Shielding-free laser-path-coaxial powder conveying method and shielding-free laser-path-coaxial powder conveying device

Abstract

The invention discloses a shielding-free laser -path-coaxial powder conveying method and a shielding-free laser-path-coaxial powder conveying device. The shielding-free laser-path-coaxial powder conveying method includes the steps of (1) forming a non-laser area and a laser area in an optical path formed by the fact that a laser beam is focused on a base material focus point via an annular reflecting and focusing mirror; (2) arranging a powder conveying pipe, which is used for conveying powder materials to the base material focus point, in the non-laser area to be kept away from laser radiation, and enabling a spraying nozzle of the powder conveying pipe to be coaxial with the center of the laser beam. The shielding-free laser-path-coaxial powder conveying method and the shielding-free laser-path-coaxial powder conveying device have the advantages that the powder conveying pipe is kept away from direct radiation of high-power laser and prevented from being damaged, and complete coaxiality of the laser and powder conveying is achieved.

Description

technical field [0001] The invention relates to the fields of laser powder forming and manufacturing and laser cladding, in particular to a coaxial powder feeding method and a powder feeding device without shielding the laser light path. Background technique [0002] With the development of science and technology, laser cladding forming technology is more and more widely used in the production process. Laser cladding forming refers to the metal raw material (powder or wire) which is melted and transported by laser under the direct drive of CAD model, which is scanned, melted and piled up layer by layer to directly form dense metal parts. One of the most critical technologies in this forming is how to deliver the laser and the material to be processed to the processing area synchronously for optical material coupling forming. [0003] The existing feeding methods are divided into two types: optical external oblique axis feeding and optical internal coaxial feeding. [0004]...

AI Technical Summary

Problems solved by technology

This method realizes the complete coaxiality of the focused beam and the feeding material, but the wire feeding tube needs to cross the beam when it reaches the hollow area from the outside of the ring cone beam, and when the laser is irradiated on the light-facing surface of the wire feeding tube, a lot of heat will be generated , and when the heat is too large, the wire feeding tube will be melted and the entire optical wire feeding device will fail. Therefore, this method is only suitable for small and medium power laser processing, and has certain limitations.

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