Honda Motor Co., Ltd.

Hiromi Fujita

Hiroshi Furusawa

Kenichi Katahira

Keita Yoshiara

Takayuki Higashi

Masanori Masubuchi

Mitsuaki Ueno

Hiroshi Matsushita

Ken Tomeba

Kunihiro Yokoyama

Yoshinori Kubo

Takanori Niwa

Provided is a highly versatile casting mold in which weight and manufacturing cost can be reduced, and whereby flash can be suppressed. A plate-shaped base part having a flat attachment face to which a back face of a fixed-cavity mold is attached is provided to a fixed mold constituting a casting mold. A portion of the base part in contact with the back face of the fixed-cavity mold has an attachment part body for supporting the fixed-cavity mold, and a pressure increasing means for increasing the pressure imparted to the fixed-cavity mold via the attachment part body in a state in which the mold is closed.

Casting mold

In the sand core, the tar reducing agent is included in at least the second coating layer, which is the outermost layer, of the coating layersand. Thus, the tar, which may be generated from the core bodyand the coating layersandwhich are positioned thereinside, can be decomposed into low molecular gases (carbon monoxide, carbon dioxide, water, and the like) by heat of the molten metal. As a result, generation of the tar from the sand coreto the outside can be prevented. In this case, since the layer which includes the tar reducing agent is the second coating layerwhich directly contacts the molten metal, the second coating layercan directly receive the heat of the molten metal, and the tar generation prevention effects can be thereby remarkably obtained. Therefore, generation of defects in cast products which may be caused by clogging in the gas drain can be prevented, and structures of the gas drain of the die and the surroundings thereof can be simplified.

Sand core for casting and process for producing the same

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Sakura, Japan

Hiromi Fujita