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  本文選題：鐓鍛機(jī)　切入點(diǎn)：肘桿軸承　出處：《燕山大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：鐓鍛機(jī)是臥式曲柄壓力機(jī)的一類，其低速重載的工況條件對肘桿軸承的工作性能提出很高的要求。肘桿軸承在工作過程中，載荷變化幅度大，軸頸耦合變形大，且工作空間受限，因此，現(xiàn)有的采用恒流量供油的低速重載液體靜壓軸承無法滿足鐓鍛機(jī)的安全運(yùn)行要求。 本文根據(jù)肘桿軸承的低速重載和載荷變化幅度大的工況特點(diǎn)，開展軸承性能分析和結(jié)構(gòu)優(yōu)化設(shè)計研究，提出能適應(yīng)載荷變化并自適應(yīng)調(diào)整油膜厚度的變流量供油方案。論文主要內(nèi)容如下： (1)根據(jù)液體靜壓肘桿軸承的功能及性能參數(shù)要求，制定了軸承結(jié)構(gòu)優(yōu)化設(shè)計方案，建立了油膜方程及邊界條件，計算了軸承的靜特性，為后續(xù)的分析與優(yōu)化奠定基礎(chǔ)。 (2)采取理論分析方法，分析了油腔結(jié)構(gòu)參數(shù)、包角及徑向間隙等參數(shù)對軸承性能的影響規(guī)律，通過軸承油膜的流體仿真和軸頸彈流耦合分析，得到了油膜壓力場和軸頸的彈流耦合變形，根據(jù)理論分析結(jié)果確定了軸承最優(yōu)結(jié)構(gòu)參數(shù)，完成了軸承結(jié)構(gòu)參數(shù)的優(yōu)化設(shè)計。 (3)以軸承許用油膜厚度和最大許用油膜壓力為軸承供油流量設(shè)計的約束條件，，適應(yīng)載荷變化并自適應(yīng)調(diào)整油膜厚度為優(yōu)化目標(biāo)，運(yùn)用油膜厚度等效替代的方法，開展變流量供油方案優(yōu)化研究。通過計算滿載工況下各個油腔的供油流量及驗算軸承卸載后油膜厚度，證明恒流量供油無法滿足軸承在整個工作過程的承載要求；運(yùn)用理論計算和有限元的方法，完成了軸承變流量供油方案的設(shè)計，通過變流量供油方案的可行性分析證明了此變流量供油方案能夠?qū)崿F(xiàn)肘桿軸承滿足適應(yīng)載荷變化并自適應(yīng)調(diào)整油膜厚度的目的；最后，給出了一個鐓鍛周期內(nèi)的變流量供油曲線。
[Abstract]:Upsetting machine is a kind of horizontal crank press. The working condition of low speed and heavy load puts forward very high requirements for the working performance of elbow rod bearing. In the working process of elbow rod bearing, the load varies greatly and the coupling deformation of shaft neck is large. And the workspace is limited. Therefore, the existing low-speed and heavy-duty hydrostatic bearings with constant flow rate of oil supply can not meet the requirements of the upsetting machine's safe operation. According to the characteristics of low speed heavy load and large load variation of elbow rod bearing, the performance analysis and structural optimization design of the bearing are carried out in this paper. A variable flow rate oil supply scheme which can adapt to load change and adjust oil film thickness is proposed. The main contents of this paper are as follows:. 1) according to the requirements of the function and performance parameters of the hydrostatic elbow rod bearing, the optimum design scheme of the bearing structure is formulated, the oil film equation and boundary conditions are established, the static characteristics of the bearing are calculated, which lays a foundation for the subsequent analysis and optimization. 2) the influence of the parameters of oil cavity structure, envelope angle and radial clearance on bearing performance is analyzed by theoretical analysis method. The fluid simulation of the oil film of the bearing and the elastohydrodynamic coupling analysis of the journal are carried out through the fluid simulation of the oil film of the bearing and the elastohydrodynamic coupling analysis of the journal. The oil film pressure field and the elastohydrodynamic coupling deformation of the journal are obtained. The optimum structural parameters of the bearing are determined according to the theoretical analysis results and the optimum design of the structural parameters of the bearing is completed. (3) taking the allowable oil film thickness and the maximum allowable oil film pressure of the bearing as the limiting conditions for the design of the oil supply flow, adapting to the change of the load and adjusting the oil film thickness as the optimization objectives, the equivalent substitution method of the oil film thickness is used. Through calculating the oil supply flow rate of each oil chamber and checking the oil film thickness after the bearing unloading, it is proved that the constant flow oil supply can not meet the bearing load requirement in the whole working process. Using theoretical calculation and finite element method, the design of bearing variable flow oil supply scheme is completed. Through the feasibility analysis of the variable flow oil supply scheme, it is proved that the variable flow oil supply scheme can achieve the purpose of adapting the elbow rod bearing to the change of load and adaptively adjusting the oil film thickness. A curve of variable flow rate during upsetting period is given.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TG315;TH133.36

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