共查询到19条相似文献,搜索用时 109 毫秒
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磁力研磨是利用磁性磨料和磁场作用进行研磨加工的一种研抛技术.讨论了不同研磨头形状对磁力研磨的影响以及研磨头设计的要点.在五自由度并联机床上利用不同形状磨头对自由曲面的模具进行了磁力研磨试验.开槽研磨头比不开槽研磨头的研磨效果要好得多.实验分析了利用球型磨头对工件磁力研磨时,磁场强度、研磨间隙、研磨时间等因素对自由曲面模具表面研磨质量的影响.利用五自由度并联机床不仅可以去除自由曲面模具表面的切削残留痕迹,降低模具的表面粗糙度,还可解决传统手工研磨方式所引起的工件研磨质量不一致的缺陷。 相似文献
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针对自由曲面光学玻璃研磨抛光存在的问题,提出通过数控技术结合化学磁性研磨技术来实现自由曲面光学玻璃的研磨抛光。应用正交试验设计对化学磁性研磨试验的4个因素进行研究,最终获得各个因素对于工件表面粗糙度影响的主次顺序,并确定其最优组合为:研磨时间60min,磁感应强度0.8T,研磨间隙1.0mm,磁极转速为3000r/min。 相似文献
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介绍了曲面磁性研磨光整加工的原理,提出了有效磨削的概念,设计和制作了曲面磁性研磨的磁场发生装置,并对磁性研磨加工的磁路结构、磁路及线圈进行了计算. 相似文献
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为了提高钛合金锥孔的研磨质量和研磨效率,提出了采用超声波振动辅助磁力研磨的复合加工方案。加工时,磨粒在磁场束缚下切削锥孔表面,并对其进行不断撞击,且因为磁场力、超声振动力和离心力等综合影响的原因,磨粒的切削轨迹呈现明显的多向性。针对钛合金锥孔,与传统磁力研磨法进行试验对比,并分析研磨后试件的材料去除量、表面粗糙度和表面形貌等来验证超声磁力复合研磨的效果。结果表明:超声磁力复合研磨加工效率得到提高;锥孔的材料去除量增加至1.6倍;研磨后锥孔平均表面粗糙度由原始的Ra1.23 μm降至Ra0.25 μm,下降率是传统工艺的1.3倍;试件表面的微波峰、凹坑和加工纹理均被去除,锥孔表面质量得到显著提高,且试件形状精度得到改善。 相似文献
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New iron-based SiC spherical composite magnetic abrasive for magnetic abrasive finishing 总被引:1,自引:0,他引:1
SiC magnetic abrasive is used to polish surfaces of precise, complex parts which are hard, brittle and highly corrosion-resistant in magnetic abrasive finishing(MAF). Various techniques are employed to produce this magnetic abrasive, but few can meet production demands because they are usually time-consuming, complex with high cost, and the magnetic abrasives made by these techniques have irregular shape and low bonding strength that result in low processing efficiency and shorter service life. Therefore, an attempt is made by combining gas atomization and rapid solidification to fabricate a new iron-based SiC spherical composite magnetic abrasive. The experimental system to prepare this new magnetic abrasive is constructed according to the characteristics of gas atomization and rapid solidification process and the performance requirements of magnetic abrasive. The new iron-based SiC spherical composite magnetic abrasive is prepared successfully when the machining parameters and the composition proportion of the raw materials are controlled properly. Its morphology, microstructure, phase composition are characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD) analysis. The MAF tests on plate of mold steel S136 are carried out without grinding lubricant to assess the finishing performance and service life of this new SiC magnetic abrasive. The surface roughness(Ra) of the plate worked is rapidly reduced to 0.051 μm from an initial value of 0.372 μm within 5 min. The MAF test is carried on to find that the service life of this new SiC magnetic abrasive reaches to 155 min. The results indicate that this process presented is feasible to prepare the new SiC magnetic abrasive; and compared with previous magnetic abrasives, the new SiC spherical composite magnetic abrasive has excellent finishing performance, high processing efficiency and longer service life. The presented method to fabricate magnetic abrasive through gas atomization and rapid solidification presented can significantly improve the finishing performance and service life of magnetic abrasive, and provide a more practical approach for large-scale industrial production of magnetic abrasive. 相似文献
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Ching-Tien Lin Lieh-Dai Yang Han-Ming Chow 《The International Journal of Advanced Manufacturing Technology》2007,34(1-2):122-130
This study employed magnetic abrasive finishing (MAF) to conduct free-form surface abrasion of stainless SUS304 material operations.
