本文選題：液壓機 + 應(yīng)變片檢測　； 參考：《天津理工大學(xué)》2015年碩士論文

【摘要】：等溫鍛造液壓機是大飛機、航空、軍工制造業(yè)的基礎(chǔ)設(shè)備,隨著我國航空航天領(lǐng)域的快速發(fā)展,如何加工出符合需求的高精度鈦合金鍛件成為了一大難題。等溫鍛造液壓機的制造就是為了完成鈦合金模鍛工藝的重要裝備。而如何制造出高剛度的系列化機架裝備尤為重要。本文以THP11D-20000為試驗對象,對液壓機剛度檢測、有限元模擬、優(yōu)化方案、模態(tài)分析進行了研究。1.對THP11D-20000等溫鍛造液壓機進行檢測,制定機身剛度檢測規(guī)范,采用應(yīng)變片檢測剛度,對200MN重型數(shù)控超塑性等溫鍛造液壓機樣機進行聯(lián)機檢測,完成樣機在不同載荷下的剛度檢測,以驗證重型整體組合框架式機身結(jié)構(gòu)設(shè)計的可靠性。用數(shù)學(xué)方程的形式表達機身關(guān)鍵性部件的變形特征,得出非線性曲線。2.建立液壓機—模具耦合模型,通過有限元分析法得到液壓機在滿載狀況下的剛度、強度;并將有限元分析結(jié)果與試驗結(jié)果相比較,通過對比所得結(jié)果可以驗證出設(shè)計模型及模擬分析結(jié)果的準確性。3.通過對液壓機兩個重要的部件可改善參數(shù)的分析,分別在組合上下橫梁確定下4個影響因素較大的優(yōu)化變量。運用Box-Behnken Design(BBD)設(shè)計方法得出響應(yīng)面模型的擬合方程及方差分析,并分別以撓度和質(zhì)量為優(yōu)化目標。上橫梁撓度降低了0.256mm。下橫梁撓度降低了0.012mm。上橫梁質(zhì)量降低了3.92 t。下橫梁質(zhì)量降低了39.31 t。4.對THP11D-20000等溫鍛造液壓機進行模態(tài)分析。首先,介紹了有限元模態(tài)分析的概念、理論,再利用Workbench分別對液壓機預(yù)緊狀態(tài)和滿載預(yù)緊狀態(tài)下的整體機架進行有限元模態(tài)分析,得到了機架的前六階模態(tài)的固有頻率和相應(yīng)的固有振型,并對各個狀態(tài)下的前六階固有頻率和振型進行了詳盡的分析和評價。機架整體的剛度和質(zhì)量分布較為均衡,無明顯的薄弱部位和過剩部位,只需在維保時注意大小拉桿的預(yù)緊力。地腳螺釘在五階振型中出現(xiàn)應(yīng)力交替變化的現(xiàn)象,材料可能會開裂或疲勞斷裂。各階固有頻率都在5~17Hz,屬于次聲波范圍,會產(chǎn)生一定的噪音,因此,應(yīng)注意防護噪音污染。
[Abstract]:Isothermal forging hydraulic press is the basic equipment of large aircraft, aviation and military manufacturing industry. With the rapid development of aerospace industry in China, how to process high-precision titanium alloy forgings that meet the requirements has become a major problem. The manufacture of isothermal forging hydraulic press is to complete the important equipment of titanium alloy die forging process. And how to produce high rigidity serialized frame equipment is particularly important. In this paper, THP11D-20000 is taken as the experimental object. The stiffness test, finite element simulation, optimization scheme and modal analysis of hydraulic press are studied. The THP11D-20000 isothermal forging hydraulic press was tested, and the stiffness test criterion of fuselage was established. The strain gauge was used to detect the stiffness of the 200MN heavy-duty NC superplastic isothermal forging hydraulic press. The stiffness of the prototype was tested under different loads. In order to verify the reliability of heavy integrated frame structure design. The deformation characteristics of the key parts of the fuselage are expressed in the form of mathematical equation, and the nonlinear curve. 2. 2. The coupling model of hydraulic press and die is established, the stiffness and strength of hydraulic press under full load are obtained by finite element analysis, and the results of finite element analysis are compared with the test results. The accuracy of the design model and the simulation results can be verified by comparing the results. Through the analysis of two important parts of hydraulic press which can improve the parameters, four optimization variables with larger influence factors are determined under the combination of upper and lower cross beams respectively. The fitting equation and variance analysis of the response surface model are obtained by using the Box-Behnken design method, and the deflection and mass are taken as the optimization objectives respectively. The deflection of the upper beam is reduced by 0.256 mm. The deflection of the lower beam is reduced by 0.012 mm. The mass of the upper beam was reduced by 3.92 t. The mass of the lower beam is reduced by 39.31 t.4. Modal analysis of THP11D-20000 isothermal forging hydraulic press is carried out. Firstly, the concept and theory of finite element modal analysis are introduced, and then the finite element modal analysis of the whole frame under the preload state and the full load preloading state is carried out by using Workbench, respectively. The natural frequencies and corresponding natural modes of the first six modes of the frame are obtained, and the first six natural frequencies and modes are analyzed and evaluated in detail. The stiffness and mass distribution of the whole frame is more balanced, and there is no obvious weak part and excess part, only need to pay attention to the pre-tension force of the large and small strut during the maintenance period. The stress changes alternately in the fifth-order mode, and the material may crack or fatigue fracture. The natural frequencies of each order are at 5 ~ 17 Hz, which belong to infrasonic wave range and produce certain noise. Therefore, attention should be paid to the prevention of noise pollution.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG315

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