Method for uniformly mixing powdery metals in real time, and metal 3D printing method and device

Abstract

The invention belongs to the technical field of metal 3D printing powder conveying, and relates to a method for uniformly mixing powdery metals in real time, and a metal 3D printing method and device. The method for uniformly mixing the powdery metals in real time comprises the following steps: 1) the types of the powdery metals needing to be mixed, the particle sizes of the powdery metals and the mixing proportion of different types of the powdery metals are determined according to actual requirements; at least two types of the powdery metals are provided; and 2) inert gas is adopted for feeding different types of the powdery metals into a mixing area to be stirred and mixed till the powdery metals are uniformly stirred. The invention provides the method for uniformly mixing the powdery metals in real time, and the metal 3D printing method and device, which can effectively ensure the uniformity of components, structures and properties of subsequently prepared materials and the overall quality of parts.

Description

technical field [0001] The invention belongs to the technical field of metal 3D printing powder delivery, and relates to a method and a device for uniformly mixing powdery metal, in particular to a method for uniformly mixing powdery metal in real time and a metal 3D printing method and device. Background technique [0002] Metal 3D printing technology is widely used in aerospace, machinery, ships and other fields due to its near-net shape, high material utilization rate, and rapid prototyping. Among them, technologies such as laser three-dimensional forming and electron beam additives, which are mainly based on powder feeding, have laid a good foundation for the rapid preparation of large-scale metal structural parts. In the above technology, the high-energy laser beam / electron beam acts rapidly on the metal substrate and forms a molten pool, and the metal powder enters the molten pool under the action of airflow and undergoes a melting-rapid solidification process, and the...

AI Technical Summary

Problems solved by technology

However, since the powder is ball milled before being put into the powder feeder, some elements with strong adhesion will remain on the inner wall of the ball mill, etc., resulting in the loss of the content of some mixed elements.

Even if the powder has been uniformly stirred in the powder feeder, the composition of the powder that is finally sent to the molten pool will not be consistent with the expected design due to the lack of certain element content in the upstream step.

In addition, the existing powder feeder lacks a powder height transmission system. During the printing process, the remaining powder in the powder feeder can only be roughly estimated by visual observation. When the insufficient powder amount is not discovered in time, it will lead to There is a lack of powder in parts or samples, and the verification affects the quality of subsequent forming

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