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Collapsible mold and method of manufacturing the same

A collapsible and lost-wax casting technology, which is applied in the manufacture of tools, casting molding equipment, casting molds, etc., can solve problems such as rough surfaces, insufficient inhibition of mold absorption of moisture, and inability to store cores for a long time, so as to inhibit water absorption properties, and the effect of improving surface properties

Inactive Publication Date: 2010-09-29
SUZUKI MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the core cannot be stored for a long time
In addition, once the core swells by absorbing moisture, there is a problem in that it has a rough surface, so that a good casting surface cannot be obtained at the time of casting
However, since both the outermost surface coating and the surface coating are air-permeable, it is not sufficient to inhibit the mold from absorbing moisture.

Method used

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  • Collapsible mold and method of manufacturing the same
  • Collapsible mold and method of manufacturing the same
  • Collapsible mold and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] Embodiment 1: Method for manufacturing salt core

[0020] Hereinafter, a method of manufacturing the collapsible mold according to the present invention in the case where the collapsible mold according to the present invention is a salt core will be explained. The method of manufacturing the salt core includes the following steps: melting and manufacturing a modular composition; casting the salt core; and contacting the salt core with carbon dioxide. The salt core is cast by the following steps: melting and manufacturing the mold composition; and casting the mold composition.

[0021] Steps to melt and make modular compound

[0022] In the step of melting and manufacturing the modular composition for the salt core, materials containing the salt to be melted, the alkaline earth metal compound, and the refractory material are mixed. The alkaline earth metal compound is preferably calcium hydroxide, magnesium hydroxide, calcium oxide, and magnesium oxide.

[0023] As the salt, f...

Embodiment approach 2

[0038] Embodiment 2; Lost wax casting mold

[0039] Next, a method of manufacturing a collapsible mold according to Embodiment 2 of the present invention in a case where the collapsible mold is a lost wax casting mold will be explained. The manufacturing method according to this embodiment includes the following steps: preparing a modular composition; molding the modular composition; sintering the molded part; and treating the formed molded part with carbon dioxide.

[0040] Steps to prepare modular composition

[0041] In the step of preparing the modular composition, a material containing at least one of a refractory material, a binder, and calcium carbonate and magnesium carbonate is mixed.

[0042] For calcium carbonate and magnesium carbonate, one of these substances or a mixture of these substances can be used. Calcium carbonate and magnesium carbonate are preferably mixed to form 5% to 75% by weight of the modular composition. When the content of these substances is less than...

Embodiment

[0066] Cast core; salt core

[0067] The modular composition was prepared by mixing 27.8% by weight of NaCl, 34.7% by weight of KCl, 11.2% by weight of mullite, and 26.3% by weight of slaked lime. The mold composition is melted by being heated to 750°C and then poured into a mold for forming a core. The core was removed from the mold, and the core was exposed to a carbon dioxide environment at temperatures of 500°C, 400°C, and 300°C, respectively. Then, the core in the environment is naturally cooled to room temperature. Moreover, the other core that was being cast at the same time was naturally cooled in the atmosphere, and then exposed to a carbon dioxide environment at room temperature. These cores are stored in low humidity containers (room temperature, 40% humidity) for 2 days or 30 days. After that, the surface state of the core was compared by using a stereo microscope.

[0068] Table 1 shows the comparison results. In the case where the carbon dioxide treatment was per...

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Abstract

The invention relates to a collapsible mold and a method of manufacturing the same. In a collapsible mold and a method of manufacturing the same, the collapsible mold has extremely low moisture-absorption properties, does not change in surface properties thereof due to absorption of moisture and swelling, and is storable for a long time without absorbing moisture and swelling. Specifically, the method manufactures a collapsible mold containing at least any of calcium oxide and magnesium oxide. The method includes a step of bringing the collapsible mold into contact with carbon dioxide immediately after a step of burning the collapsible mold or a step of casting the collapsible mold.

Description

Technical field [0001] The present invention relates to a collapsible mold and a method of manufacturing the collapsible mold. Background technique [0002] For high pressure die casting, many technologies for casting products with undercuts have been developed so far. In these technologies, collapsible cores mainly containing sand or salt are used to cast the products, and then After casting, the collapsible core is dissolved and removed. In order to improve the collapsibility of the core, a method is known in which an alkaline earth metal compound that expands when reacting with water is added to a core material mainly containing water-soluble components such as salts (for example, refer to JP 2006 -7234A). However, cores made by mixing slaked lime (calcium hydroxide), quicklime (calcium oxide), etc., which are alkaline earth metal compounds, need to be stored in a humidity-controlled container. This is because the alkaline earth metal oxide produced by the thermal decomposi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10
CPCB22C9/105B22C9/04
Inventor 林千岁石黑智明山崎太郎胁坂充堺达则野村雅也
Owner SUZUKI MOTOR CORP
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