Process and device for the ultrasonic examination of disk elements of unknown contours shrunk onto shafts

PCT No. PCT/DE96/01733 Sec. 371 Date Jun. 30, 1998 Sec. 102(e) Date Jun. 30, 1998 PCT Filed Sep. 13, 1996 PCT Pub. No. WO97/13144 PCT Pub. Date Apr. 10, 1997Method and apparatus for ultrasound testing of disc bodies which are shrunk onto shafts and have an unknown contour. The invention relates to a method and an apparatus for ultrasound testing of a disc body (2), which is shrunk onto a shaft (1), in the region of the shrink seating (3) and of the adjacent shrinkage influence zone, the disc body (2) having side pieces (4, 5) which taper radially outwards from the shrink seating in cross-section. The contour of the disc body (2) is scanned and its geometry is derived in this way. A geometric reflection surface is determined. Test parameters and test positions are determined from the disc body geometry in accordance with a predetermined test technique, and ultrasound test heads (9, 10) are coupled, using the determined test parameters, to the side pieces (4, 5) in order to cover the determined test paths. The associated apparatus has a geometry identification device which detects the geometry of the disc body (2) before the actual test procedure. The invention makes it possible to test turbine discs in a time-saving manner, without it being necessary to known their geometry before the test.