A kind of microwave solidification method and device of water glass sand extruded microhammer 3D printing

Abstract

The invention relates to a microwave curing method and device for extruding microhammer three-dimensional printing of water glass sand. The device includes an xy two-axis moving mechanism, a nozzle mechanism, a microwave emission mechanism and a lifting workbench. The nozzle mechanism includes a shell, a rubber nozzle, Lifting mechanism, concave-convex guide post and pear-shaped micro-hammer head, the lower end of the shell is provided with a rubber nozzle, the cavity is provided with a concave-convex guide post, and a micro-hammer head is provided under the concave-convex guide post, and the micro-hammer head is set in the rubber nozzle. The guide column is fixed on the lifting mechanism, and the lifting mechanism is used to drive the concave-convex guide column to move up and down, so that the mixed slurry in the cavity flows from the rubber nozzle to the lifting table, and drives the micro-hammer to move up and down by driving the concave-convex guide column , to hammer the mixed slurry on the lifting table, and the microwave emitting mechanism is used to emit microwaves to the mixed slurry on the lifting table, so as to carry out targeted curing of the mixed slurry. It can realize direct extrusion of sand mixture (cleaning-free), micro-hammer molding and microwave targeted curing.

Description

Technical field [0001] The present invention relates to a kind of water glass sand green casting field, specifically relates to a kind of water glass sand extrusion micro-hammer three-dimensional printing microwave curing method and apparatus. Background [0002] Sand type three-dimensional printing technology is currently the focus of international molding process. The traditional sand molding process is generally: CAD design→ pretreatment→ tooling fixture manufacturing→ sand molding manufacturing → casting, the cycle is 4 weeks or even longer; The process of three-dimensional printing is: CAD design → pre-treatment→ sand printing → casting, the fastest words can be completed in 5 days, the delivery time is calculated according to "days" instead of "weeks", eliminating a lot of expensive and cumbersome intermediate links, and can also process parts materials that are difficult to manufacture by traditional methods, such as gradient material parts, multi-material parts, etc., whi...

AI Technical Summary

Problems solved by technology

[0008] Ye Chunsheng and others from Huazhong University of Science and Technology invented a method of rapid prototyping of water glass sand molds. This method explores a 3D printing method using microwaves as a curing method. This method uses two actions of binder jetting and molding sand laying. The mixing agent and molding sand are not evenly mixed, and the molding sand is not densified during curing, and the supporting sand without binder needs to be removed after forming; especially in this invention, the microwave heating device is placed directly above the workbench, when it falls Turn on the microwave when it reaches the surface of the workbench. This microwave design method without a protective cover has the hazard of leakage, and the microwave energy source is too close to the workbench, and there is also the possibility of collision and damage to the precision microwave energy source equipment. The microwave energy does not Guided synchrotron radiation in all directions will greatly reduce microwave efficiency

[0009] Looking at the current research status of sand mold 3D printing at home and abroad, it can be found that the main focus is on forming resin sand or resin-coated sand based on furan, phenolic formaldehyde, etc., and a very small amount of water glass sand is used, and the resin binder used is often very toxic. ;In order to further improve the strength, the amount of resin sand used is very large; after the molding is completed, a post-cleaning process is often required to remove the uncured residual sand in the sand box

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