Method for preparing 3DP of integral sand mold

An integral, 3DP technology, applied in casting molding equipment, cores, molds, etc., can solve the problems of sand mold preparation failure of sprinkler heads, clogging of sprinkler heads, etc.

Active Publication Date: 2022-02-18
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the sodium silicate solution is used as the binder, the sand mold is directly sprayed according to the existing method, because the sodium silicate droplet is easily solidified at the nozzle after volatilization, thereby blocking the nozzle, causing damage to the nozzle and damage to the sand mold. preparation failed

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  • Method for preparing 3DP of integral sand mold
  • Method for preparing 3DP of integral sand mold
  • Method for preparing 3DP of integral sand mold

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preparation example Construction

[0029] The 3DP preparation method of monolithic sand mold of the present invention comprises the following steps:

[0030] S1, mix sodium silicate powder, disodium hydrogen phosphate powder with 3D printing sand, stir well until mixed evenly, and obtain 3DP molding material; wherein the particle size of 3D printing sand is 70-140 mesh, sodium silicate powder and dihydrogen phosphate The particle size of the sodium powder is 300-500 mesh, the mass of the sodium silicate powder is 8% to 12% of the mass of the 3D printing sand, and the mass of the disodium hydrogen phosphate powder is 2% to 4% of the mass of the 3D printing sand.

[0031] S2, fully mix absolute ethanol and deionized water at a volume ratio of (1:1)-(1.5:1), dissolve sodium silicate powder in the mixed solution until the solution is saturated, then let stand and filter obtain a clear solution, and use the obtained clear solution as an inorganic binder;

[0032] S3, using the above-mentioned 3DP molding material a...

Embodiment 1

[0051] Using the 3DP preparation method of the integral sand mold of this embodiment to manufacture a sand mold of a large integral high-pressure multi-way valve body with a large number of complex internal flow channels includes the following steps:

[0052] S1, mix 300-500 mesh sodium silicate powder, 300-500 mesh disodium hydrogen phosphate powder and 70-140 mesh pearl sand, stir well until the mixture is uniform, and obtain 3DP molding materials; wherein, the content of sodium silicate powder is pearl sand 12% of the mass of sand, and the content of disodium hydrogen phosphate powder is 2% of the mass of Baozhu sand;

[0053] S2, fully mix absolute ethanol and deionized water at a volume ratio of 1:1, dissolve sodium silicate powder in the mixed solution until the solution is saturated, then stand still and filter to obtain a clear solution, and use the obtained clear solution as an inorganic viscous Adhesive;

[0054] S3, using the above-mentioned 3DP molding material an...

Embodiment 2

[0062] Using the 3DP preparation method of the integral sand mold of this embodiment to manufacture the sand mold of the pump body of the hydraulic pump includes the following steps:

[0063] S1, mix 300-500 mesh sodium silicate powder, 300-500 mesh disodium hydrogen phosphate powder and 70-140 mesh quartz sand, stir well until the mixture is uniform, and obtain a 3DP molding material; wherein, the sodium silicate powder content is quartz 10% of the mass of sand, the content of disodium hydrogen phosphate powder is 3% of the mass of quartz sand;

[0064] S2, fully mix absolute ethanol and deionized water at a volume ratio of 1.5:1, dissolve sodium silicate powder in the mixed solution until the solution is saturated, then stand still and filter to obtain a clear solution, and use the obtained clear solution as an inorganic viscose Adhesive;

[0065] S3, using the above-mentioned 3DP molding material and inorganic adhesive as raw materials for 3D printing;

[0066] S4, will b...

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Abstract

The invention discloses a 3DP preparation method of an integral sand mold, which comprises the following processes: 3DP molding is carried out by using a 3DP molding material and an inorganic binder, the obtained integral sand mold is subjected to standing curing, and the 3DP molding material is obtained by uniformly mixing sodium silicate powder, disodium hydrogen phosphate powder and 3D printing molding sand; the inorganic binder is obtained by adding sodium silicate powder into a mixed solution of absolute ethyl alcohol and deionized water until the sodium silicate powder is dissolved to be saturated and then filtering; the cured integral sand mold is subjected to vacuum infiltration, so that the integral sand mold fully absorbs the infiltration liquid; the integral sand mold is subjected to reinforced baking and then cooled, and coating spraying treatment is conducted on the surface of the integral sand mold; and the integral sand mold of which the surface is subjected to coating spraying treatment is dried so as to obtain the high-performance integral sand mold. According to the invention, sodium silicate can be used as a binder to carry out 3DP molding of the integral sand mold, and the high-performance integral sand mold with good performance is obtained through an adaptive post-treatment process.

Description

technical field [0001] The invention belongs to the technical field of sand casting, and in particular relates to a 3DP preparation method of an integral sand mold. Background technique [0002] With the development of engineering technology, the structure of castings has shown a trend of integration and complexity, especially the internal structure has become more and more complex. At the same time, the precision requirements for castings are constantly increasing, which has greatly improved The precision casting process of castings is difficult, especially for the accuracy and performance of sand molds. The traditional sand mold making process makes complex models. The traditional core box is mainly made by hand, while the sand core is first made separately by a core shooter, and then manually assembled. The core precision is low, and the hand-shaped core box often has defects such as shrinkage, shrinkage cavity, and cold-separated trachoma due to improper design of the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C1/18B22C9/12B22C3/00B33Y10/00B33Y40/20B33Y70/00B33Y80/00
CPCB22C9/02B22C1/188B22C1/185B22C9/12B22C3/00B33Y10/00B33Y40/20B33Y70/00B33Y80/00Y02W30/91
Inventor 杨强崔晓涵王富李涤尘
Owner XI AN JIAOTONG UNIV
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