金屬加工表面形貌之摩擦特性研究; Study of Friction Characteristic on Shape of Metal Machining Surface

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題名:	金屬加工表面形貌之摩擦特性研究;Study of Friction Characteristic on Shape of Metal Machining Surface
作者:	凌國夏;Kuo-Hsia Ling
貢獻者:	機械工程研究所碩士在職專班
關鍵詞:	接觸角;表面粗糙度;表面形貌;田口實驗設計;磨耗量;摩擦係數;Friction coefficient;contact angle;Taguchi method;surface roughness;wear quantity;surface shape;abrasive jet machining(AJM)
日期:	2009-06-26
上傳時間:	2009-09-21 11:54:21 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	在製程技術中，工具機是最主要的核心關鍵設備，然而工具機床台與滑軌在長時間運轉下會因磨耗的產生而形成間隙，當間隙存在時會使得床台在啟動瞬間產生跳動及在實際加工時容易因震動而造成精度失真。為避免床台與滑軌滑動面磨耗過快，所以滑動面的潤滑油膜持久性、摩擦係數及耐磨性等評估項目亦顯重要。本研究主要探討在金屬表面不同形貌的油槽形狀（油溝、油坑）及表面粗糙度（Ra6.3、Ra3.2、Ra1.6）的條件下，其表面接觸角、摩擦係數及磨耗量的差異並利用田口實驗設計選擇出摩擦係數最低的最適組合及其運用。由實驗結果證明出接觸角的大小受到表面粗糙度及表面形貌的影響，一般而言接觸角會隨得表面粗糙度變大而增加，但在相同表面粗糙度之下，因為磨料噴射加工法所造成的表面凹坑形貌較隨機且不規則，使得油膜不易擴散，造成其接觸角與銑削表面相比之下略有差異。經由摩擦特性實驗（滑動距離：100m）觀測試片對磨後的表面狀態與分析實驗結果得知，利用磨料噴射加工出的油坑形貌表面Ra1.6能獲得最低的摩擦係數μ＝0.07，經田口實驗設計分析其影響摩擦係數的重要性排序為：表面粗糙度>表面形貌>負載壓力>滑動速度>潤滑油量。在長距離磨耗實驗（滑動距離：1000m）中，磨料噴射加工在工件表面產生的大量凹坑發揮了儲油功能使潤滑油膜不易破裂，及因凹坑所產生的微嶺高可在對磨中快速的被磨平，產生可以支撐負載的絕佳滑動面，因而降低摩擦係數及磨耗量。 Machine tool is the major key kernel equipment in process technology. Wearing clearance will occurred between table and slide of machine tool after long time operation. The clearance will cause vibration in the start instantaneous and influence the accuracy of machining. To avoid quick wearing between table and slide, valuation items such as wear resistance, Friction Coefficient and persistent of lubricant film, are important. Examine under different shape of oil slot(oil groove, oil hollow) and surface roughness(Ra6.3, Ra3.2, Ra1.6), the difference between surface contact angle, Friction Coefficient and wear quantity, and choose the best combination of minimum Friction Coefficient and its application by Taguchi method. From the result of experiment, we find the contact angle is influenced by surface roughness and surface shape. Contact angle is increased with surface roughness, but under the same surface roughness, the surface shape produced by abrasive jet machining(AJM) method is random and irregular, and result to the difference between contact angle and machining surface. By watching the surface of specimen after wear test(wear distance: 100m), oil hollow shape surface(Ra1.6) by abrasive jet machining(AJM) method will get the lowest Friction Coefficient (μ=0.07), the importance of influence of Friction Coefficient after analyzed by Taguchi method is: surface roughness>surface shape>loading pressure>sliding speed>lubricant volume. Long distance wear test(wear distance: 100m) under same lubricant volume and same parameter, oil hollow on the surface of specimen produced by abrasive jet machining(AJM) has the function of keep the oil and make the oil film difficult to break. Micro hill produced by oil hollow will be lapped, and produce the best sliding surface of loading and lower the Friction coefficient.
顯示於類別:	[機械工程學系碩士在職專班 ] 博碩士論文

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