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Ultrasonic auxiliary powder forming method in fluid environment

An ultrasonic-assisted powder forming technology, which is applied in presses, manufacturing tools, etc., can solve the problem of large residual stress and elastic aftereffect of powder forming parts, difficulty in controlling the breakage rate of friction powder particles, and compact density. In order to achieve the effect of high-quality molding preparation, improve fluidity and filling performance, and improve the uniformity of density distribution

Active Publication Date: 2019-06-14
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0002] During the powder hydrostatic pressure forming process, the main factors affecting the density of the compact are: pressure, temperature, friction between particles, particle breakage rate, etc. Since the powder particles are quasi-statically pressurized under hydrostatic pressure, the distance between the powder particles It is difficult to control the friction between them and the breakage rate of powder particles
Limited by the capability of equipment providing pressure and the cognition of powder forming mechanism, improving the density and mechanical properties of the compact by simply increasing the pressure and temperature, optimizing the pressing curve and other process optimization methods has little effect, and too high pressure will This leads to greater internal residual stress and elastic aftereffect of powder molding parts, and internal defects such as cracks are prone to occur; too high temperature will deteriorate the state of the powder particle interface

Method used

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  • Ultrasonic auxiliary powder forming method in fluid environment

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Effect test

Embodiment 1

[0018] An ultrasonic-assisted powder forming method in a fluid environment, comprising the following steps:

[0019] (1) Set up powder molding equipment, including high-pressure airtight containers, jackets, axial ultrasonic transducers and radial ultrasonic transducers. The directional ultrasonic transducer is used to generate axial ultrasonic vibration to push the powder material to produce periodic up and down motion, and the radial ultrasonic transducer is used to generate radial ultrasonic vibration to push the powder material to produce periodic left and right motion; ( 2) Put the powder particles into the package, and put the package containing the powder particles into a closed container; (3) Apply hydrostatic pressure, apply isotropic hydrostatic pressure to the package through the fluid medium, and the package shrinks , which drives the powder particles contained inside to move to the center and squeeze and shrink; after applying hydrostatic pressure, the powder part...

Embodiment 2

[0021] In order to investigate the effect of ultrasound on the molding of granular materials in a static fluid medium environment, the hard granular material M01 and the soft granular material M02 were used for compression molding. The results showed that at 80MPa and room temperature, the Granular materials M01 and M02 can hardly be condensed into shape; after applying ultrasound, the harder granular material M01 is formed by about 30mm column segments, and there are a large number of agglomerated agglomerates, while the softer granular material M02 has achieved almost complete Forming, indicating that ultrasound can significantly promote the formation of granular materials in a fluid medium environment.

Embodiment 3

[0023] Using the soft powder material M03 as raw material, the pressed blank was prepared by ultrasonic-assisted powder hydrostatic pressure molding process, according to image 3 At the sampling position, a φ20mm×20mm sample was extracted, and its apparent density was measured, such as Figure 4 It is shown that under the action of 80MPa hydrostatic pressure, the application of ultrasound can increase the compact density by about 1.25% (from 1.634g / cm 3 to 1.654g / cm 3 ); under the action of 130MPa hydrostatic pressure, the application of ultrasound can increase the compact density by about 2.15% (from 1.739g / cm 3 to 1.776g / cm 3 ). The above results show that ultrasound can promote the increase of powder material molding density under the condition of fluid medium environment.

[0024] In the process of forming powder particles, the patent of the present invention applies longitudinal vibration to the powder through the axial transducer, and applies transverse vibration to...

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Abstract

The invention discloses an ultrasonic auxiliary powder forming method in the fluid environment. Firstly, powder particles are formed under the action of hydrostatic pressure, the density of powder pressing blanks reaches about 80% of the theoretical density of the powder pressing blanks, application of the hydrostatic pressure is kept, power ultrasounds are introduced, and the powder pressing blanks are further densified and are uniform in stress under the ultrasonic vibration action. According to the ultrasonic auxiliary powder forming method in the fluid environment, the power ultrasounds are introduced in the powder particle hydrostatic pressure forming process, mobility and filling performance of the powder particles are improved, and the pressure needed for densification is reduced; and meanwhile, the density distribution uniformity of the formed pressing blanks can be improved, accordingly, residual stress of the powder pressing blanks is reduced, and the mechanical performance of the powder pressing blanks is improved. Meanwhile, the mechanical vibration action generated during spreading of ultrasonic waves in an oil medium, the ultrasonic cavitation effect, the heat actiongenerated due to sound wave absorption through the medium and the like are utilized, viscosity of the fluid medium can be obviously reduced, and the purpose of improving mobility of the fluid medium is achieved.

Description

technical field [0001] The invention relates to the technical field of powder molding, in particular to an ultrasonic-assisted powder molding method in a fluid environment. Background technique [0002] During the powder hydrostatic pressure forming process, the main factors affecting the density of the compact are: pressure, temperature, friction between particles, particle breakage rate, etc. Since the powder particles are quasi-statically pressurized under hydrostatic pressure, the distance between the powder particles It is difficult to control the friction between them and the breakage rate of powder particles. Limited by the capability of equipment providing pressure and the cognition of powder forming mechanism, improving the density and mechanical properties of the compact by simply increasing the pressure and temperature, optimizing the pressing curve and other process optimization methods has little effect, and too high pressure will As a result, the internal resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B30B12/00B30B15/26B30B15/00B30B15/30
Inventor 杨坤吕珂臻董向阳高科徐程洪
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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