Efficient core manufacturing method for blowing and hardening sodium silicate-bonded sand

A technology of water glass sand and air hardening, which is applied in the direction of cores, manufacturing tools, casting molding equipment, etc., which can solve the problems of low production efficiency, long blowing time, and inability to meet high-efficiency core making, so as to achieve less and less air hole defects. Blowing time, beneficial to the effect of environmental protection

Pending Publication Date: 2019-03-05
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blowing time is long and the production efficiency is low, which cannot meet the requirements of efficient core making

Method used

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  • Efficient core manufacturing method for blowing and hardening sodium silicate-bonded sand
  • Efficient core manufacturing method for blowing and hardening sodium silicate-bonded sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Adopt Suzhou Mingzhi Technology Co., Ltd. MLWA1 sample mechanism movement. Turn on the mold electric heating system, and control the heating temperature at 40±5°C. Then configure the core sand mixture and mix it with a laboratory blade sand mixer, put the core sand mixture into the sand shooting cylinder, and inject the core sand mixture into the standard "8" type sample at 0.4Mpa with compressed air Experimental mold cavity, the core box mold descends with the main cylinder, pushes the blowing plate to the top of the mold, the main cylinder rises, and presses the blowing plate tightly; start the blowing valve, and at 0.15Mpa, the CO 2 The gas is blown into the cavity of the sand core through the blowing plate, and the air is blown for 12s; 2 The gas pipeline connects the compressed air to the blowing plate of the mold, blows the compressed air into the cavity of the sand core under the pressure of 0.2Mpa, and blows the compressed air for 20s. Only one sand core, thre...

Embodiment 2

[0031]Adopt Suzhou Mingzhi Technology Co., Ltd. MLWA1 sample mechanism movement. Turn on the mold electric heating system, and control the heating temperature at 50±5°C.

[0032] Proportion of core-making mixture: Dalin washed sand 1000g, ZS-2.5 modulus 2.2, casting water glass 22g, silica fume 2.5g, mix with a laboratory blade sand mixer, put the core-making sand mixture into the sand shooting cylinder , at 0.5Mpa, use compressed air to inject the core-making sand mixture into the cavity of the standard "8" sample experimental mold, the core box mold will descend with the main cylinder, push the air blowing plate to the top of the mold, the main cylinder will rise, and Press the blowing plate tightly; start the blowing valve, under 0.1Mpa, the CO 2 The gas is blown into the cavity of the sand core through the blowing plate, and the blowing time is 4s; 2 The gas pipeline connects the compressed air to the blowing plate of the mold, blows the compressed air into the cavity of...

Embodiment 3

[0034] Adopt Suzhou Mingzhi Technology Co., Ltd. MLWA1 sample mechanism movement. Turn on the mold electric heating system, and control the heating temperature at 55±5°C.

[0035] Proportion of core-making mixture: Dalin scrubbing sand 1000g, casting water glass HYT S-106 for ester curing: 20g, silica fume 2g, mix with a laboratory blade sand mixer, put the core-making sand mixture into the sand shooting cylinder, At 0.5Mpa, use compressed air to inject the core-making sand mixture into the cavity of the standard "8" sample experimental mold. The core box mold descends with the main cylinder, pushes the air blowing plate to the top of the mold, and the main cylinder rises to blow the air. The air plate is pressed tightly; the blow valve is activated, and the CO 2 The gas is blown into the cavity of the sand core through the blowing plate, blowing for 3 seconds, after the blowing is completed, immediately start the ventilation valve and close the CO 2 The gas pipeline connect...

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Abstract

The invention relates to the technical field of casting, in particular to an efficient core manufacturing method for blowing and hardening sodium silicate-bonded sand. Before core manufacturing, a dieis heated to 30-100 DEG C firstly, then roughing sand, sodium silicate-bonded sand for casting and a reinforcing agent are mixed through a sand mixing machine, a core sand mixture is manufactured, then the core sand mixture is injected into the die through a core injection machine, CO2 is blown firstly, then the gas is compressed, the gas is blown into a cavity of the die, blowing and hardening are carried out, CO2 blowing pressure is 0.05-0.6 Mpa, time for blowing is 2S-120S, blowing compressed gas pressure is 0.05-0.7 Mpa, blowing time is 5S-120S, lower limit is adopted for blowing time ofsmall cores, blowing time is prolonged properly for large cores, and die is opened after blowing is finished. According to the method, the addition amount of the sodium silicate-bonded sand is small,die opening strength is high, blowing time is short, the core manufacturing speed is high, toxicity and odor are avoided, the gas generation amount of sand cores is small, the quality of castings is improved beneficially, and the labor condition is improved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a high-efficiency core-making method in which glass sand is blown and hardened with water for casting. Background technique [0002] At present, resin sand core making technology is widely used in foundry production. High-efficiency core making mainly includes: cold box resin sand core making, hot core box resin sand core making and resin coated sand core making. Cold box resin sand core needs to be hardened by blowing with amine gas. Amine gas is poisonous and has a pungent smell. It is a flammable and explosive dangerous product. It has certain risks in production, transportation, storage and use; Core box resin sand core making and resin coated sand core making, the mold needs to be heated to 180-300 ℃, high energy consumption, strong smell, and harsh working environment. The above-mentioned core-making technologies all need to use artificial synthetic organic resin as a bind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10
CPCB22C9/10
Inventor 金广明尹德英魏甲殷行孔艺博
Owner SHENYANG HYATON FOUNDRY MATERIAL
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