Powder distributing method based on close stacking of metal 3D printing spherical powder

Abstract

The invention provides a powder distributing method based on close stacking of metal 3D printing spherical powder, and belongs to the field of quick forming. The method comprises the following steps: step 1, obtaining a single-grain-size sphere stacking model by using face-centered cubic structures; step 2, filling five types of grain-size spheres in gaps by using the face-centered cubic structures as basic structures; step 3, calculating the basic structures through matlab by using structures of the five types of filled grain-size spheres; step 4, defining that a one-time sphere number of five-grain-size filling structures with one-time sphere radiuses from 1 mu m to 100 mu m follows one Gaussian distribution in the matlab; and step 5, making frequency distribution curves in different grain size ranges and an accumulated volume distribution curve by using a drawing command in the matlab. By the method, shortcomings of theoretical analysis correlational studies in the field of powder distribution are overcome, printing operation of a metal 3D printer is guided effectively, printing precision of real object printing is improved, and errors are reduced.

Description

technical field [0001] The invention relates to a closely packed powder mixing method for metal 3D printing spherical powder, which is mainly used for powder mixing in the process of rapid prototyping, for improving the precision of formed parts and reducing errors, and belongs to the field of rapid prototyping. Background technique [0002] Today's market environment is undergoing tremendous changes. On the one hand, consumers' needs are increasingly personalized and diversified; on the other hand, product manufacturers are all focusing on the fierce competition in the global market. Faced with such a rapidly changing and unpredictable buyer's market, manufacturers must not only quickly design products that meet people's consumption needs, but also produce them quickly in order to seize the market. The traditional mass production mode responds slowly to the market and cannot quickly respond to market demand. For this reason, industrialized countries have been working hard ...

AI Technical Summary

Problems solved by technology

[0005] Although rapid prototyping technology can form many metal parts with complex shapes in principle, there are still problems such as insufficient density, low dimensional accuracy, and poor surface quality in the actual processing process.

An important reason for the above problems is that there are defects and deficiencies in the powder used for printing.

In 3D printing, a very important link is the ratio of metal powder. The ratio of metal powder seriously affects the shrinkage rate, dimensional accuracy and shape accuracy of 3D printed parts, thus affecting the printing accuracy.

[0006] Since there is not a complete set of theories and data to guide the research on the ratio of metal powders at home and abroad, some powders often cannot achieve good dense accumulation during the powder spreading process, resulting in low precision and performance degradation of printed products.

The problem of powder seriously limits the application of 3D printing technology, so we invented a powder mixing method based on the close packing of metal 3D printing spherical powder to guide the powder mixing work better

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