Method of electric arc fuse additive manufacturing of metal lattice structure and product

Abstract

The invention belongs to the related technical field of lattice structure manufacturing and processing, and discloses a method of electric arc fuse additive manufacturing of a metal lattice structure.On one hand, the pulse waveform of power output is controlled, so that the transition of one pulse and one drop is realized, the size and number of molten drops can be accurately controlled, and thediameter of a unit rod of the lattice structure is controlled; on the other hand, the lifting capacity and offset in a printing path are controlled, so that the angle of the unit rod of the lattice structure can be accurately controlled, and the electric arc fuse additive manufacturing of the lattice structure of any structure is realized. The invention further discloses a corresponding product. According to the method, the defects and deficiencies of various preparation lattice structures in the prior art can be effectively overcome, and additionally, the method has the advantages of high processing quality and low material requirement and is suitable for any complex form and large sizes.

Description

technical field [0001] The invention belongs to the technical field related to the manufacturing and processing of lattice structures, and more specifically relates to a method and product for additively manufacturing metal lattice structures by arc fuses. Background technique [0002] The so-called lattice structure is a space grid-like ordered porous structure composed of nodes and connecting rod units. Because of its light weight, high specific strength, heat insulation, energy absorption and shock absorption, and noise reduction and many other advantages, it is widely used in aerospace and other fields, and can be used, for example, to manufacture skin heat insulation layers for hypersonic vehicles . [0003] The manufacturing methods of lattice structure in the prior art mainly include investment casting, stretched mesh folding method and extrusion wire cutting method, etc., but these methods have extremely high requirements on the materials used to manufacture lattice...

AI Technical Summary

Problems solved by technology

However, further studies have shown that the current process for processing lattice structures based on additive manufacturing technology is mainly selective laser melting (Selective Laser Melting, SLM), which has exposed the following deficiencies in practice: 1. , this method adopts the method of spreading powder to carry out regional melting with laser, but materials such as aluminum and copper alloy have low absorption rate of laser light, resulting in unmelted phenomenon and unfused defects in the process of regional melting

At the same time, the surface of powder materials such as aluminum and copper alloys is easily oxidized, which significantly reduces the wettability of the material, causing the surface of the molten metal to shrink into a spherical shape during SLM forming, resulting in a spheroidization effect, which prevents the molten metal from solidifying to form a smooth and continuous molten pool, resulting in the formation of Defects, when serious, will prevent the powder spreading roller from moving, and eventually lead to the inability to form components, so it is difficult to apply in the process of forming a lattice structure; secondly, SLM technology will be limited by the laser power and the deflection angle of the scanning galvanometer. It makes it impossible to form larger-sized metal parts. At the same time, it is difficult to manufacture metal powder, and it is easy to be polluted and has low utilization rate, which increases the cost

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