【摘要】：塑性變形界面廣泛存在于金屬塑性成形中，此時工件、模具和潤滑劑構(gòu)成了一個復雜的摩擦學系統(tǒng)。論文研究了混合潤滑狀態(tài)下塑性變形界面微凸體平坦化行為，以期更好地理解塑性成形中工件表面形貌的演化和界面摩擦行為，為產(chǎn)品表面質(zhì)量和界面摩擦性能的控制提供理論依據(jù)。 基于機械流變模型和ISO25178三維表面參數(shù)，研究了微凸體平坦化引起的表面形貌變化的表征問題。運用圖像數(shù)學形態(tài)學處理技術(shù)，有效地實現(xiàn)了封閉潤滑油坑特征和基于機械流變模型的三維表面形貌參數(shù)的提取，以及真實接觸面積比的確定。 采用有限元法，建立了模具與工件粗糙表面接觸模型，分析了接觸壓力、基體塑性應變、界面摩擦和微凸體角度等因素對微凸體平坦化的影響。結(jié)果表明，真實接觸面積比隨著基體塑性應變和接觸壓力的增加而增加；界面滑動摩擦有利于微凸體平坦化，但其促進效應無法與基體塑性應變和接觸壓力相比；微凸體平坦化阻力隨著其角度的增加而增加，但增加趨勢逐漸減緩。鋁材壓縮實驗結(jié)果證明了有限元模擬的有效性。 分別在有、無潤滑條件下進行了不同表面紋理結(jié)構(gòu)的1050鋁材平面應變壓縮實驗；對表面形貌進行了測量和分析，研究在不同載荷和基體應變條件下微凸體平坦化行為和表面形貌結(jié)構(gòu)的變化；基于封閉潤滑油坑演化和微凸體平坦化行為的關(guān)聯(lián)性分析，來理解靜態(tài)有潤滑接觸條件下表面紋理結(jié)構(gòu)對微凸體平坦化行為的影響；采用ISO25178三維表面參數(shù)和基于機械流變模型的三維表面參數(shù)，對工件表面形貌進行了表征，來描述微凸體平坦化引起表面形貌的變化。 在自制的塑性成形摩擦測試裝置上進行了帶材拉伸實驗，來研究滑動接觸條件下不同紋理結(jié)構(gòu)表面的微凸體平坦化行為、表面形貌結(jié)構(gòu)變化以及界面摩擦特性。實驗結(jié)果顯示，摩擦系數(shù)表現(xiàn)出壓力和速度的依賴性，且與封閉潤滑油坑的演化相關(guān)聯(lián)。研究了算術(shù)平均偏差、最快衰減自相關(guān)長度、表面紋理特征比、表面展開面積比和表面均方根斜率等三維表面參數(shù)隨名義接觸壓力和拉伸速度的變化�；跈C械流變模型，分析了潤滑機制、微凸體平坦化引起表面形貌變化、載荷承載機理和界面摩擦特性間的內(nèi)在聯(lián)系，從而揭示了微凸體平坦化行為對界面摩擦的影響；并探討了最大封閉空面積比表征界面摩擦性能的有效性。 在考慮塑性變形界面封閉潤滑油坑中潤滑劑陷入和逃逸行為的條件下，分別建立了靜態(tài)和滑動有潤滑接觸過程中規(guī)則表面微凸體平坦化的理論模型，分析了接觸條件對微凸體平坦化的影響，并初步驗證了微凸體平坦化模型的有效性。 提取封閉潤滑油坑特征，并分析封閉潤滑油坑的演化和三維表面形貌參數(shù)與混合潤滑狀態(tài)下微凸體平坦化行為的關(guān)聯(lián)性，是本論文的主要創(chuàng)新之處。論文研究結(jié)果對產(chǎn)品表面質(zhì)量和界面摩擦性能的控制有理論指導意義。
[Abstract]:The plastic deformation interface is widely present in the metal plastic forming, at which time the workpiece, the mould and the lubricant form a complicated tribology system. In this paper, the flat behavior of the micro-convex body of the plastic deformation interface under the mixed lubrication condition is studied, with a view to better understanding the evolution of the surface morphology of the workpiece and the interface friction behavior in the plastic forming, and provide the theoretical basis for the control of the surface quality of the product and the friction performance of the interface. Based on the mechanical rheological model and the three-dimensional surface parameters of ISO25178, the characterization of the surface morphology changes caused by the planarization of the micro-convex bodies is studied. In this paper, the characteristics of closed lubricating oil pit and the extraction of three-dimensional surface topography parameters based on the mechanical rheological model and the actual contact area ratio are effectively realized by using the image mathematical morphology processing technique. The contact model of the rough surface of the die and the workpiece is established by using the finite element method. The contact pressure, the plastic strain of the matrix, the interface friction and the angle of the micro-convex body are analyzed. The results show that the real contact area ratio is increased with the increase of the plastic strain and the contact pressure of the matrix; the sliding friction of the interface is favorable to the planarization of the micro-convex bodies, but the effect of the promotion is not related to the plastic strain and the contact pressure of the matrix The flattening resistance of the micro-convex body increases with the increase of the angle, but the trend is increased by one-by-one. The results of the aluminum compression test prove the finite element simulation. The planar strain compression experiments of 1050 aluminum material with different surface texture structures were carried out under the condition of free and no lubrication, and the surface morphology was measured and analyzed, and the planarization behavior and surface morphology of the micro-convex bodies under different load and matrix strain conditions were studied. The influence of the surface texture on the planarization behavior of the micro-convex body under the condition of static lubrication contact is understood based on the relationship between the evolution of the closed lubricating oil pit and the planarization behavior of the micro-convex body, and the three-dimensional surface parameters of ISO25178 and the three-dimensional model based on the mechanical rheological model are adopted. The surface morphology of the workpiece is characterized by the surface parameters of the workpiece to describe the surface of the surface of the micro-convex body. The change of morphology was carried out on the self-made plastic forming friction test device. The flat behavior of the micro-convex bodies on the surface of different texture structures under the sliding contact conditions and the change of the surface morphology were studied. The experimental results show that the coefficient of friction shows the dependence of pressure and velocity and is related to the sealing of the lubricating oil. The three-dimensional surface parameters such as the arithmetic mean deviation, the fastest attenuation self-correlation length, the surface texture characteristic ratio, the surface area ratio and the surface root mean square slope are studied with the nominal contact pressure and the nominal contact pressure. Based on the mechanical rheological model, the relationship between the surface morphology, the load bearing mechanism and the interface friction characteristics of the micro-convex body is analyzed based on the mechanical rheological model, and the flat behavior of the micro-convex body is revealed. The influence of interface friction is discussed and the maximum closed space ratio representation interface is also discussed. In this paper, the theoretical model of the smoothing of the micro-convex bodies of the regular surface in the process of lubrication and contact is established under the condition that the lubricant is trapped and the escape behavior of the lubricating oil pit is closed by the plastic deformation interface, and the contact conditions are analyzed. The influence of the planation of the micro-convex bodies and the preliminary verification of the micro-convex bodies the method comprises the following steps of: extracting the characteristics of a closed lubricating oil pit, and analyzing the relationship between the evolution of the closed lubricating oil pit and the flattening behavior of the micro-convex body under the mixed lubrication state, This paper is the main innovation of this paper. The results of the paper have a good effect on the surface quality and the interface friction.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TH117

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