OS1404 焼嵌めで精成されたセラミックス製スリーブと鋼製軸の焼外し過程における熱応力の検討(OS14-1 圧電材料・セラミックス・傾斜機能材料の弾性数理解析,OS-14 弾性数理解析の発展と新展開1)

概要

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Steel conveying rollers used in hot rolling mills must be exchanged frequently at great cost because hot conveyed strips induce wear and deterioration on the surface of roller in short periods. In this study, new roller structure is considered which has a ceramics sleeve connected with two short steel shafts at both ends by shrink fitting. Here, the ceramics sleeve may provide a longer life and reduces the cost for the maintenance. However, after used for a period the steel shaft has to be pulled out for exchange. Simply, heating outside surface and cooling inside surface of the shaft are necessary for separation. However, attention should be paid to the maximum thermal stress of the ceramics sleeve in the process of separation. In this paper, finite element method analysis is applied to the structure and thermal stress has been calculated with the varying dimensions of the structure. Also several effects on thermal stress have been investigated, such as the effect of shrink fitting ratio, outside diameter, the fitted length, thickness of shaft, materials and so on. Finally the most appropriate thermal conditions to reduce maximum stress and make separation easy have been discussed which is very use full for designing of new rollers.
一般社団法人日本機械学会の論文
2011-07-16