The operations were demonstrated using a permanent magnetic finishing mechanism installed at the CNC machining center. The
operations were performed using the Taguchi experimental design, considering the effects of magnetic field, spindle revolution,
feed rate, working gap, abrasive, and lubricant. Furthermore, the experimental data was collected using the Taguchi experimental
design. The optimal parametric conditions for processing stainless SUS304 material were applied in a two-stage process comprised
of rough finishing that involved MAF followed by a precise finishing of the surface. Prior to rough finishing, the Rmax value was 2.670 μm; after rough finishing, the value was 0.158 μm. Precise finishing yields an even lower value of 0.102 μm
similar to that of the mirror surface. Therefore, the results revealed that MAF provides a highly efficient way of obtaining
surface finish. 相似文献
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采用磁力研磨技术进行Al_2O_3-TiO_2陶瓷涂层的精密加工,设计了平面陶瓷研磨的试验装置,通过研究磨粒粒度等参数对表面粗糙度的影响规律,得出精密加工的最优参数。 相似文献
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Berhanu Girma M. V. G. S. Raghuram R. Balasubramaniam 《Machining Science and Technology》2013,17(3):323-340
Magnetic abrasive finishing (MAF) uses magnetic force of very low magnitude applied on ferromagnetic abrasive particles to obtain very high level surface finish. The process has been investigated extensively in the finishing of cylindrical surfaces. This paper reports an experimental work on the analysis of surface roughness and material removal using response surface method in the MAF of plane surfaces. The surface finish was found to improve significantly with an increase in the grain size, relative size of abrasive particles vis-à-vis the iron particles, feed rate and current. The optimum parameter levels which gave better surface finish and the higher material removal were also obtained from this experimentation. 相似文献
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S.C. Jayswal V.K. Jain P.M. Dixit 《The International Journal of Advanced Manufacturing Technology》2005,26(5-6):477-490
Magnetic abrasive finishing (MAF) is one of the advanced finishing processes, which produces a high level of surface quality and is primarily controlled by a magnetic field. In MAF, the workpiece is kept between the two poles of a magnet. The working gap between the workpiece and the magnet is filled with magnetic abrasive particles. A magnetic abrasive flexible brush (MAFB) is formed, acting as a multipoint cutting tool, due to the effect of the magnetic field in the working gap. This paper deals with the theoretical investigations of the MAF process. A finite element model of the process is developed to evaluate the distribution of magnetic forces on the workpiece surface. The MAF process removes a very small amount of material by indentation and rotation of magnetic abrasive particles in the circular tracks. A theoretical model for material removal and surface roughness is also proposed accounting for microcutting by considering a uniform surface profile without statistical distribution. Numerical experiments are carried out by providing different routes of intermittent motion to the tool. The simulation results are verified by comparing them with the experimental results available in the literature. 相似文献
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S.C. Jayswal V.K. Jain P.M. Dixit 《The International Journal of Advanced Manufacturing Technology》2005,26(5):477-490
Magnetic abrasive finishing (MAF) is one of the advanced finishing processes, which produces a high level of surface quality and is primarily controlled by a magnetic field. In MAF, the workpiece is kept between the two poles of a magnet. The working gap between the workpiece and the magnet is filled with magnetic abrasive particles. A magnetic abrasive flexible brush (MAFB) is formed, acting as a multipoint cutting tool, due to the effect of the magnetic field in the working gap. This paper deals with the theoretical investigations of the MAF process. A finite element model of the process is developed to evaluate the distribution of magnetic forces on the workpiece surface. The MAF process removes a very small amount of material by indentation and rotation of magnetic abrasive particles in the circular tracks. A theoretical model for material removal and surface roughness is also proposed accounting for microcutting by considering a uniform surface profile without statistical distribution. Numerical experiments are carried out by providing different routes of intermittent motion to the tool. The simulation results are verified by comparing them with the experimental results available in the literature. 相似文献
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Qing-lin Guo Ming Zhang 《The International Journal of Advanced Manufacturing Technology》2009,42(5-6):595-605
The magnetic pole is an important finishing tool in magnetic abrasive finishing (MAF). This study used finite element method to analyze magnetic field characteristics for three different magnetic poles such as solid cylindrical pole, hollow cylindrical pole, and hollow cylindrical pole with grooves design. The results showed that the hollow cylindrical with grooves can generate the better surface roughness in MAF. The operations were demonstrated using a permanent magnetic polishing mechanism installed at a CNC machining center. The operations were performed using Taguchi experimental design, considering the effects of magnetic field, pole rotational speed, feed rate, working gap, abrasive, and lubrication. The optimal parameter conditions was obtained after experimental data analysis, the quality surface roughness (R max = 0.1 mm) which is similar to a mirror surface was obtained after confirmatory tests. The optimal parameter conditions for material removal weight were also obtained in MAF. The results showed that MAF technique can meet customer requirement and raise the value-added products simultaneously. 相似文献
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V. K. Jain 《Machining Science and Technology》2013,17(3):257-294
The surface finishing techniques can be divided into two categories: traditional and advanced. To overcome some of the problems of traditional finishing techniques, hybridized processes have been evolved by the researchers. Some of the advanced finishing processes that have been reviewed are abrasive flow machining (AFM), magnetorheological finishing (MRF), magnetorheological abrasive flow finishing (MRAFF), magnetic abrasive finishing (MAF), chemo mechanical polishing (CMP), etc. Most of these processes have been developed in the recent past and they can be employed to produce optical, mechanical, and electronic components with micrometer or sub-micrometer form accuracy and surface roughness within nanometer range with hardly any surface defects. However for large size flat components, MAF seems to be the most suitable finishing process. In MAF, DC power supply is given to the electromagnet hence intermixing of ferromagnetic abrasive particles during the process does not take place and the worn out cutting edges keep interacting with the workpiece surface. As a result, the finishing rate is quite low. The use of pulsed DC power supply to the electromagnet results in pulsating flexible magnetic abrasive brush (P-FMAB), which substantially enhances the finishing rate. The on-line measurement of the forces has helped in understanding the mechanism of material removal during Static-FMAB (S-FMAB) and Pulsating-FMAB. The magnitude of normal magnetic force (originating indentations) in P-FMAB has been found to be dynamic in nature and substantially high in magnitude as compared to S-FMAB. 相似文献