Super-hemispherical ceramic fairing biscuit forming die and forming method

Abstract

The invention provides a super-hemispheric ceramic fairing biscuit forming die and forming method. The super-hemispheric ceramic fairing biscuit forming die and forming method are used for solving theproblem in the prior art that a fairing in a complex shape is difficult to form. The fairing biscuit forming die comprises a combined male die and a combined female die, and the combined male die iscomposed of a positioning screw, an end cover, four side die blocks and a base die block. The combined female die is composed of two female die half dies and a connecting fastener. A through hole is formed in the center of the circular end cover, and an arc-shaped through hole and a positioning pin hole are formed in the periphery. The base die block and the four side die blocks are encircled to form a super-hemisphere male die which is fixedly connected with the end cover through the positioning pin hole. The two female die half dies form a super-hemisphere female die in an enclosing mode which is fixedly connected with the end cover through the positioning pin hole, and a feeding port and an exhaust port are formed in the end cover and communicated with a cavity. A biscuit prepared through the method is complete in shape, uniform in structure, free of foam building phenomenon, high in yield and easy to demold after being formed, the die can be repeatedly used, the production efficiency is improved, and meanwhile the cost is saved.

Description

technical field [0001] The invention belongs to the field of fairing molding, in particular to a molding die and a molding method for a super hemispherical ceramic fairing blank. Background technique [0002] The fairing is an aerodynamic surface used to reduce gas resistance and interference during high-speed flight. It is usually used in aerospace equipment such as missile warheads, aircraft propellers, and rockets. The fairing material has the characteristics of high strength and high hardness. It is very difficult to process the optical fairing material by mechanical processing. Processing costs are high. Generally, the fairing blank of complex shape is prepared by a near-net size molding method, and then the blank is sintered to obtain a fairing. [0003] The sintering process of the fairing includes hot pressing sintering, preform + pressureless sintering, hot isostatic pressing sintering, etc. Among them, hot pressing sintering can usually only produce products wit...

AI Technical Summary

Problems solved by technology

However, the above-mentioned molds have the following defects in actual operation: (1) the melting point of paraffin wax is low, machining is difficult, and it is difficult to maintain precision; (2) destructive use is not repeatable; (3) heating during demoulding can cause the biscuit Irreversible deformation or cracking due to rapid evaporation of water

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