Title:
METHOD FOR PREPARING NEGATIVE-PRESSURE FILM-COATED FROZEN SAND MOLD
Document Type and Number:
WIPO Patent Application WO/2023/221341
Kind Code:
A1
Abstract:
The present invention provides a method for preparing a negative-pressure film-coated frozen sand mold. The method for preparing the frozen sand mold comprises the following steps: numerical control processing is directly performed on a frozen sand blank to obtain a sand mold cavity; a softened thin film is coated on the surface of the sand mold cavity coated with a heat insulation coating, and meanwhile, a back film is coated on the outer surface of the sand mold to close a sand box; an air extraction sand box provided with a vacuum air chamber is used for fixing the frozen sand mold, air extraction is performed by means of a vacuum pump, and the thin film is tightly attached to the sand mold by means of vacuum suction force; and the whole sand mold is obtained after boxes are combined, negative pressure is kept, and a casting is poured in a normal-temperature or low-temperature environment. The method is environment-friendly and green, and the prepared frozen sand mold is high in strength and convenient to clear sand; the volume of gas generated in the pouring process is small, metal is rapidly solidified, and castings having good internal quality, high size precision, and excellent surface quality can be produced.
Inventors:
YANG HAOQIN (CN)
SHAN ZHONGDE (CN)
LIU QINJIANG (CN)
SHI JIANPEI (CN)
YAN DANDAN (CN)
DONG SHIJIE (CN)
SHAN ZHONGDE (CN)
LIU QINJIANG (CN)
SHI JIANPEI (CN)
YAN DANDAN (CN)
DONG SHIJIE (CN)
Application Number:
PCT/CN2022/117063
Publication Date:
November 23, 2023
Filing Date:
September 05, 2022
Export Citation:
Assignee:
UNIV NANJING AERONAUTICS & ASTRONAUTICS (CN)
International Classes:
B22D18/06
Foreign References:
| CN114888265A | 2022-08-12 | |||
| CN105665637A | 2016-06-15 | |||
| CN113579161A | 2021-11-02 | |||
| CN110102713A | 2019-08-09 | |||
| CN104399882A | 2015-03-11 | |||
| CN114472804A | 2022-05-13 | |||
| CN101823122A | 2010-09-08 | |||
| JP2012040569A | 2012-03-01 |
Attorney, Agent or Firm:
NANJING ZHONGLIAN PATENT AGENCY CO., LTD. (CN)
Download PDF: