Ultrasonic spray-forming method

A technology of ultrasonic jetting and gas jetting, which is applied in the field of ultrasonic jetting forming, can solve problems such as difficulty in atomizer processing, loose deposition structure, etc., and achieve the effect of rapid solidification structure characteristics, uniform microstructure, and fine grains

Inactive Publication Date: 2012-02-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the processing of the atomizer is difficult, and due to overemphasis on cooling efficiency, the deposition structure is loose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] Example: Taking Al-2.2Mg-9.8Zn-2.4Cu (mass fraction, %) alloy to produce cylindrical billet as an example to illustrate the specific implementation:

[0024] (1) First vacuumize the atomization chamber to 5Pa, and then backfill with argon to 90kpa;

[0025] (2) Maintain the superheat of the alloy solution at 100°C, and the molten metal flows to the surface of the arc-shaped tool head through the backflow tube with an inner diameter of 5mm. Under the action of ultrasonic vibration, atomized into metal droplets;

[0026] (3) Adjust the accelerating gas pressure to 0.3Mpa, the nozzle gas temperature is 10℃, the gas flow is doped with SiC powder, the powder flow rate is 50g per minute, and the flying distance is controlled to 600mm, so that the solid fraction of the atomized droplets before deposition is about 60 %~70%;

[0027] (4) The semi-solid metal droplet is driven by the high-speed airflow to hit the deposition disk. The computer controls the deposition disk to rotate aroun...

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PUM

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Abstract

The invention relates to an ultrasonic spray-forming method, which is technically characterized in that: a novel molten metal atomization and deposition manner is provided according to the fundamental principle that molten metal flow is atomized into fine grains by spray-forming; and the fundamental principle of the manner is that: the molten metal flows on the surface of a tool head which vibrates at ultrasonic frequency to form a thin liquid layer; surface tension waves are surged under the action of ultrasonic vibration; liquid drops depart from wave crests when the amplitude of a vibrating surface reaches a certain value; the liquid drops rapidly hit a deposition plate or a collector and are fast solidified under the drive of high-speed inert gas; and metal blanks with required shapescan be manufactured through controlling the position and the angle of a receiver by using different shapes of collectors. The crystal grain of a microstructure of the manufactured blanks is finer.

Description

Technical field [0001] The invention relates to an ultrasonic spray forming method, a method for preparing alloys and metal matrix composite material parts by spray forming technology, in particular to a metal atomization deposition method. Background technique [0002] Spray forming is a unique rapid solidification process in which molten metal is atomized into liquid particles of 10-200 microns, and then driven by high-speed airflow, tiny particles are directly sprayed on the corresponding cooler receiver, such as Deposit the tray or mold cavity to form the corresponding product. Compared with the casting process, the formed high-quality material has a fine, equiaxed, homogeneous and non-segregated microstructure; compared with the rapid solidification powder metallurgy process, the spray-formed blank has low oxygen content and superior comprehensive mechanical properties. There are few forming procedures, low production cost, and high production efficiency; in addition, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115
Inventor 张贤杰王俊彪李玉军司朝润潘艾刚曹小宝
Owner NORTHWESTERN POLYTECHNICAL UNIV
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