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A kind of coated sand for laser 3D printing and preparation method thereof

A 3D printing and coated sand technology, which is applied in the field of coated sand, can solve the problems of low strength, easy fracture and damage of sintered parts, and achieve the effect of shortening the melting and solidification time, clear outline and high molding precision

Active Publication Date: 2019-10-18
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the initial strength of the sintered parts is low, especially for the thin parts of the sintered parts, which are prone to breakage and damage when the parts are picked up and transferred, and cannot be successfully molded for casting production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The artificial spherical pearl sand is purified by water washing, and the pearl sand with a particle size of 100-250 μm is obtained by sieving five adjacent sands, and then dehydrated and dried.

[0032] The thermoplastic phenolic resins PF-1904 and PFR-1350 were respectively crushed with a high-speed mechanical impact mill and passed through a 100-mesh sieve to obtain a resin powder with a particle size of less than 150 μm, and mixed according to a mass ratio of 1:1 to obtain a mixed resin powder.

[0033] Take 1000g of the above-mentioned purified and dried pearl sand, heat it to 160°C and keep it warm for 2 hours, then quickly pour it into the sand mixer; add 20g of mixed resin powder (PF-1904 phenolic resin 10g, PFR-1350 phenolic resin 10g), 2.5g of coupling agent KH-550 is melted and pre-mixed; when the temperature of the mixture drops to 105°C, add 10g of 30% urotropine aqueous solution, and mix with sand for 30s; then add 0.4g of calcium stearate, and mix with san...

Embodiment 2

[0035] The artificial spherical pearl sand is purified by water washing, and the pearl sand with a particle size of 100-250 μm is obtained by sieving five adjacent sands, and then dehydrated and dried.

[0036]The thermoplastic phenolic resins PF-1904 and PFR-1350 were respectively crushed with a high-speed mechanical impact mill and passed through a 100-mesh sieve to obtain a resin powder with a particle size of less than 150 μm, and mixed according to a mass ratio of 1:1 to obtain a mixed resin powder.

[0037] Take 1000g of the above purified and dried pearl sand, heat it to 180°C and keep it warm for 2 hours, then quickly pour it into the sand mixer; after mixing for 20s, add 25g of mixed resin powder (PF-1904 phenolic resin 12.5g, PFR-1350 phenolic resin Resin 12.5g), coupling agent KH-550 3g for melt premixing; when the mixing temperature drops to 105°C, add 12.5g of 30% urotropine aqueous solution, and mix sand for 50s; then add 1.2g of calcium stearate , mixed sand for...

Embodiment 3

[0039] The artificial spherical pearl sand is purified by water washing, and the pearl sand with a particle size of 100-250 μm is obtained by sieving five adjacent sands, and then dehydrated and dried.

[0040] The thermoplastic phenolic resins PF-1904 and PFR-1350 were respectively crushed with a high-speed mechanical impact mill and passed through a 100-mesh sieve to obtain a resin powder with a particle size of less than 150 μm, and mixed according to a mass ratio of 1:1 to obtain a mixed resin powder.

[0041] Take 1000g of the above purified and dried pearl sand, heat it to 200°C and keep it warm for 2 hours, then quickly pour it into the sand mixer; after mixing for 40s, add 30g of mixed resin powder (PF-1904 phenolic resin 15g, PFR-1350 phenolic resin Resin 15g), coupling agent KH-550 4g for melt premixing; when the mixing temperature drops to 115°C, add 15g of 30% urotropine aqueous solution, and mix sand for 50s; then add 1.5g of calcium stearate, mix Sand for 60s; th...

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Abstract

The invention discloses coated sand for laser 3D printing and a preparation method thereof. The preparation method comprises the steps that phenolic resin with the mass being 2-3% of the mass of original sand is added into original sand as a binder, methenamine with the mass being 10-15% of the mass of the binder is added into the original sand as a curing agent, calcium stearate with the mass being 2-5% of the mass of the binder is added into the original sand as a lubricant, and gamma-aminopropyltriethoxysilane with the mass being 0.25-0.5% of the mass of the original sand is added into theoriginal sand as an additive; and a coated sand material is prepared by using a hot coating technology. The coated sand material has high strength, quick cure rate and good formability; and a workpiece laser-3D-printed through the coated sand material is clear in contour and high in forming precision, the initial billet strength of the workpiece is 0.45-0.58 MPa, the gas evolution volume is 8-10 ml / g, and theroom temperature tensile strength after curing treatment is 3.2-3.9 MPa.

Description

technical field [0001] The invention relates to a coated sand, in particular to a coated sand material used for laser 3D printing to prepare molded parts, and a preparation method of the material. [0002] technical background [0003] The traditional sand mold (core) preparation method is complicated in process, high in cost and long in cycle. Especially for sand molds (cores) for large and complex thin-walled castings, they are often composed of multiple sand molds (cores), and a slight error in their position and size will lead to low precision castings, poor surface quality, and reduced machining volume. Big. Not only wasting a large amount of metal materials, but also increasing processing costs, low work efficiency, and poor economic effect. [0004] The emergence of coated sand mold (core) laser 3D printing technology has fundamentally solved the above problems. Laser 3D printing rapid prototyping is a rapid prototyping technology that uses laser as a heat source to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/00B22C1/02B22C1/22B33Y70/00
Inventor 李玉新司晨党惊知白培康刘斌王建宏赵占勇
Owner ZHONGBEI UNIV
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