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首页> 外文期刊>Journal of engineering materials and technology >An Approximate Method of Estimating the Yield of a Strip Under Tension Cut by Serrated Surfaces on Opposite Faces
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An Approximate Method of Estimating the Yield of a Strip Under Tension Cut by Serrated Surfaces on Opposite Faces

机译：估算锯齿面相对面上张力剪切时带钢屈服的近似方法。

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In view of the well-known disparity between predictions from temper rolling models and measured values from rolling mills, there is a need to obtain a better understanding of the effect of roll asperities on the yielding characteristics of the rolled strip. This paper models a roll with asperities as a rigid body with a regular serrated surface and the rolling process as an indentation, and uses the plane strain model and slip-line theory to determine the critical pressure that is required to yield the strip throughout the thickness beneath the tips of the asperities. The strip is also under lateral tension at both ends. The emphasis of the paper is the effect of the lateral tension and the thickness of the strip on the critical pressure. For the case when the indenting surface has sharp teeth, the critical pressure can be found in close form. For the case when the indenting surface has blunt teeth, a robust approximate scheme for estimation of the critical values that does not require extensive computation is given and this scheme can be used in an on-line control process. It is found that when the tooth angle is smaller than a critical angle, the sharper the tooth, the lower the average critical pressure needed to make the strip yield. When the tooth angle is larger than the critical angle, then the blunter the tooth, the lower the pressure that is needed. The effect of the asperities is to reduce the critical pressure and it is found that this effect is more pronounced for thin strips than for thick strips. The lateral tension reduces the critical pressure further. These findings give some implications for the rolling of metal sheets.
机译：鉴于在调质轧制模型的预测与轧机的测量值之间的公知差异，需要更好地理解轧辊粗糙度对轧制带材屈服特性的影响。本文将具有凹凸形状的轧辊建模为具有规则锯齿状表面的刚体，并将压延过程作为压痕，并使用平面应变模型和滑移线理论来确定在整个厚度范围内产生带材所需的临界压力在粗糙的尖端之下。带材的两端也承受侧向拉力。本文的重点是侧向张力和带材厚度对临界压力的影响。对于压入表面带有尖锐齿的情况，临界压力可以紧密形式发现。对于压痕表面具有钝齿的情况，给出了一种无需进行大量计算即可估算出临界值的鲁棒近似方案，并且该方案可用于在线控制过程。已经发现，当齿角小于临界角时，齿越锋利，使带材屈服所需的平均临界压力越低。当齿角大于临界角时，齿越钝，所需的压力就越低。粗糙的影响是降低临界压力，并且发现这种影响对于薄条带比厚条带更明显。横向张力进一步降低了临界压力。这些发现为金属板的轧制提供了一些启示。

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