Efficient laser cladding head capable of achieving hollow light internal self-preheating powder feeding

Abstract

The invention provides an efficient laser cladding head capable of achieving hollow light internal self-preheating powder feeding. The efficient laser cladding head comprises a laser input interface,a one-to-two light splitting reflector arranged on a laser transmission path, two light splitting transmitting mirrors symmetrically arranged about the one-to-two light splitting reflector and two reflectors symmetrically arranged about the one-to-two light splitting reflector. The reflectors are arranged behind the light splitting transmitting mirrors along the laser transmission path. A powder nozzle is further included and is coaxial with the one-to-two light splitting reflector, and a powder outlet of the powder nozzle is arranged on the side away from the one-to-two light splitting reflector. A laser beam input from the laser input interface is split into two beams through the one-to-two light splitting reflector, one part in the two laser beams is converged at the point A after beingreflected by the light splitting transmitting mirrors to form preheated lasers, and the other part in the two laser beams is converged at the point B after being transmitted by the light splitting transmitting mirrors and reflected by the reflectors to form cladding lasers. The point A and the point B are located on the injection path of the powder nozzle, and the point A is located above the point B.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency laser cladding and laser additive manufacturing, and relates to a high-efficiency laser cladding head for self-preheating powder feeding in a hollow light. Background technique [0002] At present, in the laser cladding technology, the powder feeding method used in the forming mostly adopts multi-powder tubes to uniformly distribute the light and feed the powder coaxially on the outside. The powder conveyed outside the light will be parabolic, resulting in low convergence accuracy of multi-powder beams, uneven distribution of powder density on the cross-section of powder flow, low coupling efficiency between laser beam and powder, relatively rough surface of formed parts, and low utilization rate of metal powder. Low, generally only 20%-30%. [0003] Most of the existing powder feeding methods do not preheat the metal powder. During the cladding forming process, it is easy to cause residu...

AI Technical Summary

Problems solved by technology

The powder conveyed outside the light will be parabolic, resulting in low convergence accuracy of multi-powder beams, uneven distribution of powder density on the cross-section of powder flow, low coupling efficiency between laser beam and powder, relatively rough surface of formed parts, and low utilization rate of metal powder. Low, generally only 20%-30%

[0003] Most of the existing powder feeding methods do not preheat the metal powder. During the cladding forming process, it is easy to cause residual stress caused by temperature difference and phase change, forming pores, cracks, etc. in the cladding layer. fracture

[0004] In summary, in order to solve the relatively low utilization rate of metal powder, overcome the defects caused by temperature difference and phase change in the cladding process, improve the coupling efficiency of light powder, and achieve high-efficiency and high-quality cladding forming, it is necessary to develop a lifting light powder Coupling, using laser preheating and laser cladding in one high-efficiency cladding head

Images