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Nozzle arrangement for forming a stable molten metal column

A nozzle device and molten metal technology, applied in the field of metallurgy, can solve problems such as melt dispersion production efficiency, small droplet discontinuity, and pore formation

Active Publication Date: 2020-09-29
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Spray molding is an existing relatively mature metal rapid prototyping technology. The premise of this technology is to disperse the large-volume metal melt. The principle is to use high-pressure inert gas to atomize the alloy liquid flow into fine droplets. The structure is relatively mature and perfect, but the disadvantage of this dispersion method is that the dispersed micro-droplets are discontinuous, and the molten droplets are engulfed by inert gas, which is easy to form pores in the ingot, and the melt is over-dispersed, resulting in low production efficiency

Method used

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  • Nozzle arrangement for forming a stable molten metal column
  • Nozzle arrangement for forming a stable molten metal column
  • Nozzle arrangement for forming a stable molten metal column

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the device includes: upper and lower chambers 2, 5 and a sealing layer 3 arranged therebetween, wherein: the upper chamber 2 is provided with a melt 6, the lower chamber 5 is provided with a condensation mechanism 7, and the upper chamber A nozzle 4 is provided between the body 2 and the lower cavity 5, and the melt 6 is solidified on the condensing mechanism 7 in the form of a continuous micro-melt flow through the nozzle 4 by the pressure difference between the upper and lower cavity.

[0017] The nozzle is used to connect two cavities, and the end of the nozzle is provided with a micro flow channel.

[0018] Such as figure 2 As shown, the nozzle is provided with a heating mechanism outside, and the heating mechanism includes: an outer layer heating body 10, a thermocouple 11 and a temperature control device 12,

[0019] Such as image 3 As shown, the nozzle is made of ceramic material, the diameter of the inner cavity of the nozzle is d...

Embodiment 2

[0023] The structure of the nozzle used in this embodiment is specifically: inner cavity diameter d1=82mm, wall thickness δ=5mm, total height h1=8.6cm, height h2=1.5cm from the bottom of the inner cavity to the bottom surface, and microchannel length h3=1.2 cm, opening angle θ1 of the inner cavity bottom surface = 120°, opening angle of the outer bottom surface θ2 = 175°, diameter d2 of the narrowest part of the microchannel = 1.5mm, and diameter of the widest part of the microchannel d3 = 2mm. Silicon steel molten steel is sprayed with conical micro-channel nozzles. The melt temperature is 1650°C. When the total pressure difference A-B between the upper and lower nozzles is 2000 Pa, the molten steel forms a continuous liquid column micro-divergent injection state, and the injection flow rate is 600g / min.

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Abstract

The invention provides a nozzle device for forming stable metal melt liquid columns. The nozzle device comprises an upper cavity, a lower cavity and a sealing layer arranged between the upper cavity and the lower cavity. Melt is arranged in the upper cavity, a condensation mechanism is arranged in the lower cavity, a nozzle is arranged between the upper cavity and the lower cavity, and the melt issolidified on the condensation mechanism in a continuous micro melt flow manner through the nozzle by means of the pressure difference between the upper cavity and the lower cavity. The large-size high-temperature melt at the temperature (T) of 300 DEG C can be dispersed into continuous micro melt flow, namely the stable metal melt liquid columns, and rapid metal forming is achieved.

Description

technical field [0001] The invention relates to a technology in the field of metallurgy, in particular to a nozzle device for forming a stable metal melt liquid column. Background technique [0002] Additive manufacturing is based on the principle of discrete accumulation, which is a new method of producing metal products different from the traditional casting method. Additive manufacturing can be achieved in a number of ways. In the disclosed technology, the material can be that the powder is melted by the heat source to form a local micro-melt pool, or the wire is melted by the heat source to form liquid droplets, or the large-volume melt is directly dispersed into a metal micro-melt. body flow. It is more difficult to disperse large volume melts. [0003] Spray molding is an existing relatively mature metal rapid prototyping technology. The premise of this technology is to disperse the large-volume metal melt. The principle is to use high-pressure inert gas to atomize ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/115B33Y30/00
CPCB22F3/003B22F3/115B33Y30/00
Inventor 张佼孙宝德东青
Owner SHANGHAI JIAOTONG UNIV