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Composite shearing semi-solid state metal rheological slurry preparation method

A semi-solid metal and slurry technology, which is applied in the field of semi-solid metal slurry preparation, can solve the problems of small internal friction stirring force and inability to obtain alloy structure, etc., to achieve easy control, avoid high energy consumption, and temperature controllability Good results

Active Publication Date: 2008-10-01
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal friction stirring force provided by this method is relatively small, which may lead to the inability to obtain the ideal alloy structure in some cases.

Method used

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  • Composite shearing semi-solid state metal rheological slurry preparation method
  • Composite shearing semi-solid state metal rheological slurry preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The liquidus temperature of the A357 alloy used is 615°C; the inclination of the lower washboard used is 50°, the sliding length of the upper washboard is 500mm, and the sliding time of the upper washboard is 1.5S.

[0048] Precisely control the superheated A357 alloy liquid in the range of 690±3°C; quantitatively add 1-1.2Kg; preheat the upper washboard to 575-585±5°C, then control the temperature; the lower washboard is formed from the lower end to the upper end, and the temperature is from 575°C to 650°C gradient temperature field. The pressure of the upper washboard to the lower washboard is 7Mpa. The shearing time of the slurry is controlled to be 0.8-1.2s. T of A357 alloy ss = 575°C. Keep the slurry in the heat preservation mold at about 577±3°C for 3.5 to 5 minutes to control the solid phase fraction of the alloy slurry between 0.4 and 0.6. When enough semi-solid slurry is prepared, the semi-solid slurry is extruded into a cast iron mold by an extrusion cylin...

Embodiment 2

[0052] Magnesium alloy materials are light in weight. Taking the commonly used AZ91D as an example, its specific gravity is 1.8, which is only 1 / 4 of that of steel and about 2 / 3 of that of aluminum alloy. Compared with commonly used metals, magnesium alloys have many advantages such as higher specific rigidity, specific strength, machinability, vibration damping, thermal conductivity, and recyclability, as well as anti-electromagnetic wave characteristics. In recent years, under the trend of environmental protection and lightweight, magnesium alloy workpieces have gradually been widely used in 3C products and automobiles.

[0053] The liquidus temperature of the AZ91D magnesium alloy used is 595°C; the T of the AZ91D magnesium alloy ss =570°C; the inclination of the lower washboard used is 45°, the sliding length of the upper washboard is 480mm, and the sliding time of the upper washboard is 1.5S.

[0054] Precisely control the overheated AZ91D alloy liquid in the range of 61...

Embodiment 3

[0057] The liquidus temperature of the die steel Cr12 used is about 1600°C; the T of the die steel Cr12 ss =1400°C; the inclination of the lower washboard used is 55°, the sliding length of the upper washboard is 400mm, and the sliding time of the upper washboard is 1.2S.

[0058] Precisely control the superheated Cr12 alloy liquid in the range of 1690±10°C; quantitatively feed 3~3.5Kg; after the upper washboard is preheated to 1570~1615±5°C, the temperature is controlled; the lower washboard is formed from the upper end to the lower end, and the temperature is from 1650°C Gradient temperature field to 1390°C. The pressure of the upper washboard to the lower washboard is 6Mpa. The shearing time of the slurry is controlled to be 0.8-1.2S. The slurry is kept in a heat preservation mold at a temperature of about 1400±5°C for 15-30 seconds to control the solid phase fraction of the alloy slurry between 0.4 and 0.6. When enough semi-solid slurry was prepared, the semi-solid slur...

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Abstract

The invention relates to a method for preparing composite shear semi-solid metal rheological slurry, wherein it comprises that: (1), controlling the alloy liquid at 0-100Deg. C above liquid temperature TL; (2), controlling the temperature of upper rubbing board at TL-40Deg. C to TL+20Deg. C, and controlling the upper end of lower rubbing board at TL-50Deg. C to TL+50Deg. C, the lower end at Tss-20Deg. C to Tss+20Deg. C, and the temperature difference from upper end to lower end is 0.03-1Deg. C / mm; (3), putting the alloy liquid on lower rubbing board, using compress cylinder to compress the lower rubbing board; (4), the upper rubbing board carries alloy liquid to the discharger; insulating temperature, the alloy liquid is solidified into semi-solid metal slurry in ball shape or particle shape. The invention can be used in aluminum base alloy, copper base alloy, etc.

Description

technical field [0001] The invention relates to a method for preparing semi-solid metal slurry containing spherical or granular primary crystals by temperature-controlled quantitative pouring and compound shearing force application. Background technique [0002] Since the Massachusetts Institute of Technology (MIT) invented the semi-solid forming technology of spherical or granular primary crystals of metals and alloys in the early 1970s, countries around the world have paid extensive attention to and conducted a lot of research on semi-solid forming technology. applied to actual production. This is because the application of this technology has the following outstanding advantages: [0003] (1) Reduce the amount of air entrainment and solidification shrinkage during the forming process, and improve the compactness and strength of the blank; [0004] (2) Reduce component segregation and improve the uniformity of blank structure and performance; [0005] (3) Good formabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20C22F1/00
Inventor 李成栋朱学新石力开田战峰杨必成谢丽君张志峰徐骏
Owner 有研金属复材技术有限公司
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