The Stiffness Research And Testing Of Heavy Isothermal Forging Hydraulic Press

Isothermal forging hydraulic press is the basis manufacturing equipment of the large aircraft, aviation and military. With the rapid development in the field of aerospace, how to produce high precision titanium alloy forgings has become a big problem. Isothermal forging hydraulic press is an important equipment to finish forging process of titanium alloy. And how to make the high stiffness of the series equipment is particularly important. This paper takes THP11D-20000 as the test object, it is studied that the hydraulic machine rigidity detection, finite element simulation, the optimization scheme and modal analysis.1. The THP11D-20000 isothermal forging hydraulic press is tested. Stiffness test specification is made sure. Using strain gauge to test in 200 MN heavy duty NC superplastic isothermal forging hydraulic press, hydraulic machine rigidity testing is completed under different load, which can verify the reliability design of heavy overall combination frame body structure. And the deformation law of the hydraulic machine is expressed in mathematical expression, nonlinear regression equation is obtained and the characteristic curve of hydraulic machine is draw.2. Hydraulic press-die coupling model is set up, the hydraulic press of stiffness and strength are obtained by the finite element analysis method in full load condition; the finite element analysis result was compared with the test results, which can verify the accuracy of the simulation results.3. Hydraulic machine is optimized design. By stiffness sensitivity analysis and sensitivity analysis, Variable is selected that can influence stiffness and mass. The parameterized finite element model is established. Using the Box-Behnken Design(BBD) design method, it draws the fitting equation and the analysis of variance of the response surface model, the optimization objective is rigidity and quality. The deflection of upper beam decreased 0.256 mm. The deflection of lower beam decreased 0.012 mm. The mass of upper beam decreased 3.92 t. The mass of lower beam decreased 39.31 t.4. This paper introduces the concept of the finite element modal analysis and theory. The frame of hydraulic press is analyzed by finite element instate of prestressing force and full load-pretightening condition. It obtained the frame of the top six order modal natural frequencies and corresponding inherent vibration mode Anchor bolt stress have alternation phenomenon in the five order vibration mode, the material may crack or fatigue fracture. Each order natural frequency in5~17Hz, falls within the scope of sound, it will produce a certain amount of noise, and therefore, we should be paid attention to noise pollution.