Adjustable laser coaxial powder-feeding nozzle

Abstract

The invention relates to an adjustable laser coaxial powder-feeding nozzle suitable for round-spot laser fluxing and broadband laser fluxing, belonging to the technical field of laser processing. The nozzle has a water-cooling and guiding gas protection structures, is integrally in a hollow conical structure and comprises an upper body and a lower body which are sequentially connected and fixed by a thread. The adjustable laser coaxial powder-feeding nozzle is structurally characterized by being formed by respectively connecting a connecting tube with scale with a laser and a powder-feeding tube, a mechanism capable of vertically adjusting is formed by utilizing the thread, and the powder focus position is accurately adjusted; the lower body comprises one group of three coaxially distributed cones with round outlets and one group of three coaxially distributed cones with rectangular outlets to adjust different facula shapes, different types of faculae are mounted at the lower parts of corresponding outlets, an included angle between a powder channel and the nozzle axis ranges from 40 degrees to 50 degrees, and an included angle between a cooling water channel and the nozzle axis ranges from 30 degrees to 45 degrees.

Description

Technical field: [0001] The invention relates to an adjustable coaxial powder feeding nozzle for laser melting, which is suitable for circular spot laser melting and broadband laser melting, and belongs to the technical field of laser processing. Background technique: [0002] Laser cladding technology is a new technology that has been studied more, developed rapidly, and widely used in laser heat treatment. It is considered to be a new and promising surface modification technology. The powder feeding system is a very important system in the laser cladding system. Laser cladding can be divided into preset and synchronous laser cladding according to the powder feeding method. The synchronous powder feeding method is a relatively advanced and widely used method at present. The powder feeding device used for synchronous powder feeding mainly has two types: unilateral powder feeding and coaxial powder feeding. Among them, the single-side powder feeding method is widely used as...

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Problems solved by technology

[0004] In Chinese patent CN2510502Y, a coaxial powder feeding nozzle is proposed, the main parts of which are connected by bolts. Although the laser focus can be properly adjusted relative to the powder convergence point, there is no scale value for quantification, and the size of the powder conical cavity at the lower end can be adjusted. Adjustment, but after adjustment, powder deposition is easy to occur at the connection, and the adjustment value cannot be measured. This patent is only applicable to circular laser spots, not to square laser spots

U.S. Patent 4724299 proposes a coaxial powder feeding nozzle for laser spraying. Although the laser focus position and the powder focus are adjustable, it is very easy to cause poor powder ejection at the exit to block the nozzle, and it is difficult to replace the damaged nozzle. It is only suitable for round spots.

Chinese patent CN1255411A proposes a vertical loading and unloading split-type laser melting coaxial powder feeding nozzle, which overcomes the deficiency of single-tube lateral powder feeding and melting anisotropy to a certain extent, and is only suitable for pneumatic powder feeding. In the case of powder, there will be powder accumulation inside the nozzle

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