An external reinforcement system for 3D printed cores

Abstract

The invention applies to the field of 3D printing mold core casting production, and particularly relates to an external reinforcement system of a 3D printing mold core. The system comprises a double-layer sand box, a negative pressure system and gas blocking thin films, wherein the double-layer sand box comprises an inner box, a bottom plate, cushion blocks, an outer box and a top plate, the negative pressure system comprises a gas pumping connector, an electronic control regulating valve, a connecting pipe, a purification tank and a vacuum pump, and the gas blocking thin films include a plastic thin film covering the top of the sand box and a plastic thin film covering the periphery of the 3D mold core, and are used for preventing external gas and gas in the mold core from entering the sand box, so that a sealed state is formed inside the sand box, and a negative pressure state is formed when the negative pressure operates. With the external reinforcement system of the 3D printing mold core, the external strength of the 3D printing mold core is improved so that the 3D printing mold core can resist the buoyancy of molten iron; and because the used dry sand can be recycled, the production cost is greatly reduced, and the system can meet the requirements of the production processes of various castings.

Description

technical field [0001] The invention is applied in the field of 3D printing core casting production, and in particular relates to an external reinforcement system for a 3D printing core. Background technique [0002] With the promotion and application of 3D printing technology, the method of using 3D printing cores for casting production has gradually become popular in the industry. The casting process includes core printing, flow coating drying, sand core assembly and pouring, and finally the obtained Castings are required. This technology does not need to use molds to make shapes, and does not need to consider the problems of mold removal and material withdrawal in traditional processes. It can realize one-time high-precision printing of various complex structure cores, increases the flexibility of casting process design methods, and saves mold manufacturing. The cost is very suitable for the casting of test pieces or small batches of castings; since the cost of 3D printi...

AI Technical Summary

Problems solved by technology

This technology does not need to use molds to make shapes, and does not need to consider the problems of mold removal and material withdrawal in traditional processes. It can realize one-time high-precision printing of various complex structure cores, increases the flexibility of casting process design methods, and saves mold manufacturing. The cost is very suitable for the casting of test pieces or small batches of castings; since the cost of 3D printing core printing is relatively high, in order to save printing costs and shorten the printing cycle, we hope to reduce the design volume of 3D printing cores as much as possible, but in order to To ensure that the sand core has sufficient strength to resist the buoyancy during the molten iron filling process, this requires strengthening the periphery of the sand core

Most of the existing technologies adopt the method of putting the assembled core into a steel sand box, and filling the periphery with resin sand to obtain sufficient peripheral strength. The amount of resin sand leads to an increase in production costs and cannot meet the production needs of various products

For example, the patent document whose publication number is CN103658527A discloses a vacuum-tight molding method for refrigerator freezer blister mold castings, which uses resin sand, which leads to insufficient core strength and easy deformation

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