| 摘要 |
The invention relates to a method for measuring the sphericity or for mea suring the shape deviation of spherical profiles in rolling trains that disp lace in the longitudinal direction thereof. According to the invention, at l east three shadow edges that are adjacent to the spherical profile that is t o be measured, that surrounds said spherical profile and that forms a polygo n are produced and measured in a known manner, with the aid of a measuring d evice having at least two laser scanners that respectively comprise a light- sensitive sensor and a laser, and the corresponding tangents are calculated from said result. Said method is characterised in that a) prior to measurmen t, a centre (Z0) in the measuring field of the measuring device is calibrate d and determined provided that said type of centre (Z0) has not already dete rmined, b) perpendiculars (r1, - r6') from the centre (Z0) to the tangents ( T1, bis T6' ) and also the distance from the centre (Z0) to the tangents (T1 - T6' ) is calculated, c) the corner points (A - K) of the polygon surround ing the spherical profile are calculated, a contour is determined, d) a refe rence circuit is determined in relation to the contour such that i) the quad ratic shape deviation of the contour reaches a minimum in relation to said r eference circuit, ii) said reference circuit represents the smallest possibl e circuit that adapts to the contour, iii) said reference circuit representi ng the largest possible circuit that adapts to the contour, or iv) the refer ence circuit together with an additional circuit that is concentric to the r eference circuit surrounds the contour at a minimal radial distance, e) the diameter (Dref) of the reference circuit is calculated and the reference cen tre (Zp) is determined from the position in the cavity that represents the c entre point of the reference circuit and f) at least two vectors are calcula ted from said reference centre (Zp) to the contour and the ovality is determ ined from said data.
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