Abstract: The machine includes an upper secondary pressure cylinder to give an added pressure onto a backing plate to which an upper die half is attached, and a lower secondary pressure cylinder connected to a main pressure cylinder, which moves a plunger rod to squeeze molten metal into the casting cavity, in a lower section to give an added pressure onto the lower die half through the plunger rod of the main pressure cylinder.

Abstract: Controlled-pressure casting of molten metals using a die with an extractable punch and a fixed die, includes positioning and stopping the punch within the die so as to define a casting cavity with a volume greater that that of the part to be obtained. A metered amount of liquid metal is then poured into the casting cavity through a duct which leads into the cavity, and the punch is moved to close inside the die so as to create a pressure suitable for distributing the metal throughout the cavity. A high-pressure compression is then exerted on the metal contained in the cavity and, maintained until the molten metal solidifies, the punch is partially removed from the die, with separation of the punch from the formed part, before finally removing the punch from the die and extracting the part from the die.

Abstract: A manufacturing method for a defect-free cast product comprises the steps of forming a cavity surrounded by a plurality of dies, charging molten conductive material into the cavity, and applying pressure to the conductive material by pressure means. In the method, additional pressure is selectively applied to the portion of the conductive material which may suffer shrinkage cavities due to delay in solidification, by utilizing the pressure applied by the pressure means and by relatively moving a portion of the dies with respect to the conductive material when the conductive material solidifies and shrinks, whereby shrinkage cavities are prevented. Accordingly, with a cast rotor core obtained by this method, it is possible to prevent shrinkage cavities from occurring in the conductive material and it is also possible to improve the efficiency and torque characteristics of the motor, thereby achieving reductions in the size and weight of the motor.

Abstract: A pressing mechanism for a casting apparatus comprises: a mold including a cavity for solidifying molten metal therein and a biscuit portion and a runner portion for introducing the molten metal therethrough into the cavity; a unit for supplying molten metal into the cavity, the unit having a sleeve to store molten metal and capable of communicating to the runner and a plunger tip in the sleeve, the plunger tip being capble of protruding from the sleeve so that the molten metal is fed into the mold after the sleeve is communicated to the biscuit portion, the tip being capable of protruding into the biscuit portion; a feeding rod disposed in the mold for freely protruding into the runner; and a unit for reciprocating the feeding rod. The tip approaches to a ceiling surface of the biscuit to a range of 0.5 to 5 mm. The tip may have a projection at its top face.

Abstract: 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.

Abstract: 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.

Abstract: A die casting apparatus comprising a secondary pressing cylinder mounted on one mold, a sequence valve, a control valve and a reducing valve, the valves being interposed between a switching valve and the secondary pressing cylinder. Operating timing of the secondary pressing cylinder is changed by the sequence valve, the moving speed of the pressing plunger is adjusted by the flow control valve, and the pressing force of the pressing plunger is varied by the reducing valve. The operation of secondary pressing is adjusted by the sequence valve and the flow control valve.

Abstract: This invention relates to a die casting machine in which high pressure is applied to molten metal to inject and fill the molten metal all over the mold before the molten metal is solidified to continuously mold molded articles (products), which have a beautiful casting surface and a high dimensional precision, every cycle of the machine. One or both of a fixed mold or a movable mold, which serves as a molding mold, and a core incorporated into one or both the molds are formed of high strength ceramics, and in addition, a movable hob for pressurizing molten metal injected and filled into both the fixed and movable molds is formed of high strength ceramics thereby providing a mold construction which is excellent in mechanical characteristics such as strength, hardness, breaking toughness and the like and having durability and pressure resistance enough to withstand high temperature thermal shock and high pressure, and being capable of easily controlling the temperature distribution within the mold.

Abstract: The squeeze-out casting machine comprises a base-plate for reciprocation therealong, half-molds and sealing jaws with pour-in ports adapted to overlap closingly as the half-molds are being brought together. The baseplate has rigidly secured theroen a centering pin supporting a frame with a core unit. The core unit defines jointly with the base plate, the sealing jaws and the portions of the half-molds adjoining the baseplate and a metal-receiving chamber. There is also an arrangement for supplying an inert gas communicating with the metal-receiving chamber.

Abstract: A die assembly for squeeze casting of metals wherein a tubular reinforcing die is set on a base, a forming die consists of split dies is inserted in internal contact with the reinforcing die and the surface in internal contact with the reinforcing die is tapered so as to be narrower downward so that, in case a downward force is applied by a sealing die to a molten metal poured into the forming die, the split dies may be pushed in downward along the tapered surface to prevent the molten metal from spitting out.