Small-angle annular powder feeding nozzle for high-speed laser cladding

Abstract

The small-angle annular powder feeding nozzle comprises a laser channel, a cooling water tank, a powder feeding channel inlet, a conical powder feeding flow channel, a laser outlet and an annular powder feeding outlet, and the laser channel and the laser outlet are formed in an inner cavity of a main body of the small-angle annular powder feeding nozzle from top to bottom; the cooling water tank is formed in a main body of the small-angle annular powder feeding nozzle, a powder feeding channel inlet formed in the main body of the small-angle annular powder feeding nozzle is connected with a conical powder feeding runner, the tail end of the conical powder feeding runner is communicated with an annular powder feeding outlet, and the annular powder feeding outlet is located in the circumferential direction of the laser outlet; the inclination angle between the conical powder feeding flow channel and the axis of the small-angle annular powder feeding nozzle ranges from 12 degrees to 17 degrees. The small-angle annular powder feeding nozzle changes the working distance between the nozzle and a workpiece, so that powder particles are heated by a laser beam to the greatest extent, and high-speed laser cladding is really realized.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a small-angle annular powder feeding nozzle for high-speed laser cladding. Background technique [0002] The parts of many industrial equipment must serve in wear or corrosion environment for a long time, such as hydraulic rods of coal mines, automobile brake discs, high-speed rail axles and rolls, etc. Now the common method is to use electroplating process or thermal spraying process on the surface of parts Create a wear-resistant or corrosion-resistant coating on the surface of the component. However, chrome plating is a highly polluting industry, which is extremely harmful to human health and the environment. In the context of green and environmentally friendly manufacturing, it is imperative to replace highly polluting processes such as electrochrome plating. The thermal spraying process heats and melts the coating material, atomizes it into extremely fine particles ...

AI Technical Summary

Problems solved by technology

The coating produced by the laser cladding process is dense, low in porosity, and the metallurgical bond between the coating and the substrate

However, during the cladding process of laser cladding, a large amount of laser heat acts on the substrate, which will cause the substrate to be excessively melted, and even cause deformation of the substrate.

In addition, the conventional laser cladding speed is about 0.1-1.2m / min, and the efficiency is low, which also greatly limits the application of laser cladding

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