Hydraulically operated sheet metal piercing tool - has intermediate chamber between pressure multiplier head and double acting piercing cylinder

摘要

A piercing tool for metal sheets, particularly for the motor vehicle industry is hydraulically operated, and to improve its manoeuvrability is formed with a body in the shape of a right angle. The working head (4) operates as a pressure multiplier, and is connected to the piercing cylinder (8) by a chamber (7A) at the junction point between them. This cylinder houses a double acting piston (19) inside another chamber (7B) permanently fed by fluid at a low or medium pressure. Over this piston (19) slides a sleeve (25) acting as a hydraulic sealing member. Its diameter is less than the inside diameter of the first chamber (7A). A spring loaded valve (17) controls the fluid supply to the pressure multiplier.