本文關(guān)鍵詞： 軋制液 制備 納米添加劑 潤(rùn)滑模型　出處：《北京科技大學(xué)》2015年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：板帶鋼軋制生產(chǎn)向著連續(xù)化、自動(dòng)化、高效率、節(jié)能環(huán)保的方向發(fā)展,使軋制工藝潤(rùn)滑技術(shù)得到了前所未有的重視和應(yīng)用。隨著全球范圍內(nèi)能源危機(jī)和環(huán)境污染日趨嚴(yán)峻,對(duì)鋼鐵行業(yè)也提出了實(shí)行節(jié)能減排、清潔生產(chǎn)的要求。油基軋制潤(rùn)滑劑在使用過(guò)程中存在著操作環(huán)境惡劣、易腐敗變質(zhì)、油泥難處理等諸多問(wèn)題,而且難以滿(mǎn)足日漸苛刻的生產(chǎn)條件,因此水基軋制液受到越來(lái)越多的關(guān)注。水基軋制液的快速發(fā)展表現(xiàn)出優(yōu)良的冷卻性、清洗性、經(jīng)濟(jì)性和安全性等諸多優(yōu)點(diǎn),然而也存在著潤(rùn)滑性能不足、防銹性能差等問(wèn)題。為了解決油基軋制潤(rùn)滑劑及水基軋制液存在的上述問(wèn)題,需要對(duì)新型軋制潤(rùn)滑劑及軋制潤(rùn)滑理論進(jìn)行深入的研究。 隨著納米潤(rùn)滑技術(shù)的提出及發(fā)展為解決油基潤(rùn)滑劑存在的問(wèn)題和水基軋制液的缺點(diǎn)提供了新的思路。本文采用物理分散和化學(xué)分散相結(jié)合的方法實(shí)現(xiàn)了納米TiO2在水基體系中的穩(wěn)定分散,同時(shí)添加了其他水溶性的功能添加劑,按照一定工藝流程制備了適用于熱軋及冷軋的全新水基納米軋制液。通過(guò)摩擦學(xué)性能、潤(rùn)濕性能及黏度、軋制潤(rùn)滑性能、軋后表面質(zhì)量等方面對(duì)所制備的水基納米軋制液進(jìn)行了系統(tǒng)的綜合研究,為解決油基潤(rùn)滑劑存在的問(wèn)題提供了技術(shù)途徑和條件,對(duì)促進(jìn)軋制潤(rùn)滑技術(shù)和納米軋制液的發(fā)展具有十分重要的意義。 通過(guò)對(duì)全新水基納米軋制液摩擦學(xué)性能、摩擦磨損性能研究表明,添加納米TiO2明顯提高水基軋制液承載能力、降低摩擦系數(shù)和磨斑直徑,摩擦副磨損表面得到顯著改善。熱軋及冷軋潤(rùn)滑試驗(yàn)表明,使用水基納米軋制液能夠有效降低軋制力,改善軋后表面質(zhì)量；同時(shí),納米TiO2的添加提高了水基軋制液的緩蝕性能,冷軋板帶鋼退火清凈性?xún)?yōu)于乳化液。 通過(guò)Gleeble熱壓縮實(shí)驗(yàn)表明納米TiO2具有優(yōu)異的熱分解穩(wěn)定性和高溫潤(rùn)滑性能。根據(jù)理論計(jì)算分析及熱重實(shí)驗(yàn)結(jié)果進(jìn)一步表明納米TiO2在軋制過(guò)程中以固體顆粒狀態(tài)發(fā)揮潤(rùn)滑作用。通過(guò)熱軋潤(rùn)滑實(shí)驗(yàn)及對(duì)板帶鋼熱軋軋后表面EDS分析,提出了水基納米軋制液熱軋流/固二相協(xié)同潤(rùn)滑物理模型。納米TiO2不僅能夠提高水基軋制液承載能力,還能夠填充到熱軋板表面裂紋中,修復(fù)表面缺陷,同時(shí)減少氧化鐵皮與軋輥的直接接觸,改善熱軋板帶鋼軋后表面質(zhì)量。 明確了冷軋水基納米軋制液潤(rùn)滑處于混合潤(rùn)滑狀態(tài),考慮固體納米TiO2及軋件表面等效粗糙度夾帶建立了水基納米軋制液入口區(qū)潤(rùn)滑膜厚度模型,計(jì)算分析了納米Ti02濃度、表面粗糙度對(duì)入口潤(rùn)滑膜厚度影響。綜合考慮納米粒子的添加及軋件表面微凸體變形建立了冷軋變形區(qū)混合潤(rùn)滑模型,研究了水基納米軋制液黏度、表面粗糙度特征、壓下率等參數(shù)對(duì)變形區(qū)潤(rùn)滑膜壓力、接觸面積比和膜厚比的影響。
[Abstract]:With the development of continuous, automatic, high efficiency, energy saving and environmental protection in strip rolling production, the lubrication technology of rolling process has been paid more and more attention to and applied. With the global energy crisis and environmental pollution becoming more and more serious, The requirements of energy saving and clean production for iron and steel industry are also put forward. There are many problems in the process of using oil based rolling lubricant, such as poor operating environment, easy corruption and deterioration, difficult to deal with oil sludge, etc. And it is difficult to meet the increasingly harsh production conditions, so more and more attention has been paid to water-based rolling fluid. The rapid development of water-based rolling fluid shows many advantages, such as excellent cooling, cleaning, economy and safety, etc. However, there are some problems such as poor lubricity and poor antirust performance. In order to solve the above problems of oil-base rolling lubricant and water-based rolling fluid, it is necessary to deeply study the new rolling lubricant and rolling lubrication theory. With the development of nano-lubricating technology, a new way of thinking is provided to solve the problems existing in oil-based lubricant and the shortcomings of water-based rolling fluid. In this paper, the method of combining physical dispersion with chemical dispersion is used to realize nanometer