臺灣博碩士論文加值系統

鎢鋼具有高硬度、高強度、耐磨耗、耐腐蝕、耐熱高與不銹等特性，廣泛應用於五金、機械、化工，國防等行業，製作高精度高耐磨的關鍵零組件。鎢鋼的硬度極高而具有脆性，受外力衝擊容易斷裂。因此，尋求製程方式的改善、輔助切削的方法及較佳參數的組合等技術瓶頸突破，乃當前切削加工之重要課題。而改善鎢鋼切削性能、加工效率及刀具使用壽命等，長期以來更為相關業者共同追求的目標。
本文建構不同輔助磨削鎢鋼U型槽實驗，包含旋轉超音波輔助、雙軸超音波輔助及旋轉與雙軸超音波的混合輔助以驗證各輔助效果之差異及優劣。本實驗採用鑽石磨棒，透過加工製程參數（主軸轉速、徑向切深、進給速率）進行田口法直交表的調變規劃，針對鎢鋼進行磨削實驗。於實驗過程中，使用動力計監測切削力的變化，以工具顯微鏡觀測鎢鋼加工邊緣形貌，並以表面粗度儀進行表面粗糙度之量測等。最後，以加工完成之表面粗糙度為目標函數，同時受制於刀具壽命的拘束條件，配合田口品質法的望小特性求得最佳的製程參數。結果顯示，與無輔助相比，使用超音波輔助能夠獲得良好的表面粗糙度、切削力及邊緣形貌。低切深於超音波輔助下能有效排屑及降低切削熱等功效而獲得良好切削性能。旋轉與雙軸超音波混合輔助磨削，切削性能優於其他切削輔助，能改善加工表面粗糙度、切削力及邊緣形貌情況，故可證實旋轉與雙軸超音波混合輔助為本實驗最佳輔助方式。

 

Tungsten carbide has the characteristics of high hardness, high strength, good wear resistance, corrosion resistance, high heat resistance and rustless characteristics. It is widely used in iron-monger, machinery, chemical industry, national defense and other industries to produce the key components with high precision and high wear resistance. Tungsten carbide has extremely high hardness and brittleness, and it is easy to break under external impact. Therefore, it is an important issue for cutting processes to seek breakthroughs in technological obstacle such as improvement of process methods, methods of assistance cutting and combination of better parameters. Improvement of the cutting performance, machining efficiency and tool life for tungsten carbide has been a common goal pursued by related industries for a long time.
This study constructs different assisted cutting systems for U-groove grinding of tungsten carbide, including rotary ultrasonic, biaxial ultrasonic and hybrid assisted grinding to verify the differences and advantages of each assisted cutting system effect. Grinding experiments of tungsten carbide using a diamond electroplated burs were conducted by changing the cutting process parameters such as spindle speed, radial depth of cut and feed rate through a full-factor or Taguchi orthogonal array combination of the process parameters. Dynamometer is used to monitor the variation of cutting force. The morphology of the side-edge surface of tungsten carbide will be measured by tool-microscope off-line. Surface roughness measurement through a surface roughness instrument is also performed. Finally, the characteristics of nominal-the-best in Taguchi method are applied to determine the optimal or better combination of process parameters for tungsten carbide grinding in which machined surface roughness and cutting-tool life are used as object function and subjecting constraint, respectively. The results show that as compared with the without assistance, ultrasonic assistance can obtain good surface roughness, cutting force and side-edge surface morphology. Low cutting depth in ultrasonic assisted system can effectively remove grinding debris and reduce cutting heat to obtain good cutting performance. In the case of hybrid assisted grinding, cutting performance is better than other cutting systems which can effectively improve the surface roughness, cutting force and side-edge morphology of the machined surface. It may be confirmed that the hybrid assisted system is the best assisted method for Tungsten carbide grinding in this study.

中文摘要 ...........................................................i
英文摘要 ...........................................................ii
誌謝 ...........................................................iv
目錄 ...........................................................v
表目錄 ...........................................................vi
圖目錄 ...........................................................vii
第一章 前言........................................................... 1
1.1 研究背景 ...........................................................1
1.2 研究動機與目的................................................... 1
1.3 文獻回顧...................................................2
1.4 論文架構..................................................6
第二章 理論基礎 ...................................................7
2.1 鎢鋼材料特性...................................................7
2.2 磨削理論...................................................7
2.3 超音波輔助技術...................................................8
2.4 田口實驗方法...................................................9
第三章 實驗方法與規劃...................................................12
3.1 工件材料與刀具特性................................................13
3.2 實驗儀器設備與規格................................................14
3.3 實驗方法與執行步驟................................................24
第四章 結果與討論................................................27
4.1 表面粗糙度比較................................................27
4.2 切削力比較................................................33
4.3 鎢鋼邊緣形貌比較................................................36
第五章 結論與建議................................................42
參考文獻 ................................................43
附錄 ................................................46
Extended Abstract................................................78

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