Sieve hole built-in type annular laser cladding nozzle

Abstract

The invention discloses a sieve hole built-in type annular laser cladding nozzle which comprises a laser head connection part, a middle part sleeve part and a nozzle part; the laser head connection part is composed of an upper connection sleeve which is connected with a laser head; the middle part sleeve part is composed of a sliding sleeve which is connected with the upper connection sleeve; protective glass is arranged between the lower end of the sliding sleeve and the upper end of a center sleeve; a protective glass water cooled jacket is in threaded connection with the sliding sleeve and the center sleeve; a protective gas hole is formed in the center sleeve; a nozzle part is composed of a conical nozzle core which is connected with the center sleeve; and the outer side of each of the conical nozzle core and the center sleeve is sequentially provided with a powder inlet sleeve, a gas inlet sleeve and a water cooled jacket. The sieve hole built-in type annular laser cladding nozzle overcomes the disadvantages that the service life is short, a powder convergence diameter cannot be regulated, and the existing laser cladding nozzle cannot be suitable for powder particles in different sizes.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to an annular coaxial laser cladding nozzle. Background technique [0002] Laser cladding technology is a new surface modification technology. It is a process method that fuses two or more materials with different properties by heating them together to give full play to their excellent properties. Laser cladding has the characteristics of fast heating and cooling speed, and the obtained cladding layer has fine microstructure, high strength, and its performance is obviously better than other cladding methods, so it has attracted extensive attention from material workers all over the world. [0003] The design of powder feeding nozzle for laser cladding is a key technology in laser processing equipment. The function of the powder feeding nozzle is to transform the powder flow from the powder feeder into different shapes and enter the laser beam, which plays a role in control...

AI Technical Summary

Problems solved by technology

In-depth research on coaxial powder feeding nozzles has been carried out at home and abroad, and certain results have been achieved, but there are still many deficiencies, as follows: (1) In the absence of protective gas, the outlet of the powder feeding pipe is easy Clogging, which tends to cause the powder to flow out of the laser beam before reaching the substrate surface, forming areas where the cladding material is non-metallurgically bonded to the substrate

(2) The amount of powder feeding is uneven

During the implementation of the coaxial powder feeding laser cladding process, the flow of the cladding material in the laser beam is divergent, causing the powder spot diameter to exceed the laser spot diameter, and the powder beyond the laser spot diameter range is not fully heated in the laser beam. It will cause the cladding powder and the substrate surface to fail to form a metallurgical bond, which will directly lead to the deterioration of the surface of the formed part, and even lead to collapse in severe cases, making the forming process unable to continue

(3) The powder feeding nozzle cannot realize the precise coaxiality adjustment of the powder and the laser beam, resulting in powder spots and laser beams not being able to achieve coaxial work

(4) The laser beam will reflect on the surface of the substrate, resulting in energy loss. In severe cases, the reflected laser beam may burn the nozzle

(5) The water-cooling pipeline cannot completely cool the lower end of the nozzle, causing the place close to the molten pool to be easily damaged by radiant heat

(6) The protective mirror glass cannot be completely cooled, and local overheating may easily cause the glass to break

The main disadvantage is that the uniformity of the powder flow at the outlet of the nozzle is poor, and the powder is easy to melt and block the powder outlet at the outlet at the bottom end, and the nozzle cannot adjust the diameter of the powder convergence

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