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A kind of 3dp preparation method of integral sand mold

An integral, 3DP technology, applied in casting molding equipment, cores, molds, etc., can solve problems such as failure of sand mold preparation of nozzles, blockage of nozzles, etc.

Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A kind of 3dp preparation method of integral sand mold
  • A kind of 3dp preparation method of integral sand mold
  • A kind of 3dp preparation method of integral sand mold

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preparation example Construction

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

[0030] S1, mix sodium silicate powder, disodium hydrogen phosphate powder and 3D printing molding sand, fully stir until mixed evenly, to obtain 3DP molding material; wherein the particle size of 3D printing molding 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 in a volume ratio of (1:1)-(1.5:1), dissolve sodium silicate powder in the mixed solution until the solution is saturated, and then stand and filter A clear solution is obtained, and the obtained clear solution is used as an inorganic binder;

[0032] S3, using the above-ment...

Embodiment 1

[0051] Using the 3DP preparation method of the integrated sand mold of the present embodiment to manufacture a sand mold of a large-scale integrated high-pressure multi-way valve body with a large number of complex internal flow channels, the following steps are included:

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

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

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

Embodiment 2

[0062] Utilize the 3DP preparation method of the integral sand mold of the present embodiment to manufacture the sand mold of the hydraulic pump body, including 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, fully stir until the mixture is uniform, to obtain 3DP molding material; wherein, the content of sodium silicate powder is quartz 10% of the sand quality, disodium hydrogen phosphate powder content is 3% of the quartz sand quality;

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

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

[0066] S4, wi...

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Abstract

The invention discloses a 3DP preparation method of a monolithic sand mold, which includes the following processes: 3DP molding is performed by using a 3DP molding material and an inorganic binder, the obtained monolithic sand mold is statically solidified, and the 3DP molding material is sodium silicate The powder, disodium hydrogen phosphate powder and 3D printing sand are uniformly mixed; the inorganic binder is obtained by adding sodium silicate powder to a mixture of absolute ethanol and deionized water until the sodium silicate powder is dissolved to saturation and then filtered; Vacuum infiltrate the solidified integral sand mold, so that the integral sand mold can fully absorb the impregnation liquid; then the integral sand mold is strengthened and baked, and then cooled and sprayed on the surface of the integral sand mold; the surface is coated The spray-treated monolithic sand mold is dried to obtain a high-performance monolithic sand mold. The invention can use sodium silicate as a binder to carry out 3DP molding of an integral sand mold, and obtain a high-performance integral sand mold with good performance through an adapted 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 of castings are constantly improving, which greatly improves the The precision casting process of castings is difficult, especially the precision and performance of sand molds are more challenging. The traditional sand mold making process is used to make complex models. The traditional core box production is mainly made by hand, while the sand core is first separated by a core shooter, and then manually assembled to complete the core. The process is complicated, and the combined sand The core precision is low, and the hand-shaped core box often causes...

Claims

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Application Information

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Patent Type & Authority Patents(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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