Abstract: A method for cleaning and lubricating an injection sleeve and plunger tip during a fill and injection cycle in a cold chamber die casting machine, in which the plunger tip has an annular generally arcuate recess, lubricating nozzles, lubricating conduits, and scrap exhaust conduits. Pressurized air is released into the recess during the injection cycle and debris is exhausted through the scrap exhaust conduits. Upon completion of the injection cycle, the release of pressurized air into the recess is terminated. A mixture of pressurized air and lubricant is released through the recess onto the injection sleeve during the withdrawal cycle. Upon completion of the withdrawal cycle, release of the mixture of pressurized air and lubricant into the recess is terminated.

Abstract: An injection piston, which has a plunger tip, a plunger piston ring, and a cap and bolts, attaches to an injection rod for use in an injection sleeve of a cold chamber die casting machine. The plunger tip includes a lubricating chamber, lubricating and air conduits, lubricating and air nozzles, an annular scraper ring and scrap exhaust conduits; and has a diameter which is less than the inner diameter of the injection sleeve. The plunger piston ring has an outer diameter corresponding to the inner diameter of the injection sleeve; and is secured to the plunger tip by a cap and fasteners.

Abstract: A top filling injection unit for a cold chamber die casting machine, the cold chamber die casting machine having a fixed platen, a moving platen, a fixed die half and a moving die half, the fixed die half is mounted on the fixed platen and the moving die half is mounted on the moving platen, a part line on which the moving die half and fixed die half meet, the top filling injection unit comprised of an open upwardly inclined injection sleeve, an injection plunger, an injection plunger piston, an injection cylinder and an injection piston, an aperture in the fixed die half defining an opening, the injection sleeve is secured in the opening in the fixed die half, with the top of the injection sleeve proximate the part line, the injection plunger having a retractable filling position and an upper injection position, the injection plunger is lowered to a selected filling position, the upper injection position of the injection plunger being proximate the part line.

Abstract: An injection unit for a die casting machine having a fixed platen with a fixed die and a moving platen with a moving die, the moving die and the fixed die meeting on a part line for casting, the fixed die having an injection nozzle seat, and an inclined opening defining an inclined passage within the die from the injection nozzle seat to the part line, the injection unit comprising a base plate supporting a minipot, injection device, an injection nozzle support and an injection nozzle, a mechanism to move said base plate towards and away from said fixed die to seat or unseat the injection nozzle in the injection nozzle seat.