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Coating for metal mold casting of aluminum alloy thin-walled piece and preparation method and coating method thereof

A technology for metal mold casting and thin-walled parts, which is applied in casting molding equipment, metal processing equipment, coatings, etc. and shrinkage, reducing the amount of defects, the effect of easy formulation

Inactive Publication Date: 2011-08-10
SHANGHAI AIERSI LIGHT ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the same way, because the carrier liquid is water, water vapor will be formed in the mold cavity of aluminum alloy thin-walled castings, which will greatly increase the pinhole defects of castings and reduce the airtightness of aluminum alloy thin-walled castings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Refractory aggregate: 0.5 parts of diatomite, 0.6 parts of corundum powder, 1.5 parts of titanium dioxide, 6.4 parts of asbestos powder, binder: 1 part of silica sol or anhydrous phosphate, 50 parts of industrial alcohol.

[0017] First put the refractory aggregate and binder into a container of appropriate size, and then stir them evenly by hand or mechanically, then pour industrial alcohol into the container, stir evenly and set aside for later use. The temperature of the mold is 250°C, and the method of spraying is used for coating, and a 0.4mm thick coating is sprayed on the surface of the mold. The wall thickness of the poured aluminum alloy casting is 3.5mm, without defects such as cold shut, pinhole and shrinkage porosity.

Embodiment 2

[0019] Refractory aggregate: 1 part of diatomite, 1 part of corundum powder, 3.5 parts of titanium dioxide, 3.7 parts of asbestos powder, binder: 0.8 part of silica sol or anhydrous phosphate, 40 parts of industrial alcohol.

[0020] First put the refractory aggregate and binder into a container of appropriate size, and then stir them evenly by hand or mechanically, then pour industrial alcohol into the container, stir evenly and set aside for later use. The temperature of the mold is 300°C, and the method of spraying is used for coating, and a 0.2mm thick coating is sprayed on the surface of the mold. The wall thickness of the poured aluminum alloy casting is 4mm, without defects such as cold shut, pinhole and shrinkage porosity.

Embodiment 3

[0022] Refractory aggregate: 0.8 parts of diatomite, 0.8 parts of corundum powder, 2.5 parts of titanium dioxide, 5 parts of asbestos powder, binder: 0.9 parts of silica sol or anhydrous phosphate, 30 parts of industrial alcohol.

[0023] First put the refractory aggregate and binder into a container of appropriate size, and then stir them evenly by hand or mechanically, then pour industrial alcohol into the container, stir evenly and set aside for later use. The temperature of the mold is 350°C, and the method of spraying is used for coating, and a 0.3mm thick coating is sprayed on the surface of the mold. The wall thickness of the poured aluminum alloy casting is 4mm, without defects such as cold shut, pinhole and shrinkage porosity.

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Abstract

The invention provides a metal mold casting coating for an aluminum alloy thin-walled piece. The coating is prepared from refractory aggregate, adhesive and carrier liquid, wherein the refractory aggregate contains kieselguhr, corundum powder, titanium dioxide and asbestos powder; the adhesive is silica sol or anhydrous phosphate; the carrier liquid is industrial alcohol; and the coating comprises the following components in part by weight: 0.5 to 1 part of kieselguhr, 0.5 to 1 part of corundum powder, 1.5 to 3.5 parts of titanium dioxide, 3 to 7 parts of asbestos powder, 0.6 to 1 part of silica sol or anhydrous phosphate, and 20 to 60 parts of industrial alcohol. The invention also provides a preparation method for the coating; the method comprises the following steps of: putting the refractory aggregate and the adhesive into a container with proper size, stirring the refractory aggregate and the adhesive uniformly through manpower or a machine, pouring the industrial alcohol into the container, and stirring uniformly for later use. The invention finally relates to a coating method of the coating. When the coating is used, the temperature of a die is between 180 and 400 DEG C, and a coating with the thickness of 0.1 to 0.5 millimeter is coated on the surface of the die.

Description

technical field [0001] The invention relates to a coating for metal mold casting, in particular to a coating for metal mold casting of aluminum alloy thin-walled parts. The invention also relates to a preparation method and a coating method of the aluminum alloy thin-walled metal mold casting paint. Background technique [0002] Metal mold casting, also known as hard mold casting, is a casting method in which liquid metal is poured into metal molds to obtain castings. Cast molds are made of metal and can be used repeatedly (hundreds to thousands of times). The castings that metal mold casting can produce at present have certain restrictions in terms of weight and shape. For example, the weight of castings should not be too large; the wall thickness is also limited, and it is difficult to cast smaller castings with wall thickness. [0003] Due to the fast cooling rate of aluminum alloy thin-walled parts in the metal mold casting process, it is easy to form defects such as c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 蒋海燕王迎新花传平姚正裔王科
Owner SHANGHAI AIERSI LIGHT ALLOY
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