Expendable salt core for casting

Inactive Publication Date: 2009-11-26
YAMAHA MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The preferred embodiments of the present invention have been made to solve the above problems, and facilitate a manufacture of a water soluble expen

Problems solved by technology

When the cast product has a complicated internal structure, it is not easy to remove if a generally used phenol resin bonded sand core is used as the expendable core.
However, when an expendable fused salt core is formed by melting a salt and casting, the formation of a shrinkage cavity, micro-porosity, small heat crack, or the like would be caused

Method used

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  • Expendable salt core for casting
  • Expendable salt core for casting
  • Expendable salt core for casting

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Example

[0024]Preferred embodiments of the present invention will be described hereinafter with reference to the drawings. First, the manner in which an expendable salt core according to a preferred embodiment of the present invention is used will be described with reference to FIG. 1. FIG. 1 is a partially cutaway perspective view of a closed-deck type cylinder block which is cast using the expendable salt core according to a preferred embodiment the present invention. Referring to FIG. 1, reference numeral 1 denotes a closed-deck type cylinder block which is made of, for example, an aluminum alloy and cast using an expendable salt core 2 according to a preferred embodiment of the present invention. The cylinder block 1 is, for example, a portion of a water cooling 4-cycle 4-cylinder engine for a motorcycle which is molded into a predetermined shape by high pressure die casting (HPDC).

[0025]The cylinder block 1 shown in FIG. 1 is integrally provided by four cylinder bores 3, a cylinder bod...

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Abstract

An expendable salt core has the shape of a water jacket by, e.g., die casting using a salt of bromine and at least one of sodium and potassium, and a salt of carbonic acid and at least one of sodium and potassium. The expendable salt core is formed to contain at least one of potassium and sodium as a cation, and bromine and carbonic acid as anions. For example, the expendable salt core is formed by casting using a melt obtained by melting a salt mixture of sodium bromide and sodium carbonate.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a water soluble expendable salt core.[0003]2. Description of the Related Art[0004]As is well known, casting, such as aluminum high pressure die casting (HPDC), is a technique that injects a molten aluminum alloy into a metal mold at a high speed under high pressure to cast a near-net-shape structure. In this casting, when molding a cast product having a hollow structure, e.g., a water cooling water jacket in the closed-deck type cylinder block of an internal combustion engine, an expendable core is used. The expendable core used in such a case must have a strength that can withstand a high pressure and high temperature because it may be subject to a large impact or impulse force fluctuation upon collision of a molten metal injected from the gate at high speed mold filling and because a high static compressive casting pressure is applied until completion of solidification. After casting, ...

Claims

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Application Information

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IPC IPC(8): B22D18/00
CPCB22C9/105
Inventor YAOKAWA, JUNANZAI, KOICHIYAMADA, YOUJI
Owner YAMAHA MOTOR CO LTD
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