Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof

A technology of lost foam casting and steel casting, which is applied to casting molding equipment, molds, mold components, etc. It can solve problems such as carburization, pores, and slag inclusions, and achieve high refractoriness, good air permeability, and high strength. Effect

Inactive Publication Date: 2012-04-11
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing lost foam negative pressure casting method has casting defects such as carburization, pores, and slag inclusions on the surface of the casting when producing low-carbon steel and low-carbon alloy steel, which are difficult to solve, which limits the efficiency of lost foam negative pressure casting. Application of method in the production of low carbon steel and low carbon alloy steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: surface layer refractory coating makes one

[0020] Prefabricated additive paste: mix 1.5 parts of sodium tripolyphosphate and 20 parts of hot water (≥80°C) in a mixing tank, dissolve into a transparent state, add 4 parts of polyvinyl formal solution, ethoxylate 0.3 parts of sodium alkyl sulfate, stir evenly; then add 6 parts of calcium rectorite powder, after stirring, pour into a colloid mill and grind for 10 minutes to form a uniform paste, put it into a mixing bucket;

[0021] 85 parts of high chromium corundum powder, 15 parts of calcined kaolin, and 20 parts of water are poured into a mixing tank with a prefabricated additive paste and stirred evenly, then poured into a colloid mill and ground for 10 minutes, put into the mixing tank, and then add water for 20 0.6 parts of polyether-modified polydimethylsiloxane, stirred for 30 minutes to form a uniform slurry, added 0 to 5 parts of water, and adjusted the density of the slurry to 1.50 to 1.70 g / cm ...

Embodiment 2

[0022] Embodiment 2: surface layer refractory coating makes two

[0023] Prefabricated additive paste: mix 2 parts of sodium tripolyphosphate and 25 parts of hot water (≥80°C) in a mixing tank, dissolve into a transparent state, add 3 parts of polyvinyl formal solution, ethoxylate 0.5 part of sodium alkyl sulfate, stir evenly; then add 8 parts of calcium rectorite powder, after stirring, pour it into a colloid mill and grind for 12 minutes to form a uniform paste, put it into the mixing bucket.

[0024] 80 parts of high chromium corundum powder, 20 parts of calcined kaolin, and 25 parts of water are poured into a mixing bucket with a prefabricated auxiliary paste and stirred evenly, then poured into a colloid mill and ground for 15 minutes, put into the mixing bucket, and then add water for 20 0.8 parts of polyether-modified polydimethylsiloxane, stirred for 32 minutes to form a uniform slurry, added 0-5 parts of water, and adjusted the density of the slurry to 1.50-1.70g / cm ...

Embodiment 3

[0025] Embodiment 3: Surface layer refractory coating makes three

[0026] Prefabricated additive paste: mix 2.5 parts of sodium tripolyphosphate and 30 parts of hot water (≥80°C) in a mixing tank, dissolve into a transparent state, add 3 parts of polyvinyl formal solution, ethoxylate 0.5 part of sodium alkyl sulfate, stir evenly; then add 7 parts of calcium rectorite powder, after stirring, pour it into a colloid mill and grind for 15 minutes to form a uniform paste, put it into the mixing bucket.

[0027] 90 parts of high chromium corundum powder, 10 parts of calcined kaolin, and 20 parts of water are poured into a mixing tank with a prefabricated additive paste and stirred evenly, then poured into a colloid mill and ground for 12 minutes, put into the mixing tank, and then add water for 15 0.7 parts of polyether-modified polydimethylsiloxane, stirred for 35 minutes to form a uniform slurry, added 0-5 parts of water, and adjusted the density of the slurry to 1.50-1.70g / cm 3...

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PUM

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Abstract

The invention relates to an expendable pattern casting (EPC) molding shell paint for casting steel, and the EPC molding shell paint comprises surface a layer fireproof paint and a back layer reinforcing paint, wherein the surface layer fireproof paint comprises the following components in parts by weight: 80-90 parts of high-chromium alundum powder, 10-20 parts of calcined kaolinite, 6-8 parts ofcalcium rectorite powder, 1-3 parts of sodium tripolyphosphate, 3-5 parts of polyvinyl formal solution, 0.3-0.5 part of ethoxylated alkyl sodium sulfate, 0.6-1.0 part of polyether type modified polydimethylsiloxane and 60-75 parts of water; and the back layer reinforcing paint comprises the following components in parts by weight: 75-85 parts of coal gangue sand, 15-25 parts of kaolinite, 3-6 parts of feldspar powder, 8-13 parts of calcium rectorite powder, 8-10 parts of sodium tripolyphosphate, 1.5-2.0 parts of wood fiber and 30-45 parts of water. A molding shell manufactured by the surface layer fireproof paint and the back layer reinforcing paint has the characteristics of high strength and refractoriness, good air permeability and the like.

Description

technical field [0001] The invention relates to the technical fields of metal material processing and metallurgy, in particular to a lost foam casting shell coating for steel casting and a preparation method thereof. Background technique [0002] The lost foam negative pressure casting method is to bond the plastic foam model with the same size and shape as the casting and the riser system made of the same material to form a model cluster, brush the lost foam paint and dry it, and bury it in a special sand box. Vibrating and compacting the mold in dry sand, using vacuum equipment to connect a special sandbox to evacuate, and pouring high-temperature molten metal under the condition of maintaining a certain negative pressure in the mold to melt and gasify the mold, and the decomposition products escape through the mold interface. A casting method in which liquid metal occupies the position of the model, solidifies and cools to form a casting. Lost foam casting has outstandin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
Inventor 黄晋张友寿夏露李四年
Owner HUBEI UNIV OF TECH
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