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    旋轉超聲端面銑削(RUFM)工藝方法是一種高效的脆性材料加工方法,本文提出將其應用于光學玻璃的平面加工。通過對壓痕斷裂力學理論、脆性材料的材料去除特性和金剛石磨粒運動學原理的分析,建立了脆性材料RUFM去除模型。在此基礎上,開展了RUFM和K9鉆石銑加工光學玻璃的對比試驗。掃描電子顯微鏡(SEM)觀察兩種加工方式的表面形貌顯示:與傳統的K9鉆石銑加工方法相比,RUFM以較小的碎屑完成材料去除,具有較小的徑向裂紋和側向裂紋尺寸。亞表面損傷磁流變拋光斑點檢測的結果表明:RUFM可以更有效地降低光學玻璃加工亞表面損傷深度。理論和試驗研究表明,RUFM工藝方法是光學玻璃等脆性材料的有效加工方法。
    Rotary ultrasonic face milling (RUFM), an effective processing method for brittle materials, was introduced into fiat surface machining of optical glass. A material removal model was presented for RUFM based on the analysis of the indentation fracture mechanics theory, the material removal characteristics of brittle materials and the kinematics and dynamics of diamond grits. And the surface properties given by RUFM and diamond milling of K9 glass were compared. The surface topographies observed by a scanning electron microscopy(SEM)show that the sizes of radial cracks,lateral cracks and chipping with RUFM are smaller than with traditional processing. Subsurface damage observations of optical glass show that RUFM more effectively reduces the subsurface damage depth than traditional processing as determined by the magnetorheological finishing spots test method. This theoretical and experimental research shows that RUFM provides effective processing method for brittle materials such as optical glass.
     
     
    高速大噸位起重機大量用于制造業、港口運輸業和建筑業,目前是以人工操作為主,自動化程度低。為了有效解決實現起重機自動化的關鍵技術問題,建立了回轉塔式起重機實驗臺,用于研究起重機動力學和控制策略的有效性。回轉塔式起重機實驗臺由回轉機構和變幅機構組成,模擬回轉塔式起重機的變幅運動和回轉運動。本文確定了回轉塔式起重機實驗臺的總體結構方案以及變幅運動和回轉運動的傳動方案。建立對實現起重機自動化,提高工作效率、安全性價值。研究結果表明這一實驗臺的、可靠性有著重要的意義和價值。
    High-speed and big-tonnage cranes are widely used in manufacturing, harbor-transportation and construction,but most of the cranes are operated manually with low automatization. To cope with the key technical problems and realize the automation, we set up an experimental system for rotary tower cranes so that the validity of crane dynamics and proposed control strategies could be experimented. The experimental system consists of a rotary mechanism and a luffing mechanism and is used for the simulation of luffing motion and rotating motion of rotary tower cranes. We designed not only the overall scheme for the frame of this system,but also the scheme for transmission of luffing motion and rotating motion. It is concluded that the erection of this system is valuable and significant for the crane in its automatization,efficiency, safety and reliability.

     
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