Water-based casting coating for precoated sand casting and preparation method thereof

A casting coating and coated sand technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of difficult to improve casting surface quality and poor casting surface quality, and achieve smooth casting surface, simple manufacturing process, The effect of low roughness

Inactive Publication Date: 2016-09-21
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the surface layer of the lost-wax precision casting mold shell is a coating layer formed on a smooth wax mold by 325 mesh refractory powder and binder, and the coated sand process is a mold surface formed by 70 or 140 mesh sand grains, Compared with the lost wax precision casting process, the coated sand process has poor surface quality of castings, and it is difficult to improve the surface quality of castings by using existing coatings on the market

Method used

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  • Water-based casting coating for precoated sand casting and preparation method thereof
  • Water-based casting coating for precoated sand casting and preparation method thereof
  • Water-based casting coating for precoated sand casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The weight percent of the water-based foundry coating formula composition that this implementation is used for coated sand casting is: particle size is 600 mesh pyrophyllite powder 36%, particle size is 800 mesh iron oxide 1.84%, sodium chloride 1.76%, polyvinyl alcohol 1.43% %, sodium bentonite 1.57%, penetrant JFC 0.15%, n-amyl alcohol 0.25%, water 57%. Prepare coating gross weight 1000 grams, concrete preparation steps are as follows:

[0026] (1) Weigh 360 grams of pyrophyllite powder, 18.4 grams of iron oxide powder, 17.6 grams of sodium chloride, 1.5 grams of penetrant JFC, 2.5 grams of defoamer, 15.7 grams of sodium bentonite, and 14.3 grams of polyvinyl alcohol by weight percentage and water 570 grams;

[0027] (2) 15.7 grams of sodium bentonite and 15.7 grams of water are mixed to make a paste for subsequent use;

[0028] (3) Take 128.7 grams of water and put it into a small container, then slowly add 14.3 grams of polyvinyl alcohol therein, stir while adding...

Embodiment 2

[0034] The weight percent of the water-based foundry coating formula composition that this implementation is used for coated sand casting is: particle size is 700 mesh kaolin 35%, particle size is 700 mesh iron oxide 1.71%, industrial grade sodium chloride 1.89%, cold water instant polymer Vinyl alcohol 1.66%, sodium bentonite 1.34%, penetrant JFC 0.17%, n-butanol 0.23%, water 58%. The total weight of the coating is 1000 grams, and the specific manufacturing steps are as follows:

[0035] (1) Weigh 350 grams of kaolin, 17.1 grams of iron oxide powder, 18.9 grams of industrial grade sodium chloride, 1.7 grams of penetrant JFC, 2.3 grams of n-butanol, 13.4 grams of sodium bentonite, and 16.6 grams of cold water instant polyvinyl alcohol and 580g of water;

[0036] (2) 13.4 grams of sodium bentonite and 13.4 grams of water are mixed to make a paste for subsequent use;

[0037] (3) Take 149.4 grams of water and put it into a small container, then slowly add 16.6 grams of polyvin...

Embodiment 3

[0043] The weight percent of the water-based foundry paint formula composition for coated sand casting in this implementation is: 38% of quartz powder with a particle size of 800 mesh, 1.96% of iron oxide with a particle size of 600 mesh, 1.64% of industrial grade sodium chloride, cold water instant type Polyvinyl alcohol 1.36%, sodium bentonite 1.64%, penetrant JFC 0.14%, n-octanol 0.26%, water 55%. The total weight of the coating is 1000 grams, and the specific manufacturing steps are as follows:

[0044] (1) Weigh 380 grams of kaolin, 19.6 grams of iron oxide powder, 16.4 grams of industrial grade sodium chloride, 1.4 grams of penetrant JFC, 2.6 grams of n-butanol, 16.4 grams of sodium bentonite, and 13.6 grams of cold water instant polyvinyl alcohol and 550g of water;

[0045] (2) 16.4 grams of sodium bentonite and 16.4 grams of water are mixed to make a paste for subsequent use;

[0046] (3) Take 122.4 grams of water and put it into a small container, then slowly add 13...

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Abstract

The invention provides a water-based casting coating for precoated sand casting and a preparation method thereof. The powdery casting coating provided by the invention is prepared from the following components in percentage by weight: 35 to 38 percent of refractory aggregate, 1.71 to 1.96 percent of ferric oxide, 1.64 to 1.89 percent of sodium chloride, 1.36 to 1.66 percent of polyving akohol, 1.34 to 1.64 percent of sodium bentonite, 0.14 to 0.17 percent of penetrating agent JFC, 0.23 to 0.26 percent of defoamer, and the balance water. The water-based casting coating for precoated sand casting provided by the invention can enable the surface finishment of castings casted by precoated sand to achieve the surface finishment effect of lost-wax precision castings.

Description

technical field [0001] The invention relates to the field of coated sand casting coatings, in particular to a water-based casting coating for coated sand casting and a preparation method thereof. Background technique [0002] The coated sand process belongs to a semi-precision casting molding process. Compared with the lost wax precision casting process, the coated sand process has been used by more and more foundry companies due to its short molding cycle, simple process and low production cost. . However, since the surface layer of the lost-wax precision casting mold shell is a coating layer formed on a smooth wax pattern by 325 mesh refractory powder and binder, and the coated sand process is a casting mold surface formed by 70 or 140 mesh sand grains, Compared with the lost wax precision casting process, the coated sand process has a poorer surface quality of the castings, and it is difficult to improve the surface quality of the castings by using the existing coatings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 张友寿夏露黄晋晏骏玮李四年
Owner HUBEI UNIV OF TECH
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