Coaxial powder feeding nozzle for adjusting powder flow converging focal point in pneumatic mode

Abstract

The invention discloses a coaxial powder feeding nozzle for adjusting a powder flow converging focal point in a pneumatic mode. The coaxial powder feeding nozzle comprises a laser head, a sleeve, a coaxial powder feeding head, a powder feeding cavity, a water jacket and a water cooling cavity, the sleeve is connected below the laser head, the coaxial powder feeding head is connected below the sleeve, a focusing lens is arranged above the sleeve, a protective lens is arranged at the upper end of the coaxial powder feeding head, the powder feeding cavity is a conical annular cavity formed between the outer wall of the coaxial powder feeding head and the water jacket, the powder feeding cavity is divided into an inner cavity and an outer cavity through an isolation plate and adjusting stirring pieces, the water cooling cavity is connected with a water inlet and a water outlet, the multiple adjusting stirring pieces are provided, are uniformly distributed in the circumferential direction and are connected to the lower end of the isolation plate, and the adjusting stirring pieces can deflect relative to the coaxial powder feeding head. According to the coaxial powder feeding nozzle, theadjustment of the powder flow converging focal point is realized in the pneumatic mode, so that the advantages that the structure is simple, the reaction is sensitive, the adjusting range is wide andthe like are achieved.

Description

technical field [0001] The invention belongs to the field of advanced laser manufacturing, and in particular relates to a coaxial powder feeding nozzle which can pneumatically adjust the focal point of powder converging. Background technique [0002] The preparation of high-performance alloy coatings on the surface of key parts is of great significance to improving the service life of parts and the reliability of mechanical products. The alloy coating prepared by synchronous powder-feeding laser cladding technology has the advantages of high bonding strength, small dilution rate, small heat-affected zone and thermal deformation of parts, strong material adaptability, and easy realization of automatic production. Therefore, synchronous powder feeding laser cladding technology has gradually become a widely used material surface modification technology. [0003] In synchronous powder feeding laser cladding technology, powder delivery is a key link in the process. There are ma...

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Problems solved by technology

Generally, the focus point of the powder flow is not adjustable, which affects the

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