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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Influence of tooth passing frequency, feed direction, and tool overhang on the surface roughness of curved surfaces of hardened steel
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Influence of tooth passing frequency, feed direction, and tool overhang on the surface roughness of curved surfaces of hardened steel

机译：齿的通过频率，进给方向和工具伸出量对淬硬钢曲面的表面粗糙度的影响

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摘要

The task of milling hardened steel with complex-shaped surfaces (e.g., for dies and molds) differs from that of traditional milling. The tool is usually long with a small diameter, and therefore vibrates easily. Its trajectory must follow the surface shape, causing its effective diameter in contact with the workpiece to change as the cutter travels along the surface. Consequently, cutting speed also varies, which may affect tool life and surface roughness. Since the tool is not rigid, the tooth passing frequency, which is the main frequency of the cutting forces, may be close to the natural frequency of the tool, often leading to high vibration and even chatter. This study seeks to contribute to a better understanding and use of this type of process. Several experiments were performed, using tool overhang, lead angle, tooth passing frequency and feed direction as input variables. Three cutting force components and surface roughness were measured throughout the experiments, and the tool's frequency response functions for the two tool overhang lengths used in the experiments were calculated to better analyze the results. The main conclusion was that feed direction was the input variable that most affected surface roughness, since the use of descendant milling led to lower variations in radial force, and hence, less vibration.
机译：铣削具有复杂形状表面的淬硬钢（例如，用于模具）的任务与传统铣削的任务不同。该工具通常较长且直径较小，因此容易振动。它的轨迹必须遵循表面形状，导致其与工件接触的有效直径随着刀具沿表面行进而改变。因此，切削速度也会变化，这可能会影响刀具寿命和表面粗糙度。由于工具不是刚性的，因此切削力的主要频率即通过齿的频率可能接近于工具的固有频率，通常会导致较高的振动甚至颤振。这项研究旨在有助于更好地理解和使用这种类型的过程。使用工具悬伸，导程角，齿通过频率和进给方向作为输入变量进行了几次实验。在整个实验过程中测量了三个切削力分量和表面粗糙度，并计算了实验中使用的两个工具悬垂长度的工具频率响应函数，以更好地分析结果。主要结论是进给方向是影响表面粗糙度的输入变量，因为使用后代铣削可减小径向力的变化，从而减少振动。

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