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Auxiliary airflow type pneumatic on-demand sprayer for reducing diameter of metal droplet

A spray device and air flow technology, applied in the field of additive manufacturing, can solve the problems of restricting the development of metal droplet spraying additive manufacturing technology and affecting the quality of formed parts, achieving a simple structure, ensuring original performance, and improving molding accuracy. Effect

Active Publication Date: 2018-12-21
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, in the metal droplet jet additive manufacturing technology, the forming process is restricted by the size of the metal droplet, which affects the quality of the formed part and limits the development of the metal droplet jet additive manufacturing technology.

Method used

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  • Auxiliary airflow type pneumatic on-demand sprayer for reducing diameter of metal droplet
  • Auxiliary airflow type pneumatic on-demand sprayer for reducing diameter of metal droplet
  • Auxiliary airflow type pneumatic on-demand sprayer for reducing diameter of metal droplet

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] a) Since the invention needs to ensure the size of the droplet generation, it has higher requirements on the diameter of the nozzle hole (8), and the diameter of the nozzle hole (8) is between 50 μm and 200 μm. The setting of the nozzle (7) can facilitate the replacement of nozzles (7) of different sizes. Simultaneously, problems such as difficulty in handling when the nozzle (7) is blocked can also be avoided.

[0023] b) In order to reduce the energy dissipation in the working process of the pneumatic nozzle, the cone angle of the processed nozzle (7) should be less than 90°.

[0024] c) In order to ensure the service life of the pneumatic nozzle (5) and the nozzle (7), the materials are all processed from high temperature resistant ceramics and nickel-chromium alloy.

[0025] d) In order to improve the spraying effect of the pneumatic nozz...

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Abstract

The invention discloses an auxiliary airflow type pneumatic on-demand sprayer for reducing diameters of metal droplets, which belongs to the technical field of additive manufacturing. The auxiliary airflow type pneumatic on-demand sprayer comprises three parts: a heater, a sprayer, and an auxiliary air circuit device. The heater is mainly composed of a heating ring; the sprayer is mainly composedof an alloy casing, a nozzle casing, a nozzle, an end cover and the like; the auxiliary airflow device is mainly composed of an auxiliary airflow disk. In 3D printing, the on-demand sprayer can reducethe diameters of the droplets by adjusting the airflow of the auxiliary air circuit for a situation that the diameter of the nozzle cannot be continuously reduced, and can also be used for adjustingsome special cases that it is easy to oxidize when special metals are sprayed and the like; the forming precision is effectively improved, the original performances of the materials are ensured, and the working requirements under different conditions are satisfied.

Description

technical field [0001] The invention relates to an auxiliary airflow type pneumatic on-demand spraying device which can be used in droplet spraying to reduce the diameter of metal droplets, and belongs to the technical field of additive manufacturing. Background technique [0002] Metal droplet jet additive manufacturing technology is a 3D printing technology developed based on the principle of inkjet printing. Based on the "discrete-superposition" forming principle, the liquid metal is first controlled to generate uniform droplets, and then the droplets are deposited on a specific position of the substrate through the movement of the substrate to achieve point-by-point and layer-by-layer accumulation to form a complex three-dimensional solid structure. This technology has the advantages of simple process flow, low production cost, high density of formed parts, and good mechanical properties. It has broad application prospects in the fields of rapid prototyping of tiny metal...

Claims

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Application Information

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IPC IPC(8): B22F3/115B33Y30/00
CPCB22F3/115B33Y30/00
Inventor 刘赵淼钟希祥徐元迪逄燕
Owner BEIJING UNIV OF TECH
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