使用新型电解液,结合高频窄脉冲电源对其进行电解机械复合抛光实验,通过调整加工参数,使不锈钢工件的表面粗糙度降低到Ra0.08μm。与其它抛光方式相比,该方法具有污染小、成本低、效率高、加工质量好等优点。     

巴氏合金模具的机械电解复合抛光研究

针对具有复杂曲面的巴氏合金模具的难抛光，低效率等问题，在数控机床上将电解加工和机械抛光相复合，对模具型腔进行高效抛光，获得了良好的表面质量，由于采用CAD／CAM技术，保证了加工精度，提高了加工效率，文中探讨了数控机床机械电解复抛光的机理，并分析了抛光结果。     

磁场作用下磁性抛光液体的抛光特性及实验研究

介绍了一种基于旋转磁性抛光液体的抛光技术。磁性抛光液体在磁力搅拌器的作用下产生旋转运动,利用外加强磁场作用增大磁性液体的粘度和剪切屈服应力,当加工工件放入磁性抛光液体中,磁性抛光液体与之相接触的工件表面发生磨削,从而达到对工件表面的光整加工。实验详细研究了磁性抛光液体抛光后工件的抛光区内表面粗糙度与抛光时间和位置之间的关系,实验结果表明:旋转磁性抛光液体抛光可以用于对工件进行超光滑加工,抛光时间越长,各处粗糙程度越接近,表面粗糙度越好,并且表面粗糙度比单独用研磨抛光膏的效果好。     

磁场方向往复变化的磁力电解复合抛光头的研制

为了提高磁力电解复合抛光的效果和效率,通过分析磁力电解复合抛光机理,施加了一个和电场方向平行且能往复变化的磁场,并设计了一种新型的磁力电解复合抛光头。通过实验表明,这种抛光头能方便地安装在数控机床上,并能有效地提高磁力电解复合抛光的效果和效率。     

磁研法在模具曲面中的抛光机理与技术研究

针对目前模具自由曲面抛光过程的难加工问题.按照模具曲面抛光要求,结合电磁场理论,提出采取磁性的磨料,通过磁场中磁力的作用实现对模具自由曲面型腔抛光加工的新工艺.从磁力研磨的加工特点着手,对抛光工艺过程的主要参数进行分析,并对磁力研磨运动轨迹的规划和生成进行探讨,提出自由曲面磁力研磨时获取均匀表面去除的方法.     

Design and fabrication of a novel polishing tool for finishing freeform surfaces in magnetic field assisted finishing (MFAF) process

Surface finish is a critical requirement for different applications in industries and research areas. Freeform surfaces are widely used in medical, aerospace, and automobile sectors. Magnetic field assisted finishing process can be used very efficiently to finish freeform surfaces. In this process, magnetorheological fluid is used as the polishing medium and permanent magnet is used to control its rheological properties to generate finishing force during polishing. To avail sufficient magnetic field in the finishing zone, it is necessary to design an optimum polishing tool. In the present study, a specially designed polishing tool is designed using a finite element based software package (Ansys Maxwell^®) based on Maxwell equations. At first, dimension of the permanent magnet is determined for designing optimum tool geometry. After that, dimension and configuration of the magnet fixture are optimized. A special type of metal named mu-metal which is a nickel-iron based alloy is selected for magnet fixture due to its magnetic-field shielding property. Mu-metal directs the magnetic flux lines in such a way that in the finishing zone the magnetic flux can be concentrated on the workpiece surface required for finishing. Also, the Mu-metal magnet fixture shields the magnetic field from outside environment so that MR fluid as well as any surrounding magnetic materials do not stick to the polishing tool. Experiments are carried out to validate the Maxwell simulation results to compare the magnetic flux distribution on the workpiece surface which shows good agreement between them. Also, finishing of flat titanium workpieces are carried out and it is found that the novel polishing tool has the capability to finish the workpieces in the nanometer range.     

电解研磨精密加工

电解研磨精密加工方法是把电解加工和研磨加工结合起来,利用中性电解液,通以适当的电流密度,在磨料研磨和电解溶解共同作用下,对零件进行快速、高效的精密加工,使表面粗糙度可达到R_z0.01-0.02μm。这种加工方法适于一般碳钢,不锈钢,钛合金钢等零件的精密加工。本文阐述电解溶解和磨料研磨结合精密加工的效果,表面粗糙度形成机理和实验结果。     

Electrochemical mechanical polishing technology: recent developments and future research and industrial needs

Electrochemical mechanical (ECM) polishing processes are widely used in various industries such as die and mould manufacturing, turbine blades, and components with complex surfaces. They are used to improve the surface quality and get glossy surfaces with enhanced mechanical properties. In this paper, the authors first look into the fundamental principles of the ECM polishing technology. Then the main parameters that affect the ECM polishing process such as applied voltage, electrolyte concentration, rotational speed and polishing pressure are discussed, and the related research issues are raised. Studying these parameters will enhance the performance, increase the efficiency of ECM polishing technology and provide a useful reference for further developments. Up to date, automatic ECM polishing is limited for planarization process and surfaces with simple geometry such as hole-wall and rotary surfaces. In addition, in some of ECM finishing technologies, the limited available working space usually forces the manufacture to machine one part in multiple stages. Because robots have some advantages over conventional machines such as flexibility, low price and mechanical reconfigurability, they are an effective and economical solution for ECM polishing of geometrically complex workpieces. In order to advance the ECM technology for the next competitive stage where a promising quantitative and qualitative processing is required, the authors proposed that the future researches on ECM polishing should also include ECM polishing using robots. In addition, the authors propose several configurations and setups of robotic ECM polishing systems. The research topics in this area should include designing of new ECM polishing tools, investigating the synergistic effects of additional sources of energies such as magnetic field and ultrasonic vibrations besides the normal effect of ECM tools and developing models and control methods of the processes.     

