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Method and apparatus for thixotropic molding of semisolid alloys

A molding method and semi-solid technology, applied in the field of semi-solid alloy injection molding and equipment, can solve the problems of increasing manufacturing and maintenance costs, dendrite degradation, slurry back leakage, etc., so as to reduce maintenance costs, reduce construction materials, The effect of simplifying process operations

Inactive Publication Date: 2004-08-18
刘伟杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 2. The use of the screw not only increases the manufacturing and maintenance costs of the equipment, but also causes process problems such as slurry back leakage
[0007] 3. The sleeve must be opened and cleaned when changing the type of alloy to be processed
However, in the case of insufficient agitation, too complete dendrites in the swarf, or too high a solids content in the slurry, the dendrites may degenerate insufficiently
This can lead to shrinkage cavity defects in die castings, especially in thin-walled parts

Method used

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  • Method and apparatus for thixotropic molding of semisolid alloys
  • Method and apparatus for thixotropic molding of semisolid alloys
  • Method and apparatus for thixotropic molding of semisolid alloys

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Embodiment Construction

[0034] The main difference between the injection molding method provided by the present invention and existing methods is that it does not use conventional extrusion screws or pistons. In this way, while retaining most of the characteristics of traditional injection machines, equipment and operating costs can be greatly reduced.

[0035] The method is realized by the following steps: a non-dendritic raw material rod is fed into an extrusion sleeve, and a given length of the end of the raw material rod is heated to a temperature between its solidus line and liquidus line A semi-solid slurry is produced and the solid portion of the stock rod is used to act like a disposable piston to inject the semi-solid slurry in front of it into a mold cavity.

[0036] The above steps can be used as figure 1Shown injection molding machine (10) to complete. The injection machine (10) comprises an extrusion sleeve (11) equipped with an injection nozzle (12) at the front end. The nozzle (12) ...

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Abstract

A method and apparatus for thixotropic molding of semisolid alloys are disclosed. The method comprises of feeding a dendritic-free feedstock bar into an extruder barrel, melting a terminal portion of the feedstock bar into a semisolid slurry by heating it to a temperature between its solidus and liquidus temperatures, and using the solid portion of the feedstock bar as an one-time 'plunger' to inject the semisolid slurry into a mold cavity. The apparatus based on the present method, which is equipped without a regular extruder screw or plunger, uses a feedstock bar as a one-time plunger to inject semisolid slurries formed from a terminal portion of the same feedstock bar.

Description

Technical field [0001] The present invention relates to a semi-solid metal material injection molding method and equipment, which is characterized in that it does not need a conventional extruding sleeve or piston, but uses a non-dendritic alloy raw material rod to transform the semi-solid state formed by its own end. Solid alloy slurry is injected into a mold cavity. Background technique [0002] Injection molding is a new metal forming technology; the process is to convert the alloy raw material into a semi-solid slurry with spherical metal particles dispersed in the continuous liquid phase metal, and then inject the slurry into a inside the mold cavity. Compared with the traditional high-pressure die-casting process, injection-molded parts have the following advantages: 1) no porosity, because the semi-solid slurry has non-Newtonian viscosity (ie, viscosity is inversely proportional to the shear rate); 2) shrinkage is small , because the slurry contains solid phase comp...

Claims

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Application Information

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IPC IPC(8): B22D17/00B22D23/06
CPCB22D17/007B22D17/2281
Inventor 刘伟杰
Owner 刘伟杰
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