Hydraulic Forging

Announeement is made that the Brener-Schumacher procesa of hydraulic forging-, so fully developed in German; n lntroduced In En by a Leed n, who have made a press that exerts a pressure of 700 tons. and can make long and slow strokee or short and qulcb ones, as desired; a large stenrn cylinder is uaed instead of a pumping engine, the piston of whlei is prolonged p.nd acts as a ram 8or exerting- hydraulic pressure on the forgtag lools throush the medi'jm of a Si hydraulic cylli riefly, there are two steam cylinders placed over tlie press to lift the forging crossh'ead, by which the uppirried, and, when it is deïiied to vi:rk in the ordinary way with heavy pressure, th admission and exhauFt of ?team in these lifting cylinders ir, eontrolled by the same lever whieh regula tea the admission and the exhausting of the steam in the large driving cyllnder; but for quiek working, direct -■=; n ï uninterrupted communication Is entabltshed by means of a separate cock botween thesi lifting oyllnders and the boller. In this way there is then always the full bollet pressure benwuh t' e e; Milder, tt-ndIng to keep the cros-shonc! and uppei tooi at the top of the Btrcke, bv.t the nain steam cylinder, w!ich puts or the forg-ing pressure - through the hydraulic mechanism - is of so much greater area than the comblned area of the two small eylindrrs that the crosshead is pressed down with considerable forcé, although, of course, With less force than if the two Uiting tylinders were exhausting in the uu; way.