【摘要】：高品質(zhì)、優(yōu)性能的沖壓液壓機成為當(dāng)下的發(fā)展趨勢,本文針對沖壓液壓機板料沖裁瞬態(tài)失載引起強烈振動、結(jié)構(gòu)優(yōu)化未考慮彎曲性開縫、沖壓過程性能缺乏綜合仿真驗證等問題,提出了沖壓液壓機沖裁緩沖設(shè)計與性能優(yōu)化仿真技術(shù),并結(jié)合實際項目將其運用到?jīng)_壓液壓機的研發(fā)當(dāng)中。本文的主要研究內(nèi)容如下：第一章概述了沖壓液壓機的發(fā)展趨勢和技術(shù)需求,綜述了液壓機沖裁減振、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)有研究存在的問題和不足,提出了沖壓液壓機沖裁緩沖設(shè)計與性能優(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)失載的沖壓液壓機主機自適應(yīng)沖裁緩沖設(shè)計方法。在板料沖裁最大沖裁力之前對緩沖缸進行預(yù)壓縮,當(dāng)緩沖缸作用力上升到與沖裁力之和達到設(shè)定值后,保持工作缸作用力在設(shè)定值不變進行沖裁,實現(xiàn)了緩沖力自動適應(yīng)板料沖裁力的變化。為了指導(dǎo)緩沖點位置等參數(shù)的設(shè)置,研究了板厚、間隙等參數(shù)對最大沖裁力及其位置的影響,通過拉丁超立方試驗設(shè)計,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),最后簡單討論了該緩沖方法的實現(xiàn)途徑。第三章提出了面向彎曲開縫的沖壓液壓機全預(yù)緊機架結(jié)構(gòu)參數(shù)優(yōu)化方法。通過對機架的受載變形分析及結(jié)構(gòu)幾何特性計算,得到了臨界載荷、質(zhì)量與關(guān)鍵設(shè)計尺寸之間的參數(shù)化模型,并構(gòu)建了機架一階固有頻率的Kriging近似模型。在尺寸設(shè)計空間內(nèi),運用改進的細(xì)菌覓食算法對以臨界載荷最大、質(zhì)量最小為目標(biāo),一階固有頻率為約束的優(yōu)化模型進行求解。以20MN薄板沖壓液壓機機架結(jié)構(gòu)參數(shù)優(yōu)化為例,驗證了方法的可行性。第四章提出了面向沖壓過程的沖壓液壓機本體動靜態(tài)特性仿真分析方法。在對沖壓過程分析的基礎(chǔ)上,構(gòu)建了關(guān)鍵部件受載變形、上梁立柱接觸狀態(tài)、油缸疲勞破壞和機架振動的相關(guān)數(shù)學(xué)模型,從運動學(xué)、靜力學(xué)、動力學(xué)的角度進行了壓機本體動靜態(tài)特性綜合仿真分析。以20MN薄板沖壓液壓機為例,給出了機架剛度強度、上梁立柱接觸應(yīng)力、工作主缸疲勞壽命、機架6階模態(tài)的仿真分析結(jié)果。第五章結(jié)合企業(yè)項目,開發(fā)了合肥合鍛沖壓液壓機產(chǎn)品信息管理與優(yōu)化仿真系統(tǒng),并在企業(yè)中得到實際應(yīng)用,驗證了本文所述方法的有效性和實用性。第六章總結(jié)了論文的研究成果和工作,并對今后的研究方向進行了展望。
[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)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG385.1

【參考文獻】

相關(guān)碩士學(xué)位論文 前1條

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

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本文編號：2379413