Shell-making method of investment casting of flow guiding body

Abstract

The invention provides a method for producing a shell of a guiding piece through investment casting, which comprises the following steps: (1) producing a mould shell through sizing the guiding piece with three layers of slurries including sizing a surface layer once and sizing a transition layer twice, plugging up a flow passage at the water inlet end by using paste Morley slurry after the shell is dried, spraying zircon sands of which the particle size is between 100 and 120 meshes from the water outlet end by a sand spraying machine, wherein the paste Morley slurry is prepared through evenly mixing the Morley powder of which the particle size is 200 meshes and silicasol according to the mass proportion of 80 to 20 and then prepared the mixture into paste; (2) placing the mould shell sprayed with fine sands on vibratory equipment to compact the zircon sands sprayed from the water outlet end through vibrating; and (3) conventionally stuccoing the mould shell treated in the step (2). The mould shell produced by the method after casting has the advantages of no shell leakage and no drill steel; the mould shell can be separated through vibrating the shell by a shell vibrating machine when the sands are removed so that the sand removal efficiency is greatly increased by about 80 percent; and the drying time when the shell is produced is reduced by 55 percent so that the energy waste is reduced and the production cost is reduced.

Description

technical field [0001] The invention relates to a shell-making method for easy-clearing sand after dipping and pouring a flow channel of a guide body, which belongs to the shell-making process of investment casting silica sol. Background technique [0002] In the shell making of the investment casting silica sol process, most of them adopt the shell making technology of: surface layer---transition layer---back layer (repeat once or more)---seal layer. However, for the deep and curved flow guide channel, it has always been a difficult problem in the precision casting industry to clean the flow channel after being dipped in slurry. The main reason is that the flow channel is narrow and curved, and the mold shell is not easy to dry, resulting in steel breakout and quality decline. ; Secondly, due to the high-temperature pouring in the runner, the mold shell has poor collapsibility after high-temperature sintering; the third is that the runner is narrow, long and curved, and the...

AI Technical Summary

Problems solved by technology

It mainly solves the problem that the flow channel of the diversion body is difficult to remove sand after being dipped in slurry and poured.

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