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非光滑帶鋼在粗糙軋輥平整軋制過程中表面微觀形貌的轉印行為與演變規律

Transfer behaviors and evolution of surface micromorphology of non-smooth strip in temper rolling process with rough roller

  • 摘要: 針對平整軋制過程不同用途帶鋼對表面微觀形貌的特殊要求,在批量跟蹤電火花毛化軋輥、磨削軋輥和冷軋后帶鋼表面微觀形貌的基礎上,建立工作輥與帶鋼都可考慮真實表面粗糙峰的帶鋼表面微觀形貌軋制轉印生成模型,采用工業實驗驗證了仿真模型的準確性,并據此模型分析軋制前帶鋼已經具有表面粗糙度分別大于、等于、小于軋輥表面粗糙度時,帶鋼表面微觀形貌的軋制轉印行為與遺傳演變規律。提出了負轉印和轉印飽和的概念,定義了兩種極限軋制轉印狀態的描述指標— —負轉印最大和轉印飽和,研究發現當帶鋼表面粗糙度小于或等于軋輥表面粗糙度時,存在負轉印最大點和轉印飽和點;當帶鋼表面粗糙度大于軋輥表面粗糙度時,負轉印最大點和轉印飽和點重合。在此基礎上,采用負轉印最大點與轉印飽和點對應的臨界板寬軋制力,描述帶鋼表面微觀形貌的遺傳及演變規律,并系統仿真分析帶鋼屈服強度、帶鋼軋前表面粗糙度、軋輥表面粗糙度等工藝條件參數對于負轉印最大點與轉印飽和點對應的臨界單位板寬軋制力的影響規律,發現隨著帶鋼屈服強度增大和軋輥表面粗糙度增加,該臨界單位板寬軋制力均增大;隨著帶鋼表面粗糙度增大,負轉印最大點對應的臨界單位板寬軋制力增大,但轉印飽和點對應的臨界單位板寬軋制力卻減小。

     

    Abstract: To meet special requirements and respond to control problems of surface micromorphology of different strips in skin rolling process, a rolling transfer generation model of the surface micromorphology contact between work roll and actual rough surface of strip was established on the basis of batch tracing the surface micromorphology of electric discharge textured roll, grinding roll and cold rolled strip. The inheritance and evolution of surface micromorphology of the strip was analyzed based on the generation model and the accuracy of the generation model was verified by industrial experiments. The concepts of negative transfer and transfer saturation were proposed, and the descriptive indicators for two extreme rolling transfer status (the maximum negative transfer and transfer saturation) were defined. When strip surface roughness is equal to or less than that of roll, a maximum negative transfer point and transfer saturation point exist, while when strip surface roughness is greater than that of roll, the maximum negative transfer point is in superposition with the transfer saturation point. Under the above precondition, through the rolling force of critical strip width, which corresponds to the maximum negative transfer point and transfer saturation point, the inheritance and evolution of surface micromorphology of the strip were characterized. The effect of strip yield strength, strip surface roughness, and roll surface roughness on the rolling force of critical strip width corresponding to maximum negative transfer point and transfer saturation point were also analyzed. Results show that with the increase of strip yield strength and roll surface roughness, the rolling force of critical strip width corresponding to maximum negative transfer point and transfer saturation point increases. With the increase of strip surface roughness, the rolling force of critical strip width corresponding to maximum negative transfer point increases, and the rolling force of critical strip width corresponding to transfer saturation point decreases.

     

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