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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10627
標題: | 整合微型氣靜壓軸承之微型氣動加工具系統之設計開發與性能研究 Design and Research of Micro Pneumatic Machining System Integrated with Aerostatic Bearings |
作者: | Guan-Chung Ting 丁貫中 |
指導教授: | 黃光裕(Kuang-Yuh Huang) |
關鍵字: | 微型氣動加工具,雙動力氣渦輪,氣靜壓軸承,模組化,整合動力量測, Micro pneumatic machining tool,Twin-powered air turbine,Aerostatic bearing,Modularization,Compound dynamic measurement, |
出版年 : | 2010 |
學位: | 碩士 |
摘要: | 氣動鑽具系統具有高速、低耗能和低發熱量等優點,被廣泛的使用於工具機、牙醫器械等領域中。要提升加工效能與提高轉速,必須依賴低摩擦和少振動的軸承。
本論文設計開發新式整合氣靜壓軸承之微型氣動加工具系統,微型氣動加工具系統採用本實驗室台灣微動公司共同開發的雙動力微小氣渦輪,以串聯配置的方式來提高氣體動力之轉換。氣渦輪轉子之軸承則設計開發具有低摩擦力和少振動的氣靜壓軸承,用於軸向和徑向軸承承載,精密的進氣溝槽也可以以較容易加工的方式完成。為了提升高硬度材料加工之效能,本論文整合軸向振動驅動裝置和旋轉氣動加工具。 整體系統由動力、軸承、夾持和振動驅動四個主要子系統構成,以模組化結構設計,易於改造和維修。系統設計開發以現有微小氣渦輪葉扇為核心,逐步完成概念設計和實體設計之流程。 整體系統之性能透過理論分析和有限元素法模擬,探討設計和操作參數對轉速、扭力矩和承載力等性能之影響,並找出最佳設計參數。在實驗測試則專注於轉速、扭力矩、承載力和切削力等主要性能。 設計開發完成之氣動加工具實體,於供氣壓力 狀態下,最高轉速為 ,最大扭力約為 ;刀具夾持力平均為 ;引入超音波振動之情況下,對AISI304材質之最大切削量達到 ;開發之氣靜壓軸承實體也可同時提供低摩擦之徑軸向承載功能。 Because of advantages such as high-speed operation, low-energy consumption and low-heat emission, pneumatic drilling systems are widely used in the fields of machining tools and dental equipments. In order to further increase their working speed and efficiency, they must rely on efficient bearings with low-friction and less-vibration. In this thesis, a new type of micro pneumatic machining system integrated with aerostatic bearing is designed and developed. A serial configuration of “Twin-Powered Micro Turbine”, which is co-developed by the Precision Engineering Laboratory of NTU and MicroP Technology (Taiwan) Inc., is applied to enhance the energy transformation efficiency. And the high-speed rotor shaft is axially and radially supported by our developed aerostatic bearings, which can provide a low-friction and less-vibration operation. In order to improve the machining performance on hard materials, an axial vibration device is also applied to integrate with the rotational drilling device. The whole system consists of power, bearing, clamping and vibration subsystems, which are modular constructed for convenient maintenance and modification. The systematic design approach begins with the core-element: micro turbine, and the conceptual and embodiment designs are progressively accomplished. Through theoretical analysis and finite-element-method, the influences of the design and operational parameters on its system performances such as rotational speed, torque and bearing capacity are studied. Besides, the analyses are used to optimize the design parameters. And the experimental tests are also focused on the system performances and the cutting efficiency. By the supply pressure of 4.0 bar for the turbine, the developed micro pneumatic machining system achieves a maximum rotational speed of 280 krpm and a maximum torque of 6.05 Nmm. And the average clamping force for machining tool can reach 6.05 kgf. Through the integration with the axial ultrasonic vibration, its cutting capability on the stainless steel achieves about 26 mg/min and is 1.5 times higher than that without axial ultrasonic vibration. The aerostatic bearings also perform their low-friction bearing capacities for the turbine. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10627 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 機械工程學系 |
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ntu-99-1.pdf | 31.67 MB | Adobe PDF | 檢視/開啟 |
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