發(fā)布時(shí)間：2018-12-14 22:17

【摘要】：高品質(zhì)、優(yōu)性能的沖壓液壓機(jī)成為當(dāng)下的發(fā)展趨勢(shì),本文針對(duì)沖壓液壓機(jī)板料沖裁瞬態(tài)失載引起強(qiáng)烈振動(dòng)、結(jié)構(gòu)優(yōu)化未考慮彎曲性開(kāi)縫、沖壓過(guò)程性能缺乏綜合仿真驗(yàn)證等問(wèn)題,提出了沖壓液壓機(jī)沖裁緩沖設(shè)計(jì)與性能優(yōu)化仿真技術(shù),并結(jié)合實(shí)際項(xiàng)目將其運(yùn)用到?jīng)_壓液壓機(jī)的研發(fā)當(dāng)中。本文的主要研究?jī)?nèi)容如下：第一章概述了沖壓液壓機(jī)的發(fā)展趨勢(shì)和技術(shù)需求,綜述了液壓機(jī)沖裁減振、產(chǎn)品結(jié)構(gòu)優(yōu)化和性能仿真技術(shù)的研究現(xiàn)狀,分析了現(xiàn)有研究存在的問(wèn)題和不足,提出了沖壓液壓機(jī)沖裁緩沖設(shè)計(jì)與性能優(yōu)化仿真技術(shù),給出了論文的組織結(jié)構(gòu)和總體框架。第二章提出了面向瞬態(tài)失載的沖壓液壓機(jī)主機(jī)自適應(yīng)沖裁緩沖設(shè)計(jì)方法。在板料沖裁最大沖裁力之前對(duì)緩沖缸進(jìn)行預(yù)壓縮,當(dāng)緩沖缸作用力上升到與沖裁力之和達(dá)到設(shè)定值后,保持工作缸作用力在設(shè)定值不變進(jìn)行沖裁,實(shí)現(xiàn)了緩沖力自動(dòng)適應(yīng)板料沖裁力的變化。為了指導(dǎo)緩沖點(diǎn)位置等參數(shù)的設(shè)置,研究了板厚、間隙等參數(shù)對(duì)最大沖裁力及其位置的影響,通過(guò)拉丁超立方試驗(yàn)設(shè)計(jì),得到了基于響應(yīng)面模型的最大沖裁力及其位置的近似函數(shù),最后簡(jiǎn)單討論了該緩沖方法的實(shí)現(xiàn)途徑。第三章提出了面向彎曲開(kāi)縫的沖壓液壓機(jī)全預(yù)緊機(jī)架結(jié)構(gòu)參數(shù)優(yōu)化方法。通過(guò)對(duì)機(jī)架的受載變形分析及結(jié)構(gòu)幾何特性計(jì)算,得到了臨界載荷、質(zhì)量與關(guān)鍵設(shè)計(jì)尺寸之間的參數(shù)化模型,并構(gòu)建了機(jī)架一階固有頻率的Kriging近似模型。在尺寸設(shè)計(jì)空間內(nèi),運(yùn)用改進(jìn)的細(xì)菌覓食算法對(duì)以臨界載荷最大、質(zhì)量最小為目標(biāo),一階固有頻率為約束的優(yōu)化模型進(jìn)行求解。以20MN薄板沖壓液壓機(jī)機(jī)架結(jié)構(gòu)參數(shù)優(yōu)化為例,驗(yàn)證了方法的可行性。第四章提出了面向沖壓過(guò)程的沖壓液壓機(jī)本體動(dòng)靜態(tài)特性仿真分析方法。在對(duì)沖壓過(guò)程分析的基礎(chǔ)上,構(gòu)建了關(guān)鍵部件受載變形、上梁立柱接觸狀態(tài)、油缸疲勞破壞和機(jī)架振動(dòng)的相關(guān)數(shù)學(xué)模型,從運(yùn)動(dòng)學(xué)、靜力學(xué)、動(dòng)力學(xué)的角度進(jìn)行了壓機(jī)本體動(dòng)靜態(tài)特性綜合仿真分析。以20MN薄板沖壓液壓機(jī)為例,給出了機(jī)架剛度強(qiáng)度、上梁立柱接觸應(yīng)力、工作主缸疲勞壽命、機(jī)架6階模態(tài)的仿真分析結(jié)果。第五章結(jié)合企業(yè)項(xiàng)目,開(kāi)發(fā)了合肥合鍛沖壓液壓機(jī)產(chǎn)品信息管理與優(yōu)化仿真系統(tǒng),并在企業(yè)中得到實(shí)際應(yīng)用,驗(yàn)證了本文所述方法的有效性和實(shí)用性。第六章總結(jié)了論文的研究成果和工作,并對(duì)今后的研究方向進(jìn)行了展望。
[Abstract]:High quality and excellent performance stamping hydraulic press has become the current trend of development. In this paper, the dynamic vibration of sheet metal blanking caused by transient loss of load, structure optimization does not take into account the bending slit. The stamping process performance is short of comprehensive simulation verification and so on. This paper puts forward the stamping buffer design and performance optimization simulation technology of stamping hydraulic press, and applies it to the research and development of stamping hydraulic press combined with the actual project. The main contents of this paper are as follows: in the first chapter, the development trend and technical requirements of stamping hydraulic press are summarized, and the research status of press blanking vibration reduction, product structure optimization and performance simulation technology is summarized. The problems and shortcomings of the existing research are analyzed, and the technology of stamping buffer design and performance optimization simulation is put forward, and the organization structure and overall framework of the paper are given. In the second chapter, an adaptive blanking buffer