Honda Giken Kogyo Kabushiki Kaisha

Kabushiki Kaisha Teisan Industries

Bakugo Fujito

Masakazu Sato

Keisuke Ban

Michio Konishi

Kousuke Kikuchi

A method for controlling implements by means of a hydraulic pressure. A hydraulic pressure is fed from an accumulator to a first hydraulic circuit, after the operating pressure has been once lowered any arbitrary operating pressure or variation of the operating pressure is detected in the course of restoration to an initial set pressure, and a second hydraulic circuit is triggered by a detection signal based on this detection. In a secondary pressurization casting process to which this hydraulic control method is applied, when molten metal within an injection sleeve is filled under pressure within a cavity of a casting mold by means of an injection ram driven by an operating pressure of an accumulator, the injection ram is made to advance initially at a low speed and subsequently at a high speed, and while the introduction of the accumulator operation pressure to a hydraulic cylinder for driving the injection ram is sustained, a pressurizing rod is actuated after completion of filling of molten metal to make a secondary pressurizing force exert upon the molten metal. The operating pressure of the accumulator continues to lower in the course of advancing of the injection ram, and it begins to restore after the filling of molten metal into the cavity of the mold has been completed. Any arbitrary operating pressure or variation of the operating pressure in the course of restoration of the operating pressure is detected, and a hydraulic circuit for driving the pressurizing rod is triggered on the basis of the detection signal to make the pressurizing rod advance into the cavity.

Hydraulic control method for implements

A secondary pressurization casting method, in which molten metal is injected into and filled in a cavity of a mold and then a secondary pressurizing force is exerted upon the filled molten metal by making a secondary pressurization pin advance within a through-hole formed in the wall of the mold. After commencement of filling of the molten metal in the cavity, the secondary pressurization pin placed at an initial set position is once retreated, and subsequently it is made to advance to pressurize the molten metal. A casting fin produced around the outer circumference of the tip end of the secondary pressurization pin during the period when the molten metal is being injected and filled, is integrated with the molten metal entered into the through-hole as a result of the retreat of the secondary pressurization pin, and subsequently it is pushed into the cavity by the secondary pressurization pin. Accordingly, it would never occur that the movement of the secondary pressurization pin is prevented by a wedge effect of a casting film.

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Utsunomiya, Japan

Bakugo Fujito