TiO2. Stable dispersion in water-based systems, At the same time, other water-soluble functional additives were added to prepare new water-based nano-rolling fluid suitable for hot rolling and cold rolling according to certain technological process. Through tribological properties, wetting properties and viscosity, rolling lubricity, The surface quality after rolling was studied systematically and synthetically, which provided the technical way and condition for solving the problem of oil based lubricant. It is of great significance to promote the development of rolling lubrication technology and nanometer rolling fluid. The tribological properties and friction and wear properties of the new water-based nano-rolling fluids were studied. The results showed that the loading capacity of water-based rolling fluids was obviously improved, and the friction coefficient and wear spot diameter were decreased by adding nanometer TiO2. The results of hot rolling and cold rolling lubrication tests show that the application of water-based nano-rolling fluid can effectively reduce the rolling force and improve the surface quality after rolling, and at the same time, the addition of nanometer TiO2 can improve the corrosion inhibition performance of water-based rolling fluid. The annealing cleanliness of cold rolled strip is superior to that of emulsion. The results of Gleeble thermal compression test show that nano TiO2 has excellent thermal decomposition stability and high temperature lubricity. The theoretical calculation and thermogravimetric analysis further show that nano TiO2 is produced in the state of solid particles during rolling process. Lubricating effect. Through hot rolling lubrication experiment and EDS analysis of the surface of strip after hot rolling, A physical model of hot rolling fluid / solid two-phase synergistic lubrication for water-based nanocrystalline rolling fluid is presented. Nano TiO2 can not only improve the bearing capacity of water-based rolling fluid, but also be filled into the surface crack of hot rolled plate to repair the surface defects. At the same time, the direct contact between the oxide sheet and the roll is reduced, and the surface quality of hot rolled strip is improved. In this paper, the lubrication of cold rolling water based nanometer rolling fluid is in mixed lubrication state. Considering solid nanometer TiO2 and equivalent roughness entrainment of workpiece surface, the thickness model of lubricating film in inlet region of water based nano rolling fluid is established, and the concentration of nano Ti02 is calculated and analyzed. The influence of surface roughness on the thickness of inlet lubricating film was studied. Considering the addition of nano-particles and deformation of micro-protrusions on the surface of workpiece, a mixed lubrication model of cold rolling deformation zone was established, and the viscosity and surface roughness characteristics of water-based nano-rolling fluid were studied. The influence of reduction rate and other parameters on the lubrication film pressure, contact area ratio and film thickness ratio in deformation zone.
【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(lèi)號(hào)】：TG331;TB383.1

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