PISTON UNIT OF PRESSURE DIE CASTING MACHINE AND METHOD FOR COOLING IT Russian patent published in 2002 - IPC

FIELD: foundry, namely pressure die casting equipment. SUBSTANCE: piston unit includes mutually joined piston and rod with lengthwise duct for pipeline. Sealing member is placed in rear end of pipeline; hollow stem is arranged in front end of pipeline. Hollow stem is joined with rod and it has disc in its end. Disc is arranged without gap between ends of piston and rod having lateral ports, one port is open to lengthwise duct of rod, other port - to its bottom. Rod also includes several lateral ports open to lengthwise turnings of its joining surface, arranged between windows of disc and open to cavity of stem. Sealing member is placed in outer annular groove of rod for sealing zone of piston cooling. Stem is non-detachably connected with pipeline; windows of disc are arranged crosswise. Rod for piston with diameter no more than 50 mm has several lateral ports in different cross sections; rod for piston with diameter more than 50 mm has ports arranged in one cross section. Cooling agent is supplied through outer ducts of rod from rear end of piston to its leading end. Heated cooling agent is discharged through inner duct of rod in opposite direction. EFFECT: enhanced operational reliability, simplified process for making unit. 2 cl, 1 dwg