Moulding sand special for laser 3D printing and preparation process and application thereof

A 3D printing, special-purpose technology, applied in the field of material casting, can solve the problems of inconsistent parts, inability to mass produce, and inability to achieve performance indicators, and achieve the effect of small expansion coefficient, high dimensional accuracy and strength

Inactive Publication Date: 2015-06-24
ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Although 3D printing rapid prototyping technology has effectively solved the pro The limitation of rapid prototyping materials, the part after forming cannot be consistent with the material of the actual final part
(2) The performance indicators of the existing rapid prototyping manufactured parts cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Molding sand manufacturing process:

[0030] (1) Evenly mix 92kg of scrubbing Hukou sand, 3kg of bentonite and 1kg of boric acid, and bake at 200°C for 10 minutes;

[0031] (2) Place in a dry environment, after cooling to room temperature, add 1kg FFD-G03 p-toluenesulfonic acid, mix evenly, and let stand for 10s;

[0032] (3) Add 3 kg of furan resin with nitrogen content ≤ 8%, mix evenly, and let stand for 10 seconds.

[0033] Engine block sand mold making process:

[0034] (1) First put the configured molding sand into the feeding device of the laser 3D printing equipment;

[0035] (2) Turn on the laser 3D printing equipment, and after it is fully started, import the sand mold model of the engine block into the laser printing software and start the printing process;

[0036] (3) During the printing process, the laser irradiation temperature is 800°C, and the amount of molding sand laid must be strictly controlled within 0.2±0.05mm;

[0037] (4) After printing,...

Embodiment 2

[0039] Take engine block molding sand as an example

[0040] Molding sand manufacturing process:

[0041] (1) After evenly mixing 97kg of scrubbing Hukou sand, 1kg of bentonite and 0.5kg of boric acid, place it in an environment of 120°C and bake for 30 minutes;

[0042] (2) Place in a dry environment, after cooling to room temperature, add 0.5kg FFD-G03 p-toluenesulfonic acid, mix evenly, and let stand for 30s;

[0043] (3) Add 1 kg of furan resin with nitrogen content ≤ 8%, mix evenly, and let stand for 60 seconds.

[0044] Engine block sand mold making process:

[0045] (1) First put the configured molding sand into the feeding device of the laser 3D printing equipment;

[0046] (2) Turn on the laser 3D printing equipment, and after it is fully started, import the sand mold model of the engine block into the laser printing software and start the printing process;

[0047] (3) During the printing process, the laser irradiation temperature is 2500°C, and the amount o...

Embodiment 3

[0050] Molding sand manufacturing process:

[0051] (1) After evenly mixing 95kg of scrubbing Hukou sand, 1.5kg of bentonite and 0.8kg of boric acid, place it in an environment of 120~200°C and bake for 20 minutes;

[0052] (2) Place in a dry environment, after cooling to room temperature, add 0.7kg p-toluenesulfonic acid of FFD-G03 type, mix evenly, and let stand for 20s;

[0053] (3) Add 2 kg of furan resin with nitrogen content ≤ 8%, mix evenly, and let stand for 30 seconds.

[0054] Engine block sand mold making process:

[0055] (1) First put the configured molding sand into the feeding device of the laser 3D printing equipment;

[0056] (2) Turn on the laser 3D printing equipment, and after it is fully started, import the sand mold model of the engine block into the laser printing software and start the printing process;

[0057] (3) During the printing process, the laser irradiation temperature is 1500°C, and the amount of molding sand laid must be strictly contr...

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PUM

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Abstract

The invention discloses moulding sand special for laser 3D printing and a preparation process and application thereof. The moulding sand comprises forming filling matter, forming curing agents, catalytic agents and addition agents, and the forming filling matter is foundry sand, and accounts for 92.5 percent to 97 percent of the total sand weight. The forming curing agents are furan resin and account for one percent to three percent of the total sand weight. The catalytic agents are p-toluenesulfonic acid, and account for 0.5 percent to one percent of the total sand weight. The addition agents are bentonite and borax, the bentonite accounts for 1.5 percent to three percent of the total sand weight, and the boric acid accounts for zero percent to 0.5 percent of the total sand weight. The moulding sand has the advantages that in the moulding sand forming process, the moulding sand can be formed without a mould, the size precision and strength are high, and a laser 3D printing method used in moulding sand is specially suitable for new product development, sample manufacturing and complex moulding sand manufacturing.

Description

technical field [0001] The invention belongs to the field of material casting, in particular to a special molding sand for laser 3D printing and its preparation process and application. Background technique [0002] With the acceleration of the replacement of metal products in life, the requirements for the development of related metal products are getting higher and higher, and the market competition is intensifying. It is also urgent to require developers and manufacturers to effectively control the cost and quality, which puts many problems It's all down to manufacturing technology and advanced craftsmanship. Many metal core components have very complicated structures, such as automobile engine cylinder heads and cylinder block castings. During the development of engines, the manufacture of molds for these parts is one of the links with the longest production cycle and the most cost. Generally, it is necessary to change the design and process many times, and each time th...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F3/115B22C1/00
Inventor 徐临超牛丽媛林继兴李锐平陈贤航陈泽辉祝思远谢作旺周志珍
Owner ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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