METHOD FOR MANUFACTURING AT LEAST ONE INTERNAL GROOVE OF SENSIBLY AXIAL DIRECTION IN A TUBULAR CYLINDER

摘要

The object of the invention is to provide a method for the manufacture of the cylindrical member 1 of a piston and piston assembly in which the working chambers, which are delimited in the radius of the cylinder on both sides of the piston, are CONNECTED TO THEM THROUGH AN INTERCONNECTION GAUGE 4B. THIS METHOD CONSISTS OF PLACING A TUBULAR ORGAN 1 IN A SUPPORT TUBE 6 WITH A SUPPORT FACE HAVING A METAL RECEPTION GAUGE 7A, 7B, AND MAKING THE GAUGE 4B USING A ROLL 8 EXERCISING A RADIAL PRESSURE ON THE TUBE 1 WHILE MOVING SIMULTANEOUSLY ALONG THE AXIS OF THIS CYLINDER. THIS GALLET 3 IS PROVIDED, FOR THE REALIZATION OF THE THROAT, OF A RADIALLY HIGHLY ANNULAR ELEVATION OF RADIATION 9 AND OF RETAINING FACES 14A, 14B LIMITING ITS PENETRATION IN THE TUBE 1. / P P ON SO OBTAINS GORGES OF VERY ACCURATE DIMENSIONS AND THE CIRCULAR SHAPE OF THE TUBE IS MAINTAINED. THE TRANSITION ZONES BETWEEN THE INTERCONNECTION GORGE AND THE ADJACENT REGIONS OF THE INTERNAL SIDE OF THE TUBE ARE COMPACT AND EBARBURY FREE. / P