Service Performance Analysis Of 1600MN Die Forging Hydraulic Press Body

With the development of our iron and steel and nuclear power industries,the demand for large mill roll and nuclear power vessel head increases rapidly.Limited by the forming force of hydraulic press,large mill rolls are generally manufactured by free forging,which has the problems of low production efficiency and poor dimensional accuracy.The above problems can be effectively solved by using die forging in large pressure hydraulic press.Nuclear power vessel head belongs to large size irregular forging,which also has high requirements on forming force of press.In order to meet the forming force required for manufacturing large mill rolls and nuclear power vessel head,1600MN die forging hydraulic press came into being.How to ensure the reliable operation of the press is an important issue in the design stage,the press body structure is the bearing part of the whole press,to ensure that it does not break in the work is the foundation of the safe operation of the press,its strength,stiffness analysis and fatigue life prediction is of great significance.In this paper,1600MN die forging hydraulic press as the research object,using numerical simulation method to do the static analysis of 1600MN die forging hydraulic press body structure.The true three-dimensional full contact analysis finite element model of 1600MN die forging hydraulic press body structure was established.The stiffness and strength of the body structure were calculated and analyzed under the central load condition of 1800MN,the partial load condition of 1600MN front and rear,and the partial load condition of 1600MN left and right.The whole deformation of the press body under different load conditions and the stress distribution of the main bearing parts are obtained,and the location of the local high stress area in the structure is revealed.The results of statics analysis show that the strength and stiffness of 1600MN die forging hydraulic press meet the design requirements.In this paper,modal analysis is carried out on the body structure of 1600MN die forging hydraulic press when the moving beam is in the highest position,and the first 10 order natural frequencies and corresponding vibration modes of the structure are obtained.The calculation shows that the fundamental frequency of the press body structure is 0.812Hz,which is far higher than the normal working frequency of the press,and the press body structure will not generate resonance in operation.The dynamic response of the press under7.9 magnitude earthquake load in different directions is calculated.The results show that the stress level of the main bearing parts of the press is always in the elastic range during the earthquake process,and the transverse shaking of the press will not cause the press to overturn.In this paper,the fatigue test specimen of 20Mn Mo Nb,a key component of 1600MN hydraulic die forging press body structure,was prepared.The S-N curve of the material was measured through fatigue tests at different stress levels.The fatigue life of the key parts of the press under the maximum load condition is analyzed by using the finite element software of fatigue life analysis based on the statics analysis results and the fatigue life prediction theory.It is concluded that the life of each part is greater than10~7,so it can be considered that the fatigue failure will not occur in the specified service life of the press.