Stress Analysis and Experiment on a Radial Prism Cavity Split-Type Ultra-High Pressure Die

On the basis of traditional belt type ultra-high pressure die, a new type of prismatic cavity ultra-high pressure die was studied to obtain higher bearing capacity and larger volume of sample cavity. It is characterized in that the cemented carbide cylinder is discrete and combined, and the inner plane of the cavity body is plane, which provides an effective approach to reduce the circumferential tensile stress. Under the action of pre-tightening force, the cylinder block is extruded each other, which provides the effect of large massive support and lateral support. Additionally, the split angle of prismatic cavity is studied. The simulation results show that the larger the split angle, the smaller the pressure of the cylinder. The prismatic cavity cylinder is subjected to compressive stress in radial, circumferential and axial directions. Therefore, its stress condition is close to hydrostatic pressure state, which can effectively improve the service life of the high pressure die. After further study of the stress distribution of pressure cylinder, it is found that the prismatic radial split cylinder has the best performance in all aspects. Compared with belt type cylinder, experimental results show that split cylinder has higher ultimate bearing capacity, and prismatic radial split cylinder owns higher bearing capacity than tangential split cylinder.