NTR镦锻机肘杆液体静压轴承设计

发布时间：2018-03-11 04:39

本文选题：镦锻机　切入点：肘杆轴承　出处：《燕山大学》2014年硕士论文　论文类型：学位论文

【摘要】：镦锻机是卧式曲柄压力机的一类，其低速重载的工况条件对肘杆轴承的工作性能提出很高的要求。肘杆轴承在工作过程中，载荷变化幅度大，轴颈耦合变形大，且工作空间受限，因此，现有的采用恒流量供油的低速重载液体静压轴承无法满足镦锻机的安全运行要求。本文根据肘杆轴承的低速重载和载荷变化幅度大的工况特点，开展轴承性能分析和结构优化设计研究，提出能适应载荷变化并自适应调整油膜厚度的变流量供油方案。论文主要内容如下： (1)根据液体静压肘杆轴承的功能及性能参数要求，制定了轴承结构优化设计方案，建立了油膜方程及边界条件，计算了轴承的静特性，为后续的分析与优化奠定基础。 (2)采取理论分析方法，分析了油腔结构参数、包角及径向间隙等参数对轴承性能的影响规律，通过轴承油膜的流体仿真和轴颈弹流耦合分析，得到了油膜压力场和轴颈的弹流耦合变形，根据理论分析结果确定了轴承最优结构参数，完成了轴承结构参数的优化设计。 (3)以轴承许用油膜厚度和最大许用油膜压力为轴承供油流量设计的约束条件，，适应载荷变化并自适应调整油膜厚度为优化目标，运用油膜厚度等效替代的方法，开展变流量供油方案优化研究。通过计算满载工况下各个油腔的供油流量及验算轴承卸载后油膜厚度，证明恒流量供油无法满足轴承在整个工作过程的承载要求；运用理论计算和有限元的方法，完成了轴承变流量供油方案的设计，通过变流量供油方案的可行性分析证明了此变流量供油方案能够实现肘杆轴承满足适应载荷变化并自适应调整油膜厚度的目的；最后，给出了一个镦锻周期内的变流量供油曲线。
[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.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TG315;TH133.36

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