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Preparation method for lost foam casting paint

A lost foam casting and coating technology, which is applied in casting molding equipment, coatings, molds, etc., can solve the problems of casting cavity collapse, low high temperature strength, paint damage, etc. The effect of good performance and low production cost

Active Publication Date: 2012-05-02
CHINA CAMC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the lost foam casting process has developed rapidly since its inception, the coating technology has been plagued by the fact that it is difficult to greatly improve the casting yield. The main reason is that the quality of the coating cannot meet the requirements of the lost foam casting process.
One is that the strength at room temperature does not meet the requirements, and the shape is deformed and the coating is damaged during molding, so that the casting is scrapped; the other is that the high-temperature strength is low, and the casting cavity collapses, damages, and paint peeling occurs during pouring, so that the casting is scrapped; the third is that the coating is not suitable. High temperature air permeability, too high air permeability will cause the cavity to collapse, and too low air permeability will cause casting defects such as pores, wrinkled skin, and slag inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing a coating for lost foam casting. The coating consists of the following components in parts by weight: 20 parts of zircon powder, 20 parts of kaolin, 10 parts of corundum powder, 3 parts of polyvinyl acetate emulsion, 1 part of aluminum sulfate, embossed 1 part of clay, 0.2 parts of disodium hydrogen phosphate, 7 parts of sodium bentonite, 0.4 parts of sodium benzoate, 0.5 parts of iron oxide, 0.05 parts of n-octanol, 1.2 parts of carboxymethyl cellulose, 0.05 parts of ethyl acetate, nonyl 0.06 part of phenol polyoxyethylene ether and 15 parts of water, wherein the particle size of the zircon powder and high-territory is 180-320 mesh, the particle size of the corundum powder is 250-350 mesh, and the preparation method comprises the following steps: Add water into the reaction kettle, turn on the reaction kettle, the stirring speed is: 100r / min, add carboxymethyl cellulose into the reaction kettle under stirring, heat, slowly raise the temperature of...

Embodiment 2

[0018] A method for preparing a coating for lost foam casting. The coating consists of the following components in parts by weight: 30 parts of zircon powder, 15 parts of kaolin, 15 parts of corundum powder, 2 parts of polyvinyl acetate emulsion, 2 parts of aluminum sulfate, embossed 0.5 parts of stick clay, 0.3 parts of disodium hydrogen phosphate, 5 parts of sodium bentonite, 0.6 parts of sodium benzoate, 0.3 parts of iron oxide, 0.1 parts of n-octanol, 0.6 parts of carboxymethyl cellulose, 0.08 parts of ethyl acetate, nonyl 0.04 part of phenol polyoxyethylene ether and 25 parts of water, wherein the particle size of the zircon powder and high-territory is 180-320 mesh, the particle size of the corundum powder is 250-350 mesh, and the preparation method comprises the following steps: Add water into the reaction kettle, turn on the reaction kettle, the stirring speed is: 100r / min, add carboxymethyl cellulose into the reaction kettle under stirring, heat, slowly raise the tempe...

Embodiment 3

[0020] A method for preparing a coating for lost foam casting. The coating consists of the following components in parts by weight: 25 parts of zircon powder, 18 parts of kaolin, 13 parts of corundum powder, 2.5 parts of polyvinyl acetate emulsion, 1.5 parts of aluminum sulfate, embossed 0.8 parts of stick clay, 0.25 parts of disodium hydrogen phosphate, 6 parts of sodium bentonite, 0.5 parts of sodium benzoate, 0.4 parts of iron oxide, 0.07 parts of n-octanol, 0.9 parts of carboxymethyl cellulose, 0.07 parts of ethyl acetate, nonyl 0.05 part of phenol polyoxyethylene ether and 20 parts of water, wherein the particle size of the zircon powder and high-territory is 180-320 mesh, the particle size of the corundum powder is 250-350 mesh, and the preparation method comprises the following steps: Add water into the reaction kettle, turn on the reaction kettle, the stirring speed is: 110r / min, add carboxymethyl cellulose into the reaction kettle under stirring, heat, slowly raise the...

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Abstract

The invention discloses a preparation method for lost foam casting paint. The involved ingredients of the paint are optimized, and the composition and respective contents of aggregates, suspension agents, bonding agents and auxiliary materials of the paint are determined, so the effects among all ingredients are matched, and the integral performance of the paint is improved. The preparation method is characterized in that all ingredients are mixed in different steps according to the ingredient characteristics of the prepared paint, and the effect of the prepared paint is realized to the maximum degree. The normal temperature intensity and the high temperature intensity of the prepared paint are high, and in addition, the high-temperature ventilation performance is good.

Description

technical field [0001] The invention relates to the field of casting, in particular to the technical field of lost foam casting. Background technique [0002] Lost foam casting is to combine 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 the dry sand of the special sand box Vibrating and compacting the molding, using vacuum equipment to connect a special sand box to evacuate, pouring high-temperature metal liquid 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 coating / mould interface, and the liquid state A casting method in which metal occupies the position of the model, solidifies and cools to form a casting. Lost foam casting has outstanding advantages such as high dimensional accuracy of castings, less pollution, and low co...

Claims

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Application Information

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IPC IPC(8): B22C3/02B22C9/04
Inventor 朱小英
Owner CHINA CAMC ENG
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