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Melting and pouring method of investment casting aluminum alloy

A pouring method and investment casting technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of formation of inclusions, pinholes, etc., reduce oxidation and air absorption, reduce casting scrap, and improve mechanical properties Effect

Inactive Publication Date: 2019-10-25
INSPECTION AND QUARANTINE TECHNOLOGY CENTER ZHONGSHAN ENTRY EXIT INSPECTION AND QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting temperature, the alloy liquid will be oxidized in large quantities to form oxidized slag during this process, and a large amount of gas will be absorbed, and defects such as inclusions and pinholes will be formed in the product due to oxidation and gas absorption.

Method used

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  • Melting and pouring method of investment casting aluminum alloy
  • Melting and pouring method of investment casting aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The smelting and pouring method of investment casting aluminum alloy of the present invention includes the following steps:

[0028] 1) Alloy melting

[0029] When the temperature in the furnace is 700℃, add pure aluminum, aluminum-silicon master alloy, pure copper, and pure manganese into the furnace, wherein the mass ratio of pure aluminum, aluminum-silicon master alloy, pure copper, and pure manganese is 100 :5:0.5:1, increase the heating power as much as possible in the raw material heating stage to speed up the alloy smelting speed. After the raw materials begin to dissolve, add the covering agent (the covering agent is a mixture of potassium chloride and sodium chloride, The mass ratio is 1:1), the amount of covering agent added is 2% of the mass of pure aluminum, so that the alloy liquid level is always in a protected state; after all the raw materials are melted, pure magnesium is added to it with a bell jar, and the amount of pure magnesium added is pure aluminum ma...

Embodiment 2

[0037] The smelting and pouring method of investment casting aluminum alloy of the present invention includes the following steps:

[0038] 1) Alloy melting

[0039] When the temperature in the furnace is 680℃, add pure aluminum, aluminum-silicon master alloy, pure copper, and pure manganese into the furnace, and the mass ratio of pure aluminum, aluminum-silicon master alloy, pure copper, and pure manganese is 100 :0.4:0.1:0.05, increase the heating power as much as possible during the raw material heating stage to speed up the alloy smelting speed. After the raw materials begin to dissolve, add the covering agent (the covering agent is a mixture of potassium chloride and sodium chloride, and the mixture of potassium chloride and sodium chloride The mass ratio is 1:1), the amount of covering agent added is 1% of the mass of pure aluminum, so that the alloy liquid level is always in a protected state; after all the raw materials are melted, pure magnesium is added to it with a bell ...

Embodiment 3

[0047] The smelting and pouring method of investment casting aluminum alloy of the present invention includes the following steps:

[0048] 1) Alloy melting

[0049] When the temperature in the furnace is 690℃, add pure aluminum, aluminum-silicon master alloy, pure copper, and pure manganese into the furnace, wherein the mass ratio of pure aluminum, aluminum-silicon master alloy, pure copper, and pure manganese is 100 :2:0.4:0.08, increase the heating power as much as possible during the raw material heating stage to speed up the alloy melting speed. After the raw materials begin to dissolve, add the covering agent (the covering agent is a mixture of potassium chloride and sodium chloride, The mass ratio is 1:1), the amount of covering agent added is 1.5% of the mass of pure aluminum, so that the alloy liquid level is always in a protected state; after all the raw materials are melted, pure magnesium is added to it with a bell jar, and the amount of pure magnesium added is pure alu...

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Abstract

The invention discloses a smelting and pouring method of investment casting on an aluminum alloy. The method comprises the following steps: 1) alloy smelting: smelting pure aluminum, aluminum-silicon intermediate alloy, pure copper and pure manganese at a temperature of 680 to 700 DEG C, adding a covering agent, adding pure magnesium after complete smelting; heating to 700 to 720 DEG C; adding a refined degassing agent for several times and refining for 3 to 10 minutes to obtain aluminum alloy liquid; 2) mold shell roasting: roasting ceramic mold shell to be poured for 30 to 40 minutes at a temperature of 1050 to 1100 DEG C, and then cooling to 800 to 1000 DEG C for subsequent use; 3) pouring and molding: cooling the aluminum alloy liquid obtained in the step 1) to 620 to 670 DEG C and pouring into the ceramic mold shell subjected to the treatment in the step 2) to obtain a pre-casting piece; and 4) cooling for demoulding: cooling the pre-casting piece obtained in the step 3) to the room temperature and removing the ceramic mold shell to obtain the finished aluminum alloy casting. According to the smelting and pouring method disclosed by the invention, after a lower smelting temperature is adopted, the smelting temperature of the aluminum alloy is effectively reduced, the defects of slag inclusions and air pores are overcome, and the acceptability of the aluminum alloy investment castings is increased.

Description

Technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a melting and casting method of investment casting aluminum alloy. Background technique [0002] In the existing investment casting aluminum alloy smelting process, in order to ensure that the alloy liquid can fill the mold smoothly after pouring, the aluminum alloy is melted at a temperature of 550-600°C, and then the temperature is continued to be heated to 730-760°C for removal. Refining treatment such as gas and deterioration. Then the overheated aluminum alloy liquid is cooled to 700-730°C for pouring. After the ceramic mold used in aluminum alloy investment casting is fired at a high temperature of 1050-1200°C, the temperature is lowered to 300-350°C and the alloy liquid is poured. However, due to the high melting temperature, the alloy liquid will be oxidized in a large amount in the process to form oxide slag, and a large amount of gas will be absorbed. In the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04C22C1/03C22C1/06C22C21/00
CPCB22C9/04C22C1/026C22C1/03C22C1/06C22C21/00
Inventor 孙克强王正宗王京力朱军燕
Owner INSPECTION AND QUARANTINE TECHNOLOGY CENTER ZHONGSHAN ENTRY EXIT INSPECTION AND QUARANTINE