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Aluminum alloy EPC (Expendable Pattern Casting) coating and preparation method thereof

A technology of lost foam casting and aluminum alloy, which is applied in casting molding equipment, metal processing equipment, coating, etc. It can solve the problems of large heat loss, slow filling speed, and affecting the quality of castings, so as to save labor and improve the quality of castings , handle simple effects

Active Publication Date: 2014-06-18
苏州科博尔机床集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the process of lost foam casting aluminum alloy castings, aluminum alloy castings often have pores. Although there are many methods for coating preparation, most of them emphasize increasing the air permeability of the coating. It is hoped that the appearance can be eliminated in time after gasification. gas
However, due to the low casting temperature of aluminum alloy, which is about 750-800 degrees, the aluminum alloy liquid loses a lot of heat when filling the mold, and part of the heat is transmitted to the dry sand through the paint, resulting in poor filling ability of the aluminum alloy liquid. decline, the filling speed is slow, which greatly affects the quality of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare the aluminum alloy lost foam casting coating according to the following steps: A. Add 7 parts by weight of attapulgite to 55 parts by weight of water, and fully stir it into a slurry; B. Mix 2 parts by weight of silica sol, 1 part by weight of water glass, and carboxymethyl fiber After mixing 0.7 parts by weight of plain sodium, 0.5 parts by weight of n-octanol, and 0.5 parts by weight of fatty alcohol polyoxyethylene ether, add 10 parts by weight of water to prepare an aqueous solution; C. 45 parts by weight of diatomite, 33 parts by weight of talcum powder 20 parts by weight of water and the slurry prepared in step A were added to the aqueous solution prepared in step B, and 20 parts by weight of water was added under continuous stirring, and the coating was prepared after thorough mixing.

[0023] Wherein, the total amount of water added in each step is the proportion of water in the formula, but the amount of water added in each step can be freely adjusted ac...

Embodiment 2

[0025] Prepare the aluminum alloy lost foam casting coating according to the following steps: A. Add 4 parts by weight of attapulgite to 40 parts by weight of water, and stir at a high speed above 1000rpm for 3 hours to form a slurry; B. Mix 4 parts by weight of silica sol, 3 parts by weight of water glass After mixing parts by weight, 0.3 parts by weight of sodium carboxymethylcellulose, 0.2 parts by weight of n-octanol, and 0.2 parts by weight of fatty alcohol polyoxyethylene ether, add 10 parts by weight of water to prepare an aqueous solution; C. Diatomaceous earth 55 Parts by weight, 28 parts by weight of talcum powder, and the slurry prepared in step A were added to the aqueous solution prepared in step B, and 25 parts by weight of water was added under constant stirring, and the coating was prepared after thorough mixing.

[0026] Among them, in order to fully mix the attapulgite and water uniformly, it is preferable to stir at a high speed of 1000 rpm or more for 3 hour...

Embodiment 3

[0028] Prepare the aluminum alloy lost foam casting coating according to the following steps: A. Add 6 parts by weight of attapulgite to 55 parts by weight of water, and fully stir it into a slurry; B. Mix 2 parts by weight of silica sol, 2 parts by weight of water glass, and carboxymethyl fiber After mixing 0.6 parts by weight of plain sodium, 0.4 parts by weight of n-octanol, and 0.3 parts by weight of fatty alcohol polyoxyethylene ether, add 8 parts by weight of water to prepare an aqueous solution; C. 48 parts by weight of diatomite, 31 parts by weight of talcum powder part, and the slurry prepared in step A, added to the aqueous solution prepared in step B, added 19 parts by weight of water under constant stirring, and stirred at a high speed above 1000rpm for 1 hour, then kept the speed below 600rpm Stir at low speed for 3 hours and mix well to prepare the coating.

[0029] Among them, in order to mix the components of the coating evenly and fully discharge the gas invol...

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PUM

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Abstract

The invention relates to an aluminum alloy EPC (Expendable Pattern Casting) coating and a preparation method thereof, wherein the coating consists of the following components: diatomite, talcum powder, attapulgite, silica sol, water glass, carboxymethylcellulose sodium, n-octyl alcohol, fatty alcohol-polyoxyethylene ether and water. Through the application of the aluminum alloy EPC coating, a model is not easy to deform in the processing process, few holes exist in the surface of a casting, and the casting quality is greatly improved; and a coating layer made of the coating is easy to peel off from the surface of the casting, the post-treatment is simple, and a large amount of labor is saved.

Description

technical field [0001] The invention belongs to the field of casting, in particular to the technical field of aluminum alloy lost foam casting. Background technique [0002] Lost foam casting (also known as solid casting) is to bond and combine foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding, and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method of castings. [0003] Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable size; 3. High dimensional accuracy and smooth surface, reducing cleaning workload; 4. Internal Defects are greatly reduced and the organization is compact; 5. Large-scale and mass production can be realized, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 陈立国
Owner 苏州科博尔机床集团有限公司