本文關(guān)鍵詞： 軋機(jī) 連續(xù)軋制 自激振動(dòng) 穩(wěn)定性 臨界軋制速度　出處：《機(jī)械工程學(xué)報(bào)》2017年12期 　論文類(lèi)型：期刊論文

【摘要】：軋機(jī)是典型的結(jié)構(gòu)與工藝相互耦合的復(fù)雜動(dòng)力學(xué)系統(tǒng),在內(nèi)源反饋激勵(lì)作用下驅(qū)動(dòng)能量在某種條件下被轉(zhuǎn)換為結(jié)構(gòu)的振動(dòng)能量而引起自激振動(dòng)。軋制速度既是生產(chǎn)效能的直接衡量指標(biāo),也是觸發(fā)軋機(jī)振動(dòng)失穩(wěn)的關(guān)鍵因素,因此對(duì)臨界軋制速度的研究對(duì)于預(yù)測(cè)和抑制自激振動(dòng)的產(chǎn)生具有重要意義�？紤]軋制界面的等效彈塑性剛度,建立某薄板軋制六輥軋機(jī)的8自由度非對(duì)稱(chēng)結(jié)構(gòu)模型,基于平面應(yīng)變假設(shè)運(yùn)用SLAB理論計(jì)算法建立軋制過(guò)程模型,通過(guò)軋制力計(jì)算值和實(shí)測(cè)值的比較對(duì)模型有效性進(jìn)行驗(yàn)證,并運(yùn)用TALOR展開(kāi)得到力能參數(shù)的增量模型,從而建立結(jié)構(gòu)-工藝相耦合的動(dòng)力學(xué)模型。通過(guò)對(duì)模型的LAPLACE變換得到S域特征方程,應(yīng)用ROUTH穩(wěn)定性準(zhǔn)則得到系統(tǒng)的失穩(wěn)條件以及產(chǎn)生自激振動(dòng)的速度閾值,分析工藝參數(shù)對(duì)其影響規(guī)律,并進(jìn)而提出工藝規(guī)程的制訂及優(yōu)化途徑。將計(jì)算分析結(jié)果與生產(chǎn)現(xiàn)場(chǎng)實(shí)際情況相結(jié)合,對(duì)軋制過(guò)程升速階段和勻速運(yùn)行階段的典型振動(dòng)現(xiàn)象及抑制策略進(jìn)行仿真再現(xiàn),并從臨界軋制速度與自激失穩(wěn)振動(dòng)的關(guān)系對(duì)其進(jìn)行解釋。研究結(jié)果表明臨界軋制速度是評(píng)價(jià)軋機(jī)振動(dòng)及軋制穩(wěn)定性的重要指標(biāo),通過(guò)連軋機(jī)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(shí)現(xiàn)薄板軋機(jī)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(xué)機(jī)械工程學(xué)院;
【基金】：2014國(guó)家智能制造裝備發(fā)展專(zhuān)項(xiàng)課題“高精度面板智能化冷連軋生產(chǎn)線” 國(guó)家自然科學(xué)基金(51175035) 北京高校青年英才計(jì)劃(YETP0367) 中央高�；究蒲袠I(yè)務(wù)費(fèi)(FRF-BR-14-006A)資助項(xiàng)目
【分類(lèi)號(hào)】：TG333.72

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 慔明;齒，

本文編號(hào)：1544682