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Casting method of ZL101 thin-wall aluminium alloy part

An aluminum alloy and thin-walled technology, which is applied in the field of aluminum alloy casting, can solve the problems of poor air permeability of sand molds, rough surface of aluminum sand parts, and increased cost of castings, so as to save raw material costs, improve surface quality, and reduce gas content. Effect

Active Publication Date: 2014-09-03
DAYE HONGTAI ALUMINUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The original sand and binder type in the molding sand have an important impact on the performance of the casting, especially for aluminum alloy casting. The sand particle size in the traditional aluminum alloy casting sand formula is too large or too small, and the material diameter of the molding sand Too large, although the air permeability is good, but the surface of the aluminum sand parts is rough, the finish is not good, the diameter of the sand material is too small, resulting in poor air permeability of the sand mold, and the aluminum castings have pores
Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, coal powder additives, etc. and water. It has a certain anti-sticking sand effect, low material cost, and high production efficiency. However, its consumption is large, the emission is serious, and the coal powder is burned and decomposed in the casting process to produce toxic gas pollution.
In addition, the traditional sand casting aluminum alloy products have a defect rate of more than 15% such as sand sticking, pores, and cracks, and the high rejection rate leads to a great increase in the cost of castings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A casting method of a ZL101 thin-walled aluminum alloy, the method comprising the steps of:

[0032] 1) Preparation of molding sand raw materials: The casting molding sand used has the following raw materials in parts by weight: 60 parts of new quartz raw sand, 28 parts of old quartz raw sand, 3 parts of electrolytic aluminum slag powder, 6 parts of zircon sand, hollow 1 part of microbeads, 18 parts of binder slurry, and 22 parts of water; among them, the particle size of the new quartz raw sand is 100-200 mesh, the particle size of the old quartz raw sand is 150-250 mesh, and the electrolytic aluminum slag powder and The particle size of the zircon sand is -300 mesh, the particle size of the hollow microsphere is about 10-60 μm, and the binder is composed of the following components in weight percentage: 36% starch, 8% furan resin, 14% calcium-based bentonite,- 100 mesh bagasse cellulose powder 5%, zinc stearate 1%, sodium tripolyphosphate 3%, and the balance is water;...

Embodiment 2

[0040] A casting method of a ZL101 thin-walled aluminum alloy, the method comprising the steps of:

[0041] 1) Preparation of molding sand raw materials: The casting molding sand used has the following raw materials in parts by weight: 64 parts of new quartz raw sand, 24 parts of old quartz raw sand, 5 parts of electrolytic aluminum slag powder, 4 parts of zircon sand, hollow 6 parts of microbeads, 16 parts of binder slurry, and 26 parts of water; among them, the particle size of the new quartz raw sand is 100-200 mesh, the particle size of the old quartz raw sand is 150-250 mesh, and the electrolytic aluminum slag powder and The particle size of the zircon sand is -300 mesh, the particle size of the hollow microsphere is about 10-60 μm, and the binder is composed of the following components in weight percentage: 40% starch, 6% furan resin, 16% calcium-based bentonite, - 100 mesh bagasse cellulose powder 3%, zinc stearate 2%, sodium tripolyphosphate 2%, and the balance is wate...

Embodiment 3

[0049] A casting method of a ZL101 thin-walled aluminum alloy, the method comprising the steps of:

[0050] 1) Preparation of molding sand raw materials: The casting molding sand used has the following raw materials in parts by weight: 62 parts of new quartz raw sand, 26 parts of old quartz raw sand, 4 parts of electrolytic aluminum slag powder, 5 parts of zircon sand, hollow 3 parts of microbeads, 17 parts of binder slurry, and 24 parts of water; among them, the particle size of the new quartz raw sand is 100-200 mesh, the particle size of the old quartz raw sand is 150-250 mesh, and the electrolytic aluminum slag powder and The particle size of the zircon sand is -300 mesh, the particle size of the hollow microsphere is about 10-60 μ m, and the binder is composed of the following components in weight percentage: 38% starch, 4% furan resin, 15% calcium-based bentonite, - 100 mesh bagasse cellulose powder 4%, zinc stearate 1.5%, sodium tripolyphosphate 2.3%, and the balance is...

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Abstract

The invention discloses a casting method of a ZL101 thin-wall aluminium alloy part. The method includes steps of: 1) preparing moulding sand raw materials; 2) preparing binder slurry, wherein the binder slurry comprises 36-40% by weight of starch, 6-8% by weight of furan resin, 14-16% by weight of calcium bentonite, 3-5% by weight of bagasse cellulose powder having a size of -100 meshes, 1-2% by weight of zinc stearate and 2-3% by weight of sodium tripolyphosphate, with the balance being water; 3) preparing moulding sand; 4) manufacturing a casting and gating system; 5) smelting a ZL101 alloy, wherein 0.035% of Sr is added for modification, argon is fed after slag removal, gas removal is performed by rotation, smelting is performed when the temperature is 735-745 DEG C, and the alloy is allowed to stand for 10-12 min after smelting; 6) casting, wherein the aluminum alloy casting temperature is controlled to e 720-730 DEG C, and the casting speed is controlled in a manner that the former two fifth of the total casting amount adopts a speed of 6-8 kg / s, the middle two fifth adopts a speed of 4-5 kg / s, and the last one fifth adopts a speed of 6-8 kg / s; and 7) cooling with the mould, opening the mould, cleaning and performing thermal processing.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a casting method of a thin-walled aluminum alloy casting. Background technique [0002] At present, more and more thin-walled aluminum alloy parts are formed by one-time casting, such as large seat, volute, and hatch castings. These castings are large in size, thin in wall, and have many unprocessed surfaces. The wall thickness is 40- 100mm, the wall thickness is 3-5mm, the wall thickness transition is uneven, the casting process is difficult, and the size is difficult to control. This type of casting usually adopts ZL101 alloy sand gravity casting or metallic die casting. Although ZL101 alloy has good fluidity, but The cooling speed of liquid metal in thin-walled, narrow and long channels is fast, and casting defects such as cold shuts are prone to occur. In the prior art, methods such as runner design, cold iron arrangement, and riser design are usually used to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/16B22C1/00B22C9/02B22C9/08C22C1/06C22C1/03C22C21/04
Inventor 朱小英
Owner DAYE HONGTAI ALUMINUM IND CO LTD
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