| 摘要 |
The invention relates to a method for measuring the sphericity or for measuring the shape deviation of spherical profiles in rolling trains that displace in the longitudinal direction thereof. According to the invention, at least three shadow edges that are adjacent to the spherical profile that is to be measured, that surrounds said spherical profile and that forms a polygon are produced and measured in a known manner, with the aid of a measuring device 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 measurment, a centre (Z0) in the measuring field of the measuring device is calibrated and determined provided that said type of centre (Z0) has not already determined, 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 surrounding the spherical profile are calculated, a contour is determined, d) a reference circuit is determined in relation to the contour such that i) the quadratic shape deviation of the contour reaches a minimum in relation to said reference circuit, ii) said reference circuit represents the smallest possible circuit that adapts to the contour, iii) said reference circuit representing the largest possible circuit that adapts to the contour, or iv) the reference circuit together with an additional circuit that is concentric to the reference circuit surrounds the contour at a minimal radial distance, e) the diameter (Dref) of the reference circuit is calculated and the reference centre (Zp) is determined from the position in the cavity that represents the centre point of the reference circuit and f) at least two vectors are calculated from said reference centre (Zp) to the contour and the ovality is determined from said data. |
