Preparation method of 3D printing sand mold capable of synchronously reinforcing and toughening interior and surface

A technology of strengthening and toughening, 3D printing, applied in the field of 3D printing sand molds, can solve the problems of restricting the application of 3D printing sand molds, the strength increase is not large, and the porosity of 3D printing sand molds is reduced. Effects of the opposite sex, easy to apply

Pending Publication Date: 2022-04-22
爱司达智能制造(江苏)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the document "Sivarupan T, El Mansori M, Coniglio N, Dargusch M, Effect of process parameters on flexure strength and gas permeability of 3D printed sand molds, JOURNAL OF MANUFACTURING PROCESSES, 2020, 54: 420-437." resolution, etc. to optimize the strength of the sand mold and suppress anisotropy. Although this method reduces the porosity of the 3D printed sand mold to a certain extent, and suppresses the anisotropy of the 3D printed sand mold to a certain extent, the porosity and various The problem of anisotropy still exists, and the increase in strength is not large, which still restricts the application of 3D printing sand molds

Method used

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  • Preparation method of 3D printing sand mold capable of synchronously reinforcing and toughening interior and surface
  • Preparation method of 3D printing sand mold capable of synchronously reinforcing and toughening interior and surface
  • Preparation method of 3D printing sand mold capable of synchronously reinforcing and toughening interior and surface

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preparation example Construction

[0022] The present invention provides a kind of preparation method (abbreviation method) of the 3D printing sand mold of internal and surface synchronous strengthening and toughening, it is characterized in that, this method comprises the following steps:

[0023] Step 1. According to the strength and toughness requirements of the final product, mix the raw sand with a certain particle size and the reinforced and toughened polymer powder in the sand mixing tank; then, under the precise metering of the metering pump, pump the curing agent A Put it into the sand mixing tank, and stir to make the curing agent A evenly dispersed in the raw sand and the reinforcing and toughening polymer powder to obtain the raw sand system;

[0024] Preferably, in step 1, the mixing speed of raw sand and reinforced toughening polymer powder is 300-600r / min, and the time is 1-60min; the stirring speed of dispersing curing agent A is 100-400r / min, and the time is 1 ~10min; Curing agent A is added in...

Embodiment 1

[0039] Step 1. Stir and mix the raw sand of 70-200 mesh and ethylene-vinyl acetate copolymer powder of 70-200 mesh in the sand mixing tank; then pump the strong acid aqueous solution into the sand mixing tank under the precise metering of the metering pump. Under stirring, the strong acid aqueous solution is evenly dispersed in the raw sand and the reinforcing and toughening polymer powder to obtain the raw sand system; the quality of the strong acid aqueous solution is 0.6% of the quality of the raw sand, and the quality of the ethylene-vinyl acetate copolymer is 20% of the quality of the raw sand. %;

[0040] Step 2. Distribute the original sand system to the sanding module of the 3D printer, and introduce the furan resin into the nozzle of the 3D printer; during the layer-by-layer sand-dressing process of the sand-dressing module of the 3D printer, the nozzle of the 3D printer sprays the furan resin layer by layer according to the cross-sectional shape of the part , under t...

Embodiment 2

[0057] Step 1. In the sand mixing tank, mix the raw sand of 70-200 mesh and the ethylene-acrylic acid copolymer powder of 70-200 mesh evenly; then, under the precise metering of the metering pump, pump the strong acid aqueous solution into the sand mixing tank. The strong acid aqueous solution is evenly dispersed in the raw sand and the reinforcing and toughening polymer powder to obtain the raw sand system; the quality of the strong acid aqueous solution is 0.6% of the weight of the raw sand, and the quality of the ethylene-acrylic acid copolymer is 20% of the weight of the raw sand;

[0058] Step 2. Distribute the original sand system to the sanding module of the 3D printer, and introduce the furan resin into the nozzle of the 3D printer; during the layer-by-layer sand-dressing process of the sand-dressing module of the 3D printer, the nozzle of the 3D printer sprays the furan resin layer by layer according to the cross-sectional shape of the part , under the action of strong...

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Abstract

The invention discloses a preparation method of a 3D printing sand mold capable of synchronously reinforcing and toughening the interior and the surface, and the anisotropy of the 3D printing sand mold is effectively eliminated by adopting a sand mold interior and surface synchronous reinforcing and toughening process. According to the method, through sand mixing operation, reinforced and toughened polymer powder is uniformly introduced into a porous sand mold framework in the printing stage, in the subsequent heat treatment process, a powdery polymer is molten into a liquid state and flows, fuses and blocks pores in sand mold holes, and the problem that the porosity of a 3D printing sand mold is high is effectively solved; and meanwhile, a polymer net penetrating through the sand mold is formed through curing in the cooling process, and a reinforcing and toughening network is constructed in the sand mold. A liquid mixture is utilized to infiltrate the surface of a sand mold, and then high-temperature post-treatment is performed, so that the liquid mixture is cured into a three-dimensional cross-linked polymer net on the surface of the sand mold within a certain thickness range, a reinforcing and toughening network is constructed on the surface of the sand mold, and the problem of surface particle falling is solved.

Description

technical field [0001] The invention relates to the field of 3D printing sand molds, in particular to a method for preparing 3D printing sand molds with internal and surface synchronously reinforced and toughened. Background technique [0002] 3D printing is a kind of rapid prototyping technology, also known as additive manufacturing. It is based on digital model files and uses adhesive materials such as metals, polymers, and inorganic non-metallic materials to print layers by layers. Techniques for constructing objects. With the development of 3D printing technology and equipment, the fine sand is stacked layer by layer, and then the specially designed nozzle is used to spray the special adhesive according to the shape of the cross section of the part, so that the sand can be bonded together. Sand molds with extremely complex geometries can be prepared by selectively spraying the binder for bonding. [0003] The earliest application field of 3D printing sand molds was in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C64/165B29C64/379B29C64/393B22C9/02C09D163/00C09D7/63C09D7/65B33Y10/00B33Y40/20B33Y70/10B33Y50/02B29K103/08
CPCB29C64/165B29C64/379B29C64/393B22C9/02C09D163/00C09D7/63C09D7/65B33Y10/00B33Y40/20B33Y70/10B33Y50/02B29K2103/08C08L81/04C08K5/12Y02P10/25
Inventor 戴成杰徐乃库韩炜张常飞
Owner 爱司达智能制造(江苏)有限公司
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