Ladder type stress ring synthetic diamond mold

Abstract

The invention relates to a ladder type stress ring synthetic diamond mold which is characterized by comprising a pressure cylinder (1), prestressed rings (2) and a protective ring (3), wherein the axial height of each layer of prestressed rings (2) is in a ladder shape, and the upper end surface and the lower end surface of each layer of prestressed rings (2) are inclined planes with lower inside, high outside and an inclination of 2-15 degress; the prestressed rings (2) are installed in the protective ring (3); the pressure cylinder (1), the prestressed rings (2) and the protective ring (3) are tightly sleeved together by utilizing interference fitting; and according to difference of the size of mold internal pressure, a layer amount of the prestressed rings (2) can be 3-6. In the ladder type stress ring synthetic diamond mold, each prestressed ring (2) is in the ladder shape, and the upper and lower end surfaces have a certain inclination, thereby benefiting to forming a multilayer prestressed structure and strengthening the bearing capability of the mold, ensuring good interference effect, prolonging the service life of the mold and enhancing the quality and the production efficiency of a synthetic diamond.

Description

Technical field: [0001] The invention relates to a stepped prestressed ring synthetic diamond mold, which belongs to the technical field of precision forming and mold structure design. Background technique: [0002] In the working environment of diamond synthesis, the pressure on the surface of the mold cavity is as high as 6-10GPa, and the temperature is as high as 1500-2000°C, which requires very high load-bearing capacity of the mold. Due to the limited tensile strength of the mold material, ordinary monolithic molds are difficult to withstand the huge tangential tensile stress during the working process, and are prone to cracks leading to damage, or excessive deformation of the cavity resulting in excessive dimensional accuracy of the product and other problems. Therefore, the prestressed ring combination mold is commonly used in engineering. Through the radial prestress acting on the outer surface of the mold, the stress distribution inside the mold can be changed, the ...

AI Technical Summary

Problems solved by technology

[0003] The existing two-sided top artificial diamond mold often has shortcomings such as short mold life, low production efficiency, and uneven material of large-sized products.

For example, the two-sided top mold proposed by H.T.Hall of the American GE company has moderate high-pressure strokes and good pressure stability, and can obtain high-grade artificial diamonds, but the outer prestressed ring often breaks and fails, and the mold life is low; There are multi-layer prestressing rings on the outside of the diamond synthesis mold, and the pressure cylinder is placed in the middle of the prestressing ring. The diamond synthesis cavity is small and the production efficiency is low, which does not meet the requirements of large synthesis cavity.

[0004] Therefore, how to improve the structure of the mold and improve the quality and production efficiency of synthetic diamond under the condition of limited tensile strength of the mold material in view of the problems of cracking and failure, low service life, high production cost and low product grade of the diamond synthetic mold, Prolonging the service life of diamond synthetic molds has become an important problem to be solved urgently

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