THE ELASTIC-DYNAMIC MODELING OF A PRESS FEED MECHANISM

The development of a mathematical model, describing the elastic-dynami c response of an industrial lever type roll feed mechanism, is present ed. This device, which is used in all manner of powerpress work, consi sts of an RSSR linkage with a bent coupler, an indexing-type sprag clu tch, a set of feed and pressure rollers, which move a metal strip into a die, and a disc brake. Its intermittent motion has been characteriz ed by four motion regimes. While the spatial coupler link is considere d to have distributed mass and electricity, the clutch model neglects the masses of the sprags and represents the total clutch elasticity by way of a single, nonlinear, massless torsional spring. The derivation of the equations of motion of the coupler and the feed-roller driven metal strip, for the various regimes, is based on Hamilton's principle . The subsequent application of the method of Kantorovich, wherein the space portions of the coupler motion are expressed in terms of its in and out-of-plane free-vibration modes, makes it possible to obtain co upled ordinary differential equations for the feed-roller motion, as w ell as the time portions of the coupler deflections.