Abstract:

In order to obtain a higher pressure capacity, the camber-type and plane-type double-layered split ultrahigh pressure dies were investigated. The stress distributions and pressure capacities of the two types of ultrahigh pressure dies were studied by finite element method. The results show that the novel plane-type double-layered split ultrahigh pressure die can effectively decrease the stress levels of the cylinder and first layer supporting ring. The pressure capacity of ultrahigh pressure die is significantly improved accordingly. Compared with the camber-type double-layered split ultrahigh pressure die, the Mises stress and maximum shear stress on the cylinder of plane-type double-layered split ultrahigh pressure die are decreased by 27.2% and 33.2%, respectively. Meanwhile, the Mises stress and maximum shear stress of the first layer supporting ring are decreased by 14.8% and 4.7%, respectively. The pressure capacities of the plane-type double-layered split ultrahigh pressure die are increase by 35.6% and 47.1% according to the maximum distortion energy criterion and maximum shear stress criterion. The experimental results show that novel plane-type double-layered split ultrahigh pressure die has a remarkably higher pressure capacity.

Key words: material synthesis and processing technology, synthesize under high pressure, split-type die, pressure capacity, numerical simulation