PISTON UNIT OF INJECTION MOLDING MACHINE Russian patent published in 2019 - IPC B22D17/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgical production and can be used in process equipment of injection molding machines. Piston assembly comprises hollow piston with peripheral annular cavity at front end filled with solid heat insulating material closed with truncated ring. Piston is fixed on front part of rod, having longitudinal cavity and transverse windows for coolant. In the longitudinal cavity of the rod there is a tube with a side gap between them. In the bottom of the piston cavity there is a disk with a shank end and located in the piston cavity with a side gap between them and with the back end resting in the front end of the rod. Disk and shank have common dead cavity, in which transverse windows of disc are open. Front end of the tube is connected to the shank of the disk. Side clearance between stock and tube by means of crosswise openings of rod is connected with its annular groove, which is open by means of longitudinal grooves made on surface of hollow piston in place of its connection with rod, into side gap between hollow piston and disc.

EFFECT: higher reliability of piston assembly.

1 cl, 1 dwg