| Hydraulic press is foundational equipment of manufacturing industry.Multi-direction and single-position hydraulic press can meet the requirement of precision plastic forming,is a development direction of the future.Multi-direction CNC hydraulic press is based on the design of the forging process of steering nut,and its frame structure is relatively complex.The deformation of hydraulic press body and its key parts of die has an important influence on the movement and precision forging.Therefore,studying on the deformation laws of hydraulic press body and its die is necessary.The main research contents and results of this thesis are as follows:1)In this thesis,from the initial design drawings of hydraulic press,three dimensional model of hydraulic press is established using SolidWorks software,and the structure,assembly,contact type of hydraulic press are analyzed.Material mechanics and finite element method are combined to calculate intensity and stiffness of hydraulic press,and the beams which do not meet the requirement of the stiffness are put forward improvement schemes.The results show that:The stiffness of the upper beam is weak,and other beams meet the stiffness requirement,the upper beam is optimized,its stiffness increased by 36%,and can meet the design requirements;The stress distribution of hydraulic press is uniform,its body stress is about 60?80MPa,which meets the strength requirement.2)The modal analysis of multi-direction hydraulic press is carried out by the finite element numerical simulation,the general modal analysis and the prestressed modal analysis of the hydraulic press are studied in detail.The results show that:the minimum natural frequency of hydraulic press is about 23Hz,far greater than the operating frequency,will not occur resonance;Within allowable limits,it can be considered that the pretension load has little effect on the mode.3)Study on the deformation of hydraulic press body and its key parts to the influence of mold movement behavior.Mainly from the joint clearances to study,and the optimization criterion of the improvement of beam structure is proposed through the combination of finite element simulation and theoretical derivation.Based on the principle of joint clearances and through the goal driven optimization design,the improved scheme of the beam is put forward and is used to design in the actual production of hydraulic press body.The results show that:by increasing number and thickness of stiffened panel,the side beam's ?? is reduced by about 53%,and optimizational results can meet the requirements.According to the joint clearance and forging accuracy requirements,considering the impact of the deformation of hydraulic press body and its key dies,a method for designing the structure of hydraulic press is put forward,and the method is innovative.The research results can provide theoretical supports for the structural design of hydraulic press,and improve the overall working performance. |
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