Coaxial powder feeding system for quickly molding and producing functional gradient material with laser

Abstract

The invention relates to a coaxial powder feeding system of laser rapid prototyping preparation function gradient material, comprising a powder inlet device, and the powder is absorbed and conveyed by carrier gas. The powder inlet device is communicated with a powder mixer through a first conveying pipe. The powder mixer is used for mixing the powder which has been conveyed. The mixed powder enters into a powder separate device through a second conveying pie. The powder separate device is used for separating the mixed powder into multi-path. The powder separate device is communicated with the powder inlet of a nozzle through a third conveying pipe. The nozzle makes the multi-path powder flock together in a molten pool formed by laser. The function gradient material is prepared under the cladding action of laser and powder. The mix of the powder is uniform. The coaxial powder feeding system has good power feeding property, which can realize the optimum processing, and at the same time, can be suitable for different processing distances. The powder utilization rate is high. The manufacturing accuracy is good. At the same time, the powder conveying distance can be adjusted with a certain scope, and so the coaxial powder feeding system can not be limited to the manufacturing space.

Description

technical field [0001] The invention relates to a powder feeding system for preparing functionally graded materials in the technical field of material compounding, in particular to a coaxial powder feeding system for preparing functionally graded materials by laser rapid prototyping. Background technique [0002] The research and development of functionally graded materials began in 1987 as a "basic technology research on the development of functionally graded materials for relieving thermal stress" project of the Japan Science and Technology Agency. The so-called functionally graded material is based on the requirements of use, chooses to use two materials with different properties, and adopts advanced material composite technology to make the composition and structure of the middle change continuously in a gradient, and there is no obvious interface inside, so that the properties and functions of the material can be improved. A new type of composite material that also has ...

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Problems solved by technology

The method of preparing functionally graded materials by pre-coating powder is relatively simple. First, mix the mixed powders A and B in different proportions and grind them evenly, and then coat the mixed powders on the surface of the matrix material sample in advance. And the laser power is adjusted by itself, and then the laser beam is used to irradiate the pre-set layer on the surface of the remelted sample to form an alloyed layer of AB. The disadvantage of this method is that the powder is not mixed uniformly, it is difficult to form a functionally graded material in the true sense, and the powder is wasted. more

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