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

A technology of additive manufacturing and coaxial powder feeding, which is applied in the directions of additive manufacturing, additive processing, and process efficiency improvement. Effect

Pending Publication Date: 2021-12-31

CHONGQING UNIV OF TECH

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AI-Extracted 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 s...

Method used

The horizontal portion of the connecting cylinder 23 is evenly provided with four radial adjustment screws 24 in the circumferential direction, and the second axial adjusting cylinder 22 is in an inverted cone shape, and the large diameter end is inserted into the connecting cylinder 23 and the second The tapered surface of the axial adjustment cylinder 22 is in contact with the end of the radial adjustment screw 24 , and the small diameter end is threadedly connected with the inner side wall of the upper end of the nozzle base cylinder 3 . The radial position adjustment of the nozzle base cylinder 3 relative to the connection cylinder 23 is realized by four radial adjustment screws 24 evenly arranged on the horizontal part of the connection cylinder 23, thereby realizing the powder flow spot and the laser spot in the Adjustment of radial position.

The outer wall of the second axial adjustment cylinder 22 is threadedly connected with a second axial positioning ring 26 and a third axial positioning ring 27, and the second axial positioning ring 26 realizes the positioning of the second axial adjustment cylinder 22 Axial positioning, the axial positioning of the nozzle base cylinder 3 is realized through the third axial positio...

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.

Application Domain

Additive manufacturing apparatusIncreasing energy efficiency

Technology Topic

Structural engineeringManufacturing engineering +4

Image

Examples

Experimental program(1)

Example Embodiment

[0031] As a preferred embodiment of the invention, the assembly 2 comprises axial position adjustment and radial adjustment assembly adjusting assembly, the axial adjustment assembly for adjusting the nozzle with respect to the base tube 3 converts the axial position of the joint, the radial adjustment of the nozzle assembly for a radial position with respect to the base of the cylinder, in order to adjust the laser beam exiting the laser focusing head produced relative position between the light spot and the powder flow point of convergence.

[0032] The axial adjustment cylinder assembly 21 includes a first and a second axially adjustable axial adjustment cylinder 22, the longitudinal adjustment assembly comprises an inverted T-shaped connection tube 23. Said first axially adjustable outer cylindrical wall 21 has a first threaded axial positioning ring 25, the upper end of the side wall threaded connection adapter 1, the lower end of the inner cylinder 23 is connected to the upper end of the side wall threaded connection. By adjusting the first position of adjustment ring 25 is positioned axially on the drum 21 in a first axial direction, so that the nozzle 3 relative to the base cylinder 1 achieve a wide range adapter axial movement, facilitate the flow of powder in the powder spot and the laser spot shaft the relative position to make a wide range of adjustment.

[0033] The horizontal portion of the periphery of the connection tube 23 is provided with four radially uniform adjustment screw 24, the second axial adjustment cylinder 22 has an inverted cone, and a second axial adjustment 23 is inserted into the large diameter end of the connecting tube and a radially tapered surface 22 of the cylindrical adjustment screw 24 contacts an end portion, the small diameter end of the nozzle inner cylinder 3 the upper end of the side wall of the base a threaded connection. By adjusting screw 24 in the connecting cylinder portion 23 to achieve the level of four circumferentially uniformly radially disposed with respect to the nozzle seat tube 3 connected to the radial position of the cylinder 23 is adjusted to achieve a flow of powder in the powder spot and the laser spot adjusting the radial position.

[0034] Said second axially adjustable threaded cylindrical outer wall 22 connected to a second axial positioning ring 26 and the third axial positioning ring 27, to achieve the second axial adjustment cylinder 22 is axially positioned by a second positioning ring 26 axially , the base ring 27 of the nozzle to achieve axial positioning cylinder through a third 3 of the axial positioning. By adjusting the axial positioning of the third ring 27 on cylinder 22 adjusts the position in a second axial direction, so that the base of the nozzle 3 relative to the second cylindrical tube 22 to realize a small axial adjustment range of axial movement, to facilitate the flow of powder and powder spots fine-tune the laser spot at the opposite axial positions.

[0035] The connecting cylinder is provided with a cover lens drawer 8, when using a protective lens disposed in the lens protection drawer 8, by radial sliding drawer cover lens 8, lens protection achieve fast installation and uninstallation 23.

[0036] Specifically work, the powder evenly distributed in the body 3 of the nozzle base on the cylinder port 32 and the doped powder feeding powder powder feeding port 32 and the body dopant powder powder powder flow directly into the mixing chamber 7, because the nozzle 3 and 4 corresponding to the base of the cylindrical sidewall of the inner cross-sectional flow sleeve is tapered, and the powder passage gap formed between the inner nozzle 6 and outer nozzle 5 0.5 ~ 2.0mm compared with the radial flow mixing powder chamber 7 width narrow dimensions, thereby making the body and powder doped powder is formed in the mixing powder circulation return flow chamber 7, the main cause of the composition or the powder particle size and thoroughly mixed powder doped, and then delivered into the guide groove 41 along the the powder passage is formed between the outer nozzle 5 and the nozzle 6, the inert gas within the laser powder feeding passage as a carrier, the powder is formed on the workpiece surface to be machined spot. This structure can ensure the powder mixed flow uniformly and stably conveying the powder, the powder can be ensured to avoid the formation of aggregates of different size at the same time homogeneously mixed powder component of the alloy powder doped nanoscale.

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Description & Claims & Application Information

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ActiveCN106123920AGuaranteed uniformity and stabilityLuminous power is stable

Owner:PLA UNIV OF SCI & TECH

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PendingCN113954362AImprove the mixing effectGuaranteed uniformity and stability

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Classification and recommendation of technical efficacy words

Guaranteed uniformity and stability

Ground light source calibration equipment of low-light cloud picture imaging instrument and calibration method of equipment

ActiveCN106123920AGuaranteed uniformity and stabilityLuminous power is stable

Owner:PLA UNIV OF SCI & TECH

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

A technology of additive manufacturing and coaxial powder feeding, which is applied in the directions of additive manufacturing, additive processing, and process efficiency improvement. Effect

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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