Honda Motor Co., Ltd.

Keita Yoshiara

Atsushi Yamashita

Hiroshi Furusawa

Hiromi Fujita

Ken Tomeba

Takashi Ikekita

Mitsuaki Ueno

Yoshimichi Oguri

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

Object: To provide a small-sized, durable metal mold structure capable of casting two cylinder blocks at a time. Solution: A metal mold structure for casting two cylinder blocks W at a time, comprises left and right inner slide coresbeing interposed between two cylinder blocks W, hydraulic cylinder unitsadapted to move each of these left and right inner slide cores, inclined holesbeing provided in each of the left and right inner slide cores, and inclined pinsbeing provided on a fixed moldand inserted into the inclined holeswith a predetermined clearance C, Cmaintained respectively, wherein, when the fixed moldis operated, each of the inclined pinspushes a wall surface of the inclined holein such a way as to move the left and right inner slide coresin a mold opening direction respectively. Preferably, the clearances C, Care different with respect to the left and right inner slide cores

Metal mold structure and casting method

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Tochigi, Japan

Keita Yoshiara