混合润滑状态下塑性变形界面微凸体平坦化行为研究
发布时间：2019-02-26 19:03
【摘要】：塑性变形界面广泛存在于金属塑性成形中，此时工件、模具和润滑剂构成了一个复杂的摩擦学系统。论文研究了混合润滑状态下塑性变形界面微凸体平坦化行为，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为，为产品表面质量和界面摩擦性能的控制提供理论依据。 基于机械流变模型和ISO25178三维表面参数，研究了微凸体平坦化引起的表面形貌变化的表征问题。运用图像数学形态学处理技术，有效地实现了封闭润滑油坑特征和基于机械流变模型的三维表面形貌参数的提取，以及真实接触面积比的确定。 采用有限元法，建立了模具与工件粗糙表面接触模型，分析了接触压力、基体塑性应变、界面摩擦和微凸体角度等因素对微凸体平坦化的影响。结果表明，真实接触面积比随着基体塑性应变和接触压力的增加而增加；界面滑动摩擦有利于微凸体平坦化，但其促进效应无法与基体塑性应变和接触压力相比；微凸体平坦化阻力随着其角度的增加而增加，但增加趋势逐渐减缓。铝材压缩实验结果证明了有限元模拟的有效性。 分别在有、无润滑条件下进行了不同表面纹理结构的1050铝材平面应变压缩实验；对表面形貌进行了测量和分析，研究在不同载荷和基体应变条件下微凸体平坦化行为和表面形貌结构的变化；基于封闭润滑油坑演化和微凸体平坦化行为的关联性分析，来理解静态有润滑接触条件下表面纹理结构对微凸体平坦化行为的影响；采用ISO25178三维表面参数和基于机械流变模型的三维表面参数，对工件表面形貌进行了表征，来描述微凸体平坦化引起表面形貌的变化。 在自制的塑性成形摩擦测试装置上进行了带材拉伸实验，来研究滑动接触条件下不同纹理结构表面的微凸体平坦化行为、表面形貌结构变化以及界面摩擦特性。实验结果显示，摩擦系数表现出压力和速度的依赖性，且与封闭润滑油坑的演化相关联。研究了算术平均偏差、最快衰减自相关长度、表面纹理特征比、表面展开面积比和表面均方根斜率等三维表面参数随名义接触压力和拉伸速度的变化。基于机械流变模型，分析了润滑机制、微凸体平坦化引起表面形貌变化、载荷承载机理和界面摩擦特性间的内在联系，从而揭示了微凸体平坦化行为对界面摩擦的影响；并探讨了最大封闭空面积比表征界面摩擦性能的有效性。 在考虑塑性变形界面封闭润滑油坑中润滑剂陷入和逃逸行为的条件下，分别建立了静态和滑动有润滑接触过程中规则表面微凸体平坦化的理论模型，分析了接触条件对微凸体平坦化的影响，并初步验证了微凸体平坦化模型的有效性。 提取封闭润滑油坑特征，并分析封闭润滑油坑的演化和三维表面形貌参数与混合润滑状态下微凸体平坦化行为的关联性，是本论文的主要创新之处。论文研究结果对产品表面质量和界面摩擦性能的控制有理论指导意义。
[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.
【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TH117
本文编号：2431058
[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.
【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TH117
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