In-situ deflectometic measurement of transparent optics in precision robotic polishing

In the ultra-precision manufacturing of large optics, industrial robots have the potential to become an intelligent and economical choice of surface polishing. However, the transport of the workpieces between the polishing platform and the measurement instrument seriously limits the manufacturing efficiency. Therefore, an in-situ measurement system based on the monoscopic deflectometry is developed to determine the form quality of the optical lenses during rough polishing. Stray light reflected from the lower surface of transparent lenses may degrade the measuring quality, thus an effective absolute phase retrieval algorithm is developed to decouple the superposed fringes associated with the upper and lower surfaces. Then, the form of the upper surface under polishing can be reconstructed to guide the subsequent polishing. Experimental results demonstrate that the accuracy of the method is comparable to that of the coordinate measuring machine, consequently the manufacturing efficiency and reliability of large optical workpieces can be greatly improved.     

磁性液体研磨加工机理

在以前研究的基础上,改磁性液体悬浮研磨为流性液体堆积研磨,并在研磨中附加振动,大大地提高了加工效率和加工精度,加工出表面粗糙度只有Ra0.005～0.006μm的钢试件和Ra0.005～0.010μm的铜试件表面。还就这种新研磨方法中各种因素的影响以及其研磨作用机理进行了深入的研究探讨。     

Effect of extrusion pressure and number of finishing cycles on surface roughness in magnetorheological abrasive flow finishing (MRAFF) process

Magnetorheological abrasive flow finishing (MRAFF) was developed as a new precision finishing process for complicated geometries using smart magnetorheological polishing fluid. This process introduces determinism and in-process controllability of rheological behaviour of abrasive laden medium used for finishing intricate shapes. Magnetorheological polishing (MRP) fluid is comprised of carbonyl iron powder and silicon carbide abrasives dispersed in a viscoplastic base of grease and mineral oil and exhibits change in rheological behaviour in presence of external magnetic field. This smart behaviour of MRP fluid is utilized to precisely control finishing forces. The process performance in terms of surface roughness reduction depends on process variables like hydraulic extrusion pressure, magnetic flux density in the finishing zone, number of finishing cycles, and composition of MRP fluid. In the present work, experiments were conducted on a hydraulically powered MRAFF experimental setup to study the effect of extrusion pressure and number of finishing cycles on the change in surface roughness of stainless steel grounded workpieces. A new observation of “illusive polishing” action with the initial increase in number of finishing cycles is reported. The actual finishing action is possible only after removal of initial loosely held material remaining after grinding.     

介电泳效应磨粒流抛光中的电极形态

针对薄壁陶瓷工件内表面抛光，提出一种基于介电泳效应的磨粒流抛光方法。将非均匀电场布置于陶瓷工件外表面，极化磨粒，实现陶瓷工件内表面高效抛光。仿真分析发现:电极间隙比为2时，SiC磨粒具有最好的介电泳效应，参与抛光的磨粒最多。陶瓷工件初始内表面粗糙度值Ra为(208±5)nm时，抛光10 h后，无介电泳效应的磨粒流抛光工件内表面粗糙度值Ra为51 nm，有介电泳效应的磨粒流抛光工件内表面粗糙度值Ra为23 nm。     

不锈钢电解—机械复合抛光新工艺的研究

在电解加工和机械研磨的基础上，把电解阳极溶解与合成纤维无纺布上所粘结磨料的研磨有机地结合起来，试验了一种新的不锈钢电解机械复合抛光法，并总结了较合理的工艺参数，不锈钢表面的短时间的抛光加工后，表面光洁度可接近镜面。     

机械轴与虚拟轴复合的磁流变抛光

传统的磁流变抛光工艺采用抛光缎带的固定位置对工件进行法向加工,由于机床转轴的行程限制,工件陡度较高区域不可达,当前基于等效磁场原理的变切触点抛光方法存在着等效磁场实现成本高,没有充分发挥机械轴与虚拟轴相结合的抛光能力等问题。本文针对这些问题提出了一种用于加工高陡度曲面元件的方法,分析了保证去除函数稳定的磁场特点,通过磁场测量实验验证了磁场的稳定范围,通过采斑实验确定了去除函数稳定的虚拟轴范围为±12°,提出了将虚拟轴与机械轴复合使用的加工方法,并基于刚体变换实现了该加工方法下的坐标解算。最后,通过增加倾角的球面件抛光实验,将球面元件95%口径的PV值收敛为0.096λ,RMS值收敛为0.012λ,实验结果表明虚拟轴和机械轴复合抛光方法具有针对高陡度曲面的修形能力。