Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1997-11-05
1999-06-01
Noori, Max H.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73828, G01N 308
Patent
active
059089890
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for measuring and correcting the stress profile of an elongated saw blade, in particular for band saws, wherein direction of travel which essentially corresponds to its longitudinal direction; and held down in a start portion and an end portion of same; measuring path in a measuring plane which is orthogonal to its direction of travel; to the direction of travel, coordinated with data of the distance of the measuring points from an edge of the saw blade and data of the longitudinal movement of the saw blade is stored; and the direction of travel in accordance with this data.
The invention further relates to an apparatus for carrying out such a method, comprising saw, is movable in a direction which essentially corresponds to its longitudinal direction; in which at least one sensor is arranged; blade; and zone, respectively, of the measuring station for pressing the saw blade onto the blade supports symmetrically to the measuring plane.
A method and an apparatus of this generic type are known from AT-B-342 385(equivalent of U.S. Pat. No. 3,919,900 to Allen et al.) There, an endless saw blade for a band saw runs over two deflection rollers which are supported in a machine frame so as to be rotatable about a horizontal axis each and limit an area of the machine frame in between which in the following--and also with reference to the present invention--will be designated as the machine table. On the machine table, several stations are arranged in series in the direction of travel of the saw blade which are required for measuring and correcting the stress profile and the curvature of the saw blade back, i.e. a measuring station for sensing the blade back, a measuring station for sensing the stress profile and a rolling station for correcting the stress profile and the curvature of the back of the saw blade.
Here and in the following the term blade back of a single-sided toothed saw blade refers to the edge opposite the toothed edge. This, however, is not be be construed as excluding saw blades with teeth on both sides for band saws and gate saws--also in the context of the present invention; in the case of such saw blades one of the two toothed edges is sensed instead of a smooth edge in order to determine whether and how the saw blade is curved in its plane and whether it deviates from its intended direction of travel.
The measuring station for sensing the blade back of the mentioned known apparatus comprises two skid-type guides which, relative to the direction of travel of the saw blade, are arranged at a distance one behind the other and define a vertical contact plane for the blade back. A sensor is arranged between these two guides which senses the blade back in the plane of the saw blade orthogonally to its direction of travel. On the basis of the data determined in this manner, the radius of curvature can be calculated for any position of the blade back.
Relative to the direction of travel of the saw blade, the measuring station for sensing the stress profile is arranged at a distance behind the measuring station for sensing the blade back, and comprises two formed plates with arc-shaped upper edges which are arranged parallel to the direction of travel of the saw blade in one vertical plane each and support same in one marginal region each, so that they define a measuring path. In a start area and an end area of this measuring path, one pair of poles each is fastened at the machine frame, and a holding-down arm is hinged at the upper end of each pole for pivoting in a vertical longitudinal plane, at the bottom end of which a holding-down roller is supported. The total of four holding-down rollers press the saw blade against the two formed plates in the start and end area of the measuring path. Magnets are arranged along the upper edges of the formed plates, which prevent the saw blade from developing bulges instead of moulding itself in the intended manner to arc-shaped upper edges of the formed plates and to slide along them. The saw blade in this measuring path is thu
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Bailer Norbert
Bailer Peter
Beck Ernst
Lenard Peter
Browning Clifford W.
Noori Max H.
Vollmer Werke Maschinenfabrik GmbH
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