Ryobi Limited

Yoshiaki Egoshi

Hirotake Usui

Hitoshi Ishida

Noriyoshi Yamauchi

Toru Komazaki

Yasuhiro Sugioka

Hideto Sasaki

Joji Umeda

Jyoji Umeda

A laminar flow injection molding apparatus and a laminar flow injection molding method capable of directly judging flow mode of molten metal flowing into a metal mold, either laminar flow mode or turbulent flow mode. An injection molding apparatus includes metal molds in which a runner portion, a cavity, and a gas vent passage are formed in communication with a casting sleeve. Molten metal detection members are provided in confrontation with at least one of the runner portion, the cavity and the gas vent passage. In a single injecting operation, molten metal detection signal is generated each time the molten metal is brought into contact with the detection member. The molten metal detection member is connected to a counter circuit where numbers of the detection signals are stored as a count value. A judgment circuit to which a preset value is inputted is electrically connected to the counter circuit so as to compare the count value with the preset value. Since flow mode of the molten metal can be directly detected, quality of the casted product can be determined even during the casting process, to thereby enhance productivity.

Laminar flow injection molding apparatus and laminar flow injection

The horizontal type casting machine is capable of facilitating installation of a water jacket core and providing sufficient fluidity of the molten metal without generation of gas defect in casting a water-cooled type cylinder block. In the horizontal type casting machine, a cavity for the cylinder block is oriented vertically in which a cylinder bore portion of the cylinder block is positioned up and a crank chamber is positioned down. The cavity is defined by a stationary die, a movable die and movable cores. A movable slide core is provided movable relative to the movable die. When the movable slide core is moved to its retracted position, large working space is provided for installing the water jacket core at a given position. By the retracted movement of the movable slide core, large working space can be provided, thereby facilitating installation of the water jacket core. Further, since the water jacket core is set in its suspended fashion, easy positioning of the water jacket core results.

Metal mold arrangement for casting water-cooled type cylinder block in

A sand core adapted for high pressure casting is formed by a core body and a support pin to be connected to the core body. The support pin is provided with one end portion to be embedded in said core body and the other end portion projected outwardly from the core body. A connecting means is formed to the embedded portion so as to integrally connect the core body and the support pin and a support pin positioning and supporting means is formed at the projecting portion of the support pin. Positioning pins extending from a core formation mold are engaged with the positioning and supporting means so that the embedded end portion of the support pin is positioned in the cavity of the core formation mold. The cavity is filled with core sand whereby the embedded one end of the support pin is supported to integrally form the support pin and the core body. The sand core is dipped in a slurry including a sand core coating material and then heated and dried.

High pressure casting sand core and method of manufacturing the same

Disclosed is a collapsible core for use in a casting and a method for producing the collapsible core. The collapsible core comprises a main core body, a first layer formed over the core body, a second layer formed over the first layer, and a third layer formed over the second layer. The second layers includes a thermosetting resin such as low temperature decomposable resin. The low temperature decomposable resin comprises one of urea resin and phenol resin. The thermosetting resin is applied to the first layer by dipping, spraying or brush-painting. This thermosetting resin provides tight bonding to the neighbouring layers.

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Fuchu, Japan

Yoshiaki Egoshi