Modeling sand injection curing material-increasing manufacturing method

Abstract

The invention relates to a modeling sand injection curing material-increasing manufacturing method. First, a three-dimensional CAD model of casting modeling is designed according to a casting structure; then layered cross section contour data and layered scan paths are obtained from the model data; different crude sand material and chilling block material information is obtained after analysis; finally detailed information of the layer surface of every layer is obtained and control information is determined; next, according to the current layer surface information, a nozzle is selected, then modeling sand (or chilling block materials) with different materials and meshes is subjected to accurate injection along the current layer scan path, and by utilization of an injection device, binders and curing agents are injected onto modeling sand of every layer accurately; when injection of one layer is finished, a layer height is moved until the required casting modeling is obtained. The casting modeling obtained through the method has strong self-adaptability and good permeability. The later obtained casting has good mechanical properties and usage properties.

Description

technical field [0001] The invention belongs to the digital additive manufacturing technology in the field of rapid manufacturing, and in particular relates to a molding sand injection solidification additive manufacturing method. Background technique [0002] The so-called digital additive manufacturing technology is a new technology of rapid free forming of three-dimensional solids, which combines the advantages of computer graphics processing, digital information and control, laser technology, electromechanical technology and material technology. The technology originated from the "rapid prototyping" technology born in 1988. Rapid prototyping technology adopts a new principle of free forming without mold to manufacture three-dimensional solid parts, which uses the method of gradually increasing materials to form parts. This forming method does not require a mold, which saves a very lengthy mold manufacturing process and expensive mold manufacturing costs. Therefore, it ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a molding sand spray solidification additive manufacturing method to solve the existing additive manufacturing technology due to the use of the same material and the same mesh number of molding sand, and the casting mold manufactured by using the same nozzle has poor air permeability, It is difficult to reduce or eliminate the internal stress of castings and the resulting castings will produce various casting defects such as cracks, deformation and shrinkage porosity

In addition, the molding sand spray solidification additive manufacturing method provided by the present invention can also solve the problem that the prior art cannot simultaneously spray form cold iron

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