球軸承滾動體螺旋孔型斜軋宏微觀變形與損傷行為研究
發(fā)布時間：2018-09-02 08:32
【摘要】：滾動軸承是高速鐵路、高速精密機床和冶金軋機等重大裝備技術領域的核心配套部件之一。但目前國內(nèi)生產(chǎn)的滾動軸承還無法較好的滿足上述重大裝備領域高速、重載等惡劣服役工況。滾動體作為滾動軸承關鍵組件,其成形制造技術水平直接影響著滾動軸承的動態(tài)性能、可靠性和服役壽命。螺旋孔型斜軋(斜軋)是目前生產(chǎn)軸承滾動體零件的一種優(yōu)質(zhì)、高效塑性加工技術。但斜軋工藝設計和變形機理復雜,成形精度和組織性能也還缺乏科學、有效的調(diào)控方法,都致使其無法較好的服務于高性能滾動體的成形制造。本文以鋼球滾動體的熱斜軋成形為研究對象,通過解決建模仿真中軋輥精確建模方法、仿真平臺選擇、軋件畸變、網(wǎng)格劃分、求解參數(shù)設置等關鍵技術問題,基于SIMUFACT建立了軸承鋼球熱斜軋三維宏微觀有限元仿真模型�；谀M結果,揭示了鋼球熱斜軋成形過程塑性應變、溫度、軋制力能參數(shù)、相對滑動與磨損、動態(tài)再結晶、靜態(tài)再結晶和晶粒尺寸等宏微觀變形規(guī)律。針對鋼球熱斜軋心部損傷,通過研究應力場的分布和演變特征闡明心部損傷是心部區(qū)域較高水平的橫向拉應力、循環(huán)交變的剪切應力和多向拉應力為主的負靜水壓應力狀態(tài)共同作用的結果。在此基礎上,從不考慮靜水壓應力下?lián)p傷增長和基于Zener-Hollomon系數(shù)耦合變形溫度與應變速率影響兩個方面,改進了Lemaitre損傷模型。同時進一步借助SIMUFACT二次開發(fā)技術,將改進損傷模型嵌入到有限元模型中,建立了鋼球熱斜軋損傷預測模型。軋輥軋制孔型和軋制工藝參數(shù)對鋼球熱斜軋作用機制的研究結果表明:本文提出的冪指函數(shù)凸棱高度變化特征孔型方案能軋制出成形精度更高、晶粒尺寸更細的球坯;過高或過低的軋制溫度和過大或者過小的軋輥傾角均會降低軋制成形精度;球坯晶粒尺寸和軸心區(qū)域損傷均對軋制溫度較為敏感,隨軋制溫度的升高,晶粒尺寸呈現(xiàn)顯著的粗化,心部損傷程度大幅增加。研究結果能為鋼球滾動體熱斜軋的控形與控性成形提供有效指導。
[Abstract]:Rolling bearing is one of the core parts of high-speed railway, high-speed precision machine tool and metallurgical mill. But at present, the rolling bearings produced in our country can not meet the high speed, heavy load and other bad service conditions. As the key component of rolling bearing, the level of forming and manufacturing technology directly affects the dynamic performance, reliability and service life of rolling bearing. Spiral pass cross rolling (cross rolling) is a kind of high quality and high efficiency plastic machining technology for producing bearing rolling parts. However, the cross rolling process design and deformation mechanism are complex, the forming accuracy and microstructure and properties are also lack of scientific, effective control methods, so that it can not be a better service for the forming and manufacturing of high performance rolling body. In this paper, the hot cross rolling forming of steel ball rolling body is taken as the research object. By solving the key technical problems in modeling and simulation, such as the precise modeling method of roll, the selection of simulation platform, the distortion of rolling piece, the mesh division, the solution of parameter setting, etc. Based on SIMUFACT, a three-dimensional macro-micro finite element simulation model for hot cross rolling of bearing steel balls is established. Based on the simulation results, the macro and micro deformation rules such as plastic strain, temperature, rolling force and energy parameters, relative sliding and wear, dynamic recrystallization, static recrystallization and grain size were revealed. In view of the damage to the center of hot cross rolling steel ball, the distribution and evolution characteristics of stress field are studied. It is shown that the damage of the center is a high level of transverse tensile stress in the center region. The result of the interaction between cyclic shear stress and multi-direction tensile stress in the negative hydrostatic stress state. On this basis, the damage growth under hydrostatic stress and the influence of deformation temperature and strain rate based on Zener-Hollomon coefficient are taken into account to improve the damage model of Lemaitre. At the same time, the improved damage model is embedded into the finite element model with the help of SIMUFACT secondary development technology, and the damage prediction model for hot cross rolling of steel balls is established. The effect of rolling pass and rolling process parameters on hot cross rolling of steel ball is studied. The results show that the feature pass scheme proposed in this paper can roll the billet with higher forming precision and finer grain size. Too high or too low rolling temperature and too large or too small roll inclination angle will reduce the rolling forming precision, the grain size and the damage in the axial zone of the ball blank are sensitive to the rolling temperature, and the rolling temperature increases with the increase of rolling temperature. The grain size showed obvious coarsening and the degree of heart damage increased significantly. The results can provide effective guidance for shape control and controlled forming of rolling body.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG335.17;TH133.3
