本文選題：冷擺輾成形 + 擺頭運(yùn)動(dòng)軌跡　； 參考：《機(jī)械科學(xué)研究總院》2015年博士論文

【摘要】：本文以具有圓、直線、螺旋線和多葉玫瑰線四種擺頭運(yùn)動(dòng)軌跡的立式冷擺輾機(jī)為研究對(duì)象,針對(duì)直線、螺旋線和多葉玫瑰線運(yùn)動(dòng)軌跡無(wú)法實(shí)現(xiàn)連續(xù)局部成形問(wèn)題,提出橢圓、不過(guò)中心的螺旋線和多葉玫瑰線的擺頭新型運(yùn)動(dòng)軌跡。在冷擺輾成形力的理論研究及試驗(yàn)的基礎(chǔ)上,對(duì)擺頭擺角對(duì)擺輾成形力影響、擺頭不同運(yùn)動(dòng)軌跡成形過(guò)程進(jìn)行深入研究。這一課題的研究將解決目前冷擺輾機(jī)直線軌跡應(yīng)用少、螺旋線和多葉玫瑰線軌跡沒(méi)有實(shí)際應(yīng)用的狀況,為改進(jìn)擺頭結(jié)構(gòu)、設(shè)計(jì)新型擺輾機(jī)和拓展冷擺輾成形工藝提供理論依據(jù)。在分析立式冷擺輾機(jī)擺頭結(jié)構(gòu)及運(yùn)動(dòng)原理基礎(chǔ)上,建立擺頭運(yùn)動(dòng)方程,推導(dǎo)出圓、直線、螺旋線和多葉玫瑰線四種運(yùn)動(dòng)軌跡的形成機(jī)理及規(guī)律,通過(guò)對(duì)擺頭四種運(yùn)動(dòng)軌跡特點(diǎn)分析,建立擺頭擺角與內(nèi)、外偏心套夾角函數(shù)關(guān)系,提出擺頭新型運(yùn)動(dòng)軌跡,并對(duì)其運(yùn)動(dòng)方程及規(guī)律進(jìn)行理論分析,對(duì)擺頭運(yùn)動(dòng)機(jī)構(gòu)的改進(jìn)可行性進(jìn)行了論證。擺頭新型運(yùn)動(dòng)軌跡避開了軌跡中心點(diǎn),可實(shí)現(xiàn)成形過(guò)程中的連續(xù)局部成形,降低擺輾成形力,改善擺頭受力狀況。通過(guò)冷擺輾成形影響因素及受力分析,針對(duì)目前擺輾接觸面積在擺角較小時(shí)計(jì)算誤差大造成擺輾成形力計(jì)算不準(zhǔn)確的問(wèn)題,重新推導(dǎo)擺輾成形接觸面積的計(jì)算公式并進(jìn)行校驗(yàn),建構(gòu)擺輾成形力與工藝參數(shù)關(guān)系,完善擺輾成形力理論計(jì)算公式,為不同運(yùn)動(dòng)軌跡擺輾成形力分析提供了理論基礎(chǔ)。在研制的2000kN立式冷擺輾機(jī)上,以法蘭件為試驗(yàn)對(duì)象,擺頭采用圓運(yùn)動(dòng)軌跡在不同擺角下進(jìn)行擺輾成形試驗(yàn),采集擺輾成形力變化數(shù)據(jù),結(jié)合Deform-3D有限元模擬擺輾成形過(guò)程,分析、校驗(yàn)數(shù)值模擬結(jié)果以及擺輾成形力計(jì)算公式,得出擺頭擺角與擺輾成形力關(guān)系圖,為運(yùn)動(dòng)軌跡改進(jìn)的參數(shù)選擇提供理論依據(jù)。建立擺頭三維運(yùn)動(dòng)軌跡方程,應(yīng)用MATLAB軟件對(duì)擺輾成形過(guò)程三維曲線進(jìn)行仿真,對(duì)不同運(yùn)動(dòng)軌跡擺輾成形過(guò)程曲線理論分析,結(jié)合圓、螺旋線和多葉玫瑰線運(yùn)動(dòng)軌跡擺輾成形試驗(yàn),對(duì)運(yùn)動(dòng)軌跡改進(jìn)前、后成形過(guò)程規(guī)律及特點(diǎn)進(jìn)行分析。本文建立了擺頭運(yùn)動(dòng)方程、擺頭擺角與偏心套夾角函數(shù)關(guān)系、擺輾成形力理論計(jì)算公式,分析了擺頭改進(jìn)前、后運(yùn)動(dòng)軌跡的形成機(jī)理及規(guī)律,通過(guò)理論分析、模擬研究與成形試驗(yàn)比較、驗(yàn)證,得出擺角與擺輾成形力關(guān)系以及不同運(yùn)動(dòng)軌跡擺輾成形過(guò)程曲線及特點(diǎn),論證了改進(jìn)運(yùn)動(dòng)軌跡的優(yōu)勢(shì)。
[Abstract]:In this paper, the vertical cold rolling machine with circular, straight, helical and multi-leaf rose lines is taken as the research object. Aiming at the problem that the motion trajectory of straight line, spiral line and multi-leaf rose line can not realize continuous local forming, an ellipse is proposed.But the spiral of the center and the new trajectory of the pendulum of the leafy rose line.On the basis of the theoretical study and experiment of the forming force of cold rotary rolling, the effect of pendulum angle on the forming force and the forming process of different moving trajectories of the pendulum head are studied in depth.The research of this subject will solve the problem that the linear track of cold rotary rolling machine is few and the track of spiral line and multi-leaf rose line has no practical application at present. It provides a theoretical basis for improving the structure of the pendulum head, designing a new type of rotary rolling machine and expanding the forming technology of cold rotary rolling.Based on the analysis of the structure and motion principle of the pendulum head of the vertical cold rotary rolling machine, the motion equation of the pendulum head is established, and the forming mechanism and law of four motion trajectories of circle, straight line, spiral line and multi-leaf rose line are deduced.Based on the analysis of the characteristics of the four