Influence of eccentricity on movements of orbital head with double eccentric structure in orbital forging

An orbital head of orbital forging press with double eccentric sleeve has four types of movement, but most workpieces are formed by circular movement. The motion equation is established according to the structure and the movement principle of orbital head. Then find that the rotational speed of inner and outer eccentric sleeves simply affects the rotation period of orbital head in circle and straight line movements, and not only affects the rotation period but also the movement shape in spiral and rose curve movements. The eccentricity of inner and outer eccentric sleeves can change the shape and size of the movement, adjust the distance from the movement to the center point, and change straight line movement into ellipse, spiral and rose curve movements do not cross through the center. It can solve the problem that straight line, spiral and rose curve movements pass the center, orbital angle is zero and the forming force increases sharply, achieve the continuous local deformation of workpiece during the forming process. (C) 2014 Published by Elsevier Ltd.