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For rolling a workpiece with a rolling tool with several rolling elements arranged in hydrostatic bearings, during rolling, only some of the rolling elements engage the workpiece, while the rolling elements not engaging the workpiece essentially seal off the hydrostatic bearing. In such a rolling to

For rolling a workpiece with a rolling tool with several rolling elements arranged in hydrostatic bearings, during rolling, only some of the rolling elements engage the workpiece, while the rolling elements not engaging the workpiece essentially seal off the hydrostatic bearing. In such a rolling tool, the rolling elements are arranged so as to be distributed over an area, and each of the hydrostatic bearings includes a circumferential seal in the region of the rolling elements.

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1. A method for rolling a workpiece comprising the steps of: applying a rolling tool to a workpiece, the tool provided with a plurality of rolling elements held in hydrostatic bearings, wherein during a rolling action, some of the rolling elements are in an engagement position with the workpiece occ

1. A method for rolling a workpiece comprising the steps of: applying a rolling tool to a workpiece, the tool provided with a plurality of rolling elements held in hydrostatic bearings, wherein during a rolling action, some of the rolling elements are in an engagement position with the workpiece occupying a sealing gap, while other rolling elements not engaging the workpiece are occupying a valve seat thereby sealing off the hydrostatic bearing by a gapless contact, and wherein in an operative condition the rolling elements occupying the sealing gap are engaging the workpiece whereby the valve seat opens and fluid flows through the sealing gap thereby reactivating the hydrostatic bearing and to effectively control flow of the hydrostatic medium of the bearing. 2. The method according to claim 1, wherein the rolling tool is moved in a linear or rotational manner. 3. The method according to claim 1, wherein with linear movement of the rolling tool in one direction, more than the same position of the workpiece is treated. 4. A bearing arrangement comprisinga rolling tool body with rolling elements arranged in hydrostatic bearings for acting upon a work piece;each of the hydrostatic bearing includes a borehole matched to the rolling element and to form a sealing gap;a valve seat for holding the rolling element in the tool body; wherein in a non-operative condition, the rolling element assumes a position whereby the rolling element is held in the valve seat of the tool body and protrudes beyond the valve seat by a dimension for sealing off the hydrostatic bearing, and wherein in an operative condition the rolling element occupies the sealing gap thereby reducing the dimension and the rolling element is engaged with the workpiece whereby the valve seat is opened and fluid can run through the sealing gap for reactivating the hydrostatic bearing. 5. A rolling tool of claim 4, wherein the rolling elements are arranged so as to be distributed over an area. 6. The rolling tool according to claim 5, wherein the area is curved at least in one direction. 7. The rolling tool according to claim 5, wherein the area is kinked in at least one direction. 8. The rolling tool according to claim 5, wherein rolling elements which are arranged one behind the other in the direction of treatment, are arranged so as to be offset by a length b. 9. An arrangement of a rolling tool comprising several rolling elements arranged in hydrostatic bearings and a workpiece, each of the hydrostatic bearing provided with a sealing gap and a valve seat, wherein the rolling elements protrude beyond the hydrostatic bearing according to a distance between the hydrostatic bearing and the workpiece, and wherein the distance varies in dependence on the rolling elements acting upon the workpiece such that when distance is reduced the rolling element is in operative condition whereby the valve seat is opened and hydrostatic fluid can run through the sealing gap for reactivating the hydrostatic bearing. 10. A method for rolling a workpiece, comprising the steps of:providing a rolling tool having a plurality of rolling elements supported by a plurality of hydrostatic bearings, whereby the hydrostatic bearings and the rolling elements are placed into one-to-one correspondence; and rolling a workpiece in a manner that at any time during a rolling operation a first number of the rolling elements of the rolling tool engage the workpiece to implement the rolling operation through a radial movement of the rolling element while a second number of non-engaging rolling elements of the rolling tool substantially seal the pertaining hydrostatic bearings of the rolling tool, and wherein in an operative condition the rolling element occupying the sealing gap is engaging the workpiece whereby the valve seat opens and fluid flows through the sealing gap thereby reactivating the hydrostatic bearing and to effectively control flow of the hydrostatic medium of the bearing. 11. The method of cla im 10, wherein the rolling tool is moved during the rolling step in a linear or rotational manner. 12. The method of claim 10, wherein the rolling tool is moved during the rolling step in a linear direction to repeatedly roll the workpiece. 13. The rolling tool of claim 10, and further comprising a plurality of circumferential seals, each of the seals being disposed in the hydrostatic bearings in a region of the rolling elements, whereby the seals and the hydrostatic bearings are placed into one-to-one correspondence. 14. The rolling tool of claim 13, wherein the hydrostatic bearings have a sealing gap dimensioned to act as hydraulic throttle. 15. A rolling tool, comprising a tool body having a plurality of pockets to form hydrostatic bearings; and plural rolling elements supported by the hydrostatic bearings and provided in spaced-apart relationship to cover an area, wherein each of the hydrostatic bearings includes a borehole matched to the rolling element to form a sealing gap, and wherein in a non-operative condition, the rolling element assumes a sealing function, whereby the rolling element is held in a valve seat of the tool body and protrudes beyond the valve seat by a dimension, and wherein in an operative condition the rolling element aligns with the sealing gap. 16. The rolling tool of claim 15, wherein the area is curved at least in one direction. 17. The rolling tool of claim 15, wherein the area is kinked in at least one direction. 18. The rolling tool of claim 15, wherein the rolling elements are arranged on the tool body in rows, with sequential rolling elements in movement direction of the tool body disposed in offset relationship. 19. An arrangement, comprising a rolling tool having plural hydrostatic bearings for supporting a corresponding number of rolling elements; and a workpiece, wherein a first number of the rolling elements protrude beyond the hydrostatic bearings commensurate with a first distance between the hydrostatic bearings and the workpiece, while a second number of rolling elements protrude beyond the hydrostatic bearings by a second distance which is greater than the first distance, wherein the rolling elements that protrude beyond the hydrostatic bearing commensurate with a first distance occupy a sealing gap when in an operative condition whereby the valve seat is opened and fluid can run through the sealing gap for reactivating the hydrostatic bearing.