Abstract

Analysis of product quality after metal processing by pressure often showed that one cannot obtain high quality surface using cold rolling, running, dragging and other similar processes. It is related to the tool-billet interaction optimization without considering variable friction along with transient wave and auto-oscillatory processes. To substantiate the role of longitudinal and transverse wave processes, a simulation model has been developed, which models the billet surface layers as a beam on elastic base loaded by abruptly applied tangential forces that frequently exceed their critical values. Using mathematical models, we investigated the billet dynamical instability conditions, in which the surface layer integrity failed under stresses and strains exceeding their critical values. The results obtained allows one to determine hazardous states of the billet surface layers when an abrupt load is applied during the initial moments of the billet capture and also at the end of the tool-billet slipping during their motion velocities equalization.

中文翻译：

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波和自激振荡过程中材料压力处理过程中的瞬态模式研究

摘要

通过压力金属加工后的产品质量分析通常表明，使用冷轧，轧制，拖动和其他类似工艺无法获得高质量的表面。它与工具-钢坯相互作用的优化有关，而没有考虑可变摩擦以及瞬态波和自激振动过程。为了证实纵向波和横向波过程的作用，已开发了一个仿真模型，该模型将坯料表面层建模为弹性基体上的梁，该梁通过突然施加的切向力（经常超过其临界值）加载。使用数学模型，我们研究了坯料动力不稳定性条件，其中在应力和应变超过其临界值的情况下，表层完整性失效。