Abstract: A method of and an apparatus for high pressure die casting are disclosed. The method uses a die casting apparatus which comprises a group of three plungers for casting metal. The two of which, injection plunger 1 and assistant plunger 3, are used to reduce metal loading time and reduce entrapped gases in die casting during a fast injection stage. By moving into injection sleeve 2, the assistant plunger separates the mold cavity 11 from the space defined by assistant plunger 3, injection sleeve 2, and injection plunger 1. The flow power device for moving said assistant plunger 3 is mounded on a back plate 8. A third plunger, the intensification plunger 12, is used to squeeze casting as soon as the injection plunger advances to a position in which the runner is separated from the closed space.

Abstract: A die-casting device at least includes a housing having a seat, a lower mold mechanism at the seat, an oil-pressured injection mechanism joined with a lower section of the lower mold mechanism, and a corresponding upper mold mechanism disposed at an upper section of the housing and driven by an oil-pressured mechanism for up-and-down movements; wherein, the lower mold mechanism is devised as a structure with an outwardly inclined angle. Thus, when adding a metal liquid to the die-casting device, the lower mold mechanism is first inclined outward, such that when the metal liquid is flowed in to a material reservoir of an injection mechanism, a flow speed of the metal liquid is reduced to avoid formation of the bubbles, thereby preventing finished die-casting products from containing bubbles and thus elevating product quality.

Abstract: The present invention is related to a rotary cooling station to be used in conjunction with a high output injection molding machine and a robot having a take-out plate. More particularly, the present invention teaches a high speed robot that transfers warm preforms onto a separate rotary cooling station where they are retained and internally cooled by specialized cores. The preforms may also be simultaneously cooled from the outside to speed up the cooling rate and thus avoid the formation of crystallinity zones. Solutions for the retention and ejection of the cooled preforms are described. The rotary cooling station of the present invention may be used to cool molded articles made of a single material or multiple materials.

Abstract: A mixer method and apparatus for use generally in injection molding machines is provided. The apparatus and method is generally comprised of a mixer insert that retains a mixing element that is sealingly inserted in the injection molding machine, for example a hot runner manifold. The mixing element reduces the melt imbalances in a flowing melt stream for the formation of improved molded parts.

Abstract: A moulding device having a moulding block with a moulding cavity formed therein. A chamber is connected to the cavity and has a mouth where the chamber is connected to the moulding cavity. A closing member is provided between the chamber and the cavity which is moveable from a first position in which the mouth of the chamber is sealed to allow the chamber to be charged with a molten substance while the piston is retracted to a second position which forms a narrow orifice such that a fine spray or jet or film of molten substance is forced at a high velocity through the narrow orifice to form a fine grain coating on the inner surface of the moulding cavity. The closing member can then be further retracted to provide for a second phase of molten substance injection which is carried out until the moulding cavity is full.

Abstract: Horizontally movable mold halves respectively journal different plungers for movement within coaxial bores extending through the closed mold halves. With the mold closed, and one plunger extending through the mold to one side, a metered compartment is formed between the two carefully positioned plungers. A charge of molten metal, or the like, is transferred from a reservoir into the compartment and moved into the mold cavity by moving the two plungers in unison to a position at the die surface of the respective mold halves. After hardening, the mold halves are separated and one plunger ejects the molded article from the mold. The plungers and mold halves are moved by hydraulic cylinder rams into a sequence of fixed positions for different steps of a programmable molding cycle. Sensing switches provide feedback for establishing the plunger positions at various cycle steps.

Abstract: A liquid metal (49) poured into a filling chamber (20) is influenced in this chamber by a lower piston (43) and an upper piston (18), which are mounted on a lower machine table (5) and an upper machine table (10) respectively, which tables (5 and 10 respectively) support a lower mold part (24) and an upper mold part (22) respectively. The filling chamber (20) is disposed in or at the lower mold part (24) and receives, as regards the poured-in amount of metal, the lower piston (43), which is adjustable as to its elevational level and can be adjusted to make the amount of metal reach a level somewhat below the mold cavity (51) between the mold parts (22, 24). The lower piston (43) has a larger diameter than the upper piston (18), which, in connection with the filling of the metal (41), is designed to be lowered to a central position in a guiding and feeding sleeve (19) in the upper mold part (22) and is retained in this position by an adjustable holding force.

