1. Process for centerless grinding of shaft parts, wherein the shaft part ( 9) that is to be ground, having axial centering devices ( 11) on its front faces is ground in a rotatingly driven fashion in a space between a grinding wheel ( 1) and a regulating wheel ( 2), wherein the grinding wheel ( 1) and the regulating wheel each have a width that at least corresponds to the length of the shaft part ( 9) and wherein end regions ( 28) of the shaft part ( 9) are first ground at regions formed concentrically to centering devices, which is followed by the grinding of an intermediate region ( 29) lying between the end regions ( 28), then followed by a dimension and shape preserving grinding of the entire shaft part ( 9) to the finished size on the basis of grinding at the end regions ( 28) of the shaft part ( 9) lying on a support rail performed concentrically with the centering devices ( 11).

2. Process according to claim 1 wherein the end regions ( 28) of the shaft part ( 9) are ground between the grinding wheel and the regulating wheel by means of the grinding wheel ( 1) and the regulating wheel ( 2) having a larger diameter at each of the end regions ( 28) with a smaller gap ( 7) between the grinding wheel and the regulating wheel formed thereby in the end regions of the shaft part.

3. Process according to claim 2 wherein each end region ( 28) of the shaft part ( 9) has a region designed in the form of a collar ( 14) having an enlarged diameter and wherein the grinding wheel ( 1) and the regulating wheel ( 2) have diameters in the regions corresponding to the intermediate regions ( 29) of the shaft part ( 9) such that the collars ( 14) of the shaft part are ground first.

4. Process according to claim 1 wherein both the grinding wheel ( 1) and the regulating wheel ( 2) have a region that has a larger diameter in the intermediate region ( 29) lying in between the end regions ( 28) by means of which at least one support rail that is concentric to the centering devices ( 11) is ground on the shaft part ( 9).

5. Process according to claim 1 wherein at least one support rail ( 15) that is concentric to the centering devices ( 11) is ground by means of an intermediate region ( 29) having an enlarged diameter lying in between the end regions ( 28) of the shaft part ( 9) so as to decrease the gap ( 8) between the grinding wheel ( 1) and the regulating wheel ( 2) in this intermediate region ( 29).

6. Process according to claim 4 wherein the end regions ( 28) of the shaft part ( 9) are ground first, followed by grinding the at least one support rail ( 15) and then by grinding the shaft part ( 9) along its entire length.

7. Process according to claim 4 wherein the end regions ( 28) and the at least one support rail ( 15) are ground simultaneously.

8. Process according to claim 2 wherein the smaller gap ( 7) provided in the end regions ( 28) of the shaft part ( 9) has a magnitude such that grinding at the biggest radial offset existing in the region between the end regions ( 28) is, at the earliest, initiated after the grinding of the end regions ( 28) has been completed.

9. Process according to claim 3, wherein the collar ( 14) provided at the end regions ( 28) of the shaft part ( 9) has a diameter such that grinding at the biggest radial offset existing in the intermediate region ( 29) between the end regions ( 28) begins at the earliest after the grinding of the end regions ( 28) of the shaft part ( 9) has been completed.

10. Process according to claim 1, wherein the shaft parts are tubes for assembled camshafts.