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
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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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