GB428350A - Improvements in or relating to hydraulic metal tube extrusion presses - Google Patents

Abstract

428,350. Squirting. SCHLOEMANN AKT.-GES., 13, Steinstrasse, D³sseldorf, Germany. Dec. 11, 1934, No. 35615. Convention date, Dec. 11, 1933. [Class 83 (iv)] The piercing stroke of a mandrel passing through the ram of an extrusion press is limited by stops on the press frame engaged by the bottom ends of the actuating rams for the piercing mandrel. A press comprises an extrusion plunger 1 through which passes centrally a piercing mandrel 2, operated by hydraulic pistons 5 and retracted by pistons 51. Stops 9 are adjustably screwed into the lower hollow end of extensions of the pistons 5 and engage fixed abutments 10 to limit the downward stroke of the piercing mandrel. The stops 10 are carried in cross-pieces 11 supported by rods 12 from cylinders 13, and may be removed to allow the pistons to pass freely downwards to enable a mandrel extending through and beyond the die 6 to be employed. In a modification the pieces 10 are carried in projections integral with the press frame. In a further modification adjustable stops are screwed into the pieces 10 and are engaged by the non-adjustable ends of the pistons 5. Packing strips may be used instead of the adjustable stops.