Copper alloy powder 3D printing method

Abstract

The invention discloses a copper alloy powder 3D printing method. The method comprises the steps that 1, copper alloy powder is weighed, screened and dried; 2, three-dimensional CAD model processing is carried out; 3, the dried copper alloy powder is poured into a powder tank, an SLM forming machine is prepared and carries out pretreatment on a base plate, the base plate and a scraper are installed, and powder is preset and laid; 4, a laser head is controlled by a galvanometer scanning system to act, the power of the laser head is 200-500 W, the scanning velocity V is 50-300 mm / s, the scanning distance is 0.07-0.09 mm, the powder laying thickness d is 20 micrometers, and the laser spot diameter is 120-140 micrometers. By selecting laser wavelength, powder and other data and carrying out annealing heat treatment after molding, the technical problems that laser molding of copper alloy is difficult and copper is likely to be cracked after being molded due to high heat conductivity and high light reflectivity are solved.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a copper alloy powder 3D printing method. Background technique [0002] SLM technology is a technology that uses metal powder to be completely melted under the heat of a laser beam, and then cooled and solidified to form a shape. In order to completely melt the metal powder, the laser energy density is required to exceed 10 6 W / cm 2 . Lasers currently used in SLM technology mainly include Nd-YAG lasers, CO 2 Lasers, fiber lasers, the laser wavelengths generated by these lasers are 1064nm, 10640nm, 1090nm respectively. The absorption rate of metal powder to shorter wavelength lasers such as 1064nm is relatively high, while the absorption rate to longer wavelength lasers such as 10640nm is low. Therefore, in the process of forming metal parts, the laser energy utilization rate of the shorter wavelength laser is high. If the longer wavelength CO 2 Laser, the laser energy u...

AI Technical Summary

Problems solved by technology

[0008] Difficulties in copper alloy 3D printing: 1) Copper alloy laser has high reflectivity and is not easy to absorb; 2) Thermal conductivity is too high, and energy is guided away; 3) Poor solderability, easy to sprout and grow cracks; 4) Unstable molding, uneven surface , related to surface tension; 5) Zinc in brass has a low vaporization point, is volatile, changes composition, and contaminates optical components

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