本文關(guān)鍵詞： 無縫鋼管 小直徑 三輥連軋 芯棒 無網(wǎng)格法 數(shù)值仿真　出處：《太原科技大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：無縫鋼管在國(guó)民經(jīng)濟(jì)建設(shè)中應(yīng)用廣泛,是一種不可缺少的經(jīng)濟(jì)斷面鋼材。小直徑鋼管國(guó)內(nèi)外需求逐年增大,該類產(chǎn)品的生產(chǎn)設(shè)備數(shù)量巨大。而我國(guó)國(guó)內(nèi)生產(chǎn)工藝以冷拔、冷拉、擠壓為主,這些生產(chǎn)工藝落后,環(huán)境污染嚴(yán)重,能耗驚人。隨著人們對(duì)環(huán)境保護(hù),節(jié)能降耗等方面越來越高的要求,這些設(shè)備及工藝已被列為淘汰之列。三輥連軋機(jī)組具有生產(chǎn)工藝先進(jìn)、生產(chǎn)節(jié)奏快、污染排放低等優(yōu)點(diǎn),使其成為小直徑鋼管生產(chǎn)的推薦機(jī)型。然而,現(xiàn)存的三輥連軋機(jī)組均針對(duì)大直徑荒管生產(chǎn)設(shè)計(jì),小直徑鋼管連軋工藝及設(shè)備還處于探索研究階段,小直徑鋼管連軋工藝研究勢(shì)在必行。因此,開展小直徑無縫鋼管短流程連軋工藝過程的基本理論及仿真技術(shù)研究,掌握小直徑鋼管連軋變形機(jī)理、成形規(guī)律,對(duì)進(jìn)一步簡(jiǎn)化設(shè)備、工藝設(shè)計(jì)過程,節(jié)能減排,縮短產(chǎn)品生產(chǎn)工序,降低企業(yè)設(shè)備、人力投入,提升企業(yè)競(jìng)爭(zhēng)力具有重要的意義和是實(shí)用價(jià)值。已有的三輥連軋孔型設(shè)計(jì)理論難以解決鋼管小直徑條件下的連軋工藝設(shè)計(jì)問題,加之短流程工藝,機(jī)架數(shù)目減少,更增大了孔型設(shè)計(jì)的難度。為了解決以上問題,本文首先結(jié)合理論、實(shí)際生產(chǎn)經(jīng)驗(yàn),對(duì)小直徑鋼管連軋變形過程進(jìn)行理論分析,揭示小直徑鋼管連軋變形特征,推導(dǎo)了小直徑鋼管連軋工藝孔型設(shè)計(jì)方法。為了深入研究小直徑鋼管連軋變形特征,建立了鋼管連軋變形過程三維無網(wǎng)格法數(shù)值仿真模型。該模型使用移動(dòng)最小二乘法構(gòu)建未知場(chǎng)近似函數(shù),結(jié)合雙重點(diǎn)法簡(jiǎn)化近似函數(shù)的構(gòu)建及求導(dǎo)過程;使用局部修正法對(duì)近似函數(shù)進(jìn)行修正,以便精確、快速施加邊界條件;使用加權(quán)最小二乘法構(gòu)建速度場(chǎng)剛度矩陣,使用配點(diǎn)法直接構(gòu)建溫度場(chǎng)剛度矩陣;采用間接耦合法將速度場(chǎng)與溫度場(chǎng)耦合求解。通過仿真研究了連軋過程幾何形狀變化、溫度場(chǎng)分布、應(yīng)力應(yīng)變場(chǎng)分布,且該模型通過了實(shí)驗(yàn)驗(yàn)證,驗(yàn)證了其有效性。通過對(duì)不同孔型、不同規(guī)格產(chǎn)品的系列仿真與實(shí)驗(yàn),研究了小直徑鋼管金屬變形特征、孔型與軋輥轉(zhuǎn)速對(duì)軋制力能參數(shù)的影響、寬展變形規(guī)律、金屬流動(dòng)規(guī)律;開發(fā)了小直徑鋼管連軋工藝技術(shù),經(jīng)實(shí)驗(yàn)證明其理論是可靠的,工藝技術(shù)是可行的。
[Abstract]:Seamless steel pipe is widely used in national economic construction and is an indispensable economic section steel. The domestic and foreign demand for small diameter steel pipe is increasing year by year, and the production equipment of this kind of products is huge. Extrusion is the main factor. These production processes are backward, environmental pollution is serious, and energy consumption is staggering. With the increasing demand for environmental protection, energy saving and consumption reduction, These equipments and processes have been listed in the list of elimination. The three-high continuous rolling mill has the advantages of advanced production technology, fast production rhythm and low pollution emission, which makes it a recommended model for the production of small diameter steel tubes. The existing three-high continuous rolling mill is designed for the production of large diameter steel tube, and the continuous rolling process and equipment of small diameter steel pipe are still in the stage of exploration and research, so it is imperative to study the continuous rolling process of small diameter steel pipe. The basic theory and simulation technology of short process continuous rolling process of small diameter seamless steel tube are studied, and the deformation mechanism and forming law of small diameter seamless steel pipe are grasped, which can further simplify the equipment, process design process, save energy and reduce emissions. It is of great significance and practical value to shorten the production process of products, reduce the input of equipment and manpower, and promote the competitiveness of enterprises. The existing theory of pass design for three-roll continuous rolling is difficult to solve the problem of continuous rolling process design under the condition of small diameter of steel pipe. In addition, because of the short process process, the number of stand is reduced, and the difficulty of pass design is increased. In order to solve the above problems, this paper firstly analyzes the deformation process of small diameter steel tube by combining the theory and practical production experience. The characteristics of continuous rolling deformation of small diameter steel tube are revealed, and the pass design method of continuous rolling process of small diameter steel pipe is deduced, in order to study the deformation characteristics of continuous rolling of small diameter steel tube in depth, A three-dimensional meshless numerical simulation model for continuous steel tube rolling process is established, in which the unknown field approximation function is constructed by moving least square method, and the construction and derivation process of the approximate function is simplified with the dual point method. The local correction method is used to modify the approximate function so that the boundary conditions can be applied accurately and quickly, the velocity field stiffness matrix is constructed by weighted least square method, and the temperature field stiffness matrix is constructed directly by collocation method. The coupling of velocity field and temperature field is solved by indirect coupling method. The geometric shape change, temperature field distribution, stress and strain field distribution in continuous rolling process are studied by simulation, and the model is verified by experiments. Through the series simulation and experiment of different pass and different specification products, the metal deformation characteristics of small diameter steel tube, the influence of pass and roll speed on rolling force and energy parameters, and the law of wide deformation are studied. The technology of continuous rolling of small diameter steel pipe has been developed. The theory is proved to be reliable and the technology is feasible.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG335.71

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