A pressure-relieving side-axis powder feeding nozzle device for laser 3D printers

Abstract

The invention relates to a pressure relief type paraxial powder feeding spray nozzle device for a laser 3D printer. The pressure relief type paraxial powder feeding spray nozzle device comprises a powder tube cavity and a spray nozzle, wherein the powder tube cavity and the spray nozzle are connected together. An end cover is arranged on the top of the powder tube cavity, and a powder feeding connecting pipe is inserted in the axis of the end cover. The pressure relief type paraxial powder feeding spray nozzle device is characterized in that the powder tube cavity comprises a straight tube section, a first conical surface section and a second conical surface section, wherein the straight tube section, the first conical surface section and the second conical surface section are sequentially connected from top to bottom; the spray nozzle is of a funnel type cone structure and comprises a funnel section and a powder spraying hole section communicated with the funnel section, a pressure relief pipe is arranged on the end cover, the powder feeding connecting pipe is inserted into the straight tube section of the powder tube cavity, and a plurality of pressure relief baffles are horizontally fixed to the powder feeding connecting pipe. The pressure relief type paraxial powder feeding spray nozzle device has the advantages that divergence of powder beams is reduced, straightness of the powder beams is improved, the overlap ratio of powder spots and light spots is increased, and the dimensional accuracy and the surface quality of printed workpieces are greatly improved.

Description

technical field [0001] The invention relates to the technical fields of laser printing and laser cladding, in particular to a pressure-relieving side-axis powder feeding nozzle device for a laser 3D printer. Background technique [0002] Laser cladding is an emerging material surface repair technology in recent years. It is an effective means to improve the surface properties of materials, and the powder feeding nozzle is a key component that affects the quality of laser cladding. At present, laser cladding technology has also been widely used in laser 3D printing. In order to improve the dimensional accuracy and surface quality of laser 3D printing molded parts and give full play to the advantages of laser 3D printing, in recent years, researchers have proposed new ideas to improve the concentration of powder feeding powder. . The powder feeding device has coaxial and side shaft powder feeding, etc. According to the existing research at home and abroad, for the side shaft ...

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Problems solved by technology

The powder feeding device has coaxial and side shaft powder feeding, etc. According to the existing research at home and abroad, for the side shaft powder feeding method and device structure, it adopts the first-stage convergent powder feeding without pressure relief function or with pressure relief but only The powder feeding structure with one-stage convergence, when the powder is sprayed from this type of powder feeding structure, there are problems of large powder divergence and low straightness of the powder beam, resulting in low coincidence of powder spots and laser spots and is affected by the degree of powder convergence. The powder utilization rate is relatively low, which increases the production cost

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