PISTON MACHINE FOR PRESSURE CASTING Russian patent published in 2016 - IPC B22D17/08 B22D17/04 B22D17/20 

FIELD: machine building; technological processes.

SUBSTANCE: present invention relates to a piston for a die-casting machine, in particular with a cold chamber, comprises a stem which extends from a proximal end to a distal end along a piston axis and a piston head which extends from the distal end of the stem and which is provided with at least one sealing ring housed in a respective ring seat made in a lateral wall of said head, the said sealing ring being interrupted longitudinally by a longitudinal split which permits the radial expansion of the sealing ring. A lubrication circuit suitable for favouring the sliding of the piston comprises first lubrication ducts made in the stem and ending at the distal end of the said stem, and second ducts made in the piston head, fluidically communicating with the first duct and coming out in the ring seat under the sealing ring, said second duct being covered by the sealing ring, so that the lubricant comes out of the piston head through the interstices between the sealing ring and the piston head and/or through said longitudinal split.

EFFECT: such design of plunger provides better distribution of lubricant, encouraging the sliding of the piston in the container of the press for the die-casting machine.

19 cl, 27 dwg