Lateral powder feeding nozzle device applied to laser cladding

Abstract

The invention discloses a lateral powder feeding nozzle device applied to laser cladding. The lateral powder feeding nozzle device comprises a powder discharging nozzle, a sealing ring, a powder feeding pipe, a powder feeding channel, a cooling water jacket, a powder feeding channel and a protecting gas channel, wherein the powder discharging nozzle is dipped in the cooling water jacket, and then the powder discharging nozzle is subjected to sufficient heat radiation so as to work for long time; the powder discharging nozzle is in threaded connection with the powder feeding pipe; the cooling water is prevented from entering the powder feeding channel by using the sealing ring; the central shaft of the powder discharging nozzle is in an included angle of 30-35 degrees with a laser beam; the powder discharging nozzle is provided with 2-3 powder feeding holes of which the diameters are 1.0mm; the included angles among the powder feeding holes are 4-6 degrees; and a rectangular powder spot which is about 1.5mm*5.5mm is formed by three powder feeding holes, so as to realize broadband laser cladding. The oxidation of a laser cladding coating is avoided by introducing a protective gas into the protecting gas channel; the machining precision of the lateral powder feeding nozzle device is easy to ensure; the lateral powder feeding nozzle device can be applied to technical requirements of the broadband laser cladding; and the machining cost is lower.

Description

technical field [0001] The invention relates to a powder feeding nozzle device for laser cladding in the technical field of laser material processing, in particular to a wide-band powder feeding nozzle device for large-area laser cladding. Background technique [0002] Laser cladding refers to placing the selected coating material on the surface of the coated substrate with different filler methods, melting it and a thin layer of the substrate surface at the same time through laser irradiation, and forming a very low dilution after rapid solidification. The base material is formed into a metallurgically bonded surface coating, thereby significantly improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance and electrical properties of the base material surface. This technology uses different feeding methods to place selected cladding materials on the surface of the substrate to be coated. After laser irradiation, it melts with a thin layer of ...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of semiconductor lasers for high-power laser cladding, the width of the rectangular laser beam spot for laser cladding increases, and the existing powder feeding nozzle device for laser cladding is difficult to meet this development requirement

At present, for broadband laser cladding, the cladding powder feeding nozzle device mainly has the following deficiencies: (1) The common feature of the existing coaxial powder feeding nozzle device is that the alloy powder finally converges at a point in front of the nozzle through the conical powder feeding channel , although it has a good powder feeding isotropy in the rapid prototyping process, it is difficult to ensure that it matches the wide-band rectangular laser beam section, and the laser cladding efficiency is reduced; (2) the existing wide-band lateral powder feeding nozzle devices are mostly simple copper The tube is deformed into a rectangular cross-section, and the phenomenon of nozzle powder clogging and poor powder uniformity often occurs during use, and there is no cooling device so that it cannot work for a long time; (3) the protective gas of the existing powder feeding nozzle device is mostly used around the alloy The outer protective gas of the powder, which protects the alloy powder from oxidation. However, due to the cladding alloy layer, especially the easily oxidizable coating materials, such as iron-based, titanium-based, etc., oxidation will occur from solidification to cooling to 500 ° C , the outer protective gas can protect the alloy melt in the laser molten pool, but it cannot guarantee that the cladding layer after solidification will not be oxidized; (4) the existing powder feeding nozzle devices for laser cladding lack the protective gas makeup function, Therefore it is difficult to avoid powder sticking of the cladding coating

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