共查询到19条相似文献,搜索用时 140 毫秒
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液体磁性磨具光整加工技术是用磨具本身的流变特性对工件表面进行光整加工的新技术.在实际加工试验研究的基础上,分析了磁场强度、工件转速、加工时间工艺参数对加工表面质量的影响规律;为进一步研究液体磁性磨具的加工机理和加工装置的改进提供了依据. 相似文献
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液体磁性磨具光整加工机理的研究 总被引:5,自引:0,他引:5
液体磁性磨具是一种面向精密光整的新技术。从组成、加工机理和实验三个方面对液体磁性磨具进行了阐述。实验结果表明,用液体磁性磨具对零件表面进行光整加工可以达到满意的效果。 相似文献
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液体磁性磨具光整加工的流体动力学模型研究 总被引:1,自引:0,他引:1
液体磁性磨具是利用磁致相变原理研制的新型光整用具。参考了国内外相关研究之后,建立了液体磁性磨具光整加工的流体动力学数学模型,并用有限元分析软件ANSYS中的CFD模块-FLOTRAN,对液体磁性磨具加工中的流场(速度场)和剪切应力进行了数值模拟,该结果与理论模型取得了较好的一致。 相似文献
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为解决TC4钛合金材料难加工问题,采用液体磁性磨具对TC4钛合金进行了表面加工试验。通过调整工艺参数,采用田口方法对TC4钛合金液体磁性磨具光整加工的工艺参数进行优化。采用单因素试验法,研究磨料类型、磨料粒径、工件转速和电流强度等工艺参数对液体磁性磨具光整加工TC4钛合金材料加工性能的影响,并总结各工艺参数对工件表面粗糙度的影响规律。根据信噪比的望大特性分析得出,在液体磁性磨具光整加工TC4钛合金材料的加工过程中,当使用2 000目的白刚玉,主轴转速为500 r/min,电流强度为1.5 A加工时,工件表面粗糙度相对下降率%ΔRa达到了86.10%。液体磁性磨具光整加工TC4材料表面的最优工艺参数组合为:2 000目的白刚玉,主轴转速为700 r/min,电流强度为2.0 A。同时得出各工艺参数对工件表面粗糙度相对下降率%ΔRa的影响大小依次为:磨料类型磨料粒径工件转速电流强度。当采用2 000目的白刚玉配置的磨料进行加工时,工件的表面粗糙度Ra达到了0.096μm。采用液体磁性磨具光整加工技术可以有效地降低TC4钛合金材料的表面粗糙度和提升其工件表面加工质量,显著改善了传统加工方式中存在的烧蚀和烧伤现象。 相似文献
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液体磁性磨具表面光整加工技术是工件与液体磁性磨具在外加磁场作用下,产生较高的剪切应力特性实现表面加工的技术。磁场发生装置的特性对磨具的配置、加工效率、加工质量等均有重要影响。因此阐述了磁场发生装置的基本要求和设计方法,并用有限元分析软件进行了分析。其加工质量高、形状适应性强、材料适应范围广已在实验中得到鉴证。 相似文献
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纳米磁性液体材料在光整加工中的应用研究 总被引:1,自引:0,他引:1
磁性液体材料是一种特殊的新型材料,是由磁性纳米微粒(一般要求小于10 nm)均匀弥散于某种液体基液中所构成的稳定体系.磁性液体光整加工是利用磁性液体的流动性和磁性来保持磨料与工件之间产生相对运动,从而达到光整工件的精加工方法.根据磁性液体的典型特性,研究了用于磁性液体光整加工的磨削机理,阐述了磁性液体光整加工特点,介绍了实现磁性液体光整加工的方法. 相似文献
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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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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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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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An internal magnetic abrasive finishing process using a pole rotation system was proposed to produce highly finished inner surfaces of workpieces used in critical applications. Previous research found that the process incorporating one of the characteristic behaviors of the abrasive, the jumbling of the abrasive, results in aggressive contact of the abrasive against the inner surface, disturbing the smooth surface finish. The aim of this paper, therefore, is to characterize the in-process abrasive behavior against the surface and its effects on the finishing characteristics and to describe the finishing mechanism. The magnetic force acting on the magnetic abrasive, controlled by the field at the finishing area, is considered the primary influence on the abrasive behavior against the inner surface of the workpiece. This study examines the relationships between the magnetic field, the force on the abrasive, and the abrasive behavior. The surface roughness and material removal measurements resulting from finishing experiments demonstrate the effects of the abrasive behavior on the surface modifications. This paper also proposes a method to monitor the in-process abrasive behavior to facilitate processing. 相似文献
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提出一种新型的磁性复合磨粒化学机械抛光技术。该技术利用磁性聚合物微球与SiO2磨粒组成的复合磨粒抛光液,在辅助磁场的作用下,实现了一种磨粒尺寸与硬质抛光盘微观形貌依赖性小、材料去除率较高的抛光工艺。建立直径8 mm、高度不等的稀土钕铁硼永磁体以点阵形式组合形成的4类辅助磁场。仿真计算表明,柱状下凹磁极的磁场磁力HdH/dz分布均匀,磁性微球受到的磁力一致性好。对磁性微球在抛光系统中的受力分析表明,磁性微球受到的磁力有助于复合磨粒从近抛光区域进入抛光区域,磁性复合磨粒能以二体磨损的方式划擦去除加工表面。以表面粗糙度Ra 0.5μm的硬质抛光盘进行硅片抛光试验,施加辅助磁场前后,硅片的材料去除率从66 nm/min提高到179 nm/min,硅片表面粗糙度由抛光前Ra 405.860 nm减小到Ra 0.490 nm。 相似文献
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针对大型模具曲面精整加工的问题,探讨采用磁性研磨加工模具曲面的工艺。根据磁性研磨加工原理,基于数控铣床研制了磁性研磨实验装置,采用工具旋转的磁性研磨加工方式,磁性磨料受到磁场约束力和离心力的作用,成为影响加工过程正反两方面的因素。对模具曲面进行磁性研磨加工实验,针对模具曲面研磨量不均匀问题,分析了影响曲面研磨量的主要因素,提出了从磁极形状和研磨轨迹等方面控制研磨量的方法。 相似文献
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