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Injection molding process of AZ91 Mg alloy

An injection molding, magnesium alloy technology, applied in the field of magnesium alloy forming, can solve the problems of many inclusions, inability to produce parts with complex shapes, and many molding processes

Inactive Publication Date: 2007-08-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper alloy parts prepared by precision casting or casting + cutting are prone to defects such as composition segregation, uneven structure, and many inclusions, and these two processes have low production efficiency and high production costs, making it difficult to achieve mass production
Cutting after die casting will also cause a lot of waste of raw materials
Magnesium alloys with higher performance can be prepared by extrusion forging, but this method also has disadvantages such as difficult control of forging temperature, many forming processes, complex mold design, etc., and this method cannot produce parts with complex shapes, which affects the forming method. the widespread use of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw materials: the binder is composed of 78% PEG, 20% PMMA, and 2% SA by mass percentage, the average particle size of AZ91 magnesium alloy powder is 47 μm, and the powder loading is 66 vol%.

[0016] Mix the powder and the prepared binder on an open rubber mixer for 1.5 hours, the mixing temperature is 70°C, and then granulate on a mixing extruder to make the feed mix evenly. The feed material after granulation is injected under the conditions of injection temperature of 80 ° C and injection pressure of 100 MPa to obtain a magnesium alloy preform of the desired shape, and then the preform is immersed in deionized water for 6 hours for degreasing, and the degreasing temperature is 30 ℃, after the degreasing is completed, take out the blank and dry it in a constant temperature drying oven. The thermal degreasing is carried out between 30 and 400 ℃ for a total of 10 hours. After degreasing, heat the degreased blank to 630 ℃ for 1 hour. Pure argon, that is, copper alloy pa...

Embodiment 2

[0018] Raw materials: the binder is composed of 70% PEG, 25% PMMA, and 5% SA by mass percentage, the particle size of AZ91 magnesium alloy powder is 47 μm, and the powder loading is 60 vol%.

[0019] Mix the powder and the prepared binder on an open rubber mixer for 1.5 hours, the mixing temperature is 70°C, and then granulate on a mixing extruder to make the feed mix evenly. The feed material after granulation is injected under the conditions of injection temperature of 75 °C and injection pressure of 90 MPa to obtain a copper alloy preform of the desired shape, and then immerse the preform in deionized water for 7 hours for degreasing, and the degreasing temperature is 30 ℃, after the degreasing is completed, take out the blank and dry it in a constant temperature drying oven. The thermal degreasing is carried out between 30 and 410°C, and the total degreasing is 12 hours. Pure argon. That is to say, a magnesium alloy part with a relative density of 97%, a tensile strength ...

Embodiment 3

[0021] Raw materials: the binder is composed of 75% PEG, 22% PMMA, and 3% SA by mass percentage, the particle size of AZ91 magnesium powder is 32 μm, and the powder loading is 64 vol%.

[0022] Mix the powder and the prepared binder on an open rubber mixer for 1 hour at a mixing temperature of 70°C, and then granulate on a mixing extruder to make the feed mix evenly. The granulated feed is injected under the conditions of an injection temperature of 85 °C and an injection pressure of 95 MPa to obtain a copper alloy preform of the desired shape, and then immerse the preform in deionized water for 6 hours for degreasing, and the degreasing temperature is 40 ℃, after the degreasing is completed, take out the blank and dry it in a constant temperature drying oven. The thermal degreasing is carried out between 30 ~ 420 ℃ for a total of 8 hours. After degreasing, heat the degreased blank to 600 ℃ for sintering. The protective atmosphere is high-purity argon. That is to say, a magne...

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Abstract

The injection molding process of AZ91 magnesium alloy belongs to the field of magnesium alloy forming technology. The injection molding process includes the following steps: mixing AZ91 magnesium alloy powder in size of 47 micron and water soluble adhesive of PEG and PMMA in certain ratio, pelletizing, injection molding, solvent defatting and heat defatting to eliminate adhesive, and sintering at 580-620 deg.c under inert gas protection to obtain the product. The present invention has the advantages of low cost and capacity of producing magnesium alloy of complicated shape and excellent performance.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy forming, and in particular provides a magnesium alloy injection molding method for AZ91 (a type of magnesium alloy containing about 9wt.% of Al, about 1% of Zn, and other magnesium and a small amount of impurities). It is suitable for preparing magnesium alloy parts with high performance, high dimensional accuracy and complex shapes. Background technique [0002] Magnesium alloy is currently the lightest metal structural material, with high specific strength and specific stiffness, excellent heat dissipation, electromagnetic shielding, damping and shock absorption, high strain rate energy absorption characteristics, impact resistance and other physical properties, and the product meets environmental protection requirements. recycle and re-use. Since the 1990s, with the breakthrough of the two bottlenecks of technology and price, the consumption of magnesium alloys in the world has increas...

Claims

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Application Information

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IPC IPC(8): B22F3/115B22F3/20
Inventor 何新波曲选辉姜海祝丽叶
Owner UNIV OF SCI & TECH BEIJING
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