Carrier gas powder mixing type coaxial powder feeding nozzle for additive manufacturing

Abstract

The invention discloses a carrier gas powder mixing type coaxial powder feeding nozzle for additive manufacturing. The carrier gas powder mixing type coaxial powder feeding nozzle comprises a nozzle body, and the nozzle body comprises a conversion connector, a nozzle base cylinder, a flow guide sleeve, an inner nozzle body and an outer nozzle body; the lower end of the conversion connector is connected with the nozzle base cylinder, and the lower end of the nozzle base cylinder is connected with the outer nozzle body; the flow guide sleeve is in an inverted cone shape and installed in the nozzle base cylinder, and a powder mixing flow guide cavity is formed by enclosing the outer side wall of the flow guide sleeve and the inner side wall of the nozzle base cylinder; the inner nozzle body is located in the outer nozzle body, a powder outlet channel is formed between the inner nozzle body and the outer nozzle body, the upper end of the inner nozzle body is in threaded connection with the small-diameter end of the flow guide sleeve, and the radial size of the powder mixing flow guide cavity is larger than the width of the powder outlet channel; and a main powder feeding port and a doped powder feeding port are formed in the lower part of the nozzle base cylinder. The powder gathering state and the relative positions of light spots and powder spots can be correspondingly adjusted when the laser focusing state changes, superfine doped powder is synchronously doped for main powder in the powder conveying process, and powder aggregates are avoided.

Description

technical field [0001] The invention relates to laser additive manufacturing, in particular to a carrier gas mixed powder coaxial powder feeding nozzle for additive manufacturing. Background technique [0002] Laser additive manufacturing technology has become an emerging advanced manufacturing method for directly and rapidly manufacturing three-dimensional solid metal parts and repairing precious metal parts. It is widely used in aerospace, petrochemical, electronic information, energy and environment industries. In the laser additive manufacturing technology system, laser fusion deposition manufacturing technology uses high-power lasers to directly form dense metal parts. Due to its low cost and good controllability, it has attracted more and more attention from related industries. [0003] The powder feeding system is a very important system in the laser fused deposition manufacturing forming system. As an integral part of the powder feeding system, the powder feeding no...

AI Technical Summary

Problems solved by technology

Moreover, the laser fused deposition manufacturing technology needs to mix and configure the powder uniformly in advance. If the powder particle size is very small, or the main powder needs to be doped with alloy powder with a very fine particle size, it is very easy to mix and configure the powder during the secondary mixing process or Agglomeration occurs during use to form powder agglomerates, which has an extremely adverse effect on the powder feeding state and powder melting behavior

Images