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A kind of molding sand mixing method for sand mold 3D printing

A 3D printing and molding sand technology, which is used in the cleaning/processing machinery of casting materials, casting molding equipment, metal processing equipment, etc. The problem of high viscosity can save costs, expand the selection range, and overcome the effect of high alkalinity.

Active Publication Date: 2017-06-13
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the waste of old sand in 3D printing molding sand and the high viscosity of high-alkaline new sand in the prior art, and provides a molding sand mixing method for 3D printing of sand molds, so as to recover the viscosity of old sand and new sand in 3D printing high problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] First add 50 parts by weight of new sand to the sand mixer, the weight content of the basic oxide in the new sand is 4%, then add 0.4% catalyst by weight of new sand, stir for 50 seconds, and finally add 50 parts by weight of old sand , stir for 70 seconds.

[0014] The sand mold mixed in this embodiment for 3D printing has a compressive strength of 5.0 MPa and a tensile strength of 1.2 MPa after hardening.

Embodiment 2

[0016] First add 70 parts by weight of new sand to the sand mixer, the weight content of the basic oxide in the new sand is 3%, then add 0.35% of the catalyst by weight of new sand, stir for 60 seconds, and finally add 30 parts by weight of old sand , and stir for 60 seconds.

[0017] The sand mold mixed in this embodiment for 3D printing has a compressive strength of 5.5 MPa and a tensile strength of 1.3 MPa after hardening.

Embodiment 3

[0019] First add 90 parts by weight of new sand to the sand mixer, the weight content of the basic oxide in the new sand is 2.5%, then add 0.3% of the catalyst by weight of new sand, stir for 70 seconds, and finally add 10 parts by weight of old sand , stir for 50 seconds.

[0020] The sand mold mixed in this embodiment for 3D printing has a compressive strength of 6 MPa and a tensile strength of 1.4 MPa after hardening.

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PUM

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Abstract

The invention relates to the technical field of 3D printing of molding sand for casing and provides a molding sand mixing method for sand mould 3D printing. Molding sand comprises used sand recycled after sand paving and before binding agent spraying in the 3D printing process, fresh sand and a catalyst, wherein the granular components of the fresh sand are the same as those of the used and, 100 parts of the fresh sand and the used sand comprise 10-50 parts of the used sand and the balance of the fresh sand and the effective constituent of the catalyst accounts for 0.2-0.4% of weight of the fresh sand; the granularity of both the used sand and the fresh sand is 50-200 meshes and each grain comprises 1-4% of basic oxide and the balance of SiO2, and the effective constituent of the catalyst is a benzenesulfonic acid solution. By adopting the method, waste used sand in the 3D printing process can be effectively recycled, the problems of high viscosity of the fresh sand is solved and the strength of a finished product sand mould is improved.

Description

technical field [0001] The present invention relates to the technical field of 3D printing molding sand for casting, and particularly relates to a molding sand mixing method for 3D printing of sand molds. Background technique [0002] 3D printing technology is a rapid prototyping technology, which mainly uses the bonding technology of micro-droplet injection liquid and powder or particles to realize molding. The 3D printing process is to first add the powder or granular material to the catalyst and mix it evenly, and then selectively spray the binder in the shape of the sand mold on the pre-laid layer of powder or granular material through the nozzle, so that layers are superimposed , curing bond molding. Among them, the role of the catalyst is to ensure that the sand before spraying the binder has a certain viscosity, prevent the sand material from collapsing, and ensure that the molding sand after the binder is sprayed has good cohesiveness, and at the same time synthesiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C5/04B33Y40/00
CPCB22C5/0409
Inventor 毛春生孟庆文李栋杨立平刘轶
Owner KOCEL EQUIP
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