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首页> 外文期刊>Journal of thermal stresses >ROLE OF THE MOLD PROPERTIES ON GAP NUCLEATION IN SOLIDIFICATION
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ROLE OF THE MOLD PROPERTIES ON GAP NUCLEATION IN SOLIDIFICATION

机译：模具性能对凝固中间隙成核的作用

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摘要

The role of the mold properties on gap nucleation in pure metal solidification is investigated. The mold is assumed to he finite and deformable, and has a sinusoidal surface micro-geometry. Unlike previous models, the model developed herein assumes that the mold material has a non-negligible thermal capacitance. Of particular interest are the roles played by the mold thickness and mold thermal capacitance on the existence of critical mold surface wavelength that corresponds to the situation where both contact pressure and its time derivative simultaneously fall to zero. The present work also assumes that the thermal and mechanical problems in the mold-shell interface are uncoupled. It is shown that the inclusion of the thermal capacitance of the mold material, together with thermal capacitance of the shell and the mold distortion, may be sufficient to predict a critical wavelength beyond which no gap nucleation occurs at the troughs. The role of the mold properties is examined through qualitative comparisons of the present and previous models. Gap nucleation times, associated mean shell thicknesses, and critical wavelengths are calculated for pure copper and pure iron molds under identical process conditions. It is found that a copper mold leads to faster gap nucleation compared to an iron mold. The associated critical wavelengths of iron molds are shown to be larger than those of copper. An optimum mean mold thickness corresponding to the longest gap nucleation time for a given set of process parameters is determined. The effect of the mean pressure on the optimum mold thickness is also investigated.
机译：研究了模具性能对纯金属凝固中间隙成核的作用。模具被认为是有限的和可变形的，并且具有正弦表面微观几何形状。与以前的模型不同，本文开发的模型假定模具材料具有不可忽略的热容。特别令人关注的是模具厚度和模具热容量在模具表面临界波长存在时所起的作用，该临界波长对应于接触压力及其时间导数同时降至零的情况。当前的工作还假定模具壳接口中的热问题和机械问题是不相关的。结果表明，模具材料的热电容，壳体的热电容和模具变形都可能足以预测临界波长，超过该临界波长，槽中不会出现间隙成核。通过对现有模型和先前模型进行定性比较，研究了模具性能的作用。在相同的工艺条件下，可以计算出纯铜和纯铁模具的间隙成核时间，相关的平均壳厚度和临界波长。已经发现，与铁模具相比，铜模具导致更快的间隙成核。铁模具的相关临界波长显示为大于铜的临界波长。对于给定的一组工艺参数，确定对应于最长间隙成核时间的最佳平均模具厚度。还研究了平均压力对最佳模具厚度的影响。

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