Manufacturing method of complicated fine hollow sand core

Abstract

The invention relates to a manufacturing method of a complicated fine hollow sand core. The method mainly comprises the following steps of: designing a middle die in the middle of the complicated fine hollow sand core which specifically serves as a split sand core die; designing a bead at a longitudinal axis position, which corresponds to the sand core, on the middle die, wherein the length of the bead is the same as the longitudinal axial length of the sand core; manufacturing a sand core die and two half sand cores; opening the die, making the middle die and a moving die move away from a fixed die at the same time; reserving the half sand core on one side of the fixed die in a fixed die cavity; when the moving die and the middle die move away from the fixed die at the same time to a predetermined position, separating the middle die from the moving die, reserving the half sand core in the moving die in a moving die cavity and moving the middle die away; closing the dies; and opening the die to take the sand core out. The fine hollow sand core is manufactured successfully, the problem of the formation of exhaust holes on a slender sand core is well solved, the technical blank in the field is filled, a fixed thinking mode in the industry is broken through and good technical effect is achieved.

Description

Technical field [0001] The invention relates to a method for manufacturing a sand core for casting, in particular to a method for manufacturing a complex and small hollow sand core. Background technique [0002] Due to the need for weight reduction and energy saving, the design of modern aviation equipment components is becoming more and more sophisticated. In many aviation hydraulic and vapor pressure accessories, such as accessory casings, there are non-straight pore liquid passages that need to be directly cast for transportation. Fuel, hydraulic oil, lubricant and cooling medium, these liquid passages are small, staggered, and complicated, and are sealed in the alloy matrix of the casting. [0003] In part casting, the inner cavity of the casting is formed by the core. For complex cavities, sand cores are usually used. An exhaust channel must be made inside the sand core, because during the casting and molding process of the casting, the sand core is heated by the molten meta...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of vent holes in the fine sand core, so that this fine sand core can be applied in the manufacture of hydraulic and steam pressure accessory castings for aviation equipment with complex inner cavities

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