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Paint for improving inner runner flaky graphite layer of austenitic nodular iron casting and method

A technology of flake graphite and iron castings, which is applied in the direction of coating, casting mold, casting mold composition, etc., can solve the problems of insufficient suspension stability and adhesion of coatings, high probability of defective products, etc., and achieve excellent thixotropy and Fluidity, prevention of casting surface defects, and quality improvement effects

Active Publication Date: 2016-02-10
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can adapt to the complex structure of castings to eliminate flake graphite, but the suspension stability and cohesiveness of the coating are slightly insufficient, and the probability of defective products is slightly higher in the actual production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a coating for improving the flake graphite layer of the flow channel in the austenitic ductile iron casting. The components and the weight percentages of the components are as follows: zircon powder: 51%; sodium bentonite 3.5%; preservative 2 %; defoamer 1%; sodium alginate 0.5%; α-starch 1%; water glass binder 1%; the rest is water.

[0026] The preservative is Nordes C15 bactericidal preservative.

[0027] The defoaming agent is a defoaming agent for water-based adhesives.

[0028] The particle size of the sodium bentonite is 350 meshes.

[0029] The method for improving the flake graphite layer in the inner flow channel of the austenitic ductile iron casting comprises the following steps:

[0030] 1) Prepare the paint according to the paint components and the weight percentage of each component, and stir them evenly;

[0031] 2) Slowly dip the prepared resin sand core into the prepared coating solution, take it out after complete dip coati...

Embodiment 2

[0039] This embodiment provides a coating for improving the flake graphite layer in the flow channel of an austenitic ductile iron casting. The components and the weight percentages of the components are as follows: zircon powder: 52%; sodium bentonite 3.8%; preservative 2.3% %; defoamer 1.2%; sodium alginate 0.8%; α-starch 1.2%; water glass binder 1.2%; the rest is water.

[0040] The preservative is Nordes C15 bactericidal preservative.

[0041] The defoaming agent is a defoaming agent for water-based adhesives.

[0042] The particle size of the sodium bentonite is 350 meshes.

[0043] The method for improving the flake graphite layer in the inner flow channel of the austenitic ductile iron casting comprises the following steps:

[0044] 1) Prepare the paint according to the paint components and the weight percentage of each component, and stir them evenly;

[0045] 2) Slowly dip the prepared resin sand core into the prepared coating solution, take it out after complete d...

Embodiment 3

[0053] This embodiment provides a coating for improving the flake graphite layer in the flow channel of an austenitic ductile iron casting. The components and the weight percentages of the components are as follows: zircon powder: 53%; sodium bentonite 3.8%; preservative 2.5% %; defoamer 1.2%; sodium alginate 0.8%; α-starch 1.2%; water glass binder 1.2%; the rest is water.

[0054] The preservative is Nordes C15 bactericidal preservative.

[0055] The defoaming agent is a defoaming agent for water-based adhesives.

[0056] The particle size of the sodium bentonite is 350 meshes.

[0057] The method for improving the flake graphite layer in the inner flow channel of the austenitic ductile iron casting comprises the following steps:

[0058] 1) Prepare the paint according to the paint components and the weight percentage of each component, and stir them evenly;

[0059] 2) Slowly dip the prepared resin sand core into the prepared coating solution, take it out after complete d...

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Abstract

The invention discloses paint for improving an inner runner flaky graphite layer of an austenitic nodular iron casting. The paint comprises the following components in percentage by weight: 50-60% of zircon powder, 3-5% of sodium bentonite, 2-3% of preservative, 1-2% of defoaming agent, 0.5-2% of sodium alginate, 1-2% of alpha-starch, 1-2% of water glass binder, and 30-40% of water. The invention further provides a method for improving the inner runner flaky graphite layer of the austenitic nodular iron casting; and a sand core is dipped in the paint, and is taken out for drying and pouring. The paint and the method can prevent reducing gas in the volatilizing place in a resin from oxidizing nodular elements in molten iron, guarantee the molten iron to be effectively nodulized, and have a shielding, absorbing or replacing effect on sulfur, so that the sulfur cannot be dispersed to enter the molten iron, flaky graphite is prevented on the surface of the casting, and the surface quality of the austenitic nodular iron casting is greatly improved.

Description

technical field [0001] The invention relates to the technical field of casting auxiliary materials, in particular to a coating and a method for improving a flake graphite layer of a flow channel in an austenitic ductile iron casting. Background technique [0002] In the production process of austenitic ductile iron, the spheroidization level of the inner surface of the inner cavity and the middle section area of ​​the casting is relatively large, the middle section is 2-3, and the inner cavity surface is 5-6, which will cause the product to be scrapped and cause problems to the enterprise. cause greater losses. By analyzing the metallographic structure of the casting, it is found that the flaky graphite of the casting generally appears on the upper surface and the lower surface of the casting. It is worm-like graphite, and the depth of the lamella is generally 1 to 2 mm. Such flake graphite defects will appear on the surface of the inner flow channel of the austenitic duct...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 刘松奇闫国福孙稳定齐小军
Owner 西峡飞龙特种铸造有限公司
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