Optics: measuring and testing – By alignment in lateral direction – With light detector
Patent
1993-02-02
1998-02-10
Hantis, K.
Optics: measuring and testing
By alignment in lateral direction
With light detector
356138, 3561391, 33293, 25055937, 2502062, G01B 1100
Patent
active
057174911
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for ascertaining the spacing between a center line of curvature of a concave body surface, which is curved in the shape of a conical envelope and faces a free measurement space and a references axis extending substantially parallel thereto, in terms of magnitude and direction. The invention also relates to a method performable with the use of this method for the mutual alignment of the bearing surfaces of a turbine rotor and the wall surfaces of the central openings in the impeller wheel rims of the turbine and to a spacer member with a biaxial photo-electronic position detector for the performance of these methods.
For example during the assembly of turbines, the rims of the turbine impeller wheels must before the fastening of the guide vanes at them be so aligned very accurately in respect of the longitudinal axis of the turbine or the rotational axis of the rotor that its longitudinal axis, i.e. the center line of curvature of the wall, which surrounds the central rim opening and is as a rule cylindrical, is in alignment therewith. The longitudinal axis of the turbine representing the reference axis is given by the cylindrical bearing surfaces of the turbine rotor, with the center lines of curvature of which it co-incides. The end bearing surfaces present in the stator of the turbine for the impeller wheel rims extend in planes which are perpendicular to the longitudinal axis of the turbine and the impeller wheel rims must during the assembly at the turbine stator be brought through displacement in radial direction along the bearing surfaces into the desired position of alignment of the center line of curvature of their central opening with the reference axis and then in this state be fixed in the stator. For the adjustment, aids are used which enable a defined displacement in radial direction along the stator bearing surface. During the assembly, one so proceeds that the respective impeller wheel rim is initially brought into an estimated position as closely as possible to the position of alignment to be achieved, then the spacing is ascertained, which the center line of curvature still displays from the reference axis, in magnitude and direction, then a correction is undertaken by means of the adjusting aids according to the measurement result and this operation is in a given case repeated until the spacing has become zero or no longer exceeds a tolerable minimum value.
The present invention permits the ascertaining of the spacing of the center line of curvature of a concave body surface, which is curved in the manner of a conical shell, from a reference axis preset by a light beam of small diameter, in particular by a laser beam.
In a known method of this kind (DE periodical; Feinwerktechnik & Messtechnik, 89th Year, Issue 6, Sep. 1981, page 262), the position detector is rotated about an axis which is substantially parallel to the center line of curvature of the body surface, for which it is borne to be rotatable in a tripod which is settable onto the body surface and remains standing stationarily thereon during the measurement. Rigidly connected with the position detector is an arm, which extends radially to the axis of rotation, with an electronic sensor which rotates with the position detector and in that case moves by its point along the body surface in the direction of curvature thereof. The sensor produces an electrical signal which represents the spacing of the sensor tip from the rotational axis in the tripod. The tripod is so dimensioned that the axis of rotation for the sensor and the position detector is situated near to the center line of curvature of the body surface which can for example be the internal surface of a tube. The pinching of the tube and the position of the tube can be deduced from the difference between the sensor signal and the position detector signal, which signals are continuously detected during the rotation. The rotatable bearing of the position detector and of the electronic sensor at the tripod cause mechanical tolerances which en
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Busch Dieter
Foley David
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