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Method for realizing additive manufacturing through cold gas dynamic spray

A technology of cold air power spraying and additive manufacturing, applied in pressure inorganic powder coating and other directions, can solve problems such as difficult additive manufacturing, and achieve the effect of good mechanical properties and high precision

Inactive Publication Date: 2017-05-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, materials that are sensitive to heat and oxidation will change their structure, composition, and various physical parameters after melting, so it is difficult to achieve additive manufacturing through this method.

Method used

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  • Method for realizing additive manufacturing through cold gas dynamic spray
  • Method for realizing additive manufacturing through cold gas dynamic spray
  • Method for realizing additive manufacturing through cold gas dynamic spray

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The spraying particle size is 400-500 mesh pure Al powder, the operating pressure is 1.5MPa, the gas heating temperature is 380°C, and the incident angle is 60°-90°. The injection direction is controlled according to the CAD file program, and the injection distance is moved in accordance with the growth direction to realize the 3D printing of pure aluminum special-shaped parts. In this embodiment, the prepared workpiece has a bonding strength of 40-200 MPa, a porosity of 0.1%-0.5%, and a surface roughness Ra of 40 μm-160 μm. Such as figure 2 As shown, it can be seen from the preparation of aluminum materials by using the cold air power spraying 3D printing technology that the cold air power spraying additive manufacturing technology can manufacture workpieces with complex shapes to a certain extent.

Embodiment 2

[0032] Spray pure Cu powder with a particle size of 325-600 mesh, operating pressure of 2.5MPa, gas heating temperature of 500°C, incident angle of 60°-90°, and the print head rotates with the surface of the opposite conductor. Copper powder is deposited on the surface of the original substrate layer by layer, and the added part has good conductivity after measurement, realizing the additive manufacturing of easily oxidizable materials. In this embodiment, the bonding strength of the prepared workpiece reaches 65-200 MPa, the porosity is 0.2%-1.2%, and the electrical conductivity is close to that of pure copper.

Embodiment 3

[0034] The particle size of spraying is 450-500 mesh amorphous Al powder, the operating pressure is 1.8MPa, the gas heating temperature is 250°C, and the incident angle is 90°. The printing nozzle sprays perpendicular to the direction of the substrate, and the spraying distance moves in accordance with the growth direction to realize the additive manufacturing of amorphous pure aluminum. In this example, the structure of the prepared bulk material has the characteristics of an amorphous structure.

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Abstract

The invention relates to the technical field of additive manufacturing (AM), commonly known as 3D printing, in particular to a method for realizing additive manufacturing through cold gas dynamic spray. A cold gas dynamic spray process is adopted to be combined with computer aided manufacturing, so that a 3D printing technology is realized; different from other conventional thermal 3D printing technologies, the technology is a non-thermal input type (non-smelting) 3D printing technology. Based on the cold gas dynamic spray process, the technology enables particles to impact at a high speed under a solid state, and 3D printing additive manufacturing is realized through strong plastic deformation of the particles and deposition. Meanwhile, an advanced computer aided manufacturing technology is combined, so that complex workpieces with relatively high precision can be manufactured; and in the process, powder does not generate phenomena such as oxidization, burning loss, phase change and structural change. Therefore, the method solves the problem that materials such as alloys, amorphous materials, quasi-crystal materials and nano-crystal materials, which are liable to have phase change and are liable to volatilize at a high temperature, cannot apply the conventional thermal input type (smelting type) 3D printing technology to manufacture workpieces.

Description

[0001] Technical field: [0002] The present invention relates to the field of additive manufacturing (AM), commonly known as 3D printing technology, specifically a method for realizing additive manufacturing (3D printing) by cold-air power spraying——CGDS-AM (non-thermal input type 3D printing technology), which uses air-cooled power Spraying, relying on the kinetic energy of the high-speed movement of particles for rapid deposition, to achieve a new technology of non-melting 3D printing. [0003] Background technique: [0004] 3D printing technology, that is, a kind of rapid manufacturing (RM) technology, it is based on a digital model file, first modeled by computer-aided design (CAD) or computer animation modeling software, and then the built 3D model " "Partition" into layer-by-layer sections, using powdered metal or plastic and other bondable materials to construct objects by layer-by-layer printing. [0005] The forming principle of traditional 3D printing technology is ...

Claims

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Application Information

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IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 熊天英冯博崔新宇吴杰王吉强毛天亮陈金生李铁藩
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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