Research On Components Of Cubic High-pressure Apparatus By Simulation And Testing

The performance and consumption of diamond synthesizing equipment are directly affected by cavity that is expanding with large-scale expansion of cubic high-pressure,so the research on hinge beam and anvil under the conditions of high temperature and pressure and anvils life online tracking and detecting during working are becoming central issue and main content.Based on ANSYS software and acoustic emission detector,the simulation and acoustic emission testing of key components in cubic press were studied.According to the structure size of hinge beam and anvil,the three-dimensional solid model and finite element model were respectively established by Pro/E and ANSYS.The analyses of structure and weight optimization were made by the ANSYS modules of structure analysis and topology optimization.According to simulation results the distributions of stress and strain were got on hinge beam.The edge of convex lugs and the bottom of cylinder were easy damaged and these sites were consistent with actual damaged locations in scene.Based on the finite element results of structure and topology optimization analysis,design variables were reasonable chose to establish the parameterized finite element model of hinge beam,the methods of parameters optimization and artificial optimization were adopted to complete structure optimization design and optimal structure of hinge beam was obtained which 14.36% weight was decreased and the validity was verified by finite element analysis of structure and fatigue.The simulation calculations of anvil temperature field and hot-structure coupling had been made that loads and boundary conditions were obtained combined with actual working conditions.The temperature distribution pattern was got which highest temperature was 194.875℃ located in the center position of top surface and was low on all sides.Besides,the maximum Von Mises stress was 1510 MPa and shear stress was 576 MPa which took place in the small cant and marginal of top surface,which led easy cracking in these positions,and this was corresponded with the actual cracking locations.Based on the finite element analysis and actual cracking location of anvil,acoustic emission test of anvil crack was carried out in laboratory and work field whose corresponding acoustic emission signal was collected during the testing.The correlation analysis,parameter lists,wavelet and spectral analysis methods were applied for acoustic emission signal processing and the results showed that the maximum Felicity ratio for anvil was 0.035 and the typical cracking frequency of anvil was more than 500 KHz with the wave amplitude and greater than 0.005 V.An acoustic emission test system that can be used to monitoring cracking has been developed to track the service life of anvil according to the characteristic of cracking and the demand of practical production.So far,the system has been applied to field test and run in good working condition.