Molding method and device for 3D printing ice-mold casting sand mold

Abstract

The invention belongs to the technical field of casting, and discloses a rapid mold-free casting manufacturing method. The method comprises the steps that the temperature of molding sand is decreased to range from minus 40 DEG C to minus 10 DEG C, a computer controls a working platform to move downwards by a certain distance and lays a layer of frozen bottom sand at the low-temperature environment, then, the working platform moves downwards by one layer thickness, a layer of low-temperature molding sand is laid, the computer controls sprayers to spray water or a water solution according to the cross-section shape of the current layer cast mold, and the sand mold is solidified; and printing is performed layer by layer, and a casting mold is obtained. The invention further provides a 3D printing ice-mold casting sand mold device. The device comprises a low-temperature molding chamber, the liftable working platform, a powder spreading device and a two-dimensional motion system. Array nozzles connected with a liquid supply system are installed on the two-dimensional motion system and spray water or the water solution. A feeding system is used for providing low-temperature molding sand. The casting mold manufactured by adopting the method has the beneficial effects of being environment friendly, high in manufacturing speed, low in cost, low in gas generating amount, free of deformation and the like and has the popularization and usage value.

Description

Technical field [0001] The invention belongs to the technical field of casting, and specifically relates to a method for rapid forming of a moldless casting mold and a device for forming a moldless casting mold. Background technique [0002] Most of the current rapid prototype technology (rapid prototype) is based on layered manufacturing technology. The layered manufacturing technology decomposes the processed object into multiple parallel thin layers. During the processing, these thin layers are formed layer by layer and superimposed. manufacture. This process is often realized with the help of computer technology. [0003] There are two main methods commonly used to quickly make foundry sand molds (including sand molds and cores, collectively referred to as casting molds hereinafter) using layered manufacturing technology: [0004] One is to use laser to selectively sinter the coated sand. The basic method is: first lay a layer of coated sand on the worktable and heat it to a t...

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the sand mold resin content is high, it is difficult to remove the sand after the mold is processed, the casting defect rate is high in the subsequent casting process, and it is easy to pollute the environment

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