Laser broadband fusion covering device

Abstract

The invention relates to a laser broadband fusion covering device, and belongs to the field of 3D (three dimensional) formation. A laser beam sent by a laser can be converted and projected on a processing surface for broadband laser fusion covering processing by the laser broadband fusion covering device; the laser broadband fusion covering device comprises a reflecting mirror and a dual-molded- surface reflecting component; the laser beam is reflected to the dual-molded-surface reflecting component by the reflecting mirror; the dual-molded-surface reflecting component comprises an upper reflecting surface and a lower reflecting surface positioned under the upper reflecting surface; the upper reflecting surface is a parabolic focusing molded surface; the lower reflecting surface is a plane; after the upper reflecting surface receives the laser beam, the laser beam is reflected, so that a broadband focusing line spot is formed on the processing surface; after the lower reflecting surface receives the laser beam, the laser beam is reflected, so that a rectangular light spot is formed on the processing surface; the rectangular light spot is positioned at the outer side of the broadband focusing line spot. The laser broadband fusion covering device has the advantages that the technology heat treatment requirements of different materials and structures can be met; the defect probability of fusion layer residual thermal stress, cracks and the like is reduced.

Description

technical field [0001] The invention relates to a laser broadband cladding device, which belongs to the field of 3D forming. Background technique [0002] Laser direct 3D cladding deposition forming of metal and alloy parts, important functional surface cladding strengthening modification, repair and remanufacturing, etc. have great application value and The prospect is the key development direction of the developed countries at present. my country has also clearly listed the basic technology of metal additive manufacturing and the research and development of core basic components as key development areas. Among them, laser broadband cladding is an efficient laser cladding additive manufacturing technology. Laser broadband cladding has a large single-pass forming width, which can reach 10-40mm in one scan (narrow-band cladding is only φ1-5mm), so the cladding efficiency is high; large-area laser broadband cladding can also greatly reduce the number of laps and repeated hea...

AI Technical Summary

Problems solved by technology

[0009] However, the existing double-beam internal broadband powder feeding still has the following problems: due to the sudden cooling and sudden heating of laser cladding, the processing material will produce a large degree of overheating and undercooling, which will easily cause cracking of the molten layer

However, there are few reports on the optical lens group integration method or the integrated nozzle device of the main beam for cladding and the auxiliary beam for preheating and slow cooling.

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