Method for detecting flatness of large-scale flange

Abstract

The invention discloses a method for detecting flatness of a large-scale flange. The method comprises the following steps of: selecting three measurement datum points on a flange plane; erecting a laser transmitter, and determining a laser beam sweeping surface which is parallel to the flange plane to be detected as a measurement referent surface by matching three datum points serving as basis and a laser detector; determining a measurement point, sequentially measuring recorded data point by point; and calculating the flatness of the flange according to the measured data. By the measurement method, the flatness of the processing surface of the large-scale flange at any gesture can be quickly and accurately measured at any time. Laser equipment has a display result which is high in accuracy, and can guarantee the measurement accuracy of the large-scale flange; a detection method is not related to the gesture of the flange plane and the field detection result can be obtained efficiently; and detection does not depend on machining equipment serving as base, the method has independence, and the detection accuracy is not influenced by the machining equipment.

Description

technical field [0001] The invention relates to a method for measuring the flatness of a large plane, in particular to a method for measuring the flatness of a large flange by using a laser. Background technique [0002] Offshore equipment such as large ship cranes and single point mooring devices are designed with a slewing mechanism assembly surface, that is, a large flange surface. The diameter of such large flanges is usually 3-5 meters, the maximum can reach 13 meters, and the flatness requirement reaches 0.08mm, which is generally completed by on-site machining technology. At present, the large-scale flange surface machining business of marine engineering equipment in my country is mainly undertaken by foreign companies. In order to adapt to this type of machining business, foreign companies have developed special mobile machining equipment, which can be assembled at the site of structural parts prefabrication. The device can be dismantled after processing. While this...

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Problems solved by technology

[0003] Usually, the inspection of the processing surface of large flanges relies on the machining equipment itself. The specific plan is: check the circular runout on multiple circumferences of the flange surface with a dial indicator based on the rotation axis of the machining equipment itself; but This method of relying on the machining equipment itself as a benchmark for inspection has certain defects: First, it lacks the independence of inspection. If there are undiscovered problems in the machining equipment itself, the inspection results will be affected and lose accuracy. Moreover, once the machining equipment is dismantled, the flange surface cannot be re-inspected; second, if the flange surface cannot be machined in a horizontal manner due to other factors, there is no effective way to check the flange surface in the radial direction. In addition, the flange surface is inspected by measuring instruments such as a level or a total station, and the inspection result is difficult to be better than 1mm

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