design method for the hydraulic press is proposed. The buffer cylinder is precompressed before the maximum blanking force of sheet metal is blanked. When the action force of the buffer cylinder rises to the set value of the sum of the force and the blanking force, the working cylinder force is kept unchanged in the set value for punching. The buffering force can automatically adapt to the change of blanking force. In order to guide the setting of buffer position and other parameters, the effects of plate thickness and clearance on the maximum blanking force and its position are studied. The Latin hypercube experimental design is used to study the influence of plate thickness and clearance on the maximum blanking force and its position. The approximate function of the maximum blanking force and its position based on the response surface model is obtained. Finally, the implementation of the buffer method is briefly discussed. In chapter 3, the optimization method of the structural parameters of the full preload frame of hydraulic press for bending slit is proposed. The parameterized model between critical load, mass and key design size is obtained by analyzing the deformation of the frame under load and calculating the geometric characteristics of the structure, and the Kriging approximation model of the first order natural frequency of the frame is constructed. The improved bacterial foraging algorithm is used to solve the optimization model with maximum critical load, minimum mass and first order natural frequency constraint in the dimension design space. The feasibility of the method is verified by the optimization of the structural parameters of the 20MN sheet stamping hydraulic press frame. In chapter 4, the dynamic and static characteristics simulation method for stamping hydraulic press is presented. Based on the analysis of the stamping process, the mathematical models of the deformation of the key components under load, the contact state of the upper beam column, the fatigue failure of the cylinder and the vibration of the frame are constructed, including kinematics, statics, etc. The dynamic and static characteristics of the press body are simulated and analyzed from the point of view of dynamics. Taking 20MN sheet stamping hydraulic press as an example, the results of simulation analysis of frame stiffness strength, contact stress of upper beam column, fatigue life of main cylinder and sixth order mode of frame are given. In the fifth chapter, the information management and optimization simulation system of Hefei hydraulic press is developed, which is applied in the enterprise, and the validity and practicability of the method are verified. The sixth chapter summarizes the research results and work, and prospects for future research.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG385.1

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 龐逢祥;22MN快鍛液壓機(jī)機(jī)液系統(tǒng)聯(lián)合仿真及試驗(yàn)研究[D];燕山大學(xué);2011年

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本文編號(hào)：2379413