本文選題：冷軋 + 潤滑�。� 參考：《北京科技大學(xué)》2015年博士論文

【摘要】：金屬冷軋時(shí)為了達(dá)到減少摩擦磨損、降低能耗以及提高軋件表面質(zhì)量等目的,通常在其過程中采用適當(dāng)?shù)臐櫥ｋS著工業(yè)技術(shù)的不斷發(fā)展,各行各業(yè)對(duì)軋制板帶的需求不斷增大,質(zhì)量要求也越來越高,而高效率和高精度的產(chǎn)品要求使得軋機(jī)的非穩(wěn)態(tài)潤滑問題更為突出,這種失穩(wěn)現(xiàn)象不僅影響軋件的板厚精度和表面形貌,甚至可能導(dǎo)致斷帶或設(shè)備損傷,帶來巨大的經(jīng)濟(jì)損失。 軋制過程中軋件發(fā)生塑性變形的同時(shí)潤滑液由軋輥與軋件攜帶不斷從輥縫間流過,軋制過程是一個(gè)瞬態(tài)的不斷變化的過程,任何細(xì)微的擾動(dòng)都有可能使軋制潤滑系統(tǒng)處于一種非穩(wěn)定狀態(tài),特別是高速軋制狀態(tài)下非穩(wěn)態(tài)問題會(huì)增多,其宏觀表現(xiàn)為軋機(jī)振動(dòng),而隨著生產(chǎn)力及生產(chǎn)效率的提高,高速軋制將會(huì)成為一種趨勢(shì),因此有必要對(duì)軋制界面非穩(wěn)態(tài)潤滑特性進(jìn)行理論研究。本文以軋制理論、流體力學(xué)理論及振動(dòng)理論為基礎(chǔ),對(duì)冷軋過程中穩(wěn)態(tài)軋制潤滑界面及非穩(wěn)態(tài)軋制潤滑界面展開了一系列理論研究和數(shù)值分析,主要內(nèi)容包括： 1)根據(jù)軋制潤滑實(shí)際情況,建立了包括入口區(qū)在內(nèi)的穩(wěn)態(tài)軋制界面流體潤滑、混合潤滑模型,并對(duì)其在不同工況條件下進(jìn)行數(shù)值計(jì)算仿真。 2)建立了考慮表面形貌因素影響的包括流體潤滑、混合潤滑狀態(tài)在內(nèi)的非穩(wěn)態(tài)軋制界面潤滑模型,通過理論推導(dǎo)引入新的擾動(dòng)因素并進(jìn)行相應(yīng)的數(shù)值計(jì)算仿真。以穩(wěn)態(tài)軋制界面潤滑模型為基礎(chǔ),提出非穩(wěn)態(tài)軋制界面評(píng)價(jià)體系,對(duì)非穩(wěn)態(tài)條件下軋制壓力、油膜厚度等特性參數(shù)波動(dòng)進(jìn)行分析與評(píng)價(jià)。 3)以二輥實(shí)驗(yàn)軋機(jī)為平臺(tái)進(jìn)行了鋁合金板帶材軋制潤滑實(shí)驗(yàn)。將實(shí)驗(yàn)數(shù)據(jù)與理論分析值進(jìn)行了對(duì)比驗(yàn)證,結(jié)果表明理論計(jì)算所得結(jié)果與實(shí)驗(yàn)結(jié)果之間趨勢(shì)一致,數(shù)值上滿足一定精度要求,從而驗(yàn)證了理論分析的正確性。 4)以非穩(wěn)態(tài)軋制界面微觀應(yīng)力分布為基礎(chǔ),建立軋機(jī)垂直振動(dòng)及扭轉(zhuǎn)振動(dòng)模型,對(duì)不同擾動(dòng)因素、不同工況下軋機(jī)宏觀振動(dòng)進(jìn)行仿真與分析。
[Abstract]:In order to reduce friction and wear, reduce energy consumption and improve the surface quality of workpiece, proper lubrication is usually used in cold rolling. With the continuous development of industrial technology, the demand for rolling plate and strip is increasing in various industries, and the quality requirement is becoming higher and higher. The unsteady lubrication problem of rolling mill is more prominent due to the high efficiency and high precision product requirements. This kind of instability not only affects the thickness accuracy and surface morphology of rolled pieces, but also may lead to strip breakage or equipment damage and bring huge economic losses. During the rolling process, the plastic deformation of the workpiece occurs and the lubricating fluid flows through the gap between the rolls by the roller and the workpiece, so the rolling process is a transient and changing process. Any slight disturbance may cause the rolling lubrication system to be in an unstable state, especially in the high speed rolling condition, the unsteady problems will increase, its macroscopic performance is the rolling mill vibration, and with the increase of productivity and production efficiency, High speed rolling will become a trend, so it is necessary to study the unsteady lubrication characteristics of rolling interface. Based on the rolling theory, fluid dynamics theory and vibration theory, a series of theoretical research and numerical analysis on the stable rolling lubrication interface and the unsteady rolling lubrication interface during cold rolling are carried out in this paper. The main contents are as follows: 1) according to the actual conditions of rolling lubrication, a steady state rolling interface lubrication and mixed lubrication model including inlet region is established, and the numerical simulation is carried out under different working conditions. 2) the unsteady rolling interface lubrication model including fluid lubrication and mixed lubrication is established considering the influence of surface topography factors. A new disturbance factor is introduced through theoretical derivation and the corresponding numerical simulation is carried out. Based on the model of stable rolling interface lubrication, an evaluation system of unsteady rolling interface is proposed. The fluctuation of rolling pressure and oil film thickness under unsteady condition is analyzed and evaluated. 3) the lubrication experiment of aluminum alloy sheet and strip was carried out on the platform of two-high experimental mill. The experimental data are compared with the theoretical analysis results, and the results show that the theoretical results are consistent with the experimental results, and the accuracy of the theoretical analysis is satisfied numerically, which verifies the correctness of the theoretical analysis. 4) based on the micro-stress distribution of unsteady rolling interface, the vertical and torsional vibration models of rolling mill are established, and the macroscopic vibration of rolling mill under different disturbance factors and different working conditions is simulated and analyzed.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG331

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本文編號(hào)：1795814