Cope/drag interface sealing article for the metal casting industry, and method

a technology of metal casting and interface sealing, which is applied in the direction of moulding flaks, manufacturing tools, moulding apparatus, etc., can solve the problems of castings showing defects, epa violations, and hazardous working conditions for foundry personnel

Inactive Publication Date: 2005-04-07
AMCOL INTERNATIONAL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Still another aspect of the compositions, articles and methods described herein is to provide a sealing article for sealing imperfectly formed mold cavi...

Problems solved by technology

When the grains are too close, the molding sand moves and expands causing the castings to show defects such as “buckles” (a deformity in the casting resulting from excessive sand expansion), “rat tails” (a rough, irregular depression that appears on the surface of a casting or a minor buckle), and “scabs” (a breaking away of a portion of the molding sand when hot metal enters the mold).
A major problem with the asphaltic cope rope is that the high temperature of ...

Method used

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  • Cope/drag interface sealing article for the metal casting industry, and method
  • Cope/drag interface sealing article for the metal casting industry, and method
  • Cope/drag interface sealing article for the metal casting industry, and method

Examples

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Embodiment Construction

[0020]“approximately” one particular value and / or to “about” or “approximately” another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another embodiment.

[0021] In brief, there is described herein a new and improved fiber-reinforced composition and article for use at an interface, between upper and lower mold portions, in casting metal parts in the foundry industry. The compositions used to form the sealing articles described herein comprise about 35% to about 65% by weight clay, preferably a smectite clay such as sodium montmorillonite, water in an amount about 5% to about 15% by weight; a hygroscopic agent, such as glycerin, in an amount of about 20% to about 60% by weight; and reinforcing fibers, synthetic or natural, such as cotton fibers....

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Abstract

A fiber-reinforced sealing article disposed between an upper sand mold portion (cope) and lower sand mold portion (drag) to fill in, or correct irregularities in green sand molds. In casting metal shapes in a sand/binder mold, the cope and/or drag mold portions include sand compositions that are not perfectly planar surrounding the mold cavity, leaving one or more areas where the cope and drag are not in contact or otherwise provide a seal surrounding the mold cavity. The fiber-reinforced clay-containing article described herein is disposed between the cope and drag to seal the mold in one or more locations surrounding the mold cavity. The composition described herein is capable of shaping by hand, like modeling clay; and the article is preferably in the form of a continuous rope that is flexible, remains hydrated, and can be cut or broken to a desired length and disposed in area(s) where the cope and drag do not make good mating contact.

Description

FIELD OF THE INVENTION [0001] The present invention is directed to a fiber-reinforced clay-containing article for use in the foundry industry in the casting of molten metal. More particularly, the present invention is directed to an article in the form of a rope, pellet, particle bulk form particularly useful to provide a seal between an upper mold portion (cope) and lower mold portion (drag) to fill in, or correct irregularities in molds, particularly in green sand molds. In casting metal shapes in a sand / binder mold, the cope and / or drag mold portions include sand compositions that are not perfectly planar surrounding the mold cavity, leaving one or more areas where the cope and drag are not in contact, or otherwise do not provide a seal surrounding the mold cavity. The fiber-reinforced clay-containing article described herein is disposed between the cope and drag to seal the mold cavity in one or more locations surrounding the mold cavity. The composition described herein is capa...

Claims

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Application Information

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IPC IPC(8): B22C21/00B22D33/04
CPCB22C21/00
Inventor SOROKIN, ANATOLIYLOSACCO, VINCENT J.EISENHOUR, DON
Owner AMCOL INTERNATIONAL CORPORATION
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