Patent ID: 6641016
Filing Date: 2003-11-04
Classification: B23D,Y10T

Abstract:
A device for fracture-splitting a workpiece with several ring-shaped workpiece sections axially aligned in sequence, the device including at least one expander means which is axially insertable into a bore formed by each of said ring-shaped workpiece sections and comprising at least one expander element which can be expanded at a minimum of two expansion portions spaced away from each other in said axial direction characterized in that said expander means is provided with an expansion control means which is integrated in and cooperates with at least one said expander element, and said integrated expansion control means is selected from a group of integrated expansion control means comprising:an integrated expansion control means for controlling the variation in the position of at least two expansion portions, an integrated expansion control means for controlling the variation in the expansion extent of at least two expansion portions, an integrated expansion control means for controlling the variation in the expansion timing of at least two expansion portions, an integrated expansion control means for controlling the variation in the expansion sequence of at least two expansion portions, and an integrated expansion control means which comprises a combination of two or more of the aforementioned integrated expansion control means, said expander means comprising at least one expanding mandrel having two expanding mandrel halves, of which at least one includes expansion portions spaced away from each other in said axial direction and said expansion control means being arranged between said expanding mandrel halves, said expansion control means comprising: a plurality of lever elements spaced away from each other in said axial direction, each of which is arranged in an expansion portion between said two expanding mandrel halves, extending in an obtuse angle transversely to said axial direction and each cooperating with said at least one expander element, at least one actuating element oriented in said axial direction between said two expanding mandrel halves and which is connected to a first end portion of each of said lever elements and cooperates therewith, and at least one lever element counterbearing arranged in each expansion portion and actively connected thereto and which is connected to a second end portion of each of said lever elements and supports said second end portion.