Adjustable high-speed laser cladding annular coaxial powder feeding nozzle and its adjustment method

Abstract

The invention discloses an adjustable high-speed laser cladding annular coaxial powder feeding nozzle. The adjustable high-speed laser cladding annular coaxial powder feeding nozzle comprises a centering basal body and a nozzle coaxially arranged; a focusing module sleeves the outer periphery of the centering basal body; the focusing module is connected with the nozzle, and drives the centering basal body to axially move to adjust gaps between a laser focal point and the surfaces of workpieces; the centering basal body extends in the radial direction to form a centering part; a centering end plate is arranged at the upper end of the centering part; the lower end of the centering end plate is fixedly connected with a centering base; a cavity for movably adjusting the centering basal body isformed between the centering base and the centering basal body; a horizontal adjusting piece for horizontally adjusting the centering basal body is arranged on the outer side of the centering base; and a dip angle adjusting piece for adjusting the axle inclination of the centering basal body is arranged at the upper end of the centering end plate. compared with the prior art, the adjustable high-speed laser cladding annular coaxial powder feeding nozzle can realize precise centering of the powder spot axle and the light spot axle and control of the defocusing amount, improves the powder utilization rate, and achieves a better cladding effect.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to an adjustable high-speed laser cladding annular coaxial powder feeding nozzle. Background technique [0002] High-speed laser cladding is an emerging surface modification technology. At this stage, it is mainly used to form a layer of functional coating different from the base material on the metal surface. It can effectively improve and enhance the surface properties of the base material, so as to improve the Wear resistance, corrosion resistance and other properties, the traditional laser cladding is that the laser directly heats the part matrix to form a molten pool, and the extra powder falls into the molten pool and melts to form a thicker coating; while the high-speed laser cladding changes the laser and powder. In the process of action, let the laser directly heat the powder above the substrate, so that the powder forms a molten or semi-molten state and then falls o...

AI Technical Summary

Problems solved by technology

[0003] In the application of high-speed laser cladding technology, it is necessary to adjust the defocus amount of the nozzle (the distance between the laser focus and the workpiece) and the coaxiality of the laser powder (the axis of the powder spot is coaxial with the axis of the laser beam), the defocus amount and the coaxial alignment of the laser powder The effect of heat treatment has a direct impact. When the defocus amount is too large, the power density acting on the workpiece is too low to achieve the purpose of processing the workpiece; when the defocus amount is too small, the power density acting on the workpiece is too high, which is easy to Melt the laser irradiation point and damage the surface of the workpiece; when the axis of the laser powder deviates, the cladding layer on the surface of the workpiece is uneven and the cladding effect is poor. In the prior art, the defocus amount is usually adjusted by directly moving the laser head, but The amount of adjustment is limited, a large adjustment range cannot be achieved, and the powder distance cannot be guaranteed; the coaxial adjustment of the laser powder is usually adjusted by the jig to adjust the horizontal position of the nozzle. Although the intersection of the powder spot and the laser beam can be adjusted, the powder spot cannot be guaranteed. The axis of the laser beam coincides precisely with the axis of the laser beam in the same plane, the error is large, the controllability is low, it is not conducive to process adjustment, and the cladding quality cannot be guaranteed

Images