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Light alloy semi-solid slurry preparation device

A semi-solid slurry and preparation device technology, applied in the direction of stirring devices, mixers with rotating stirring devices, mixers, etc., can solve the problems of poor reliability of continuous work, cumbersome cleaning and maintenance, and low control precision, and achieve rapid preparation , similar grain size and high shear strength

Inactive Publication Date: 2013-07-03
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of existing semi-solid slurry preparation devices, such as complex equipment, poor continuous operation reliability, low control precision, and cumbersome cleaning and maintenance, and provide a device for light alloy semi-solid slurry preparation. The device adopts a mechanical stirring method, so that the alloy melt is subjected to shearing and stirring during the continuous cooling process, thereby forming forced convection, promoting the heterogeneous nucleation of the alloy melt and the dissociation of primary grains, and obtaining Semi-solid metal rheological paste with a certain proportion of spherical primary solid phase uniformly distributed

Method used

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  • Light alloy semi-solid slurry preparation device
  • Light alloy semi-solid slurry preparation device
  • Light alloy semi-solid slurry preparation device

Examples

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Effect test

example 1

[0030] This implementation example is to prepare aluminum alloy semi-solid slurry. The material used is ZL101A aluminum alloy for industrial use, and its composition is (weight percentage): Si: 6.93%, Mg: 0.38%, Ti: 0.15%, Fe: 0.17%, Ni: 0.05%, Zn: 0.01%, Cu: 0.01%, Mn: 0.01%, Sn: 0.01%, and the rest is Al. The liquidus and solidus temperatures of the ZL101A alloy are 615°C and 560°C, respectively.

[0031] The specific process is as follows:

[0032] 1) Melt the ZL101A aluminum alloy in a crucible resistance furnace, and when the temperature of the alloy reaches about 720°C, add C 2 Cl 6 Refining (the amount added is 0.5% of the total weight of the alloy liquid), C 2 Cl 6 Use a bell jar to press into the bottom of the aluminum alloy liquid and swing gently to make the aluminum alloy liquid boil completely. When there are no more air bubbles in the bell jar, use a skimmer to remove the scum. Lower the temperature of the alloy liquid to 630°C and keep it warm.

[0033] 2...

example 2

[0036] This implementation example is to prepare magnesium alloy semi-solid slurry. The material used is industrial AZ91D alloy, and its composition is (weight percentage) Al: 9.45%, Zn: 0.66%, Mn: 0.20%, Si: 0.036%, Fe : 0.0009%, Cu: 0.0047%, Ni: 0.001%, Be: 0.0007%, and the rest is Mg. The liquidus and solidus temperatures of AZ91D alloy are 595°C and 470°C, respectively.

[0037] The specific process is as follows:

[0038] 1) First put the AZ91D ingot into a crucible resistance furnace with a preheating temperature of 400°C, and refine it after the temperature of the alloy liquid reaches 720°C. During the melting process, the magnesium alloy in the furnace is protected by argon gas and covering agent, and the slag is removed After cleaning, lower the temperature of the alloy liquid to 620°C and keep it warm.

[0039] 2) Set the temperature of the stirring chamber of the device of the present invention to 570°C, turn on the speed regulating motor to make the stirring scre...

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Abstract

A light alloy semi-solid slurry preparation device belongs to the technical field of semi-solid metal processing. The device comprises a discharge hole 1, a graphite plunger 2, a discharge core rod 3, a heating cooling element 4, a stainless steel outer cylinder 5, a graphite inner liner 6, a stirring screw rod 7, an insulating layer 8, a charge hole 9, a graphite heat insulation ring 10, a bearing pedestal 11, a transmission gear 12, a pressure spring adjusting handle 13, a discharge handle 14, a bearing 15, and a support 16. According to the invention, based on a high speed shearing deformation principle, forced convection is produced when the alloy melt is under the action of the stirring screw rod during the continuous cooling process; the primary solid phase is crushed, spheroidized,or directly grows into a sphere under the action of a shear stress field, and thus semi-solid alloy slurry is prepared. The advantages of the invention are that: the structure is simple and compact; the operation is convenient; the device is easy to clean; the control precision is high; the continuous work is stable and reliable; the integrated technical process from light alloy semi-solid slurrypreparation to rheological forming is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of semi-solid metal processing, in particular to a device and method for preparing light alloy semi-solid alloy rheological slurry or billet. Background technique [0002] In the early 1970s, researchers such as M C Flemings of the Massachusetts Institute of Technology created the concept, theory and technology of metal semi-solid forming (literature Spencer D B, Mehrabian R, Flemings M C. Reological behavior of Sn-15%Pb in the crystallization range. Metallurgical Transactions, 1972, 3(7):1925-1932). Semi-solid processing is a method of forming using the characteristics of metals in the process of transitioning from liquid to solid or from solid to liquid (that is, the coexistence of liquid and solid). This new forming method combines the strengths of solidification processing and plastic processing. That is, the processing temperature is lower than that of the liquid state, the filling is stable, and the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F7/08C22C1/02F27D27/00C22C21/02C22C23/02
Inventor 康永林张帆张军周冰
Owner UNIV OF SCI & TECH BEIJING
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