Vibration-Free Machining of Pilgrim Mandrels

Abstract

A support collar plate for vibration-free holding of workpiece, i.e., pilgrim mandrel, clamped at both ends and to be processed between its ends by means of a grinding wheel, comprised of a base, arranged fixed in place in respect to the workpiece, and a clamp, which extends around the workpiece on at least two oppositely located sides. The workpiece can be clamped by a clamping force, wherein the clamp extends around the workpiece so that it is possible to perform processing in the area of the clamp on the side facing the grinding wheel, and wherein the clamp is floatingly seated in at least one direction perpendicularly in respect to a longitudinal axis of the workpiece, so that the clamp is self-centering in respect to the workpiece. By means of the floatingly seated clamp, the workpiece is maintained independent of exterior forces which change the spatial position of the workpiece.

1 . A support collar plate for the vibration-free holding of a workpiece, in particular a pilgrim mandrel, which is clamped at both ends and is to be processed between its ends by means of a grinding wheel, characterized in that
 the support collar plate is comprised of a base, arranged fixed in place with respect to the workpiece, and a clamp, which extends around the workpiece on at least two oppositely located sides,
 in which the workpiece can be clamped by a clamping force, 
 wherein the clamp extends around the workpiece in such a way that it is possible to perform processing in the area of the clamp on the side facing the grinding wheel, and 
 wherein the clamp is floatingly seated in at least one direction perpendicularly with respect to a longitudinal axis of the workpiece so that the clamp is self-centering with respect to the workpiece 
   and, by means of the floatingly seated clamp, the workpiece is maintained independent of exterior forces which change the spatial position of the workpiece, and movements of the workpiece perpendicularly with respect to its longitudinal axis are damped by means of the mass inertia of the clamp.   
     
     
         2 . The support collar plate in accordance with  claim 1 , characterized in that weights are arranged on the clamp for matching the mass inertia of the clamp to predeterminable damping. 
     
     
         3 . The support collar plate in accordance with  claim 2 , characterized in that the weights are made of a vibration-damping material. 
     
     
         4 . The support collar plate in accordance with  claim 2 , characterized in that the weights are simultaneously used for producing a clamping force for maintaining the workpiece in the clamp. 
     
     
         5 . The support collar plate in accordance with  claim 3 , characterized in that the weights are simultaneously used for producing a clamping force for maintaining the workpiece in the clamp. 
     
     
         6 . The support collar plate in accordance with  claim 1 , characterized in that the clamp is provided with exchangeable inserts in the area of the contact points between the workpiece and the clamp, through whose exchange the adaptation of the clamp to different workpieces can be performed, and/or by means of whose exchange a different number of contact points can be produced between the workpiece and the clamp. 
     
     
         7 . The support collar plate in accordance with  claim 1 , characterized in that the base is magnetic. 
     
     
         8 . The support collar plate in accordance with  claim 1 , characterized in that the clamp is height-adjustable in relation to the base. 
     
     
         9 . The support collar plate in accordance with  claim 1 , characterized in that the support collar plate has means for the active vibration damping of vibrations being created by the contact between the grinding wheel and the workpiece. 
     
     
         10 . The support collar plate in accordance with  claim 9 , characterized in that the means for active vibration damping preferably include at least one piezo element, by means of which a mechanical reaction in the form of pressure or traction, into a pre-selectable direction acting counter to a deflection of the workpiece, takes place by applying an external voltage. 
     
     
         11 . The support collar plate in accordance with  claim 9 , characterized in that the support collar plate has means for detecting vibrations. 
     
     
         12 . The support collar plate in accordance with  claim 10 , characterized in that the support collar plate has means for detecting vibrations. 
     
     
         13 . The support collar plate in accordance with  claim 1 , characterized in that the floating seating of the clamp in at least one direction perpendicularly in relation to the position of the longitudinal axis of the workpiece includes a hinge which is arranged between the base and the clamp and has at least one pivot shaft extending parallel to the longitudinal axis of the workpiece. 
     
     
         14 . The support collar plate in accordance with  claim 1 , characterized in that the clamp can be pivoted from an initial position in regard to the base, in which the clamp cannot be brought into contact with the workpiece, into an engagement position, in which the clamp can be brought into contact with the workpiece. 
     
     
         15 . The support collar plate in accordance with  claim 1 , characterized in that cooling medium nozzles are arranged in the area between the contact points between the clamp and the workpiece.