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A nozzle air pressure adjustment device capable of improving sealing performance

A technology of air pressure adjustment and sealing performance, which is applied in the field of additive manufacturing to achieve the effects of improving molding accuracy, ensuring structural design, and increasing service life

Active Publication Date: 2020-08-28
BEIJING UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] Aiming at the problems in the background technology, the present invention provides a nozzle air pressure adjustment device for improving the sealing performance in the droplet spraying process. In actual production, it is of great significance to overcome the difficulty of adjusting the pressure of high-temperature gas. The device is easy to operate, has a wide range of applications, and has high scientific research and application value. The technical scheme adopted is as follows:

Method used

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  • A nozzle air pressure adjustment device capable of improving sealing performance
  • A nozzle air pressure adjustment device capable of improving sealing performance
  • A nozzle air pressure adjustment device capable of improving sealing performance

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] a) Due to the need to ensure the stability of the air pressure inside the cavity, there is a high requirement on the sealing performance, and at the same time, it must be able to work under high temperature conditions, so the method of bolt fastening and sealant is used for sealing.

[0025] b) In order to reduce the energy dissipation during the working process of the pneumatic nozzle and ensure the stability of the air pressure acting on the molten metal surface, the cone angle of the processed nozzle should be less than 90°, and the aspect ratio should be 1.

[0026] c) In order to ensure the service life of the pneumatic nozzle and nozzle, the materials are made of high temperature resistant stainless steel.

[0027] d) In order to improve the spraying effect of the pneumatic nozzle, the cavity volume of the spray chamber (10) is set as a c...

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Abstract

The invention discloses a nozzle air pressure adjusting device with improved sealing performance, and belongs to the technical field of additive manufacturing. The nozzle air pressure adjusting devicecomprises two parts, namely a nozzle device and a gas supply device, wherein the nozzle device is mainly composed of a graphite crucible, and the nozzle device comprises a lower sealing channel, a lower positioning hole, a spraying cavity, a graphite crucible and a spraying hole; the air supply device is mainly composed of an upper air supply cover, and the air supply device comprises an air inlet, an adjusting screw rod, an air outlet, an upper positioning hole, a sensor threaded hole and an upper sealing channel. In a high-temperature metal micro-droplet jetting process, to solve the problems that the sealing performance of the device is poor and outlet air pressure is difficult to adjust, the pneumatic type on-demand jetting device can realize the effect of stabilizing pressure in thespraying cavity through a simple and rapid sealing manner, and can accurately adjust the pressure at the outlet to meet working requirements under different conditions.

Description

technical field [0001] The invention relates to a nozzle air pressure regulating device which can be used to improve the sealing performance in the droplet spraying process, 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 parts, flexible...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/115B33Y30/00
CPCB22F3/115B33Y30/00
Inventor 刘赵淼钟希祥逄燕徐元迪任彦霖
Owner BEIJING UNIV OF TECH
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