Metallic materials for rheocasting or thixoforming and method for manufacturing the same

A metal raw material, thixoforming technology, applied in rheological casting or thixoforming metal raw material and its manufacturing field, can solve the problems of reducing cooling rate, increasing process time, etc.

Inactive Publication Date: 2004-03-31
洪 俊杓
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result there are many disadvantages such as

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  • Metallic materials for rheocasting or thixoforming and method for manufacturing the same
  • Metallic materials for rheocasting or thixoforming and method for manufacturing the same
  • Metallic materials for rheocasting or thixoforming and method for manufacturing the same

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Embodiment Construction

[0032]In a method of manufacturing metal feedstock for rheocasting or thixoforming according to the present invention, a molten metal in a vessel has the same temperature. Moreover, since the temperature of the entire vessel containing the molten metal is the same, including the center, inner walls, upper and lower regions of the vessel, latent heat caused by solidification behavior in specific regions at the beginning of cooling will not be affected. It will be produced so that the molten metal can be cooled rapidly in a short time. Therefore, the density of crystal nuclei in the molten metal will increase significantly, thereby forming micro, spherical particles.

[0033] Afterwards, the present invention will be described in detail.

[0034] According to the present invention, before the filling of a molten metal into a vessel is completed, an electromagnetic field is supplied to the vessel; that is, before, simultaneously with, or during filling of the molten metal into t...

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Abstract

A method for manufacturing a metallic material for rheocasting or thixoforming and a metallic material formed using the method are provided. The method includes: applying an electromagnetic field to a vessel and loading a molten metal into the vessel; and cooling the molten metal to form a metallic material for rheocasting or thixoforming. The entire volume of molten metal is rapidly and uniformly cooled throughout, from the wall toward the center of the vessel, without generating latent heat caused by the formation of solidification layers at the early stage of cooling. The molten metal in the vessel is cooled rapidly below its liquidus temperature within 1-10 seconds after the loading of the molten metal into the vessel, so that numerous uniform crystal nuclei are created throughout the entire volume of molten metal to form a metallic material having uniform, micro, spherical particles.

Description

technical field [0001] The present invention relates to, and in particular to, a metallic material for rheocasting or thixoforming and a method for its manufacture. Background technique [0002] Semi-solid or semi-melton metalworking combines casting and forging processes, and can be further divided into two types - rheocasting and thixoforming. In the rheocasting process, the finished product is directly cast from a slurry prepared from a semi-solid state. In the thixotropic forming process, a billet that has been formed from its semi-solid state is reheated to a half-molten state and then forged or die-cast into a finished product. [0003] Metal slurries for rheocasting or thixoforming are derived from a metal feedstock containing appropriate proportions of solid particles suspended in a liquid phase in the semi-solid temperature range, and are then transformed by their thixotropic properties into a It can easily change its shape with a small force, and then cast it wit...

Claims

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Application Information

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IPC IPC(8): B22D1/00B22D11/00B22D17/00B22D27/02B22D27/04B22D27/20C22C1/00C22C21/02
CPCC22C21/02C22C1/005B22D17/007B22D1/00C22C1/12
Inventor 洪俊杓金宰民金玟秀板村正行
Owner 洪 俊杓
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