本文關鍵詞： 軋機 連續(xù)軋制 自激振動 穩(wěn)定性 臨界軋制速度　出處：《機械工程學報》2017年12期 　論文類型：期刊論文

【摘要】：軋機是典型的結構與工藝相互耦合的復雜動力學系統(tǒng),在內源反饋激勵作用下驅動能量在某種條件下被轉換為結構的振動能量而引起自激振動。軋制速度既是生產效能的直接衡量指標,也是觸發(fā)軋機振動失穩(wěn)的關鍵因素,因此對臨界軋制速度的研究對于預測和抑制自激振動的產生具有重要意義。考慮軋制界面的等效彈塑性剛度,建立某薄板軋制六輥軋機的8自由度非對稱結構模型,基于平面應變假設運用SLAB理論計算法建立軋制過程模型,通過軋制力計算值和實測值的比較對模型有效性進行驗證,并運用TALOR展開得到力能參數(shù)的增量模型,從而建立結構-工藝相耦合的動力學模型。通過對模型的LAPLACE變換得到S域特征方程,應用ROUTH穩(wěn)定性準則得到系統(tǒng)的失穩(wěn)條件以及產生自激振動的速度閾值,分析工藝參數(shù)對其影響規(guī)律,并進而提出工藝規(guī)程的制訂及優(yōu)化途徑。將計算分析結果與生產現(xiàn)場實際情況相結合,對軋制過程升速階段和勻速運行階段的典型振動現(xiàn)象及抑制策略進行仿真再現(xiàn),并從臨界軋制速度與自激失穩(wěn)振動的關系對其進行解釋。研究結果表明臨界軋制速度是評價軋機振動及軋制穩(wěn)定性的重要指標,通過連軋機架間的壓下規(guī)程配比和工藝條件優(yōu)化可以提高臨界軋制速度,從而實現(xiàn)薄板軋機的高速穩(wěn)定軋制。
[Abstract]:Rolling mill is a typical complex dynamic system which is coupled with process and structure. The driving energy is converted to the vibration energy of the structure under some conditions under internal feedback excitation, which causes self-excited vibration. Rolling speed is not only a direct measure of production efficiency, but also a key factor to trigger the vibration instability of rolling mill. Therefore, the study of critical rolling speed is of great significance for prediction and suppression of self-excited vibration. Considering the equivalent elastic-plastic stiffness of rolling interface, an 8-DOF asymmetric structure model of a six-high rolling mill for thin plate rolling is established. Based on the assumption of plane strain, the rolling process model is established by using SLAB theory. The validity of the model is verified by comparing the calculated value of rolling force with the measured value, and the incremental model of force and energy parameter is obtained by TALOR expansion. The characteristic equations in S domain are obtained by the LAPLACE transformation of the model, and the instability conditions of the system and the velocity threshold of the self-excited vibration are obtained by using the ROUTH stability criterion. The influence of process parameters on the process parameters is analyzed, and the formulation and optimization of process rules are put forward. The results of calculation and analysis are combined with the actual conditions of production site. The typical vibration phenomena and suppression strategies of rolling process in the stage of increasing speed and running at uniform speed are simulated and reproduced. The relationship between the critical rolling speed and the self-excited instability vibration is explained. The results show that the critical rolling speed is an important index to evaluate the rolling mill vibration and rolling stability. The critical rolling speed can be improved by optimizing the ratio of rolling schedule and technological conditions between the stand of continuous rolling mill, and thus the high speed and stable rolling of thin plate mill can be realized.
【作者單位】： 北京科技大學機械工程學院;
【基金】：2014國家智能制造裝備發(fā)展專項課題“高精度面板智能化冷連軋生產線” 國家自然科學基金(51175035) 北京高校青年英才計劃(YETP0367) 中央高�；究蒲袠I(yè)務費(FRF-BR-14-006A)資助項目
【分類號】：TG333.72

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