Development of a new mirror finishing process for the inner surface of capillary tube of 50〜100 micrometers in diameter by the application of magnetic field assisted machining

毛细管用于微型机械、微型医疗机械等。然而，目前还没有一种加工技术能够完成高达0.3μm Rz的内表面粗糙度。在本研究中，我们关注的是应用磁磨料精加工技术来创造微米管的精密内精加工技术。本研究的结果如下：1。实验建立了内磁场辅助微米管精加工工艺，制作了磁性工具并进行了精加工实验。加工力是由永磁体与直径为0.1mm的琴丝工具之间的磁力作用于微米管的内表面。建立了通过调节磁铁与微米管表面的距离来控制钢琴线刀加工力的实验装置。本研究采用平面功进行模型实验，假设管的曲率半径为无穷大。结果表明，表面粗糙度由0.14μm Rz提高到0.09μm Rz.2。利用永磁体对微米管内表面进行精加工的高频振动工具的研制及精加工行为的分析。制作了实验装置，并选用内径为2mm的微米管。精加工力通过外部永磁体作用于磁铁工具。此外，利用电磁场使磁性工具进行高频振动运动是一种新的加工方法。观察了振动刀具的精加工行为。线圈励磁电流与电磁工具幅值的关系。阐明了刀具振幅与磁铁与刀具距离的关系。表面粗糙度由15.6μm Rz提高到0.15μm Rz。

The capillary are used to micro-machines and micro-medical treatment machines, etc. However, there is not a processing technology which is able to finish up to 0.3μm Rz roughness of the internal surface. In this research, we pay attention to the creation of the precise internal finishing technology for micron tubes by the application of the magnetic abrasive finishing. The results of this research are as follows.1.The experimental setup of a internal magnetic field assisted finishing process for a micron tube, production of magnet tool and finishing experimentThe machining force is acted on the micron tube internal surface by the magnetic force between a permanent magnet and 0.1mm diameter piano wire tool. We made an experimental setup which the machining force acting on the piano wire tool could be controlled by adjusting the distance between a magnet and micron tube surface. In this study, a model experiment was carried out using a plane work to assume the curvature radius of tube to be infinity. The finishing characteristics were examined, and the surface roughness has been improved from 0.14μm Rz to 0.09μm Rz.2.Development of a high frequency vibration tool-for the finishing the internal surface of a micron tube using a permanent magnet and the elucidation of finishing behaviorThe experimental setup was produced, and a micron tube of 2mm inside diameter is used. The finishing force is acted to the magnet tool by an external permanent magnet. Moreover, it is a new processing method which gives the high frequency vibrating movement to the magnet tool by the electromagnetic field. The finishing behavior of the vibration tool was observed. The relation between coil excitation current and amplitude of magnet tool,. and the relation of the amplitude of the tool and the distance between magnets and the tool was clarified.. The surface roughness has been improved from 15.6μm Rz to 0.15μm Rz by this process.