Preparation method and device of semi-solid slurry

A technology of semi-solid slurry and preparation device, which is applied in the field of semi-solid slurry preparation, aluminum alloy and magnesium alloy semi-solid slurry preparation, and can solve the difficulty of controlling the consistency and stability of slurry quality, the difficulty of precise temperature control, It is easy to be involved in problems such as oxidation inclusions and gas defects, so as to reduce the involvement of oxide scale and air, good protection effect, and easy industrial-scale production control.

Active Publication Date: 2018-06-29
有研科技集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to accurately control the temperature, and it is very easy to get involved in oxidation inclusions and gas defects during the pulping process, and

Method used

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  • Preparation method and device of semi-solid slurry

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1:

[0029] The method is adopted to prepare A356 alloy (liquid line 615°C, solid phase line 555°C) semi-solid slurry. The melt temperature is maintained at 670°C. Choose mold steel to prepare crucible, and the wall thickness of crucible is 1mm. The inner wall of the crucible is coated with a 0.05mm corundum coating. Place multiple crucibles in a constant temperature furnace at 100°C for heat preservation. Take a crucible out of the constant temperature furnace, place it on a mechanical vibration platform and fix it, and seal the bottom. Spray nitrogen on the top of the crucible for protection. Pour the A356 alloy melt at 670°C into the crucible slowly. After reaching the specified height, the pouring process ends. Turn on the vibrating device to apply weak horizontal circular vibration to the crucible and the melt in the crucible. During the vibration process, there is laminar flow at the top of the melt in the horizontal direction, but no vertical flow, whi...

Example Embodiment

[0030] Example 2:

[0031] The method is adopted to prepare AZ91 magnesium alloy semi-solid slurry. The melt temperature is maintained at 700°C. Choose titanium alloy to prepare the crucible, and the wall thickness of the crucible is 10mm. The outer wall of the crucible is coated with a 0.1mm silicon carbide coating. Place multiple crucibles in a constant temperature furnace at 400°C for heat preservation. Take out a crucible from the constant temperature furnace, place it on the pulping platform and fix it, and seal the bottom. Spray argon on the top of the crucible for protection. Pour the AZ91 alloy melt at 700°C into the crucible slowly. After reaching the specified height, the pouring process ends. Extend another argon pipe with controllable flow into the middle and lower part of the melt vertically, such as figure 1 As shown, argon gas is used to perform gas disturbance treatment on the melt. During the aeration process, small bubbles are generated on the upper surfa...

Example Embodiment

[0032] Example 3:

[0033] The method is adopted to prepare 15% SiC particle reinforced A357 alloy composite material semi-solid slurry. The melt temperature is maintained at 700°C. Choose graphite to prepare the crucible, the wall thickness of the crucible is 50mm. Place multiple crucibles in a constant temperature furnace at 0°C for heat preservation. Take a crucible out of the constant temperature furnace, place it in the electromagnetic induction coil and fix it, with the bottom sealed, such as figure 1 Shown. Pour the composite material melt at 700°C into the crucible slowly. After reaching the specified height, the pouring process ends. A vacuum device is installed on the top of the crucible and evacuated. Start the electromagnetic induction coil to stir the melt in the middle and lower parts of the crucible, and the top remains static. After continuous electromagnetic stirring for 50 seconds, the temperature of the semi-solid slurry reached 565°C and the solid phase ...

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Abstract

The invention relates to a preparation method and device of semi-solid slurry and belongs to the technical field of semi-solid formation. The preparation method comprises the steps that molten metal melt is poured into a crucible container and cooled in the crucible container to the temperature between the liquid phase line temperature and the solid phase line temperature; inert gas shielding or vacuum shielding is performed on the melt in the cooling process of the metal melt, the metal melt in the crucible is subjected to weak disturbance treatment under the outfield effect, the liquid surface of the melt in the crucible is kept to be static or the melt keeps a weak laminar motion in the horizontal direction during disturbance treatment, surface layer oxide or gas is prevented from beinginvolved in, the outfield effect is stopped when the melt is cooled to be within the semi-solid temperature interval, and the semi-solid slurry in the crucible is poured into a pressure forming apparatus. The invention further discloses the preparation device adopted in the method. The semi-solid slurry prepared by the method and the device has the advantages of being high in purity, good in quality and consistency, easy to industrially produce and control, and the like.

Description

technical field [0001] The invention relates to a method and device for preparing semi-solid slurry, in particular to a method for preparing semi-solid slurry of aluminum alloy and magnesium alloy, belonging to the technical field of semi-solid forming. Background technique [0002] Semi-solid forming technology is a metal forming technology between solid state forming and liquid forming. This forming technology has the advantages of low flow stress in liquid forming, fast forming speed, and the ability to form parts with complex shapes. It also has the advantages of no casting defects, high dimensional accuracy, and good performance in solid-state plastic forming. Therefore, it has attracted widespread attention. One of the cores of semi-solid forming technology is the preparation of semi-solid slurry. Traditionally, a semi-solid billet is prepared by heating a solid billet with a special microstructure to a semi-solid temperature range through electromagnetic induction. ...

Claims

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Application Information

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IPC IPC(8): B22D17/20B22D1/00
CPCB22D1/002B22D17/007B22D17/20Y02P10/25
Inventor 李大全张帆陈颂王光宗
Owner 有研科技集团有限公司
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