公开(公告)号：US20240139799A1

公开(公告)日：2024-05-02

申请号：US18031012

申请日：2022-09-05

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Zhongde SHAN ,  Haoqin YANG ,  Jianpei SHI ,  Qinjiang LIU ,  Yufeng DAI ,  Wanneng LIAO

IPC: B22C9/02 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y80/00

CPC classification number: B22C9/02 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y80/00

Abstract: An ultrasonic-assisted permeation and homogenization molding device and method for frozen printing liquid drops are provided. The device includes an ultrasonic generator, a transducer and an amplitude-change pole. The ultrasonic generator generates 20 KHz low-frequency ultrasonic waves, and a flange plate is arranged on a pitch surface of the amplitude-change pole and connected with an outer cavity wall of the low-temperature molding chamber by threads. According to the ultrasonic-assisted permeation and homogenization molding method for frozen printing liquid drops, pre-paved molding sand particles are homogenized and distributed under ultrasonic vibration by adjusting the frequency of the ultrasonic generator in a sand paving process. When a pure water binder is sprayed, liquid drops are sprayed to the surface of premixed molding sand, and then permeate to the bottom of pre-cooled molding sand under the assistance of low-frequency ultrasonic waves to freeze and solidify.

公开(公告)号：US20230398601A1

公开(公告)日：2023-12-14

申请号：US18037783

申请日：2022-09-05

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Haoqin YANG ,  Zhongde SHAN ,  Qinjiang LIU ,  Jianpei SHI ,  Dandan YAN ,  Shijie DONG

IPC: B22C9/12 ,  B22C9/03

CPC classification number: B22C9/126 ,  B22C9/03

Abstract: A method for preparing a negative pressure film-covering frozen sand mold includes: directly obtaining a mold cavity of a sand mold through numerically controlled machining of a frozen sand blank; covering a surface, brushed with a thermal insulation coating, of the mold cavity of the sand mold with a softened thin film, and covering an outer surface of the sand mold with a back film to seal a sand box; fixing the frozen sand mold in an air extraction sand box with a vacuum chamber, and extracting air through a vacuum pump, so that the thin film tightly adheres to the sand mold through vacuum suction force; and closing the box to obtain an integral sand mold, and pouring a casting at room temperature or low temperature under negative pressure. The method is environment-friendly, and the prepared frozen sand mold has high strength and is convenient for sand cleaning.

公开(公告)号：US20230121449A1

公开(公告)日：2023-04-20

申请号：US17918347

申请日：2022-06-15

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Zhongde SHAN ,  Haoqin YANG ,  Jianpei SHI

IPC: B22C9/02 ,  B33Y30/00 ,  B33Y40/00 ,  B28B1/00

Abstract: An interlayer pre-cooling apparatus for a sand mold freezing printing includes a sand paving apparatus. The sand paving apparatus is located above a negative-pressure low-temperature forming chamber, and the sand paving apparatus includes several independent sand paving grooves, a hollow sand paving roller, a cooling chamber, a sand scraping plate, and an openable and closable baffle. The openable and closable baffle is rotationally arranged at a discharge port of each sand paving apparatus, and the openable and closable baffle is used for paving low temperature premixed sand on demand. The premixed molding sand is further cooled during the process of scraping and compacting low-temperature molding sand. When the apparatus is adopted for sand mold freezing 3D printing, the low temperature of the premixed molding sand is precisely controllable, which has great significance for realizing interlayer pre-cooling of the sand mold freezing printing.