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Ultrasonic-assisted permeation and homogenization forming device and method for frozen printing liquid drops

An ultrasonic-assisted, printing fluid technology, applied in the field of additive manufacturing and casting, can solve the problems of poor flatness of low-temperature pre-mixed sand, poor forming accuracy of frozen sand molds, and uneven density, so as to improve compactness and prevent deformation And bonding, improve the effect of penetration

Active Publication Date: 2022-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] Aiming at the problem of poor forming accuracy of frozen sand molds at present, the present invention proposes a device and method for ultrasonically assisted infiltration and homogenization of frozen printing droplets. This method mainly solves the problem of poor flatness and dense Inhomogeneity and difficult penetration of droplets between premixed sand layers

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  • Ultrasonic-assisted permeation and homogenization forming device and method for frozen printing liquid drops

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Embodiment Construction

[0025] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

[0026] Such as Figure 1-3 As shown, the ultrasonic-assisted infiltration and homogenization forming device for frozen printing droplets in this embodiment includes an array nozzle 2, a sanding device 1, an ultrasonic generator 3, a transducer 4, a horn 5, and a low-temperature forming chamber 6 . The array nozzle 2 is located on the two-dimensional motion system, and is used...

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Abstract

The invention discloses an ultrasonic-assisted permeation and homogenization forming device and method for frozen printing liquid drops, the ultrasonic-assisted permeation and homogenization forming device comprises an ultrasonic generator, a transducer and an amplitude-change pole, the ultrasonic generator selects 20 KHz low-frequency ultrasonic waves, and a flange plate is arranged on the section surface of the amplitude-change pole and is in threaded connection with the outer cavity wall of a low-temperature forming chamber. According to the ultrasonic-assisted permeation and homogenization forming method for the frozen printing liquid drops, in the sand paving process, pre-paved molding sand particles are subjected to ultrasonic vibration to be homogenized and distributed by adjusting the frequency of an ultrasonic generator; when the pure water binder is sprayed, liquid drops are sprayed to the surface of the pre-mixed molding sand and permeate to the bottom of the pre-cooled molding sand under the assistance of low-frequency ultrasonic waves to be frozen, solidified and formed. The sand mold freezing 3D printing method is adopted for sand mold freezing 3D printing, sand paving is compact and uniform, liquid drop permeation is sufficient, and the sand mold freezing printing forming precision is precise and controllable.

Description

technical field [0001] The invention belongs to the interdisciplinary field of additive manufacturing and casting technology, and can realize high-precision and high-efficiency 3D printing manufacturing technology for frozen sand molds; in particular, it relates to a method for ultrasonic-assisted infiltration and homogenization of frozen printing droplets. Background technique [0002] Three-dimensional inkjet printing (3DP) is one of the most important processes of 3D printing technology in sand casting. Since 3DP uses the method of spraying the binder to provide strength to the sand mold (core), it does not need a laser as a heat source, the equipment cost is relatively low, and there is no shrinkage deformation when curing at room temperature, and it has a large molding size and can produce medium and large sand molds. (core) and complex internal structure and other advantages. Frozen sand 3D printing uses pure water as the binder for sand casting, and freezes the premi...

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Application Information

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IPC IPC(8): B22C9/02B33Y30/00B33Y10/00B33Y40/00
CPCB22C9/02B33Y30/00B33Y10/00B33Y40/00Y02P10/25B33Y80/00
Inventor 单忠德杨浩秦施建培
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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