kinds of motion trajectories of the pendulum head, the relationship between the swing angle of the pendulum head and the angle function of the inner and outer eccentric sleeve is established, and the new motion trajectory of the pendulum head is put forward, and its motion equation and law are analyzed theoretically.The feasibility of improving the movement mechanism of swinging head is demonstrated.The new trajectory of swinging head can avoid the center point of the trajectory and can realize continuous local forming in the forming process, reduce the forming force and improve the force condition of the swinging head.Based on the analysis of the influence factors and forces on the cold rotary rolling forming, aiming at the problem of inaccurate calculation of the forming force caused by the large error in the calculation of the contact area in the rotary rolling at present, the formula for calculating the contact area of the rotary rolling forming is rededuced and verified.The relationship between forming force and technological parameters is constructed, and the theoretical formula of forming force is perfected, which provides a theoretical basis for the analysis of forming force of rotary forging with different motion trajectories.In the 2000kN vertical cold rotary rolling machine, taking flange parts as the test object, the swinging head adopts circular motion track to carry out the forming test under different swing angles, collects the data of the changing force of the rotary rolling, simulates the forming process of the rotary rolling with Deform-3D finite element method, and analyzes the forming process of the pendulum rolling.By checking the numerical simulation results and calculating formula of the forming force of rotary rolling, the diagram of the relationship between the swing angle of the pendulum head and the forming force of the rotary rolling is obtained, which provides a theoretical basis for the parameter selection of the motion trajectory improvement.The three-dimensional motion trajectory equation of the pendulum head is established, and the three-dimensional curve of the forming process is simulated by using MATLAB software. The theoretical analysis of the curve of different motion trajectory is carried out, and the circle is combined with the curve theory.The forming process and characteristics of spiral and multi-leaf rose lines were analyzed before and after the motion trajectory was improved.In this paper, the equation of swinging head motion, the relation between the swing angle and the angle function of eccentric sleeve, the theoretical calculation formula of forming force in rotary rolling are established, and the formation mechanism and law of the trajectory before and after the improvement of the pendulum head are analyzed.By comparing the simulation research with the forming test, the relationship between the swing angle and the forming force, the curves and characteristics of the forming process of different motion tracks are obtained, and the advantages of improving the motion trajectory are demonstrated.
【學(xué)位授予單位】：機(jī)械科學(xué)研究總院
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG306

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本文編號(hào)：1766756