Frozen sand mold printing low-temperature nozzle gas follow-up scanning device

Abstract

The invention relates to a low-temperature nozzle gas follow-up scanning device for frozen sand mold printing. The low-temperature nozzle gas follow-up scanning device comprises a printing nozzle, a rack for installing the printing nozzle, a gas nozzle, a fixing support of the gas nozzle, a gas supply pipe and a high-pressure nitrogen supply device. A straight gas inlet pipe is arranged at the upper end of the gas nozzle to be connected with the fixed bracket; an air flow channel is arranged in the straight air inlet pipe and is used for conveying air; an air pipe joint is arranged on the straight air inlet pipe and is connected with the air supply pipe; the high-pressure nitrogen supply device comprises a nitrogen tank and a high-pressure valve arranged at an outlet of the nitrogen tank; a nitrogen accommodating cavity communicated with the gas flow channel is formed in the gas nozzle; and a plurality of nozzles are uniformly distributed at the lower end of the gas spray head and are communicated with the nitrogen accommodating cavity through a gas spraying channel. According to the method, freezing of micro-droplets in the frozen sand mold printing forming process is enhanced, so that the overall strength of the frozen printing sand mold is improved, the frozen sand mold is prevented from collapsing in advance during pouring, and meanwhile, the performance of the obtained casting is improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing of frozen sand molds, and in particular relates to a gas follow-up scanning device for low-temperature nozzles for printing frozen sand molds. Background technique [0002] Traditional casting methods need to rely on wooden molds, metal molds, etc. to turn sand molds for casting. In the manufacture of small batches of personalized products, the production flexibility is poor, the manufacturing cycle is long, and resources are wasted. At the same time, binders such as resin and water glass, which are widely used in the foundry industry, have problems such as high toxicity, high waste discharge, and difficulty in falling sand and collapsing. Frozen sand 3D printing technology uses freezing of water to replace the hardener in the molding sand, and produces less cleaning waste; the product prototype is manufactured by accumulating materials layer by layer. The manufacturing process is highly flexi...

AI Technical Summary

Problems solved by technology

[0003] In the process of practicing frozen sand 3D printing technology, we found that the freezing effect of water, which acts as a hardening agent in the layer-by-layer scanning process, is not ideal

The strength of the sand mold obtained by relying on the natural freezing of water-containing sand particles in the low-temperature environment of the printing process is poor, and the phenomenon that the molten metal is not fixed yet the frozen sand mold collapses in advance during the pouring stage will seriously affect the forming quality of the casting.

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