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Method for three-dimensional jet-printing, forming and casting of core

A casting mold, three-dimensional technology, used in casting molding equipment, cores, molds, etc., can solve the problem of layer-by-layer drying, and achieve the effect of increasing the effective bonding area, reducing internal stress, and simplifying the process

Active Publication Date: 2015-11-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a method for three-dimensional jet printing casting cores, the purpose of which is to solve the need for gradually Layer Drying Technical Issues

Method used

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  • Method for three-dimensional jet-printing, forming and casting of core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Use the existing thermal coating process to prepare coated sand for 3DP. The coated sand has a particle size of 0.1mm to 0.2mm, including raw sand, novolac resin, calcium stearate and hexamethylenetetramine . Among them, the original sand is Baozhu sand, and the mass of phenolic resin is 2.2% of the original sand; the mass ratio of hexamethylenetetramine to phenolic resin is 8:100, and the mass ratio of calcium stearate to phenolic resin is 3:100.

[0037] (2) preparation is used to bond the bonding liquid of coated sand powder; The analytical pure dehydrated alcohol of 50g is joined in the container, then adds deionized water 49g (the mass ratio of deionized water and bonding liquid is 49: 100), polyethylene glycol 1g (mass ratio of polyethylene glycol to bonding liquid is 1:100), and made into bonding liquid.

[0038](3) Lay the coated sand into a thin layer with a thickness of 0.2 mm to 0.3 mm, and use a three-dimensional jet printing device to spray the bonding...

Embodiment 2

[0043] (1) Prepare the coated sand for 3DP by using the existing thermal coating process. The coated sand has a particle size of 0.1 mm to 0.25 mm, including raw sand, phenolic resin, calcium stearate and hexamethylenetetramine. Among them, the original sand is Baozhu sand, the content of phenolic resin is 2.4%, the curing agent urotropine is 2.2g, the mass ratio of hexamethylenetetramine to phenolic resin is 10:100, and the mass ratio of calcium stearate to phenolic resin is 10:100. The ratio is 5:100.

[0044] (2) prepare the bonding liquid that is used for bonding coated sand powder; The analytical pure dehydrated alcohol of 60g is joined in the container, then add deionized water 38.5g (the mass ratio of deionized water and bonding liquid is 38.5 :100), polyethylene glycol 1.5g (mass ratio of polyethylene glycol to bonding liquid is 1.5:100), was prepared into bonding liquid.

[0045] (3) The bonding liquid is deposited into the coated sand powder bed by 3DP forming equip...

Embodiment 3

[0049] (1) Prepare the coated sand for 3DP by using the existing thermal coating process, with a particle size of 0.1 mm to 0.25 mm, including raw sand, phenolic resin, calcium stearate and hexamethylenetetramine. Among them, the original sand is pearl sand, and the mass ratio of phenolic resin is 2.6% of the original sand; the mass ratio of hexamethylenetetramine to phenolic resin is 12:100, and the mass ratio of calcium stearate to phenolic resin is 7:100.

[0050] (2) preparation is used to bond the bonding liquid of coated sand powder; The analytical pure dehydrated alcohol of 75g is joined in the container, then adds deionized water 23g (the mass ratio of deionized water and bonding liquid is 23 : 100), polyethylene glycol 2g (mass ratio of polyethylene glycol to bonding liquid is 2: 100), prepared into bonding liquid.

[0051] (3) The bonding liquid is deposited into the coated sand powder bed by 3DP forming equipment, and the core-shaped blank is formed by layer-by-laye...

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Abstract

The invention discloses a method for three-dimensional jet-printing, forming and casting of a core. The method comprises the comprises the following steps: (1) spreading film covering sand to form a thin layer, and selectively injecting bonding liquid into the film covering sand by using a three-dimensional jet-printing device so that particles in the film covering sand can be bonded with one another to form a first layer; (2) forming a second layer by using the same method in the step (1), repeating the step (1) until a part is formed completely, and standing the part in a powder bed for a period of time so as to obtain an initially formed blank; and (3) heating the initially formed blank at the temperature of 170-220 DEG C until the bonding liquid completely volatilizes, and cross-linking and curing with phenolic resin, so that the casting of the core is finished. According to the method, the method for three-dimensional jet-printing, forming and casting of the core is simplified; the film covering sand can be accumulated layer by layer without drying conditions among layers, so that the fast casting forming of the core is finished; finally, a produced piece is relatively high in intensity, low in cost and high in efficiency; the method can be used for producing the casting core with the large size and a fine structure, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of rapid casting, and more specifically relates to a method for forming a casting core by three-dimensional jet printing. Background technique [0002] Three-dimensional printing (Three-dimensional printing, 3DP), also known as micro-droplet jetting or micro-jet bonding technology, is a method that uses the movement of the nozzle to selectively spray droplets on the surface of the powder bed. The rapid prototyping technology of selected area solidification forming, which adopts the principle of discrete and accumulation forming, with the help of computer-aided design and manufacturing, directly forms solid powder materials into three-dimensional solid parts without any tooling and molds, and is not subject to forming The effect of complexity. [0003] 3DP technology can be directly used in shape casting cores, and extensive research has been done on 3DP shape casting cores at home and abroad. The methods of forming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10C08L61/06C08K3/36
Inventor 魏青松史玉升刘洁田乐李晶朱伟
Owner HUAZHONG UNIV OF SCI & TECH
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