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Simulation of roughness and surface texture evolution at macroscopic scale during cylinder honing process

机译:气缸珩磨过程中宏观尺度粗糙度与表面纹理演化的仿真

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摘要

The honing process produces surface liners with specific functional properties. Engine performances and life expectancy are directly impacted by the quality of honed surface. The form quality, the roughness and the surface appearance manufactured by honing determine the friction of the piston in the liner. The process is however mechanically complex and the selection of the process parameters is currently based on empirical methods. The aim of this paper is thus to develop a macroscopic simulation environment which will help end-users during this setting-up stage. The development of this virtual tool is based on a space-time discretization and a macroscopic cutting model taking into account local contacts between the workpiece and the abrasive stones. The space-time discretization allows representing the machine environment including the tool, the workpiece and the machine kinematics. The cutting model allows converting kinematics and abrasive contacts in dynamic data and material removal rate by calculation. The cutting model is initially adjusted based on simple experiments. The stock removal equation is then extrapolated to the whole range of stone cutting conditions. This approximation allows simulating the real process and a whole honing cycle. Results are validated by comparison with industrial context experiments. The simulation of the whole honing cycle allows predicting the form quality, one of the roughness criteria and the surface appearance. Moreover, simulation results are represented by means of maps that allow looking at quality criteria for each point of the surface.
机译:珩磨过程产生具有特定功能性的表面衬垫。发动机性能和预期寿命直接受到珩磨表面质量的影响。通过珩磨制造的形式质量,粗糙度和表面外观决定了衬里中活塞的摩擦。然而,该过程是机械复杂的,并且对过程参数的选择目前基于经验方法。因此,本文的目的是开发宏观模拟环境,这将有助于在此设置阶段期间的最终用户。该虚拟工具的开发基于时空离散化和宏观切割模型,考虑工件和磨料结石之间的局部接触。时空离散化允许代表包括工具,工件和机器运动学的机器环境。切割模型允许通过计算在动态数据和材料去除率中转换运动学和磨料触点。最初根据简单的实验调整切割模型。然后将股票去除方程推断到整个石材切割条件范围内。这种近似允许模拟真实过程和整个珩磨周期。通过与工业背景实验进行比较验证了结果。整个珩磨循环的模拟允许预测形式质量,粗糙度标准之一和表面外观。此外,仿真结果通过映射来表示,允许为表面的每个点看质量标准。

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