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Preparation method of frozen mold core

A technology of cores and preparation steps, applied in cores, casting molding equipment, casting molds, etc., can solve the problems of large consumption of refrigerants such as liquid nitrogen, high cost, difficult to promote, etc., and achieves low temperature, good casting structure and Performance, effect of strong chilling effect

Inactive Publication Date: 2021-06-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The other is to blow liquid nitrogen and other refrigerants into the core sand filled in the sand box or core box to freeze the core. The consumption of liquid nitrogen and other refrigerants is large, the cost is high, and it is difficult to popularize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Shape the core as follows:

[0022] A. Preparation of low-temperature core sand: mix 100% silica sand and 3% water, mix evenly, freeze to -5°C, and then disperse it to obtain granular low-temperature core sand.

[0023] B. Preparation of frozen core: Fill the granular low-temperature core sand into the molding sand box or core box, and obtain the core to be hardened after compaction. The core is sealed and vacuumed to -80KPa, and then blown into the 30°C gas, and repeat the vacuum-blowing process 3 times, so that part or all of the ice on the surface of the sand turns into water, and then when the water on the surface of the sand turns into ice and the strength of the core is high enough, demoulding or Open the core box to obtain frozen cores.

[0024] C. Box casting: After the frozen cores are boxed or assembled, the molten metal is poured. After the molten metal condenses into castings, the box is opened and the castings and core sand are separated.

[0025] D. Recy...

Embodiment 2

[0028] Shape the core as follows:

[0029] A. Preparation of low-temperature core sand: mix 2% of quartz sand, 98% of recycled quartz sand, 5% of water, 3% of bentonite, and 1% of dextrin, mix well and freeze to -20°C, and then disperse it. Granular low-temperature core sand is obtained.

[0030] B. Preparation of frozen core: fill the granular low-temperature core sand into the molding sand box or core box, and obtain the core to be hardened after compaction, seal the core and evacuate it to -85KPa, and then blow it into 20°C gas, and repeat the vacuum-blowing process twice, so that part or all of the ice on the surface of the sand turns into water, and then when the water on the surface of the sand turns into ice and the strength of the core is high enough, demoulding or Open the core box to obtain frozen cores.

[0031] C. Box casting: After the frozen cores are boxed or assembled, the molten metal is poured. After the molten metal condenses into castings, the box is open...

Embodiment 3

[0035] Shape the core as follows:

[0036] A. Preparation of low-temperature core sand: 3% graphite sand, 97% recycled graphite sand, freeze to -25°C, add sand into the sand mixer, turn on the sand mixer to keep the sand in motion, blow into the gas containing water mist, The water content in the core sand is controlled at 1% to 15%, and the granular low-temperature core sand is obtained after uniform mixing.

[0037] B. Preparation of frozen core: Fill the granular low-temperature core sand into the molding sand box or core box, seal the core and evacuate it to -50KPa, then blow in 50°C gas, and repeat the vacuuming- Blow air 50 times to turn part or all of the ice on the surface of the sand into water, and then let the water on the surface of the sand turn into ice and the strength of the core is high enough to remove the mold or open the core box to obtain a frozen core.

[0038] C. Box casting: After the frozen cores are boxed or assembled, the molten metal is poured. Aft...

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Abstract

The invention discloses a novel method for preparing a frozen mold core. The method is characterized by using base sand, water and an additive as materials, and using ice formed by freezing the water for bonding sand grains, thereby obtaining the mold core with enough strength and other properties. The method is a green and environment-friendly molding and core-making method.

Description

technical field [0001] The invention relates to the technical field of casting, and relates to a method for preparing a mold core for frozen casting. Background technique [0002] Frozen casting is a green and environmentally friendly casting method. The frozen core used in it uses ice frozen from water as the main binder. In addition to the series of advantages of ordinary sand casting, such as economical efficiency and easy access to castings with complex shapes, freeze casting also has significant advantages such as green environmental protection and less consumption of molding core materials. It is one of the preferred ways to practice green development in the foundry industry. [0003] There are two common preparation methods for cores for frozen casting. The first method is to conduct frozen cores through a cold mold (core box). The freezing time is long, the production rhythm is busy, and it is difficult to industrialize. The other is to blow liquid nitrogen and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10B22C1/16B22C1/18B22C5/08
CPCB22C9/10B22C1/167B22C1/18B22C5/08
Inventor 谢卫东魏国兵陈浩孙黎杨艳美柯珦楠柏星宇
Owner CHONGQING UNIV
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