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Molding sand proportioning technology for producing large supercritical casting steel

A supercritical, steel casting technology, applied in the direction of casting molds, cores, manufacturing tools, etc., can solve the health hazards of operators, unstable product quality, non-recyclable and other problems, and achieve high yield of sand molds and improved Casting process conditions, good external quality effect

Inactive Publication Date: 2013-01-09
SANXIN HEAVY IND MACHINERY
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Problems solved by technology

[0002] At present, there are very few domestic manufacturers that research, develop and produce supercritical steel castings, and mainly produce water glass sand and furan resin sand. These two kinds of sand have poor yield and large thermal expansion coefficient, resulting in a high scrap rate. Moreover, it is not recyclable, has peculiar smell, and causes great environmental pollution, which is also very harmful to the health of operators.
Due to the relatively backward domestic casting technology, the quality of the produced products is unstable, resulting in high production costs and long construction periods

Method used

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  • Molding sand proportioning technology for producing large supercritical casting steel
  • Molding sand proportioning technology for producing large supercritical casting steel

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Embodiment Construction

[0009] A molding sand proportioning process for producing large supercritical steel castings:

[0010] 1) Its back sand adopts basic phenolic resin sand, and the ratio by weight is basic phenolic resin: ratio quartz sand=(1.5~2): 100, basic phenolic resin: curing agent=100: (20~30), Quartz sand is 30 / 50 mesh or 40 / 70 mesh natural quartz sand, which contains SiO 2 ≥97% (weight). Preparation method of alkaline phenolic resin sand: put quartz sand and curing agent in the continuous resin sand mixer, add alkaline phenolic resin after mixing and grinding for 2 to 4 minutes, continue mixing and grinding for 1 to 2 minutes, unload the sand, and shape .

[0011] 2) Its surface sand adopts basic phenolic resin chrome ore sand, and the ratio by weight is basic phenolic resin: chrome ore=(1.5~2): 100, basic phenolic resin: curing agent=100: (15~25), Chromium ore is 40 / 70 mesh, which contains Cr 2 o 3 >44% (weight), refractoriness >1700°C. Alkaline phenolic resin chrome ore preparat...

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Abstract

The invention relates to a molding sand proportioning technology for producing large supercritical casting steel. The back sand in the technology adopts alkaline phenolic resin sand, and the weight ratio of alkaline phenolic resin to quartz sand is (1.5-2):100, and the weight ratio of the alkaline phenolic resin to a hardener is 100: (20-30). The face sand adopts alkaline phenolic resin chrome ores, and the weight proportion of the alkaline phenolic resin to chrome ores is (1.5-2):100, and the weight ratio of the alkaline phenolic resin to the hardener is 100: (15-25). The invention provides the sand technology for producing the large supercritical casting steel which has high proportioning and casting strength, hot deformability and good collapsibility.

Description

technical field [0001] The invention relates to a molding sand proportioning process for producing large supercritical steel castings, and belongs to the technical field of casting technology. Background technique [0002] At present, there are very few domestic manufacturers that research, develop and produce supercritical steel castings, and mainly produce water glass sand and furan resin sand. These two kinds of sand have poor yield and large thermal expansion coefficient, resulting in a high scrap rate. Moreover, it is not recyclable, has peculiar smell, causes great environmental pollution, and also has great harm to the health of operators. Due to the relatively backward domestic casting technology, the quality of the products produced is unstable, resulting in high production costs and long construction periods. Contents of the invention [0003] The purpose of the present invention is to overcome the defects in the prior art, and provide a process for producing mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/22
Inventor 王纯宏
Owner SANXIN HEAVY IND MACHINERY
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