Gypsum casting method for large-sized thin-walled aluminum alloy castings

An aluminum alloy casting and gypsum molding technology, applied in the field of aluminum alloy casting, can solve problems such as the quality of large thin-walled aluminum alloy castings to be improved, achieve uniform and controllable filling temperature, prevent inhalation and secondary oxidation, and improve quality Effect

Active Publication Date: 2018-06-08
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prevent oxidation of thin-walled magnesium alloy parts, improve filling capacity, and reduce shrinkage cavity and porosity inside the casting, the quality of large thin-walled aluminum alloy castings manufactured by this method still needs to be improved

Method used

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  • Gypsum casting method for large-sized thin-walled aluminum alloy castings
  • Gypsum casting method for large-sized thin-walled aluminum alloy castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The aluminum alloy material is ZL114A aluminum alloy ingot, the casting height is required to be 1760mm, and the main body wall thickness is 3.5mm.

[0034] Casting equipment such as figure 1 As shown, wherein, the fast sealing mechanism 17 includes an oil cylinder, the oil cylinder is connected to one end of the telescopic rod, and the other end of the telescopic rod is connected to the shut-off member, and the quick sealing mechanism 17 can be activated to quickly close the riser pipe 14 and cut off the melt supply.

[0035] The concrete steps of this casting gypsum casting method are as follows.

[0036] Step 1, melting and slag removal: evenly stack the aluminum alloy ingots in the silicon carbide crucible 13 in the lower tank of the differential pressure casting machine 8, set the furnace temperature to 790°C, and heat up and melt at full speed; when the aluminum alloy ingots are completely melted, use Graphite slag scoop removes scum on the surface of the aluminu...

Embodiment 2

[0045] The aluminum alloy material is ZL101A aluminum alloy ingot, the casting height is required to be 1620mm, and the main body wall thickness is 3mm.

[0046] Casting equipment such as figure 1 shown.

[0047] The concrete steps of this casting gypsum casting method are as follows.

[0048] Step 1, melting and slag removal: evenly stack the aluminum alloy ingots in the silicon carbide crucible in the lower tank of the differential pressure casting machine, set the furnace temperature to 780°C, and heat up and melt at full speed; when the aluminum alloy ingots are completely melted, use graphite material Use the slag scoop to remove the scum on the surface of the aluminum alloy melt, and adjust the melt temperature to 735°C;

[0049] Step 2, gas-powder compound refining: when the temperature of the aluminum alloy melt reaches 735°C, use argon gas and aluminum alloy refining agent AJ01C for gas-powder compound refining treatment. The refining time is 15 minutes. After the r...

Embodiment 3

[0057] The aluminum alloy material is ZL205A aluminum alloy ingot, and the casting height is required to be 1580mm, and the main body wall thickness is 3.2mm.

[0058] Casting equipment such as figure 1 shown.

[0059] The concrete steps of this casting gypsum casting method are as follows.

[0060] Step 1, melting and slag removal: evenly stack the aluminum alloy ingots in the silicon carbide crucible in the lower tank of the differential pressure casting machine, set the furnace temperature to 800°C, and heat up and melt at full speed; when the aluminum alloy ingots are completely melted, use graphite material Use the slag scoop to remove the scum on the surface of the aluminum alloy melt, and adjust the melt temperature to 745°C;

[0061] Step 2, gas-powder compound refining: when the temperature of the aluminum alloy melt reaches 745°C, use argon and aluminum refining agent AJ203 for gas-powder compound refining treatment, the refining time is 15 minutes, after refining,...

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Abstract

The invention provides a gypsum casting method for large-sized thin-wall aluminum alloy castings. The method comprises the steps of refining treatment, melt mold filling and pressurization solidification; in the melt mold filling process, the temperature of a lower mold plate is always controlled within 650-720 DEG C, and the temperature of an upper mold plate is always controlled within 750-780 DEG C. By means of the method, through the temperature control over the mold plates, the temperature fields of a casting mold and aluminum alloy melt of the casting mold are well optimized to make thedeviation of the tensile strength of the aluminum alloy castings greatly reduced, and the quality of the aluminum alloy castings is improved.

Description

technical field [0001] The invention relates to an aluminum alloy casting method, in particular to a plaster-type casting method for a large thin-walled aluminum alloy casting. Background technique [0002] In aerospace, weapon equipment, automobiles, ships and other fields, the demand and application of aluminum alloy castings are becoming more and more extensive. At present, various aluminum alloy castings are usually produced by using gypsum as a melt filling and pressurized solidification casting process (gypsum casting process). The main equipment involved in this process includes casting tanks. The casting tanks are divided into upper tanks and lower tanks. The pattern plate at the upper end is called the upper pattern plate, and the pattern plate at the lower end is called the lower pattern plate, and the upper pattern plate, the lower pattern plate and the gypsum casting mold are all located in the upper tank; during the casting process, the aluminum alloy raw mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04B22D27/13C22C1/06C22C1/02
CPCB22D27/04B22D27/13C22C1/026C22C1/06
Inventor 黄志伟万元元陈强宁海青王茂川柴舒心李晓松赵祖德
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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