本文編號：2218819
[Abstract]:Rolling bearing is one of the core parts of high-speed railway, high-speed precision machine tool and metallurgical mill. But at present, the rolling bearings produced in our country can not meet the high speed, heavy load and other bad service conditions. As the key component of rolling bearing, the level of forming and manufacturing technology directly affects the dynamic performance, reliability and service life of rolling bearing. Spiral pass cross rolling (cross rolling) is a kind of high quality and high efficiency plastic machining technology for producing bearing rolling parts. However, the cross rolling process design and deformation mechanism are complex, the forming accuracy and microstructure and properties are also lack of scientific, effective control methods, so that it can not be a better service for the forming and manufacturing of high performance rolling body. In this paper, the hot cross rolling forming of steel ball rolling body is taken as the research object. By solving the key technical problems in modeling and simulation, such as the precise modeling method of roll, the selection of simulation platform, the distortion of rolling piece, the mesh division, the solution of parameter setting, etc. Based on SIMUFACT, a three-dimensional macro-micro finite element simulation model for hot cross rolling of bearing steel balls is established. Based on the simulation results, the macro and micro deformation rules such as plastic strain, temperature, rolling force and energy parameters, relative sliding and wear, dynamic recrystallization, static recrystallization and grain size were revealed. In view of the damage to the center of hot cross rolling steel ball, the distribution and evolution characteristics of stress field are studied. It is shown that the damage of the center is a high level of transverse tensile stress in the center region. The result of the interaction between cyclic shear stress and multi-direction tensile stress in the negative hydrostatic stress state. On this basis, the damage growth under hydrostatic stress and the influence of deformation temperature and strain rate based on Zener-Hollomon coefficient are taken into account to improve the damage model of Lemaitre. At the same time, the improved damage model is embedded into the finite element model with the help of SIMUFACT secondary development technology, and the damage prediction model for hot cross rolling of steel balls is established. The effect of rolling pass and rolling process parameters on hot cross rolling of steel ball is studied. The results show that the feature pass scheme proposed in this paper can roll the billet with higher forming precision and finer grain size. Too high or too low rolling temperature and too large or too small roll inclination angle will reduce the rolling forming precision, the grain size and the damage in the axial zone of the ball blank are sensitive to the rolling temperature, and the rolling temperature increases with the increase of rolling temperature. The grain size showed obvious coarsening and the degree of heart damage increased significantly. The results can provide effective guidance for shape control and controlled forming of rolling body.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG335.17;TH133.3
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