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Machining process for reducing internal shrinkage cavity defect of aluminum alloy die castings

A processing technology and aluminum alloy technology, which is applied in the field of die casting processing, can solve problems such as scrapping die castings, restricting the quality and production efficiency of die castings, affecting the mechanical properties and product quality of aluminum alloy die castings, etc.

Inactive Publication Date: 2021-01-19
HEXIAN KEJIA VALVE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shrinkage cavity and shrinkage defects directly affect the mechanical properties and product quality of aluminum alloy die castings, and even lead to the scrapping of die castings. Although some minor defects can be rescued by repair welding, they restrict the quality and production of die castings efficiency

Method used

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  • Machining process for reducing internal shrinkage cavity defect of aluminum alloy die castings

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A processing technology for reducing shrinkage cavity defects inside aluminum alloy die castings, the specific technology is as follows:

[0017] 1) According to the mass volume ratio of 1:100g / mL, dissolve the weighed cadmium acetate dihydrate in anhydrous methanol to form a transparent solution, transfer the solution into a hydrothermal reaction kettle, and react at 200°C for 6h. After the end, wash the precipitate at the bottom of the kettle with anhydrous methanol several times, dry it, put it in a porcelain boat and put it in a muffle furnace, heat it to 450°C at a heating rate of 2°C / min, heat it for 90min, and cool it with the furnace. Obtain cadmium oxide microspheres after taking;

[0018] 2) According to the volume ratio of 1:5, dissolve polyethylene glycol-400 in deionized water, add manganese sulfate solution with a concentration of 0.3mol / L equal to the volume of deionized water, and stir at 100r / min for 30min to obtain Mix the solution, and then measure t...

Embodiment 2

[0022] A processing technology for reducing shrinkage cavity defects inside aluminum alloy die castings, the specific technology is as follows:

[0023]1) According to the mass volume ratio of 1:110g / mL, dissolve the weighed cadmium acetate dihydrate in anhydrous methanol to form a transparent solution, transfer the solution into a hydrothermal reaction kettle, and react at 205°C for 7h. After the end, wash the precipitate at the bottom of the kettle with anhydrous methanol several times, dry it, put it in a porcelain boat and put it in a muffle furnace, heat it to 460°C at a heating rate of 2°C / min, heat it for 110min, and cool it with the furnace. Obtain cadmium oxide microspheres after taking;

[0024] 2) According to the volume ratio of 1:6, dissolve polyethylene glycol-400 in deionized water, add manganese sulfate solution with a concentration of 0.35mol / L equal to the volume of deionized water, and stir at 120r / min for 35min to obtain Mix the solution, then measure the ...

Embodiment 3

[0028] A processing technology for reducing shrinkage cavity defects inside aluminum alloy die castings, the specific technology is as follows:

[0029] 1) According to the mass volume ratio of 1:120g / mL, dissolve the weighed cadmium acetate dihydrate in anhydrous methanol to form a transparent solution, transfer the solution into a hydrothermal reaction kettle, and react at 210°C for 8 hours, and wait for the reaction After the end, wash the precipitate at the bottom of the kettle with anhydrous methanol several times, dry it, put it in a porcelain boat and put it in a muffle furnace, heat it to 480°C at a heating rate of 3°C / min, heat it for 120min, and cool it with the furnace. Obtain cadmium oxide microspheres after taking;

[0030] 2) According to the volume ratio of 1:7, dissolve polyethylene glycol-400 in deionized water, add manganese sulfate solution with a concentration of 0.4mol / L equal to the volume of deionized water, and stir at 130r / min for 40min to obtain Mix ...

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Abstract

The invention discloses a machining process for reducing the internal shrinkage cavity defect of aluminum alloy die castings, and relates to the technical field of die casting machining. The process specifically includes the following steps: 1) preparing cadmium oxide microspheres; 2) preparing manganese dioxide nanorods; 3) smelting raw materials of the aluminum alloy die castings to obtain an aluminum alloy solution, and adding the cadmium oxide microspheres and the manganese dioxide nanorods to the aluminum alloy solution to obtain a material A; and 4) vacuumizing a die cavity, injecting the material A into the die cavity under a high vacuum condition, and demolding to obtain the aluminum alloy die casting. According to the machining process provided by the invention, the defects of shrinkage cavities and shrinkage porosity in the die castings can be effectively reduced, so that the phenomena of shrinkage cavities and shrinkage porosity are effectively controlled in the production of the die castings, and the quality and the production efficiency of the die castings are improved.

Description

technical field [0001] The invention belongs to the technical field of die casting processing, and in particular relates to a processing technology for reducing shrinkage cavity defects inside aluminum alloy die castings. Background technique [0002] The principle of die-casting process is to use high pressure to press molten metal into a precision metal mold cavity at high speed, and the molten metal is cooled and solidified under pressure to form a casting. Die-casting has high production efficiency and can die-cast die-casting parts with complex shapes, precise dimensions, clear outlines, high surface quality, strength and hardness, so it is widely used and developed rapidly. At present, die-casting alloys are widely used in die-casting aluminum alloys. Die-casting aluminum alloys have good performance and process performance, so the die-casting of aluminum alloys has developed rapidly and has been widely used in various industrial sectors. [0003] In addition to meet...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/03C22C21/00C22C32/00B22D17/00
CPCC22C1/1036C22C21/00C22C32/001B22D17/00C22C1/1047
Inventor 黎宏倪明主黎思瑶
Owner HEXIAN KEJIA VALVE CASTING
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