Abstract: A melting and casting plant for operation at least under a vacuum and having a vacuum chamber. A wall of the vacuum chamber of the plant is angularly fashioned and is composed of a stationary part and of a swivellable part, the swivellable part being hinged to the stationary part. A door (ingot mold door) is provided in the swivellable part. The shape of the chamber wall and a linking axis of the swivellable part are fashioned or arranged, such that, when the chamber is opened, articles situated in the interior of the chamber are readily accessible. In comparison to the prior art, improved operations of the system, particularly regarding the chamber, is possible.

Abstract: A two-piece shot sleeve for use with a die casting machine including first and second cylindrical sleeve sections being removably axially secured together, each open at both ends and including an interior passage for the flow of molten metal, the second sleeve section also including a pour hole for receiving molten metal into the interior passage. The invention also relates to a die casting machine including a die, a source of molten liquid for casting, a two-piece shot sleeve including a die end section and a pour end section, a plunger disposed within shot sleeve for forcing molten liquid through the shot sleeve into the die and, a ram for moving plunger axially within shot sleeve, wherein the pour end section of the two-piece shot sleeve is removable from the machine without removing the die end section.

Abstract: A method and apparatus for making small lead objects such as bullets. Lead is melted and while in a molten state is pumped through a metering device that regulates the amount fed into a die where it solidifies. Force is immediately applied to the still-soft lead to form the hard bullet.

Abstract: In the vertical die casting device of this invention, the molten metal is poured from the gate into the sleeve with the cavity gate closed by the counter tip; and when filling the cavity with the molten metal, the plunger tip and the counter tip are lowered at the same speed so as not to pressurize the molten metal held between the tips to prevent the temperature reduction of molten metal so that when the counter tip opens the cavity gate with the plunger tip continuing to move down the molten metal can smoothly flow into the cavity.

Abstract: A method for injecting molten metal in a vertical diecasting machine. In order to efficiently produce high quality castings, a molten metal is injected into a mold cavity with the upper part of the mold cavity communicating with the atmosphere, the mold cavity is occluded before the completion of the injection, and then the molten metal is pressurized to suppress the trapping of air or gases in the casting.

Abstract: A method of casting including the steps of closing gates with a counter tip after lower and upper molds heated to a predetermined temperature have been clamped, pouring melt into a sleeve in which a plunger tip is lifted a predetermined distance, lowering the plunger tip while displacing the counter tip to a predetermined position to open the gates, which are formed such that the ratio of the volume of products to the cross-sectional area of the gates is 20-40 (i.e. the volume of products/(CM.sup.3) cross-sectional area of gates (CM.sup.2)=20-40), to allow the melt to flow into cavities via the gates by the force of gravity alone with the plunger tip reaching the upper surface of the melt the moment a percentage of the melt placed in the cavities has reached a value between 30 and 70%, and pressure-filling the cavities with the melt by the plunger tip with the melt passing through the gates at 0.4-0.8 m/sec.

Abstract: A modified die casting process and machine utilizes a shaped and contained charge of molten metal which is formed and moved proximate the gate runner while the die halves are open. The charge is formed between the shot piston and an ejector side plunger which includes a slave driver rod projecting to engage the shot piston. By confining and compacting the charge, a charge more homogeneous and of uniform temperature is provided. When the die halves close, the shot piston further advances moving the plunger against a stop, retracting the slave driver rod and filling the cavity at the desired flow rate. The cavity is provided with one or more impact absorbing devices positioned in recesses on the parting plane of the die.

Abstract: A method of charging molten metal into a vertical die casting machine, wherein molten metal is introduced into a lower sleeve in which a lower plunger is slidably received, to store therein a mass of molten metal having a surface level not higher than the bottom of a molten metal inlet to a mold cavity. Next, an upper plunger is lowered to a predetermined position, raising the lower plunger to urge the molten metal upwardly and move it into the mold cavity. The upper plunger can then be moved to apply pressure to the molten metal. The method ensures smooth charging of molten metal and casting of a product free of casting defects.

Abstract: A modified die casting process and machine utilizes a shaped and contained charge of molten metal which is formed and moved proximate the gate runner while the die halves are open. The charge is formed between the shot piston and an ejector side plunger which includes a slave driver rod projecting to engage the shot piston. By confining and compacting the charge, a charge more homogeneous and of uniform temperature is provided. When the die halves close, the shot piston further advances moving the plunger against a stop, retracting the slave driver rod and filling the cavity at the desired flow rate. The cavity is provided with one or more impact absorbing devices positioned in recesses on the parting plane of the die.